JP7388610B2 - Video encoding method, video decoding method, and terminal - Google Patents

Description

The present invention relates to the field of video encoding and decoding, and particularly relates to a video encoding method, a video decoding method, and a terminal.

The basic principle of video coding and compression is to eliminate redundancy as much as possible by using the correlation between the spatial domain, time domain, and codewords. Block-based hybrid video coding frameworks are relatively popular, where video coding compression is achieved by performing stages of intra-prediction, inter-prediction, transform, quantification, entropy coding, and the like. This is the way to be. Both the Moving Picture Experts Group (MPEG) and High Efficiency Video Coding (HEVC) standards use block-based hybrid video coding frameworks.

During inter prediction, motion information for each image block needs to be determined so as to generate a predictive block for the image block by using a motion compensation process. The motion information includes reference image information and motion vectors.

When determining motion information for a current image block, commonly used methods include merge mode, non-merge mode, and the like. The following stages may be included in merge mode.

1. A candidate motion information list is constructed, where candidate motion information in the list is obtained by inference by using motion information of spatially or temporally neighboring blocks of the current image block.

2. Select one motion information from the candidate motion information list, transfer the index of the motion information in the list, and use the motion information index to identify all the motion information of the current image block.

The merge mode motion vector is obtained by completely duplicating the motion vector of the neighboring block, so that the motion vector of the current image block is not accurate enough.

However, in non-merge mode, the motion information of the current image block may be determined by performing the following steps.

1. Transfer reference image information, where the reference image information includes unidirectional/bidirectional prediction information, one or two reference image lists, and one or two reference image lists corresponding to the one or two reference image lists, respectively. Contains reference image index.

2. A list of candidate motion vector predictors is constructed, where the candidate motion vector predictors in the list are obtained by inference by using motion information of neighboring blocks of the current image block.

3. Selecting a motion vector predictor from a list of candidate motion vector predictors, transferring an index of the motion vector predictor in the list, and using the index of the motion vector predictor to identify a motion vector predictor for the current image block.

4. Transfer the motion vector difference, add the motion vector difference and the motion vector prediction value, and obtain the motion vector of the current image block.

In non-merging mode, the reference picture information, motion vector predictor index, and corresponding motion vector difference need to be transferred, which makes the motion information more accurate. However, a relatively large amount of information is transferred and, as a result, the bit rate is relatively high.

Embodiments of the present invention provide a video encoding method, a video decoding method, and a terminal, which reduce the information that needs to be transferred in the case of the same video quality, thereby saving a certain number of transmission bits. .

A first aspect of embodiments of the present invention discloses a video decoding method, the video decoding method comprising the step of obtaining, from a bitstream, an index of predicted motion information of a current image block in a candidate predicted motion information list. The predicted motion information includes reference image information and a motion vector predicted value, and the candidate predicted motion information in the candidate predicted motion information list is motion information of a block adjacent to the current image block in the time domain or the spatial domain. a step of querying the candidate predicted motion information list based on the index and using the discovered candidate predicted motion information as predicted motion information; determining a correspondence and obtaining a motion vector difference from the bitstream; and adding a motion vector predicted value and a corresponding motion vector difference based on the correspondence to obtain a motion vector of the current image block. Equipped with.

In this implementation, the motion vector prediction of the current image block is corrected by using the motion vector difference, so that the motion vector of the current image block obtained by reconstruction is more accurate. In addition, the motion vector difference is determined more efficiently based on the correspondence between the motion vector difference and the motion vector predictor, thereby saving transmission bits.

In an optional implementation, determining the correspondence between the motion vector difference and the motion vector predictor based on the predicted motion information determines a prediction mode for the current image block based on the reference image information. a step of determining the number of motion vector differences based on the prediction mode; and a step of determining the number of motion vector differences based on the number of motion vector differences and predicted motion information. , determining a correspondence between the motion vector difference and the motion vector predicted value.

In this implementation scheme, the correspondence between the motion vector difference and the motion vector predicted value is determined, and the motion vector predicted value is corrected by using the motion vector difference corresponding to the motion vector predicted value, thereby , the motion vector of the current image block obtained by reconstruction will be more accurate.

In an optional implementation, determining the number of motion vector differences based on the prediction mode includes determining that there is one motion vector difference if the prediction mode is unidirectional prediction; is bidirectional prediction, and the reference picture information includes a picture order count of the reference picture, the step of determining the number of motion vector differences based on the picture order count of the reference picture of the current picture block, or the prediction If the mode is bidirectional prediction, the motion vector is extracted from at least one of the bitstream of the current image block, the slice layer header information of the bitstream, the image layer header information of the bitstream, and the sequence layer header information of the bitstream. The method includes the step of obtaining the number of differences.

The beneficial effects of this implementation method are as follows. The motion vector prediction of the current image block is corrected by using the motion vector difference, so that the motion vector of the current image block obtained by reconstruction is more accurate.

In an optional implementation scheme, determining the number of motion vector differences based on the picture order count of the reference picture of the current image block includes the step of determining the number of motion vector differences based on the picture order count of the first reference picture of the current image block. determining that a motion vector difference exists between the two if the picture order count of the second reference picture of the current image block is greater than the picture order count of the image block and is less than the picture order count of the current image block; or the picture order count of each reference picture of the current image block is greater than the picture order count of the current image block, or the picture order count of each reference picture of the current image block is greater than the picture order count of the current image block. If so, determining that there is one motion vector difference.

The beneficial effects of this implementation scheme are as follows. The motion vector prediction of the current image block is corrected by using the motion vector difference, so that the motion vector of the current image block obtained by reconstruction is more accurate.

In an optional implementation, if the prediction mode is bidirectional prediction, the predicted motion information includes two motion vector predictors, a first motion vector predictor and a second motion vector predictor; The step of determining a correspondence relationship between a motion vector difference and a motion vector predicted value based on the number of differences and predicted motion information includes, when two motion vector differences exist, converting the two motion vector differences into a first separately using the motion vector predicted value of the second motion vector predicted value as the corresponding motion vector difference, or, if one motion vector difference exists, converting the motion vector difference to the first motion vector predicted value. either use the motion vector difference as the corresponding motion vector difference and set the motion vector difference corresponding to the second motion vector predicted value to 0, or use the motion vector difference as the motion vector difference corresponding to the second motion vector predicted value. The motion vector difference corresponding to the first motion vector predicted value is set to 0, or the motion vector difference is set to the motion vector difference corresponding to each of the first motion vector predicted value and the second motion vector predicted value. used as a vector difference, or indicates from the bitstream that the motion vector difference corresponds to a first motion vector prediction, or that the motion vector difference corresponds to a second motion vector prediction. and determining a correspondence between the motion vector difference and the motion vector predicted value based on the obtained information.

The beneficial effects of this implementation scheme are as follows. The motion vector prediction of the current image block is corrected by using the motion vector difference, so that the motion vector of the current image block obtained by reconstruction is more accurate. In addition, the motion vector difference is determined more efficiently based on the correspondence between the motion vector difference and the motion vector predictor, thereby saving transmission bits.

In an optional implementation, the number of candidate predicted motion information in the candidate predicted motion information list is obtained from at least one of slice layer header information, image layer header information, and sequence layer header information of the bitstream.

The beneficial effects of this implementation method are as follows. The motion vector prediction of the current image block is corrected by using the motion vector difference, so that the motion vector of the current image block obtained by reconstruction is more accurate.

In an optional implementation, the number of candidate predicted motion information in the candidate predicted motion information list is smaller than the number of motion information in the merge mode motion information list.

The beneficial effects of this implementation method are as follows. The number of candidate predicted motion information in the candidate predicted motion information list is controlled to reduce computational complexity, thereby increasing decoding speed.

In an optional implementation, the current image block is an arbitrary prediction unit of the current to-be-reconstructed image block corresponding to the bitstream.

The beneficial effects of this implementation scheme are as follows. The motion vector prediction of the current image block is corrected by using the motion vector difference, so that the motion vector of the current image block obtained by reconstruction is more accurate. In addition, the motion vector difference is determined more efficiently based on the correspondence between the motion vector difference and the motion vector predictor, thereby saving transmission bits.

A second aspect of an embodiment of the present invention discloses a video decoding terminal, the video decoding terminal comprising a processor and a memory. The processor obtains an index of predicted motion information of a current image block in a candidate predicted motion information list from a bitstream, the predicted motion information includes reference image information and a motion vector predicted value, and the predicted motion information includes reference image information and a motion vector predicted value; The candidate predicted motion information in the information list is the motion information of adjacent blocks of the current image block in the time domain or the spatial domain. Based on the operation and index, the candidate predicted motion information list is queried and the found candidate predicted motion an operation that uses information as predicted motion information; an operation that determines a correspondence relationship between a motion vector difference and a motion vector predicted value based on the predicted motion information; and an operation that obtains a motion vector difference from a bitstream; , adding the motion vector predicted value and the corresponding motion vector difference to obtain the motion vector of the current image block.

In an optional implementation, the processor determines, based on the predicted motion information, the correspondence between the motion vector difference and the motion vector predictor based on the prediction mode of the current image block, based on the reference image information. a step of determining the number of motion vector differences based on the prediction mode, and a step of determining the number of motion vector differences and predicted motion information based on the prediction mode. and determining a correspondence between the motion vector difference and the motion vector predicted value based on the motion vector difference and the motion vector predicted value.

In an optional implementation, the processor determining the number of motion vector differences based on the prediction mode includes determining that there is one motion vector difference if the prediction mode is unidirectional prediction; or , when the prediction mode is bidirectional prediction and the reference picture information includes a picture order count of the reference picture, determining the number of motion vector differences based on the picture order count of the reference picture of the current picture block; or, if the prediction mode is bidirectional prediction, from at least one of the bitstream of the current image block, slice layer header information of the bitstream, image layer header information of the bitstream, and sequence layer header information of the bitstream. , including obtaining the number of motion vector differences.

In an optional implementation, the processor determines the number of motion vector differences based on a picture order count of a reference picture of the current image block, the processor determining the number of motion vector differences based on a picture order count of a first reference picture of the current image block. If is greater than the picture order count of the current image block, and the picture order count of the second reference picture of the current image block is less than the picture order count of the current image block, it is determined that there is a difference between the two motion vectors. or the picture order count of each reference picture of the current image block is greater than the picture order count of the current image block, or the picture order count of each reference picture of the current image block is greater than the picture order count of the current image block. if less than the ordinal count, determining that one motion vector difference exists;

In an optional implementation, if the prediction mode is bidirectional prediction, the predicted motion information includes two motion vector predictors, a first motion vector predictor and a second motion vector predictor, and the processor Determining the correspondence between a motion vector difference and a motion vector predicted value based on the number of vector differences and predicted motion information means that when two motion vector differences exist, the two motion vector differences are The first motion vector predicted value and the second motion vector predicted value may be used separately as the motion vector difference corresponding to the second motion vector predicted value, or if one motion vector difference exists, the motion vector difference is used as the first motion vector predicted value. or set the motion vector difference corresponding to the second motion vector predicted value to 0, or use the motion vector difference as the motion vector difference corresponding to the second motion vector predicted value. and set the motion vector difference corresponding to the first motion vector predicted value to 0, or set the motion vector difference to the motion corresponding to each of the first motion vector predicted value and the second motion vector predicted value. used as a vector difference, or indicates from the bitstream that the motion vector difference corresponds to a first motion vector prediction, or that the motion vector difference corresponds to a second motion vector prediction. and determining a correspondence between the motion vector difference and the motion vector predicted value based on the obtained information.

In an optional implementation, the number of candidate predicted motion information in the candidate predicted motion information list is obtained from at least one of slice layer header information, image layer header information, and sequence layer header information of the bitstream.

In an optional implementation, the number of candidate predicted motion information in the candidate predicted motion information list is smaller than the number of motion information in the merge mode motion information list.

In an optional implementation, the current image block is an arbitrary prediction unit of the current to-be-reconstructed image block corresponding to the bitstream.

A third aspect of embodiments of the present invention discloses a video decoding terminal, the video decoding terminal being configured to obtain from a bitstream an index of predicted motion information of a current image block in a candidate predicted motion information list. a first acquisition unit in which the predicted motion information includes reference image information and a motion vector predicted value, and the candidate predicted motion information in the candidate predicted motion information list is a first acquisition unit of the current image block in the temporal domain or the spatial domain; a first acquisition unit configured to query a list of candidate predicted motion information based on the index and use the found candidate predicted motion information as predicted motion information; a determining unit configured to determine a correspondence between a motion vector difference and a motion vector predictor based on the motion information; a second obtaining unit configured to obtain a motion vector difference from the bitstream; and a calculation unit configured to add the motion vector prediction value and the corresponding motion vector difference based on the correspondence to obtain the motion vector of the current image block.

In an optional implementation, the determining unit is a first determining subunit configured to determine a prediction mode of the current image block based on the reference image information, the prediction mode being unidirectional prediction or a first determination subunit configured to determine a number of motion vector differences based on a prediction mode, and a second determination subunit configured to determine a number of motion vector differences and predicted motion information; a third determining sub-unit configured to determine a correspondence between the motion vector difference and the motion vector predicted value based on the motion vector prediction value.

In an optional implementation, the second determining sub-unit determines that one motion vector difference exists if the prediction mode is unidirectional prediction, or if the prediction mode is bidirectional prediction, and If the reference picture information includes a picture order count of the reference picture, determine the number of motion vector differences based on the picture order count of the reference picture of the current picture block, or if the prediction mode is bidirectional prediction; The number of motion vector differences is configured to be obtained from at least one of slice layer header information, image layer header information, and sequence layer header information of the bitstream.

In an optional implementation scheme, when determining the number of motion vector differences based on the picture order count of the reference picture of the current image block, the second determining sub-unit selects the first reference picture of the current image block. If the picture order count of the current image block is greater than the picture order count of the current image block, and the picture order count of the second reference picture of the current image block is less than the picture order count of the current image block, then the difference between the two motion vectors exists, or the picture order count of each reference picture of the current picture block is greater than the picture order count of the current picture block, or the picture order count of each reference picture of the current picture block is greater than the picture order count of the current picture block. If it is less than the picture order count of the image block, it is configured to determine that one motion vector difference exists.

In an optional implementation, if the prediction mode is bidirectional prediction, the predicted motion information includes two motion vector predictors, a first motion vector predictor and a second motion vector predictor, and a third motion vector predictor. If there are two motion vector differences, the determining subunit of is configured to separately use the two motion vector differences as a motion vector difference corresponding to a first motion vector predicted value and a second motion vector predicted value; Alternatively, if one motion vector difference exists, use the motion vector difference as the motion vector difference corresponding to the first motion vector prediction value and set the motion vector difference corresponding to the second motion vector prediction value to 0. or use the motion vector difference as the motion vector difference corresponding to the second motion vector predictor and set the motion vector difference corresponding to the first motion vector predictor to 0; or Use the difference as a motion vector difference corresponding to each of the first motion vector predictor and the second motion vector predictor, or use the difference as a motion vector difference corresponding to each of the first motion vector predictor and the second motion vector predictor, or or that the motion vector difference corresponds to a second motion vector prediction.

In an optional implementation, the number of candidate predicted motion information in the candidate predicted motion information list is obtained from at least one of slice layer header information, image layer header information, and sequence layer header information of the bitstream.

In an optional implementation, the number of candidate predicted motion information in the candidate predicted motion information list is smaller than the number of motion information in the merge mode motion information list.

In an optional implementation, the current image block is an arbitrary prediction unit of the current to-be-reconstructed image block corresponding to the bitstream.

A fourth aspect of embodiments of the present invention discloses a video encoding method, the video encoding method comprising: constructing a candidate predicted motion information list for a current image block; The candidate predicted motion information included in the candidate prediction motion information is the motion information of the neighboring blocks of the current image block in the time domain or the spatial domain. a step of selecting one candidate predicted motion information from a predicted motion information list as predicted motion information of the current image block, and determining an index of the selected candidate predicted motion information in the candidate predicted motion information list, the step of: The motion information includes a step of including reference image information and a motion vector predicted value, a step of determining a correspondence between a motion vector difference and a motion vector predicted value based on the predicted motion information, and a step of determining a correspondence between the motion vector difference and the motion vector predicted value based on the predicted motion information. , and encoding the index and the motion vector difference into a bitstream.

In an optional implementation, determining the correspondence between the motion vector difference and the motion vector predictor based on the predicted motion information determines a prediction mode for the current image block based on the reference image information. a step of determining the number of motion vector differences based on the prediction mode; and a step of determining the number of motion vector differences based on the number of motion vector differences and predicted motion information. , determining a correspondence between the motion vector difference and the motion vector predicted value.

In an optional implementation, determining the number of motion vector differences based on the prediction mode includes determining that there is one motion vector difference if the prediction mode is unidirectional prediction; is bidirectional prediction, and the reference picture information includes a picture order count of the reference picture of the current picture block, determine the number of motion vector differences based on the picture order count of the reference picture of the current picture block. When the step or prediction mode is bidirectional prediction, a preset number of motion vector differences is encoded into at least one of slice layer header information, image layer header information, and sequence layer header information of the bitstream. including the stage of

In an optional implementation scheme, determining the number of motion vector differences based on the picture order count of the reference picture of the current image block includes the step of determining the number of motion vector differences based on the picture order count of the first reference picture of the current image block. determining that a motion vector difference exists between the two if the picture order count of the second reference picture of the current image block is greater than the picture order count of the image block and is less than the picture order count of the current image block; or the picture order count of each reference picture of the current image block is greater than the picture order count of the current image block, or the picture order count of each reference picture of the current image block is greater than the picture order count of the current image block. If so, determining that there is one motion vector difference.

In an optional implementation, if the prediction mode is bidirectional prediction, the predicted motion information includes two motion vector predictors, a first motion vector predictor and a second motion vector predictor; The step of determining a correspondence relationship between a motion vector difference and a motion vector predicted value based on the number of differences and predicted motion information includes, when two motion vector differences exist, converting the two motion vector differences into a first separately using the motion vector predicted value of the second motion vector predicted value as the corresponding motion vector difference, or, if one motion vector difference exists, converting the motion vector difference to the first motion vector predicted value. using the motion vector difference as the corresponding motion vector difference and setting the motion vector difference corresponding to the second motion vector predicted value to 0; or using the motion vector difference as the motion vector difference corresponding to the second motion vector predicted value. , the motion vector difference corresponding to the first motion vector predicted value is set to 0, or the motion vector difference is set as the motion vector difference corresponding to each of the first motion vector predicted value and the second motion vector predicted value. determining the correspondence between the motion vector difference and each of the first motion vector predicted value and the second motion vector predicted value based on the preset correspondence; and encoding the relationship into a bitstream.

In an optional implementation, the method sets the number of candidate motion information in the candidate motion information list to at least one of slice layer header information, image layer header information, and sequence layer header information of the bitstream. a step of encoding.

In an optional implementation, the number of candidate predicted motion information in the candidate predicted motion information list is smaller than the number of motion information in the merge mode motion information list.

In an optional implementation, the current image block is an arbitrary prediction unit of the current to-be-encoded image block corresponding to the bitstream.

A fifth aspect of an embodiment of the present invention discloses a video encoding terminal, the video encoding terminal comprising a processor and a memory. The processor is operable to construct a candidate predicted motion information list for a current image block, wherein the candidate predicted motion information included in the candidate predicted motion information list is a motion of a neighboring block of the current image block in a temporal domain or a spatial domain. Select one candidate predicted motion information from the candidate predicted motion information list as the predicted motion information of the current image block based on the operation information and the motion vector of the current image block obtained during motion estimation. , an operation for determining an index of selected candidate predicted motion information in a candidate predicted motion information list, the predicted motion information includes reference image information and a motion vector predicted value, and based on the operation and the predicted motion information, an operation for determining a correspondence between a motion vector difference and a motion vector predicted value; an operation for obtaining a motion vector difference corresponding to a motion vector predicted value based on the correspondence and the motion vector; and an operation of encoding the data into a bitstream.

In an optional implementation scheme, the processor determines the correspondence between the motion vector difference and the motion vector predictor based on the predicted motion information in a prediction mode of the current image block based on the reference image information. The method includes determining a prediction mode including unidirectional prediction or bidirectional prediction, determining the number of motion vector differences based on the prediction mode, and determining motion vector differences based on the number of motion vector differences and predicted motion information. determining a correspondence between the vector difference and the motion vector predictor.

In an optional implementation, the processor determines the number of motion vector differences based on the prediction mode, determining that there is one motion vector difference if the prediction mode is unidirectional prediction; or If the prediction mode is bidirectional prediction and the reference picture information includes the picture order count of the reference picture of the current picture block, calculate the number of motion vector differences based on the picture order count of the reference picture of the current picture block. or, if the prediction mode is bidirectional prediction, a preset number of motion vector differences based on at least one of slice layer header information, image layer header information, and sequence layer header information of the bitstream. including encoding.

In an optional implementation, the processor determines the number of motion vector differences based on a picture order count of a reference picture of the current image block, the processor determining the number of motion vector differences based on a picture order count of a first reference picture of the current image block. If is greater than the picture order count of the current image block, and the picture order count of the second reference picture of the current image block is less than the picture order count of the current image block, it is determined that there is a difference between the two motion vectors. or the picture order count of each reference picture of the current image block is greater than the picture order count of the current image block, or the picture order count of each reference picture of the current image block is greater than the picture order count of the current image block. if less than the ordinal count, determining that one motion vector difference exists;

In an optional implementation, if the prediction mode is bidirectional prediction, the predicted motion information includes two motion vector predictors, a first motion vector predictor and a second motion vector predictor, and the processor , determining the correspondence between the motion vector difference and the motion vector predicted value based on the number of motion vector differences and the predicted motion information means that if there are two motion vector differences, the two motion vector differences are Using motion vector differences corresponding to the first motion vector prediction value and the second motion vector prediction value separately, or, if one motion vector difference exists, using the motion vector difference as the first motion vector prediction value. or use the motion vector difference corresponding to the second motion vector predicted value as the motion vector difference corresponding to the second motion vector predicted value, or set the motion vector difference corresponding to the second motion vector predicted value to 0. and set the motion vector difference corresponding to the first motion vector predicted value to 0, or set the motion vector difference corresponding to each of the first motion vector predicted value and the second motion vector predicted value. or determine a correspondence relationship between the motion vector difference and each of the first motion vector predicted value and the second motion vector predicted value based on a preset correspondence relationship. , including encoding the preset correspondence into a bitstream.

In an optional implementation, the method sets the number of candidate motion information in the candidate motion information list to at least one of slice layer header information, image layer header information, and sequence layer header information of the bitstream. a step of encoding.

In an optional implementation, the number of candidate predicted motion information in the candidate predicted motion information list is smaller than the number of motion information in the merge mode motion information list.

In an optional implementation, the current image block is an arbitrary prediction unit of the current to-be-encoded image block corresponding to the bitstream.

A sixth aspect of embodiments of the present invention discloses a video encoding terminal, the video encoding terminal being a list construction unit configured to construct a candidate predicted motion information list for the current image block. , the candidate predicted motion information included in the candidate predicted motion information list is the motion information of neighboring blocks of the current image block in the time domain or the spatial domain. a selection unit configured to select one candidate predicted motion information from a candidate predicted motion information list as predicted motion information of a current image block based on a motion vector of the block, the predicted motion information being a reference image; a selection unit configured to determine an index of the selected candidate predicted motion information in the list of candidate predicted motion information; a second determining unit configured to determine a correspondence between the vector difference and the motion vector predictor; and a second determining unit configured to determine a correspondence between the vector difference and the motion vector predictor, and to obtain a motion vector difference corresponding to the motion vector predictor based on the correspondence and the motion vector. an acquisition unit configured and a first encoding unit configured to encode the index and the motion vector difference into a bitstream.

In an optional implementation, the second determining unit is a first determining subunit configured to determine a prediction mode of the current image block based on the reference image information, the prediction mode being one-sided. a first determining subunit configured to determine a number of motion vector differences, including directional prediction or bidirectional prediction; and a second determination subunit configured to determine a number of motion vector differences based on a prediction mode; and a second determination subunit configured to determine a number of motion vector differences and a predicted motion. and a third determining subunit configured to determine a correspondence between the motion vector difference and the motion vector prediction based on the information.

In an optional implementation, the second determining sub-unit determines that there is one motion vector difference if the prediction mode is unidirectional prediction, or if the prediction mode is bidirectional prediction and , if the reference picture information includes the picture order count of the reference picture of the current picture block, determine the number of motion vector differences based on the picture order count of the reference picture of the current picture block, or if the prediction mode is both In the case of direction prediction, the predetermined number of motion vector differences is configured to be encoded into at least one of slice layer header information, image layer header information, and sequence layer header information of the bitstream.

In an optional implementation scheme, when determining the number of motion vector differences based on the picture order count of the reference picture of the current image block, the second determining sub-unit selects the first reference picture of the current image block. If the picture order count of the current image block is greater than the picture order count of the current image block, and the picture order count of the second reference picture of the current image block is less than the picture order count of the current image block, then the difference between the two motion vectors exists, or the picture order count of each reference picture in the current image block is greater than the picture order count of the current image block, or the picture order count of each reference picture in the current image block is greater than the picture order count of the current image block. If it is less than the picture order count of the block, it is configured to determine that one motion vector difference exists.

In an optional implementation, if the prediction mode is bidirectional prediction, the predicted motion information includes two motion vector predictors, a first motion vector predictor and a second motion vector predictor, and a third motion vector predictor. If there are two motion vector differences, the determining subunit of determines whether to separately use the two motion vector differences as motion vector differences corresponding to the first motion vector predicted value and the second motion vector predicted value. , or, if there is one motion vector difference, use the motion vector difference as the motion vector difference corresponding to the first motion vector predictor and set the motion vector difference corresponding to the second motion vector predictor to 0. or use the motion vector difference as the motion vector difference corresponding to the second motion vector predictor and set the motion vector difference corresponding to the first motion vector predictor to 0; or The vector difference is used as a motion vector difference corresponding to each of the first motion vector predicted value and the second motion vector predicted value, or the motion vector difference and the first motion vector are used based on a preset correspondence relationship. The apparatus is configured to determine a correspondence between the predicted value and each of the second motion vector predicted values, and to encode the predetermined correspondence into a bitstream.

In an optional implementation, the terminal further sets the number of candidate motion information pieces in the candidate motion information list to at least one of slice layer header information, image layer header information, and sequence layer header information of the bitstream. A second encoding unit configured to encode.

In an optional implementation, the number of candidate predicted motion information in the candidate predicted motion information list is smaller than the number of motion information in the merge mode motion information list.

In an optional implementation, the current image block is an arbitrary prediction unit of the current to-be-encoded image block corresponding to the bitstream.

A seventh aspect of embodiments of the invention discloses a computer storage medium configured to store the computer software instructions used in the first aspect and the fourth aspect, the computer storage medium configured to store computer software instructions used in the first aspect and the fourth aspect. includes programs designed to carry out the aspects described above.

The technical solutions in the second to seventh aspects of the embodiments of the present invention are consistent with the technical solutions in the first aspect of the embodiments of the present invention, and the obtained beneficial effects are similar. It should be understood that Details are not explained here again.

From the above technical solutions, it can be seen that the embodiments of the present invention have the following advantages. In embodiments of the present invention, reference image information of neighboring blocks is obtained and used as reference image information of the current image block. For motion vectors, the motion vectors of neighboring blocks are used to predict the motion vector of the current image block, and the motion vector difference is transferred to correct the motion vector prediction and improve the relatively high accuracy of the motion vector. achieve. In addition, the motion vector difference is determined more efficiently based on the correspondence between the motion vector difference and the motion vector predictor, thereby saving transmission bits. It can be seen that implementing embodiments of the present invention can reduce the information that needs to be transferred in the case of the same video quality, thereby saving certain transmission bits.

In order to more clearly explain the technical solution in the embodiments of the present invention, the accompanying drawings necessary for explaining the embodiments are briefly described below. Obviously, the attached drawings in the following description merely illustrate some embodiments of the invention, and a person skilled in the art can derive other drawings from these attached drawings without any creative effort.

1 is a schematic flowchart of a video decoding method disclosed in an embodiment of the present invention.

1 is a schematic structural diagram of a video decoding terminal disclosed in an embodiment of the present invention.

FIG. 2 is a schematic structural diagram of another video decoding terminal disclosed in an embodiment of the present invention.

1 is a schematic flowchart of a video encoding method disclosed in an embodiment of the present invention.

1 is a schematic structural diagram of a video encoding terminal disclosed in an embodiment of the present invention.

FIG. 2 is a schematic structural diagram of another video encoding terminal disclosed in an embodiment of the present invention.

1 is a schematic structural diagram of a video encoding/decoding apparatus or an electronic device disclosed in an embodiment of the present invention.

1 is a schematic structural diagram of a video encoding/decoding system disclosed in an embodiment of the present invention.

In order to make the objectives, technical solutions, and advantages of the present invention more clear, the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some, but not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

In the specification of the invention, the claims, and the accompanying drawings, the terms "first," "second," and the like are intended to distinguish between different subject matter, but not in any particular order. It is not meant to be shown. Additionally, the terms "comprising" and "having" and any other variations thereof are intended to include non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but optionally further includes unlisted steps or units, or , optionally further comprising other specific steps or units of the process, method, or device.

Embodiments of the present invention provide a video encoding method, a video decoding method, and a terminal, which reduce the information that needs to be transferred in the case of the same video quality, thereby saving a certain number of transmission bits. . Details are explained separately below.

FIG. 1 is a schematic flowchart of a video decoding method disclosed in an embodiment of the present invention. The video decoding method shown in FIG. 1 may include the following steps.

101. Obtain the index of the predicted motion information of the current image block in the candidate predicted motion information list from the bitstream.

In this embodiment of the present invention, the predicted motion information includes reference image information and motion vector predicted values, and the candidate predicted motion information in the candidate predicted motion information list includes the neighboring blocks of the current image block in the time domain or the spatial domain. This is movement information.

In this embodiment of the invention, the current image block may be any prediction unit of the current to-be-reconstructed image block corresponding to the bitstream. In some embodiments of the invention, the current image block may alternatively be any transform unit or decoding unit of the current to-be-reconstructed image block corresponding to the bitstream. This is not a limitation.

The number of pieces of candidate predicted motion information in the candidate predicted motion information list may be obtained from at least one of slice layer header information, image layer header information, and sequence layer header information of the bitstream.

In addition, the number of pieces of candidate predicted motion information in the candidate predicted motion information list is smaller than the number of pieces of motion information in the merge mode motion information list. The merge mode is an inter prediction method of the High Efficiency Video Coding (HEVC) standard. In the merge mode, the motion information of one of the neighboring blocks of the current image block is directly selected from the motion information list to determine the motion information of the current image block, and there is a relatively large number of motion information in the motion information list. do. However, in this embodiment of the invention, the number of candidate predicted motion information in the candidate predicted motion information list is smaller than the number of motion information in the merge mode motion information list, thereby reducing the computational complexity.

102. Based on the index, the candidate predicted motion information list is queried and the discovered candidate predicted motion information is used as predicted motion information.

In general, there is a high probability that the reference image information of adjacent image blocks is completely the same, while the motion vectors of adjacent image blocks are usually slightly different. Therefore, in this embodiment of the invention, the found candidate predicted motion information is used as the predicted motion information, the motion vector difference is also obtained, and the motion vector prediction value included in the predicted motion information is corrected to correct the current image Obtain relatively accurate motion vectors for blocks.

103. Based on the predicted motion information, a correspondence between a motion vector difference and a motion vector predicted value is determined, and the motion vector difference is obtained from the bitstream.

In an optional implementation scheme, the correspondence between the motion vector difference and the motion vector predictor is based on reference image information and the prediction mode of the current image block, including unidirectional prediction or bidirectional prediction. Determine a prediction mode, determine the number of motion vector differences based on the prediction mode, and determine the correspondence between the motion vector difference and the motion vector predicted value based on the number of motion vector differences and predicted motion information. This method can be determined based on the predicted motion information.

In the implementation method of determining the correspondence between motion vector differences and motion vector prediction values, determining the number of motion vector differences based on the prediction mode may be implemented in the following manner. If the prediction mode is unidirectional prediction, it is determined that one motion vector difference exists, or if the prediction mode is bidirectional prediction and the reference picture information includes the picture order count of the reference picture, the current Determine the number of motion vector differences based on the picture order count of the reference picture of the picture block of the current picture block, or the picture order count of the first reference picture of the current picture block is greater than the picture order count of the current picture block. , and the picture order count of the second reference picture of the current image block is smaller than the picture order count of the current image block, then determine that there is a motion vector difference between the two, or One motion vector difference if the picture order count of the reference picture is greater than the picture order count of the current picture block, or if the picture order count of each reference picture of the current picture block is less than the picture order count of the current picture block. exists or the prediction mode is bidirectional prediction, the bitstream of the current image block, the slice layer header information of the bitstream, the image layer header information of the bitstream, and the sequence layer header of the bitstream. The number of motion vector differences is obtained from at least one of the pieces of information.

After the number of motion vector differences is obtained, if the prediction mode is bidirectional prediction, the predicted motion information includes two motion vector predicted values, a first motion vector predicted value and a second motion vector predicted value. , the correspondence between the motion vector difference and the motion vector predicted value may be determined in the following manner. If two motion vector differences exist, the two motion vector differences are used separately as the motion vector differences corresponding to the first motion vector prediction value and the second motion vector prediction value, or one motion vector difference is used as the motion vector difference corresponding to the first motion vector prediction value and the second motion vector prediction value. If a difference exists, use the motion vector difference as the motion vector difference corresponding to the first motion vector predictor and set the motion vector difference corresponding to the second motion vector predictor to 0, or Either use the vector difference as the motion vector difference corresponding to the second motion vector predicted value and set the motion vector difference corresponding to the first motion vector predicted value to 0, or use the motion vector difference as the motion vector difference corresponding to the first motion vector predicted value. Use it as a motion vector difference corresponding to each of the motion vector predicted value and the second motion vector predicted value, or indicate from the bitstream that the motion vector difference corresponds to the first motion vector predicted value. , or obtain information indicating that the motion vector difference corresponds to the second motion vector predicted value, and determine the correspondence between the motion vector difference and the motion vector predicted value based on the obtained information. .

It should be noted that in a possible implementation, the motion vector difference is used as the motion vector difference corresponding to each of the first motion vector predictor and the second motion vector predictor. In other words, motion vector differences are reused. This saves consumption and improves efficiency for encoding motion vector differences.

104. Based on the correspondence, the motion vector prediction value and the corresponding motion vector difference are added to obtain the motion vector of the current image block.

In this embodiment of the invention, the motion vector prediction value and the corresponding motion vector difference are summed, which allows to compensate for the offset of the motion vector prediction value and calculate the motion vector of the current image block relatively accurately. can be restored.

According to the video decoding method illustrated in FIG. You can see that it has quality.

FIG. 2 is a schematic structural diagram of a video decoding terminal disclosed in an embodiment of the present invention. As shown in FIG. 2, the terminal includes a processor 201 and a memory 202. Memory 202 may be configured to store caches needed by processor 201 to perform data processing, and further provide data that is called upon and retrieved by processor 201 to perform data processing. It may be configured to provide storage space for result data.

In this embodiment of the invention, the processor 201 performs an operation for obtaining the index of predicted motion information of the current image block in the candidate predicted motion information list from the bitstream by invoking a program code stored in the memory 202. The predicted motion information includes reference image information and a motion vector predicted value, and the candidate predicted motion information in the candidate predicted motion information list is motion information of a block adjacent to the current image block in the time domain or the spatial domain. , an operation that queries a candidate predicted motion information list based on the index and uses the discovered candidate predicted motion information as predicted motion information; and an operation that uses the detected candidate predicted motion information as predicted motion information; an operation that determines the correspondence between and obtains the motion vector difference from the bitstream, and adds the motion vector predicted value and the corresponding motion vector difference based on the correspondence to obtain the motion vector of the current image block. and configured to perform the operations.

According to the video decoding terminal illustrated in FIG. Has quality.

FIG. 3 is a schematic structural diagram of another video decoding terminal disclosed in the embodiment of the present invention. As shown in FIG. 3, the terminal includes a first acquisition unit 301 configured to obtain, from the bitstream, an index of predicted motion information of the current image block in the candidate predicted motion information list; The predicted motion information includes reference image information and a motion vector predicted value, and the candidate predicted motion information in the candidate predicted motion information list is motion information of a block adjacent to the current image block in the time domain or the spatial domain. an acquisition unit 301; a query unit 302 configured to query a candidate predicted motion information list based on the index and use the found candidate predicted motion information as predicted motion information; a determination unit 303 configured to determine a correspondence between a motion vector predicted value and a second acquisition unit 304 configured to obtain a motion vector difference from a bitstream; and a calculation unit 305 configured to add the vector prediction value and the corresponding motion vector difference to obtain the motion vector of the current image block.

According to the video decoding terminal illustrated in FIG. Has quality.

FIG. 4 is a schematic flowchart of a video encoding method disclosed in an embodiment of the present invention. The video encoding method shown in FIG. 4 may include the following steps.

401. A candidate predicted motion information list of a current image block is constructed, where the candidate predicted motion information included in the candidate predicted motion information list is motion information of neighboring blocks of the current image block in a time domain or a spatial domain.

In this embodiment of the invention, the current image block is any prediction unit of the current to-be-coded image block corresponding to the bitstream. In some embodiments of the invention, the current image block may alternatively be any transform unit or decoding unit of the current to-be-encoded image block corresponding to the bitstream. This is not a limitation.

In an optional implementation, the number of candidate predicted motion information in the candidate predicted motion information list is encoded in at least one of slice layer header information, image layer header information, and sequence layer header information of the bitstream. good.

In addition, the number of pieces of candidate predicted motion information in the candidate predicted motion information list is smaller than the number of pieces of motion information in the merge mode motion information list. Merge mode is an inter prediction method in the High Efficiency Video Coding (HEVC) standard. In the merge mode, the motion information of one of the neighboring blocks of the current image block is directly selected from the motion information list to determine the motion information of the current image block, and there is a relatively large number of motion information in the motion information list. do. However, in this embodiment of the invention, the number of candidate predicted motion information in the candidate predicted motion information list is smaller than the number of motion information in the merge mode motion information list, thereby reducing the computational complexity.

402. Based on the motion vector of the current image block obtained during motion estimation, one candidate predicted motion information is selected from the candidate predicted motion information list as the predicted motion information of the current image block, and , determining an index of the selected candidate predicted motion information, where the predicted motion information includes reference image information and a motion vector predicted value.

In this embodiment of the invention, motion estimation is performed on the current image block by using motion information of neighboring blocks. In an optional implementation, positions of multiple motion vectors are obtained during motion estimation, and the motion vector with the lowest rate-distortion cost is selected as the motion vector of the current image block.

In a possible implementation, the candidate predicted motion information in the candidate predicted motion information list is scanned, and each candidate predicted motion information is used as the predicted motion information of the current image block to calculate the rate-distortion cost, thereby determining the minimum One candidate predicted motion information with rate-distortion cost is selected as the predicted motion information of the current image block.

403. Based on the predicted motion information, a correspondence relationship between the motion vector difference and the motion vector predicted value is determined.

In this embodiment of the invention, the correspondence between the motion vector difference and the motion vector prediction value may be determined in the following manner. Based on the reference image information, determine the prediction mode of the current image block that includes unidirectional prediction or bidirectional prediction, determine the number of motion vector differences based on the prediction mode, and determine the number of motion vector differences. Based on the number and predicted motion information, a correspondence relationship between the motion vector difference and the motion vector predicted value is determined.

Determining the number of motion vector differences based on the prediction mode may be achieved in the following manner. If the prediction mode is unidirectional prediction, it is determined that there is one motion vector difference, or if the prediction mode is bidirectional prediction and the reference picture information is the picture order count of the reference picture of the current picture block. , the number of motion vector differences is determined based on the picture order count of the reference picture of the current picture block, or the picture order count of the first reference picture of the current picture block is based on the picture order count of the reference picture of the current picture block. If the picture order count of the second reference picture of the current image block is greater than the picture order count and the picture order count of the second reference picture of the current image block is less than the picture order count of the current image block, then determine that there is a difference between the two motion vectors, or If the picture order count of each reference picture of the image block is greater than the picture order count of the current image block, or the picture order count of each reference picture of the current image block is less than the picture order count of the current image block, If it is determined that one motion vector difference exists, or if the prediction mode is bidirectional prediction, a preset number of motion vector differences is added to the bitstream of the current image block, slice layer header information of the bitstream. , image layer header information of the bitstream, and sequence layer header information of the bitstream.

After the number of motion vector differences is determined, the correspondence between the motion vector differences and the motion vector prediction values may be determined in the following manner. If two motion vector differences exist, the two motion vector differences are used separately as motion vector differences corresponding to the first motion vector prediction value and the second motion vector prediction value, or one motion vector difference is used as the motion vector difference corresponding to the first motion vector prediction value and the second motion vector prediction value. If a vector difference exists, use the motion vector difference as the motion vector difference corresponding to the first motion vector predictor and set the motion vector difference corresponding to the second motion vector predictor to zero, or; The motion vector difference corresponding to the second motion vector predicted value is used to set the motion vector difference corresponding to the first motion vector predicted value to 0, or the motion vector difference is set to 0 using the motion vector difference corresponding to the second motion vector predicted value. The motion vector predicted value and the second motion vector predicted value may be used as a motion vector difference corresponding to each of the predicted motion vector values, or the motion vector difference, the first motion vector predicted value, and the second motion vector predicted value may be A correspondence relationship between each of the two motion vector predicted values is determined, and the preset correspondence relationship is encoded into a bitstream.

It should be noted that in a possible implementation, the motion vector difference is used as the motion vector difference corresponding to each of the first motion vector predictor and the second motion vector predictor. In other words, motion vector differences are reused. This saves consumption and improves efficiency for encoding motion vector differences.

404. Based on the correspondence and the motion vector, a motion vector difference corresponding to the motion vector predicted value is obtained.

The motion vector of the current image block is determined in step 402, and thus a motion vector difference corresponding to the motion vector prediction value can be obtained by subtracting the motion vector prediction value from the motion vector of the current image block.

405. Encode the index and motion vector difference into a bitstream.

It can be seen that according to the video encoding method described in FIG. 4, only the index and motion vector difference need to be transmitted in the bitstream, and the motion information of the current image block can be restored on the decoding side. Therefore, in the case of the same video quality, a certain bit rate can be saved by using this method.

FIG. 5 is a schematic structural diagram of a video encoding terminal disclosed in an embodiment of the present invention. As shown in FIG. 5, the terminal includes a processor 501 and a memory 502. Memory 502 may be configured to store caches needed by processor 501 to perform data processing, and further provides data that is called upon and retrieved by processor 501 to perform data processing. It may be configured to provide storage space for result data.

In this embodiment of the invention, processor 501 performs an operation for constructing a list of candidate predicted motion information for a current image block by invoking program code stored in memory 502. The candidate prediction motion information included is the motion information of the neighboring blocks of the current image block in the time domain or the spatial domain. An operation of selecting one candidate predicted motion information from a motion information list as the predicted motion information of the current image block, and determining an index of the selected candidate predicted motion information in the candidate predicted motion information list, the operation comprising: The information includes an operation that includes reference image information and a motion vector predicted value, an operation that determines a correspondence between a motion vector difference and a motion vector predicted value based on the predicted motion information, and a correspondence and a motion vector. the motion vector difference corresponding to the motion vector predictor; and the operation of encoding the index and the motion vector difference into a bitstream.

According to the video encoding terminal illustrated in FIG. 5, it is necessary to transmit only the index and the motion vector difference in the bitstream, and it is understood that the motion information of the current image block can be restored on the decoding side. Therefore, in the case of the same video quality, a certain bit rate can be saved by using this terminal.

FIG. 6 is a schematic structural diagram of another video encoding terminal disclosed in an embodiment of the present invention. As shown in FIG. 6, the terminal includes a list construction unit 601 configured to construct a list of candidate predicted motion information for the current image block, the terminal comprising: a list of candidate predicted motion information included in the list of candidate predicted motion information; is the motion information of the neighboring blocks of the current image block in the time domain or the spatial domain.The list construction unit 601 constructs a candidate predicted motion information list based on the motion vectors of the current image block obtained during motion estimation. a selection unit 602 configured to select one candidate predicted motion information from the selection unit 602 as the predicted motion information of the current image block, the predicted motion information comprising reference image information and a motion vector prediction value; 602 , a first determining unit 603 configured to determine the index of the selected candidate predicted motion information in the candidate predicted motion information list; a second determining unit 604 configured to determine a correspondence between the motion vectors, and an obtaining unit 605 configured to obtain a motion vector difference corresponding to the motion vector prediction based on the correspondence and the motion vector; a first encoding unit 606 configured to encode the index and the motion vector difference into a bitstream.

According to the video encoding terminal illustrated in FIG. 6, it is necessary to transmit only the index and the motion vector difference in the bitstream, and it is understood that the motion information of the current image block can be restored on the decoding side. Therefore, in the case of the same video quality, a certain bit rate can be saved by using this terminal.

FIG. 7 is a schematic structural diagram of a video encoding/decoding apparatus or electronic device 50 disclosed in an embodiment of the present invention. The apparatus or electronic device may be incorporated into a codec in an embodiment of the invention. Details are explained below.

Electronic device 50 may be, for example, a mobile terminal or user equipment in a wireless communication system. It should be understood that embodiments of the invention can be implemented on any electronic device or apparatus that encodes and decodes or may be required to encode or decode video images. .

The device 50 may include a housing 30 incorporated into the device that is used to protect the device. The device 50 may further include a display 32 in the form of a liquid crystal display. In other embodiments of the invention, the display may be any suitable display suitable for displaying images or video. Device 50 may further include a keypad 34. In other embodiments of the invention, any suitable data or user interface mechanism may be used. For example, a user interface may be implemented as a virtual keyboard, or a data entry system may be implemented as part of a touch-sensitive display. The device may be equipped with a microphone 36 or any suitable audio input, which may be a digital or analog signal input. The device 50 may further include the following audio output devices. The audio output device in this embodiment of the invention may be either an earphone 38, a speaker, an analog audio output connection, or a digital audio output connection. Device 50 may also include a battery 40. In other embodiments of the invention, the device may be powered by any suitable mobile energy device, such as a solar cell, a fuel cell, or a clock generator. The device may further include an infrared port 42 used for close range line-of-sight communication with another device. In other embodiments, device 50 may further include any suitable short-range communication solution, such as a Bluetooth® wireless connection or a USB wired connection.

Device 50 may include a controller 56 or processor configured to control device 50. Controller 56 may be connected to memory 58 . The memory in this embodiment of the invention may store image data or audio data and/or store instructions to be executed on controller 56. Controller 56 may further be connected with a codec circuit 54 suitable for implementing audio and/or video data encoding and decoding or for auxiliary encoding and decoding implemented by controller 56 .

The device 50 further comprises a smart card 46 and a card reader 48 configured to provide user information and suitable for providing authentication information used for network authentication and user authorization, such as a UICC and a UICC reader. good.

Device 50 may further include a wireless interface circuit 52. The wireless interface circuit is connected to the controller and is suitable for generating wireless communication signals used for communicating with, for example, a cellular communication network, a wireless communication system, or a wireless local area network. Device 50 may further include an antenna 44. The antenna is connected to the radio interface circuit 52 to transmit radio frequency signals generated in the radio interface circuit 52 to another device (or devices) and to receive radio frequency signals from another device (or devices). configured to receive.

In some embodiments of the invention, device 50 comprises a camera capable of recording or detecting single frames, and codec 54 or controller receives and processes these single frames. In some embodiments of the invention, the apparatus may receive video image data to be processed from another device prior to transmission and/or storage. In some embodiments of the invention, device 50 may receive images via a wireless or wired connection and encode/decode the images.

In this embodiment of the invention, codec 54 may be configured to perform the video decoding method described in FIG. 1 or the video encoding method described in FIG. 4.

FIG. 8 is a schematic structural diagram of a video encoding/decoding system disclosed in an embodiment of the present invention. As shown in FIG. 8, video encoding/decoding system 10 includes a source device 12 and a destination device 14. Source device 12 generates encoded video data. Accordingly, source device 12 may be referred to as a video encoding device or a video encoding device. Destination device 14 may decode encoded video data generated by source device 12 . Accordingly, destination device 14 may be referred to as a video decoding device or a video decoding device. Source device 12 and destination device 14 may be instances of video encoding/decoding equipment or video encoding/decoding devices. Source device 12 and destination device 14 may include a wide range of devices, including desktop computers, mobile computing devices, notebook (e.g., laptop) computers, tablet computers, set-top boxes, handheld computers such as smartphones, televisions, including cameras, displays, digital media players, video game consoles, in-vehicle computers, or the like.

Destination device 14 may receive encoded video data from source device 12 via channel 16 . Channel 16 may include one or more media and/or devices that can move encoded video data from source device 12 to destination device 14. In illustrative examples, channel 16 may include one or more communication media that enable source device 12 to transmit encoded video data directly to destination device 14 in real time. In this example, source device 12 may modulate encoded video data according to a communication standard (eg, a wireless communication protocol) and transmit the modulated video data to destination device 14. The one or more communication media may include wireless and/or wired communication media, such as, for example, the radio frequency (RF) spectrum or one or more physical transmission lines. The one or more communication media may constitute part of a packet-based network (such as a local area network, wide area network, or global network (eg, the Internet)). The one or more communication media may include a router, switch, base station, or other device that facilitates communication between source device 12 and destination device 14.

In another example, channel 16 may include a storage medium that stores encoded video data generated by source device 12. In this example, destination device 14 may access the storage medium via disk access or card access. The storage medium may include a plurality of locally accessible data storage media, such as a Blu-ray, DVD, CD-ROM, flash memory, or another suitable digital storage medium configured to store encoded video data. may be included.

In another example, channel 16 may include a file server or another intermediate storage device that stores encoded video data generated by source device 12. In this example, destination device 14 may access encoded video data stored on a file server or another intermediate storage device by streaming transmission or downloading. The file server may be a type of server that can store encoded video data and transmit the encoded video data to destination device 14 . File servers in examples include web servers (eg, used for websites), file transfer protocol (FTP) servers, network attached storage (NAS) devices, and local disk drives.

Destination device 14 may access the encoded video data via a standard data connection (eg, an Internet connection). Illustrative types of data connections include wireless channels (e.g., Wi-Fi connections) or wired connections (e.g., DSL connections) suitable for accessing encoded video data stored on the file server. or cable modem), or a combination thereof. The encoded video data may be transmitted from the file server by streaming transmission, download transmission, or a combination thereof.

The techniques of the present invention are not limited to wireless application scenarios. For example, techniques include terrestrial television broadcasting, over-the-air television transmission, satellite television transmission, streaming video transmission (e.g., over the Internet), encoding of video data stored on a data storage medium, and encoding of video data stored on a data storage medium. The present invention may be applied to video encoding and decoding in multiple multimedia applications that support other applications. In some instances, video encoding/decoding system 10 supports unidirectional or bidirectional video transmission to support streaming video transmission, video playback, video broadcasting, and/or video calling, and other applications. It may be configured as follows.

In the example of FIG. 8, source device 12 includes a video source 18, a video encoder 20, and an output interface 22. In some examples, output interface 22 may include a modulator/demodulator (modem) and/or a transmitter. Video source 18 may include a video capture device (e.g., a video camera), a video archive containing previously captured video data, a video input interface configured to receive video data from a video content provider, and/or generate video data. or a combination of the video data sources described above.

Video encoder 20 may encode video data from video source 18 . In some instances, source device 12 transmits encoded video data directly to destination device 14 by using output interface 22 . The encoded video data may alternatively be stored on a storage medium or on a file server so that destination device 14 can later access the encoded video data and retrieve the encoded video data. Decrypt and/or regenerate data.

In the example of FIG. 8, destination device 14 includes an input interface 28, a video decoder 30, and a display device 32. In the example of FIG. In some instances, input interface 28 includes a receiver and/or modem. Input interface 28 may receive encoded video data via channel 16 . Display device 32 may be integrated with destination device 14 or may be external to destination device 14 . Display device 32 typically displays decoded video data. Display device 32 may include multiple types of display devices, such as a liquid crystal display (LCD), a plasma display, an organic light emitting diode (OLED) display, or another type of display device.

Video encoder 20 and video decoder 30 may perform operations in accordance with a video compression standard (eg, the High Efficiency Video Coding H.265 standard) and may be compliant with the HEVC Test Model (HM). H. Textual description of the ITU-TH.265 standard. 265 (V3) (04/2015) was released on April 29, 2015 and is available at http://handle. itu. int//11.1002/1000/12455, and all contents of the document are incorporated by reference in their entirety.

Alternatively, video encoder 20 and video decoder 30 may perform operations according to other proprietary or industry standards. The standard is ITU-TH. 261, ISO/IECMPEG-1Visual, ITU-TH. 262, or ISO/IECMPEG-2Visual, ITU-TH. H.263, ISO/IECMPEG-4Visual, and ITU-TH. 264 (also known as ISO/IEC MPEG-4AVC). It should be understood that the techniques of the present invention are not limited to any particular encoding/decoding standard or technique.

In addition, FIG. 8 is illustrative only, and the techniques of the present invention may be used in video encoding/decoding applications (e.g., one-sided video coding) that do not necessarily involve any data communication between the encoding device and the decoding device. or one-sided video decoding). In other instances, the data is retrieved from local memory, the data is transmitted via streaming by using a network, or the data is operated on in a similar manner. An encoding device may encode data and store the data in memory, and/or a decoding device may retrieve data from memory and decode the data. In many instances, encoding and decoding is performed by multiple devices that simply encode data into memory and/or simply retrieve data from memory and decode data without communicating with each other.

Video encoder 20 and video decoder 30 each include, for example, one or more microprocessors, digital signal processors (DSPs), application specific integrated circuits (ASICs), field programmable gate arrays (FPGAs), discrete logic circuits, hardware , or any combination thereof. If the techniques are partially or fully implemented using software, the apparatus may store the software instructions on a suitable non-transitory computer-readable storage medium and the one or more processors may implement the present invention. can be used to execute instructions in hardware to perform the techniques of Any one of the foregoing (including hardware, software, combinations of hardware and software, and the like) may be considered one or more processors. Video encoder 20 and video decoder 30 may each be included in one or more encoders or decoders, and each may be integrated as part of a combined encoder/decoder (CODEC) of another device. .

The present invention may generally refer to video encoder 20 "signaling" information to another device (eg, video decoder 30) by using signals. The expression "signaling" generally indicates a syntax element and/or may represent the transfer of encoded video data. Transfer may occur in real time or near real time. Alternatively, the communication may occur over a period of time, such as when the syntax element is stored on a computer-readable storage medium during encoding, by using binary data obtained after encoding. It is possible. The decoding device may retrieve the syntax element at any time after the syntax element is stored on the medium.
(Example 1)
obtaining an index of predicted motion information of a current image block in a candidate predicted motion information list from a bitstream, the predicted motion information including reference image information and a motion vector predicted value; the candidate predicted motion information in the list is motion information of neighboring blocks of the current image block in the temporal or spatial domain;
querying the candidate predicted motion information list based on the index and using the found candidate predicted motion information as the predicted motion information;
determining a correspondence between a motion vector difference and the motion vector predicted value based on the predicted motion information, and obtaining the motion vector difference from the bitstream;
and adding the motion vector predicted value and the corresponding motion vector difference based on the correspondence relationship to obtain a motion vector of the current image block.
(Example 2)
The step of determining a correspondence between a motion vector difference and the motion vector predicted value based on the predicted motion information includes:
determining a prediction mode for the current image block based on the reference image information, the prediction mode including unidirectional prediction or bidirectional prediction;
determining the number of motion vector differences based on the prediction mode;
determining the correspondence between the motion vector difference and the motion vector predicted value based on the number of motion vector differences and the predicted motion information;
Video decoding method described in Example 1.
(Example 3)
The step of determining the number of motion vector differences based on the prediction mode includes:
if the prediction mode is the unidirectional prediction, determining that one motion vector difference exists; or
If the prediction mode is the bidirectional prediction and the reference picture information includes a picture order count of the reference picture, the motion vector difference is determined based on the picture order count of the reference picture of the current picture block. A stage of determining the number of pieces, or
If the prediction mode is the bidirectional prediction, the bitstream of the current image block, slice layer header information of the bitstream, image layer header information of the bitstream, and sequence layer header information of the bitstream. obtaining the number of motion vector differences from at least one of the motion vector differences;
Video decoding method described in Example 2.
(Example 4)
The step of determining the number of motion vector differences based on the picture order count of the reference picture of the current image block comprises:
The picture order count of a first reference picture of the current image block is greater than the picture order count of the current image block, and the picture order count of a second reference picture of the current image block is greater than the picture order count of the current image block. determining that there is a difference between the two motion vectors if the picture order count of the block is less than the picture order count; or
The picture order count of each reference picture of the current picture block is greater than the picture order count of the current picture block, or the picture order count of each reference picture of the current picture block is equal to the picture order of the current picture block. determining that there is a motion vector difference of one if the count is less than the count;
Video decoding method described in Example 3.
(Example 5)
When the prediction mode is the bidirectional prediction, the predicted motion information includes two motion vector predicted values, a first motion vector predicted value and a second motion vector predicted value, and the number of motion vector differences and the second motion vector predicted value. The step of determining the correspondence between the motion vector difference and the motion vector predicted value based on the predicted motion information includes:
If two motion vector differences exist, separately using the two motion vector differences as motion vector differences corresponding to the first motion vector prediction value and the second motion vector prediction value, or
If one motion vector difference exists, the motion vector difference is used as the motion vector difference corresponding to the first motion vector prediction value, and the motion vector difference corresponding to the second motion vector prediction value is set to zero. or use the motion vector difference as a motion vector difference corresponding to the second motion vector predicted value and set the motion vector difference corresponding to the first motion vector predicted value to 0; Alternatively, the motion vector difference is used as a motion vector difference corresponding to each of the first motion vector predicted value and the second motion vector predicted value, or 1, or information indicating that the motion vector difference corresponds to the second motion vector predicted value, and based on the acquired information; , determining a correspondence between the motion vector difference and the motion vector predicted value;
The video decoding method according to any one of Examples 2 to 4.
(Example 6)
The number of candidate predicted motion information items in the candidate predicted motion information list is obtained from at least one of the slice layer header information, the image layer header information, and the sequence layer header information of the bitstream.
The video decoding method according to any one of Examples 1 to 5.
(Example 7)
The number of pieces of candidate predicted motion information in the candidate predicted motion information list is smaller than the number of pieces of motion information in the merge mode motion information list.
The video decoding method according to any one of Examples 1 to 6.
(Example 8)
the current image block is an arbitrary prediction unit of the current image block to be reconstructed corresponding to the bitstream;
The video decoding method according to any one of Examples 1 to 7.
(Example 9)
a first acquisition unit configured to obtain, from a bitstream, an index of predicted motion information of a current image block in a candidate predicted motion information list, the predicted motion information comprising reference image information and a motion vector predicted value; a first acquisition unit, wherein the candidate predicted motion information in the candidate predicted motion information list is motion information of neighboring blocks of the current image block in the temporal domain or the spatial domain;
a query unit configured to query the candidate predicted motion information list based on the index and use the found candidate predicted motion information as the predicted motion information;
a determining unit configured to determine, based on the predicted motion information, a correspondence between a motion vector difference and the motion vector predicted value;
a second acquisition unit configured to acquire the motion vector difference from the bitstream;
and a calculation unit configured to add the motion vector predicted value and the corresponding motion vector difference based on the correspondence relationship to obtain a motion vector of the current image block.
(Example 10)
The determining unit is
a first determining sub-unit configured to determine a prediction mode of the current image block based on the reference image information, the prediction mode comprising a first prediction mode comprising unidirectional prediction or bidirectional prediction; a decision subunit;
a second determining subunit configured to determine the number of motion vector differences based on the prediction mode;
a third determining sub-unit configured to determine the correspondence between the motion vector differences and the motion vector predictions based on the number of motion vector differences and the predicted motion information;
The video decoding terminal described in Example 9.
(Example 11)
Specifically, the second determining subunit:
If the prediction mode is the unidirectional prediction, determining that there is one motion vector difference, or
If the prediction mode is the bidirectional prediction and the reference picture information includes a picture order count of the reference picture, the motion vector difference is determined based on the picture order count of the reference picture of the current picture block. Decide on the number or
If the prediction mode is the bidirectional prediction, the bitstream of the current image block, slice layer header information of the bitstream, image layer header information of the bitstream, and sequence layer header information of the bitstream. configured to obtain the number of motion vector differences from at least one of the motion vector differences;
The video decoding terminal described in Example 10.
(Example 12)
When determining the number of motion vector differences based on the picture order count of the reference picture of the current image block, the second determining sub-unit specifically:
The picture order count of a first reference picture of the current image block is greater than the picture order count of the current image block, and the picture order count of a second reference picture of the current image block is greater than the picture order count of the current image block. determining that a two motion vector difference exists if the picture order count of each reference picture of the current image block is smaller than the picture order count of the current image block; or configured to determine that one motion vector difference exists if the picture order count of each reference picture of the current image block is less than the picture order count of the current image block;
The video decoding terminal described in Example 11.
(Example 13)
When the prediction mode is the bidirectional prediction, the predicted motion information includes two motion vector predicted values, a first motion vector predicted value and a second motion vector predicted value, and the third determination subunit Specifically,
If two motion vector differences exist, the two motion vector differences are used separately as motion vector differences corresponding to the first motion vector prediction value and the second motion vector prediction value, or
If one motion vector difference exists, the motion vector difference is used as the motion vector difference corresponding to the first motion vector prediction value, and the motion vector difference corresponding to the second motion vector prediction value is set to 0. or use the motion vector difference as a motion vector difference corresponding to the second motion vector predicted value and set the motion vector difference corresponding to the first motion vector predicted value to 0; Alternatively, the motion vector difference is used as a motion vector difference corresponding to each of the first motion vector predicted value and the second motion vector predicted value, or the motion vector difference is calculated from the bitstream. The obtained information indicates that the motion vector difference corresponds to the first motion vector predicted value, or that the motion vector difference corresponds to the second motion vector predicted value. configured to determine a correspondence between the motion vector difference and the motion vector predicted value based on
The video decoding terminal according to any one of Examples 10 to 12.
(Example 14)
The number of candidate predicted motion information items in the candidate predicted motion information list is obtained from at least one of the slice layer header information, the image layer header information, and the sequence layer header information of the bitstream.
The video decoding terminal according to any one of Examples 9 to 13.
(Example 15)
The number of pieces of candidate predicted motion information in the candidate predicted motion information list is smaller than the number of pieces of motion information in the merge mode motion information list.
The video decoding terminal according to any one of Examples 9 to 14.
(Example 16)
the current image block is an arbitrary prediction unit of the current image block to be reconstructed corresponding to the bitstream;
The video decoding terminal according to any one of Examples 9 to 15.
(Example 17)
constructing a candidate predicted motion information list for a current image block, said candidate predicted motion information list including candidate predicted motion information, said candidate predicted motion information for said current image block in a temporal domain or a spatial domain; a step comprising motion information of neighboring blocks of the block;
Based on the motion vector of the current image block obtained during motion estimation, one candidate predicted motion information is selected from the candidate predicted motion information list as the predicted motion information of the current image block, and the candidate prediction is determining an index of the selected candidate predicted motion information in a motion information list, the predicted motion information including reference image information and a motion vector predicted value;
determining a correspondence between a motion vector difference and the motion vector predicted value based on the predicted motion information;
obtaining a motion vector difference corresponding to the motion vector predicted value based on the correspondence relationship and the motion vector;
and encoding the index and the motion vector difference into a bitstream.
(Example 18)
The step of determining a correspondence between a motion vector difference and the motion vector predicted value based on the predicted motion information includes:
determining a prediction mode for the current image block based on the reference image information, the prediction mode including unidirectional prediction or bidirectional prediction;
determining the number of motion vector differences based on the prediction mode;
determining the correspondence between the motion vector difference and the motion vector predicted value based on the number of motion vector differences and the predicted motion information;
The video encoding method described in Example 17.
(Example 19)
The step of determining the number of motion vector differences based on the prediction mode includes:
if the prediction mode is the unidirectional prediction, determining that one motion vector difference exists; or
If the prediction mode is the bidirectional prediction and the reference picture information includes a picture order count of the reference picture of the current picture block, based on the picture order count of the reference picture of the current picture block. , determining the number of motion vector differences, or
When the prediction mode is the bidirectional prediction, the preset number of motion vector differences is calculated from the bitstream of the current image block, slice layer header information of the bitstream, and image layer header information of the bitstream. , and encoding at least one of sequence layer header information of the bitstream.
The video encoding method described in Example 18.
(Example 20)
The step of determining the number of motion vector differences based on the picture order count of the reference picture of the current image block comprises:
The picture order count of a first reference picture of the current image block is greater than the picture order count of the current image block, and the picture order count of a second reference picture of the current image block is greater than the picture order count of the current image block. determining that a two motion vector difference exists if the picture order count of each reference picture of the current image block is smaller than the picture order count of the current image block; or determining that a motion vector difference exists if the picture order count of each reference picture of the current image block is less than the picture order count of the current image block;
The video encoding method described in Example 19.
(Example 21)
When the prediction mode is the bidirectional prediction, the predicted motion information includes two motion vector predicted values, a first motion vector predicted value and a second motion vector predicted value, and the number of motion vector differences and the second motion vector predicted value. The step of determining the correspondence between the motion vector difference and the motion vector predicted value based on the predicted motion information includes:
If two motion vector differences exist, separately using the two motion vector differences as motion vector differences corresponding to the first motion vector prediction value and the second motion vector prediction value, or
If one motion vector difference exists, the motion vector difference is used as the motion vector difference corresponding to the first motion vector prediction value, and the motion vector difference corresponding to the second motion vector prediction value is set to zero. or use the motion vector difference as a motion vector difference corresponding to the second motion vector predicted value and set the motion vector difference corresponding to the first motion vector predicted value to 0; Alternatively, the motion vector difference is used as a motion vector difference corresponding to each of the first motion vector predicted value and the second motion vector predicted value, or the motion vector difference is used based on a preset correspondence relationship. determining a correspondence between a vector difference and each of the first motion vector predictor and the second motion vector predictor, and encoding the predetermined correspondence into the bitstream; include,
The video encoding method according to any one of Examples 18 to 20.
(Example 22)
An example comprising: encoding the number of pieces of candidate predicted motion information in the candidate predicted motion information list into at least one of the slice layer header information, the image layer header information, and the sequence layer header information of the bitstream. 22. The video encoding method according to any one of 19 to 21.
(Example 23)
The number of pieces of candidate predicted motion information in the candidate predicted motion information list is smaller than the number of pieces of motion information in the merge mode motion information list.
The video encoding method described in Example 22.
(Example 24)
the current image block is an arbitrary prediction unit of the current image block to be encoded corresponding to the bitstream;
The video encoding method according to any one of Examples 17 to 23.
(Example 25)
A list construction unit configured to construct a candidate predicted motion information list for a current image block, wherein the candidate predicted motion information list includes candidate predicted motion information, and the candidate predicted motion information is arranged in a temporal domain or in a spatial domain. a list construction unit comprising motion information of neighboring blocks of the current image block in a region;
Based on the motion vector of the current image block obtained during motion estimation, one candidate predicted motion information is configured to be selected from the list of candidate predicted motion information as the predicted motion information of the current image block. a selection unit, wherein the predicted motion information includes reference image information and a motion vector predicted value;
a first determining unit configured to determine an index of the selected candidate predicted motion information in the candidate predicted motion information list;
a second determining unit configured to determine a correspondence between a motion vector difference and the motion vector predicted value based on the predicted motion information;
an acquisition unit configured to acquire a motion vector difference corresponding to the motion vector prediction based on the correspondence and the motion vector;
a first encoding unit configured to encode the index and the motion vector difference into a bitstream.
(Example 26)
The second decision unit includes:
a first determining sub-unit configured to determine a prediction mode of the current image block based on the reference image information, the prediction mode comprising a first prediction mode comprising unidirectional prediction or bidirectional prediction; a decision subunit;
a second determining subunit configured to determine the number of motion vector differences based on the prediction mode;
a third determining sub-unit configured to determine the correspondence between the motion vector differences and the motion vector predictions based on the number of motion vector differences and the predicted motion information;
The video encoding terminal according to Example 25.
(Example 27)
Specifically, the second determining subunit:
If the prediction mode is the unidirectional prediction, determining that there is one motion vector difference, or
If the prediction mode is the bidirectional prediction and the reference picture information includes a picture order count of the reference picture of the current picture block, based on the picture order count of the reference picture of the current picture block. , determining the number of motion vector differences, or
When the prediction mode is the bidirectional prediction, the preset number of motion vector differences is calculated from the bitstream of the current image block, slice layer header information of the bitstream, and image layer header information of the bitstream. , and configured to encode at least one of sequence layer header information of the bitstream.
The video encoding terminal according to Example 26.
(Example 28)
When determining the number of motion vector differences based on the picture order count of the reference picture of the current image block, the second determining sub-unit specifically:
The picture order count of a first reference picture of the current image block is greater than the picture order count of the current image block, and the picture order count of a second reference picture of the current image block is greater than the picture order count of the current image block. If it is less than the picture order count of the block, determine that there is a difference between the two motion vectors, or
The picture order count of each reference picture of the current picture block is greater than the picture order count of the current picture block, or the picture order count of each reference picture of the current picture block is equal to the picture order of the current picture block. configured to determine that there is one motion vector difference if less than the count;
The video encoding terminal according to Example 27.
(Example 29)
When the prediction mode is the bidirectional prediction, the predicted motion information includes two motion vector predicted values, a first motion vector predicted value and a second motion vector predicted value, and the third determination subunit Specifically,
If two motion vector differences exist, the two motion vector differences are used separately as motion vector differences corresponding to the first motion vector prediction value and the second motion vector prediction value, or
If one motion vector difference exists, the motion vector difference is used as the motion vector difference corresponding to the first motion vector prediction value, and the motion vector difference corresponding to the second motion vector prediction value is set to zero. or use the motion vector difference as a motion vector difference corresponding to the second motion vector predicted value and set the motion vector difference corresponding to the first motion vector predicted value to 0; Alternatively, the motion vector difference is used as a motion vector difference corresponding to each of the first motion vector predicted value and the second motion vector predicted value, or the motion vector difference is used based on a preset correspondence relationship. configured to determine a correspondence between a vector difference and each of the first motion vector predictor and the second motion vector predictor, and encode the preset correspondence into the bitstream; be done,
The video encoding terminal according to any one of Examples 26 to 28.
(Example 30)
The video encoding terminal further includes:
configured to encode the number of pieces of candidate predicted motion information in the candidate predicted motion information list into at least one of the slice layer header information, the image layer header information, and the sequence layer header information of the bitstream. comprising a second encoding unit;
The video encoding terminal according to any one of Examples 27 to 29.
(Example 31)
The number of pieces of candidate predicted motion information in the candidate predicted motion information list is smaller than the number of pieces of motion information in the merge mode motion information list.
The video encoding terminal according to Example 30.
(Example 32)
the current image block is an arbitrary prediction unit of the current image block to be encoded corresponding to the bitstream;
The video encoding terminal according to any one of Examples 25 to 31.

It should be noted that the division of devices is only a division of logical functions, and the invention is not limited to the above-mentioned divisions, as long as the corresponding functions can be realized. In addition, the specific names of the functional units are only provided for the purpose of distinguishing the units from each other and are not intended to limit the protection scope of the present invention.

In addition, those skilled in the art can appreciate that all or some of the steps of the method embodiments may be implemented by a program instructing relevant hardware. The program may be stored on a computer readable storage medium. The storage medium may include read-only memory, magnetic disks, optical disks, or the like.

The above description is only a specific exemplary implementation of the present invention, and is not intended to limit the protection scope of the present invention. Any modification or replacement easily conceived by a person skilled in the art within the technical scope disclosed in the embodiments of the present invention shall fall within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (15)

constructing a candidate predicted motion information list for a current image block, said candidate predicted motion information list including candidate predicted motion information, said candidate predicted motion information for said current image block in a temporal domain or a spatial domain; a step comprising motion information of neighboring blocks of the block;
Based on the motion vector of the current image block obtained during motion estimation, one candidate predicted motion information is selected from the candidate predicted motion information list as the predicted motion information of the current image block, and the candidate prediction is determining an index of the selected candidate predicted motion information in a motion information list, the predicted motion information including reference image information and a motion vector predicted value;
determining a correspondence between a motion vector difference and the motion vector predicted value based on the predicted motion information;
obtaining a motion vector difference corresponding to the motion vector predicted value based on the correspondence relationship and the motion vector;
encoding the index and the motion vector difference into a bitstream ;
When the prediction mode of the current image block is bidirectional prediction, the predicted motion information includes two motion vector predicted values, a first motion vector predicted value and a second motion vector predicted value, and the predicted motion information includes two motion vector predicted values, a first motion vector predicted value and a second motion vector predicted value, and the predicted motion information includes two motion vector predicted values, a first motion vector predicted value and a second motion vector predicted value, and The motion vector difference is reconstructed by the first motion vector predictor and the second motion vector predictor by adding a difference to the first motion vector predictor and the second motion vector predictor. used
Video encoding method. The step of determining a correspondence between a motion vector difference and the motion vector predicted value based on the predicted motion information includes:
determining a prediction mode for the current image block based on the reference image information, the prediction mode including unidirectional prediction or bidirectional prediction;
determining the number of motion vector differences based on the prediction mode;
determining the correspondence between the motion vector difference and the motion vector predicted value based on the number of motion vector differences and the predicted motion information;
The video encoding method according to claim 1. The step of determining the number of motion vector differences based on the prediction mode includes:
if the prediction mode is the unidirectional prediction, determining that one motion vector difference exists; or
If the prediction mode is the bidirectional prediction and the reference picture information includes a picture order count of the reference picture of the current picture block, based on the picture order count of the reference picture of the current picture block. , determining the number of motion vector differences, or
When the prediction mode is the bidirectional prediction, the preset number of motion vector differences is calculated from the bitstream of the current image block, slice layer header information of the bitstream, and image layer header information of the bitstream. , and encoding at least one of sequence layer header information of the bitstream.
The video encoding method according to claim 2. The step of determining the number of motion vector differences based on the picture order count of the reference picture of the current image block comprises:
The picture order count of a first reference picture of the current image block is greater than the picture order count of the current image block, and the picture order count of a second reference picture of the current image block is greater than the picture order count of the current image block. determining that a two motion vector difference exists if the picture order count of each reference picture of the current image block is smaller than the picture order count of the current image block; or determining that a motion vector difference exists if the picture order count of each reference picture of the current image block is less than the picture order count of the current image block;
The video encoding method according to claim 3. The method further comprises: encoding the number of pieces of candidate predicted motion information in the candidate predicted motion information list into at least one of the slice layer header information, the image layer header information, and the sequence layer header information of the bitstream. The video encoding method according to item 3 or 4 . The number of pieces of candidate predicted motion information in the candidate predicted motion information list is smaller than the number of pieces of motion information in the merge mode motion information list.
The video encoding method according to claim 5 . the current image block is an arbitrary prediction unit of the current image block to be encoded corresponding to the bitstream;
The video encoding method according to any one of claims 1 to 6 . A list construction unit configured to construct a candidate predicted motion information list for a current image block, wherein the candidate predicted motion information list includes candidate predicted motion information, and the candidate predicted motion information is arranged in a temporal domain or in a spatial domain. a list construction unit comprising motion information of neighboring blocks of the current image block in a region;
Based on the motion vector of the current image block obtained during motion estimation, one candidate predicted motion information is configured to be selected from the list of candidate predicted motion information as the predicted motion information of the current image block. a selection unit, wherein the predicted motion information includes reference image information and a motion vector predicted value;
a first determining unit configured to determine an index of the selected candidate predicted motion information in the candidate predicted motion information list;
a second determining unit configured to determine a correspondence between a motion vector difference and the motion vector predicted value based on the predicted motion information;
an acquisition unit configured to acquire a motion vector difference corresponding to the motion vector prediction based on the correspondence and the motion vector;
a first encoding unit configured to encode the index and the motion vector difference into a bitstream ;
When the prediction mode of the current image block is bidirectional prediction, the predicted motion information includes two motion vector predicted values, a first motion vector predicted value and a second motion vector predicted value, and the predicted motion information includes two motion vector predicted values, a first motion vector predicted value and a second motion vector predicted value, and the predicted motion information includes two motion vector predicted values, a first motion vector predicted value and a second motion vector predicted value, and The motion vector difference is reconstructed by the first motion vector predictor and the second motion vector predictor by adding a difference to the first motion vector predictor and the second motion vector predictor. used
Video encoding terminal. The second decision unit includes:
a first determining sub-unit configured to determine a prediction mode of the current image block based on the reference image information, the prediction mode comprising a first prediction mode comprising unidirectional prediction or bidirectional prediction; a decision subunit;
a second determining subunit configured to determine the number of motion vector differences based on the prediction mode;
a third determining sub-unit configured to determine the correspondence between the motion vector differences and the motion vector predictions based on the number of motion vector differences and the predicted motion information;
The video encoding terminal according to claim 8 . Specifically, the second determining subunit:
If the prediction mode is the unidirectional prediction, determining that there is one motion vector difference, or
If the prediction mode is the bidirectional prediction and the reference picture information includes a picture order count of the reference picture of the current picture block, based on the picture order count of the reference picture of the current picture block. , determining the number of motion vector differences, or
When the prediction mode is the bidirectional prediction, the preset number of motion vector differences is calculated from the bitstream of the current image block, slice layer header information of the bitstream, and image layer header information of the bitstream. , and configured to encode at least one of sequence layer header information of the bitstream.
The video encoding terminal according to claim 9 . When determining the number of motion vector differences based on the picture order count of the reference picture of the current image block, the second determining sub-unit specifically:
The picture order count of a first reference picture of the current image block is greater than the picture order count of the current image block, and the picture order count of a second reference picture of the current image block is greater than the picture order count of the current image block. If it is less than the picture order count of the block, determine that there is a difference between the two motion vectors, or
The picture order count of each reference picture of the current picture block is greater than the picture order count of the current picture block, or the picture order count of each reference picture of the current picture block is equal to the picture order of the current picture block. configured to determine that there is one motion vector difference if less than the count;
The video encoding terminal according to claim 10 . The video encoding terminal further includes:
configured to encode the number of pieces of candidate predicted motion information in the candidate predicted motion information list into at least one of the slice layer header information, the image layer header information, and the sequence layer header information of the bitstream. comprising a second encoding unit;
The video encoding terminal according to claim 10 or 11 . The number of pieces of candidate predicted motion information in the candidate predicted motion information list is smaller than the number of pieces of motion information in the merge mode motion information list.
The video encoding terminal according to claim 12 . the current image block is an arbitrary prediction unit of the current image block to be encoded corresponding to the bitstream;
The video encoding terminal according to any one of claims 8 to 13 . A program that causes a processor to execute the video encoding method according to any one of claims 1 to 7 .