JP7367806B2 - Transmitting device, transmitting method, receiving device and receiving method - Google Patents

Description

The present technology relates to a transmitting device, a transmitting method, a receiving device, and a receiving method, and specifically relates to a transmitting device and the like that transmits transmission video data obtained by applying high dynamic range photoelectric conversion to high dynamic range video data.

Conventionally, it has been considered to transmit transmission video data obtained by applying high dynamic range photoelectric conversion to high dynamic range video data. For example, Non-Patent Document 1 describes high dynamic range photoelectric conversion characteristics (new gamma characteristics) that include a compatible region with conventional photoelectric conversion characteristics (gamma characteristics), taking reception by conventional receivers into consideration.

Tim Borer, “Non-Linear Opto-Electrical Transfer Functions for High Dynamic Range Television”, Research & Development White Paper WHP 283, July 2014

For example, when transmitting video data obtained using high dynamic range photoelectric conversion characteristics that include a compatible region with the conventional photoelectric conversion characteristics described above, a conventional receiver can determine that the photoelectric conversion characteristics are the same as conventional ones. In addition, it is necessary for the high dynamic range compatible receiver to be able to determine that the photoelectric conversion characteristics are high dynamic range photoelectric conversion characteristics.

An object of the present technology is to enable a high dynamic range compatible receiver to appropriately perform electro-optical conversion processing on transmission video data obtained by high dynamic range photo-electric conversion.

The concept of this technology is
a photoelectric conversion unit that performs high dynamic range photoelectric conversion on high dynamic range video data to obtain high dynamic range transmission video data;
an encoding unit that receives at least the high dynamic range transmission video data and outputs a video stream including encoded video data;
a transmitter that transmits the video stream;
A transmitter comprising an information insertion unit that inserts high dynamic range conversion characteristic meta information indicating the characteristics of the high dynamic range photoelectric conversion or the characteristics of high dynamic range electro-optical conversion corresponding to the characteristics into the SEI NAL unit area of the video stream. It is in.

In the present technology, a photoelectric conversion unit performs high dynamic range photoelectric conversion on high dynamic range video data to obtain high dynamic range transmission video data. For example, the characteristics of high dynamic range photoelectric conversion include various characteristics such as STD-B67 (hybrid log gamma) and ST2084 (PQ curve). The encoder receives at least high dynamic range transmission video data and outputs a video stream including encoded video data. A video stream is transmitted by the transmitter. The information insertion unit inserts high dynamic range conversion characteristic meta information indicating the characteristics of high dynamic range photoelectric conversion or the characteristics of high dynamic range electro-optical conversion corresponding to the characteristics into the area of the SEI NAL unit of the video stream.

In this way, in the present technology, high dynamic range conversion characteristic meta information is inserted into the SEI NAL unit area of the video stream. Therefore, in a high dynamic range compatible receiver, it becomes possible to appropriately perform electro-optic conversion processing on high dynamic range transmission video data based on this high dynamic range conversion characteristic meta information.

Note that in the present technology, for example, the encoding unit inputs normal dynamic range transmission video data obtained by performing normal dynamic range photoelectric conversion on normal dynamic range video data together with high dynamic range transmission video data, and inputs normal dynamic range transmission video data obtained by performing normal dynamic range photoelectric conversion on normal dynamic range video data, outputting a basic video stream containing encoded video data of the transmission video data and an extended video stream containing encoded video data of the difference between the high dynamic range transmission video data and the normal dynamic range transmission video data; inserts high dynamic range conversion characteristic meta information into the SEI NAL unit area of the extended video stream, and normal dynamic range conversion characteristic meta information indicating normal dynamic range photoelectric conversion characteristics into the SPS NAL unit area of the basic video stream. may be inserted.

In this case, the high dynamic range capable receiver obtains high dynamic range transmission video data from the basic video stream and the extended video stream, and inserts the high dynamic range transmitted video data into the area of the SEI NAL unit of the extended video stream. It becomes possible to appropriately perform electro-optical conversion processing based on the high dynamic range conversion characteristic meta information and obtain video data for display. In addition, the normal dynamic range compatible receiver obtains normal dynamic range transmission video data from the basic video stream, and applies normal dynamic range conversion to this normal dynamic range transmission video data, which is inserted into the area of the SPS NAL unit of the basic video stream. It becomes possible to appropriately perform electro-optical conversion processing based on the characteristic meta information and obtain video data for display.

Further, in the present technology, for example, the information insertion section may insert meta information for display control into the area of the SEI NAL unit together with high dynamic range conversion characteristic meta information. In this case, for example, the meta information for display control may include peak luminance information. Further, for example, the meta information for display control may further include area information indicating an area where brightness conversion is permitted. In this case, in the high dynamic range compatible receiver, display brightness control can be appropriately performed using this meta information for display control.

In addition, other concepts of this technology are:
a receiving unit that receives a video stream;
a decoding unit that performs decoding processing on the video stream to obtain high dynamic range transmission video data;
High dynamic range conversion characteristic meta information indicating the characteristics of high dynamic range photoelectric conversion or the characteristics of high dynamic range electric conversion corresponding to the characteristics is inserted in the SEI NAL unit area of the video stream,
The receiving device further includes an electro-optical converter that performs high dynamic range electro-optical conversion on the high dynamic range transmission video data based on meta information indicating the high dynamic range conversion characteristics to obtain display video data.

In the present technology, a video stream is received by a receiving unit. The decoding section performs decoding processing on the video stream to obtain high dynamic range transmission video data. High dynamic range conversion characteristic meta information indicating high dynamic range photoelectric conversion characteristics or high dynamic range electro-optical conversion characteristics corresponding to the characteristics is inserted in the SEI NAL unit area of the video stream. The electro-optical converter performs high dynamic range electro-optical conversion on the high dynamic range transmission video data based on the high dynamic range conversion characteristic meta information, thereby obtaining display video data.

For example, the receiving unit includes a basic video stream including encoded video data of the normal dynamic range transmission video data, and encoded video data of the difference between the high dynamic range transmission video data and the normal dynamic range transmission video data. The decoding unit receives the extended video stream, performs decoding processing on the basic video stream to obtain normal dynamic range transmission video data, and uses this normal dynamic range transmission video data to perform decoding processing on the extended video stream to obtain high dynamic range transmission video data. Range-transmitted video data may be obtained, and high dynamic range conversion characteristic meta information may be inserted into a region of an SEI NAL unit of an enhanced video stream.

In this way, in this technology, video data for display is obtained by performing electrical conversion on high dynamic range transmission video data based on the high dynamic range conversion characteristic meta information inserted in the SEI NAL unit area of the video stream. It is. Therefore, it is possible to appropriately perform electro-optical conversion on high dynamic range transmission video data, and it is possible to obtain good high dynamic range video data as video data for display.

Note that in the present technology, for example, peak brightness information is further inserted into the area of the SEI NAL unit, and the display video data further includes a brightness adjustment unit that adjusts display brightness based on the peak brightness information. may be done. By adjusting the display brightness based on the peak brightness information in this way, it becomes possible to appropriately adjust the display brightness according to the display brightness capability of the monitor.

Further, in this case, for example, area information indicating an area where brightness conversion is allowed is further inserted in the area of the SEI NAL unit, and the brightness adjustment section, based on the area information showing the area where brightness conversion is allowed, The display brightness may be adjusted in an area that allows brightness conversion. By adjusting the display brightness in an area that allows brightness conversion in this way, it is possible to satisfactorily reproduce the brightness atmosphere intended by the producer.

According to the present technology, it is possible to appropriately perform electro-optical conversion processing on transmitted video data obtained by high dynamic range photo-electric conversion in a high dynamic range compatible receiver. Note that the effects described in this specification are merely examples and are not limiting, and additional effects may also be provided.

1 is a block diagram showing a configuration example of a transmitting/receiving system as an embodiment. FIG. FIG. 2 is a block diagram illustrating a configuration example of a transmitting device that constitutes a transmitting/receiving system. 2 is a block diagram illustrating a configuration example of a video data generation section that generates SDR video data V1 and HDR video data V2. FIG. It is a figure which shows an example of the photoelectric conversion characteristic of SDR and HDR. FIG. 3 is a diagram showing an example structure of a dynamic range/SEI message. FIG. 3 is a diagram showing the contents of main information in a structural example of a dynamic range/SEI message. FIG. 3 is a diagram illustrating a configuration example of a transport stream TS. 1 is a block diagram illustrating a configuration example of a conventional SDR-compatible (HDR-incompatible) receiving device that constitutes a transmitting/receiving system. FIG. 2 is a block diagram illustrating a configuration example of an HDR-compatible receiving device that constitutes a transmitting and receiving system. FIG. 6 is a diagram illustrating an example of display brightness adjustment in an HDR display mapping section.

Hereinafter, modes for carrying out the invention (hereinafter referred to as "embodiments") will be described. The explanation will be given in the following order.
1. Embodiment 2. Variant

<1. Embodiment>
[Example of configuration of sending/receiving system]
FIG. 1 shows a configuration example of a transmitting/receiving system 10 as an embodiment. This transmitting/receiving system 10 includes a transmitting device 100 and receiving devices 200 and 300. The receiving device 200 is a conventional receiving device that supports standard dynamic range (SDR) and does not support high dynamic range (HDR). The receiving device 300 is an HDR compatible receiving device.

The transmitting device 100 transmits an MPEG-2 transport stream (hereinafter simply referred to as "transport stream TS") as a container stream (multiplexed stream) on a broadcast wave or a packet on the Internet. This transport stream TS includes video streams such as HEVC and AVC, and in this embodiment, two video streams, a basic video stream and an extended video stream.

The basic video stream includes encoded video data obtained by predictively encoding SDR transmission video data. The SDR transmission video data is obtained by performing SDR photoelectric conversion on the SDR video data. The extended video stream includes encoded video data obtained by performing predictive encoding on HDR transmission video data using SDR transmission video data. HDR transmission video data is obtained by performing HDR photoelectric conversion on HDR video data.

In this embodiment, in the video stream, in the SEI NAL unit area of the extended video stream, HDR conversion that indicates the characteristics of HDR photoelectric conversion (for example, STD-B67, ST2084, etc.) or the characteristics of HDR electro-optical conversion corresponding to the characteristics. Characteristic meta information is inserted. Then, in this embodiment, SDR conversion characteristic meta information indicating SDR photoelectric conversion characteristics (BT-709: gamma characteristics) is inserted into the video stream in the SPS NAL unit area of the basic video stream.

Further, in this embodiment, meta information for display control is inserted into the video stream, in the SEI NAL unit area of the extended video stream, together with this HDR conversion characteristic meta information. This meta information for display control includes peak brightness information, area information indicating an area where brightness conversion is allowed, and the like.

The receiving device 200 receives a transport stream TS sent from the transmitting device 100 in a broadcast wave or a packet on the Internet. As described above, this transport stream TS includes two video streams: a basic video stream and an extended video stream in this embodiment. Then, SDR conversion characteristic meta information is inserted into the SPS NAL unit area of the received video stream, in this embodiment, the basic video stream.

The receiving device 200 extracts a necessary video stream, in this case a basic video stream, from the transport stream TS, performs decoding processing to obtain SDR transmission video data, and performs a decoding process on the SDR transmission video data based on the SDR conversion characteristic meta information. Then, appropriate electro-optical conversion processing is performed to obtain SDR video data as display video data. Further, the receiving device 200 performs display mapping processing, that is, display brightness adjustment, on the display video data based on the peak brightness (100 cd/m ² ), the maximum display brightness of the monitor, and the like.

The receiving device 300 receives a transport stream TS transmitted from the transmitting device 100 in a broadcast wave or a packet on the Internet. As described above, this transport stream TS includes two video streams: a basic video stream and an extended video stream in this embodiment. Then, HDR conversion characteristic meta information is inserted into the SEI NAL unit area of the received video stream, in this embodiment, the extended video stream.

The receiving device 300 extracts necessary video streams, here both a basic video stream and an extended video stream, from the transport stream TS, performs decoding processing to obtain HDR transmission video data, and adds HDR to this HDR transmission video data. Based on the conversion characteristic meta information, electro-optical conversion processing is appropriately performed to obtain HDR video data as video data for display. Furthermore, the receiving device 300 performs display mapping processing, that is, display brightness adjustment, on the display video data based on the meta information for display control inserted with the HDR conversion characteristic meta information, the maximum display brightness of the monitor, etc. do.

"Example configuration of transmitting device"
FIG. 2 shows a configuration example of the transmitting device 100. This transmitting device 100 handles SDR video data V1 and HDR video data V2. This HDR video data V2 has a brightness in the range of 0 to 100%*N, for example 0 to 1000% or more, assuming that the brightness of the white peak of the conventional SDR image is 100%.

FIG. 3 shows an example of the configuration of the video data generation unit 150 that generates SDR video data V1 and HDR video data V2. This image data generation section 150 includes an HDR camera 151 and a dynamic range conversion section 153. The HDR camera 151 images a subject and outputs HDR video data V2. The dynamic range conversion unit 153 performs a process of converting HDR video data V2 output from the HDR camera 151 from HDR to SDR, and outputs SDR video data V1.

Returning to FIG. 2, the transmitting device 100 includes a control section 101, an SDR photoelectric conversion section 102, an HDR photoelectric conversion section 103, a video encoder 104, a system encoder 105, and a transmitting section 106. The control unit 101 includes a CPU (Central Processing Unit), and controls the operation of each unit of the transmitting device 100 based on a control program.

The SDR photoelectric conversion unit 102 applies SDR photoelectric conversion characteristics (BT.709: gamma characteristics) to the SDR video data V1 to obtain SDR video data for transmission, that is, SDR transmission video data V1'. The HDR photoelectric conversion unit 103 applies HDR photoelectric conversion characteristics (for example, STD-B67, ST2084, etc.) to the HDR video data V2 to obtain HDR video data for transmission, that is, HDR transmission video data V2'. .

FIG. 4 shows an example of SDR and HDR photoelectric conversion characteristics. In this figure, the horizontal axis shows the input luminance level, and the vertical axis shows the transmission code value. A broken line a indicates SDR photoelectric conversion characteristics (BT.709: gamma characteristics). The solid line b indicates the characteristics of STD-B67 (HLG) as the HDR photoelectric conversion characteristics. A dashed-dotted line c indicates the characteristics of ST2084 (PQ curve) as the HDR photoelectric conversion characteristics.

The characteristics of STD-B67 (HLG) include a compatible region with SDR photoelectric conversion characteristics (BT.709: gamma characteristics). That is, the curves of both characteristics match until the input luminance level reaches the compatible limit value of both characteristics. When the input luminance level is at the compatible limit value, the transmission code value is at the compatible level SP. ST2084 (PQ curve) is a quantization step curve adapted to the human eye. In the HDR photoelectric conversion characteristic, when the input luminance level is the peak luminance PL, the transmission code value becomes the peak level MP.

The HDR display reference threshold CL indicates the boundary between the area where the brightness displayed on the receiver side monitor (CE monitor) is matched and the area where the brightness is dependent on the CE monitor. When the input luminance level is the compatibility limit value CL, the transmission code value is the threshold level CP. Note that in the SDR photoelectric conversion characteristic, when the input luminance level is the SDR characteristic expression limit luminance SL, the transmission code value becomes the peak level MP. Here, SL is 100 cd/ ^m2 .

Returning to FIG. 2, the video encoder 104 includes an encoding section 104b and an encoding section 104e. The encoding unit 104b converts the SDR transmission video data V1' into H. 264/AVC, H. Predictive encoding processing such as H.265/HEVC is performed to obtain encoded video data. In this case, the encoding unit 104b performs prediction within the SDR transmission video data V1'. Further, this encoding unit 104b generates a video stream including this encoded video data, that is, a basic video stream STb, using a stream formatter (not shown) provided at a subsequent stage.

At this time, the encoding unit 104b inserts SDR conversion characteristic meta information indicating the characteristics of SDR photoelectric conversion into the layer of the basic video stream STb. That is, the encoding unit 104b writes SDR conversion characteristics meta information "Transfer characteristics 1" indicating SDR photoelectric conversion characteristics (BT.709: gamma characteristics) in the VUI (video usability information) area of the SPS NAL unit of the access unit (AU). ” is inserted.

The encoding unit 104e converts the HDR transmission video data V2' into H. 264/AVC, H. Predictive encoding processing such as H.265/HEVC is performed to obtain encoded video data. In this case, the encoding unit 104e selectively changes the prediction within the HDR transmission video data V2' or the prediction between the SDR transmission video data V1' for each encoded block in order to reduce the prediction residual. conduct. Further, this encoding unit 104e generates a video stream including this encoded video data, that is, an extended video stream STe, using a stream formatter (not shown) provided at a subsequent stage.

At this time, the encoding unit 104e adds HDR conversion characteristic meta information indicating the characteristics of HDR photoelectric conversion (for example, STD-B67, ST2084, etc.) or the characteristics of HDR photoelectric conversion corresponding to the characteristics to the layer of the extended video stream STe. Insert meta information for display control. That is, the encoding unit 104e creates a newly defined dynamic range/SEI message that has HDR conversion characteristics meta information "transfer_characteristics 2" and meta information for display control in the "Suffix_SEIs" part of the access unit (AU), for example. (Dynamic Range SEI message).

FIG. 5 shows an example structure (syntax) of a dynamic range SEI message. FIG. 6 shows the contents (semantics) of main information in the example structure. The 8-bit field "transfer_characteristics 2" indicates the HDR photoelectric conversion characteristics or the HDR photoelectric conversion characteristics corresponding to the characteristics. If the meta information "transfer_characteristics 2" exists, the HDR compatible receiving device 300 gives priority to the meta information "transfer characteristics 1" inserted in the VUI area and refers to it during display.

The 8-bit field "number_of_bits" indicates the number of encoded pixel bits. The 16-bit field "minimum_brightness_value" indicates the minimum level of brightness (cd/m ² ). The 16-bit field "peak_level" indicates the relative value (%) of the maximum level. The 16-bit field of “peak_level_brightness” indicates the maximum level of brightness (cd/m ² ) and corresponds to the peak brightness PL in FIG. 4. With "peak_level" or "peak_level_brightness", it is possible to select an image processing method when creating a display image suitable for the display capacity after taking a histogram of the image.

The 16-bit field "compliant_threshold_level" indicates the threshold (%) for display level mapping. The 16-bit field of "compliant_threshold_level_value" indicates the luminance (cd/m ² ) that is a threshold for display level mapping, and corresponds to the HDR display reference threshold CL in FIG. 4 .

Returning to FIG. 2, the system encoder 105 generates a transport stream TS including the basic video stream STb generated by the video encoder 104 and the extended video stream Ste. The transmitter 106 transmits the transport stream TS to the receivers 200 and 300 by putting it on a broadcast wave or a network packet.

The operation of transmitting device 100 shown in FIG. 2 will be briefly described. The SDR video data V1 is supplied to the SDR photoelectric conversion unit 102. In this SDR photoelectric conversion unit 102, SDR photoelectric conversion characteristics (BT.709: gamma characteristics) are applied to the SDR video data V1 to obtain SDR transmission video data V1' which is SDR video data for transmission. .

Further, the HDR video data V2 is supplied to the HDR photoelectric conversion unit 103. In this HDR photoelectric conversion unit 103, HDR photoelectric conversion characteristics (for example, STD-B67, ST2084, etc.) are applied to the HDR video data V2, and HDR transmission video data V2', which is HDR video data for transmission, is can get.

The SDR transmission video data V1' obtained by the SDR photoelectric conversion section 102 is supplied to the encoding section 104b and the encoding section 104e of the encoder 104. This encoder 104b converts the SDR transmission video data V1' into H. 264/AVC, H. A predictive encoding process such as H.265/HEVC is performed to obtain encoded video data, and a basic video stream STb, which is a video stream including this encoded video data, is generated.

At this time, the encoding unit 104b inserts SDR conversion characteristic meta information indicating the characteristics of SDR photoelectric conversion into the layer of the basic video stream STb. In this case, SDR conversion characteristics meta information "Transfer characteristics 1" indicating SDR photoelectric conversion characteristics (BT.709: gamma characteristics) is inserted into the VUI area of the SPS NAL unit of the access unit (AU).

HDR transmission video data V2' obtained by the HDR photoelectric conversion section 103 is supplied to the encoding section 104e of the encoder 104. In this encoding unit 104e, the SDR transmission video data V1' is used for the HDR transmission video data V2', and the HDR transmission video data V1' is used. 264/AVC, H. A predictive encoding process such as H.265/HEVC is performed to obtain encoded video data, and an extended video stream STe that is a video stream including this encoded video data is generated.

At this time, the encoding unit 104e adds HDR conversion characteristic meta information indicating the characteristics of HDR photoelectric conversion (for example, STD-B67, ST2084, etc.) or the characteristics of HDR photoelectric conversion corresponding to the characteristics to the layer of the extended video stream STe. Meta information for display control is inserted. In this case, a dynamic range SEI message having HDR conversion characteristics meta information "transfer_characteristics 2" and meta information for display control is inserted into the "Suffix_SEIs" portion of the access unit (AU), for example.

The basic video stream STb generated by the encoding unit 104b of the video encoder 104 is supplied to the system encoder 105. Further, the extended video stream STe generated by the encoding unit 104e of the video encoder 104 is supplied to the system encoder 105.

In the system encoder 105, each of the basic video stream STb and the extended video stream Ste is converted into PES packets, and further converted into transport packets and multiplexed, thereby obtaining a transport stream TS as a container stream (multiplexed stream). This transport stream TS is transmitted by the transmitter 106 to the receivers 200 and 300 on a broadcast wave or a network packet.

[Transport stream TS configuration]
FIG. 7 shows an example of the structure of the transport stream TS. This transport stream TS includes two video streams: a basic video stream STb and an extended video stream STe. In this configuration example, there is a PES packet "video PES" for each video stream.

The packet identifier (PID) of the basic video stream STb is, for example, PID1. This basic video stream STb includes encoded video data obtained by performing predictive encoding on the SDR transmission video data V1'. Each access unit of this basic video stream STb includes NAL units such as AUD, VPS, SPS, PPS, PSEI, SLICE, SSEI, and EOS.

“nuh_layer_id” in the header of each NAL unit is, for example, “0”, indicating that it is encoded video data related to the basic video stream STb. Furthermore, SDR conversion characteristics meta information “Transfer characteristics 1” indicating the characteristics of SDR photoelectric conversion (BT.709: gamma characteristics) is inserted in the VUI area of the SPS NAL unit.

Furthermore, the packet identifier (PID) of the extended video stream STe is, for example, PID2. This extended video stream STe includes encoded video data obtained by performing predictive encoding on HDR transmission video data V2' using SDR transmission video data V1'. Each access unit of this extended video stream STe includes NAL units such as AUD, PPS, PSEI, SLICE, SSEI, and EOS.

“nuh_layer_id” in the header of each NAL unit is, for example, “1”, indicating that it is encoded video data related to the extended video stream STe. A dynamic range/SEI message in which HDR conversion characteristics meta information "Transfer characteristics 2" and meta information for display control are described is inserted into the access unit.

The transport stream TS also includes a PMT (Program Map Table) as PSI (Program Specific Information). PSI is information that describes which program each elementary stream included in a transport stream belongs to.

A PMT has a program loop that describes information related to the entire program. Furthermore, in the PMT, there is an elementary stream loop that has information related to each elementary stream. In this configuration example, there are two video elementary stream loops (video ES loop) corresponding to two video streams, the basic video stream STb and the extended video stream STe.

Information such as a stream type (ST0) and a packet identifier (PID1) is arranged in the video elementary stream loop corresponding to the basic video stream STb. Furthermore, information such as a stream type (ST1) and a packet identifier (PID2) is arranged in the video elementary stream loop corresponding to the extended video stream STe.

"Example of configuration of SDR compatible receiving device"
FIG. 8 shows a configuration example of the receiving device 200. This receiving device 200 is an SDR compatible receiving device as described above. This receiving device 200 includes a control section 201, a receiving section 202, a system decoder 203, a video decoder 204, an SDR electro-optical converter 205, an SDR display mapping section 206, and a CE monitor 207. The control section 201 includes a CPU (Central Processing Unit), and controls the operation of each section of the receiving device 200 based on a control program.

The receiving unit 202 receives the transport stream TS sent from the transmitting device 100 in a broadcast wave or a packet on the Internet. This transport stream TS includes two video streams: a basic video stream STb and an extended video stream STe.

The basic video stream STb includes encoded video data obtained by predictively encoding SDR transmission video data. The SDR transmission video data is obtained by performing SDR photoelectric conversion on the SDR video data. The extended video stream STe includes encoded video data obtained by performing predictive encoding using SDR transmission video data on HDR transmission video data. HDR transmission video data is obtained by performing HDR photoelectric conversion on HDR video data.

SDR conversion characteristic meta information indicating the characteristics of SDR photoelectric conversion is inserted in the area of the SPS NAL unit of the basic video stream. Further, HDR conversion characteristic meta information indicating the characteristics of HDR photoelectric conversion or the characteristics of HDR electro-optical conversion corresponding to the characteristics is inserted in the area of the SEI NAL unit of the extended video stream.

System decoder 203 extracts basic video stream STb from transport stream TS. Video decoder 204 includes a decoding section 204b. This decoding unit 204b performs decoding processing on the basic video stream STb extracted by the system decoder 203 to obtain SDR transmission video data V1'. In this case, the decoding unit 204b performs processing opposite to that of the encoding unit 104b of the video encoder 104 in FIG. 2.

Furthermore, the decoding unit 204b extracts the parameter set and SEI message inserted into each access unit of the basic video stream STb, and sends them to the control unit 201. The control unit 201 recognizes the SDR photoelectric conversion characteristics (BT.709: gamma characteristics) based on the SDR conversion characteristic meta information “Transfer characteristics 1” in the video usability information (VUI) of the SPS, and controls the SDR photoelectric conversion unit. In step 205, an SDR electro-optical conversion characteristic which is opposite to the SDR photo-electric conversion characteristic is set.

The SDR electro-optical conversion unit 205 applies SDR electro-optical conversion characteristics to the transmission video data V1' output from the video decoder 204 to obtain SDR video data V1. The SDR display mapping unit 206 performs display brightness adjustment on the SDR video data V1 obtained by the SDR electro-optical conversion unit 205. That is, if the maximum brightness display ability of the CE monitor 207 is higher than the SDR characteristic expression limit brightness SL (see FIG. 4), the SDR display mapping unit 206 determines that the maximum display brightness level becomes the maximum brightness display ability of the CE monitor 207. Display mapping processing, that is, brightness conversion processing is performed as follows.

The operation of the receiving device 200 shown in FIG. 8 will be briefly described. The receiving unit 202 receives the transport stream TS sent from the transmitting device 100 in a broadcast wave or a packet on the Internet. This transport stream TS is supplied to the system decoder 203. The system decoder 203 extracts a basic video stream STb from this transport stream TS.

Basic video stream STb extracted by system decoder 203 is supplied to decoding section 204b of video decoder 204. The decoding unit 204b performs decoding processing on the basic video stream STb to obtain SDR transmission video data V1'. Furthermore, the decoding unit 204b extracts the parameter set and SEI message inserted into the basic video stream STb, and sends them to the control unit 201.

The control unit 201 recognizes the SDR photoelectric conversion characteristics (BT.709: gamma characteristics) based on the SDR conversion characteristics meta information "Transfer characteristics 1" in the video usability information (VUI) of the SPS. Then, under the control of the control unit 201, the SDR electro-optical conversion unit 205 is set with an SDR electro-optical conversion characteristic that is opposite to the SDR photoelectric conversion characteristic.

SDR transmission video data V1' obtained by the video decoder 204 (decoding section 204b) is supplied to the SDR electro-optical conversion section 205. In the SDR electro-optical conversion unit 205, SDR electro-optical conversion characteristics are applied to the SDR transmission video data V1' to obtain SDR video data V1 as display video data.

The SDR video data V1 obtained by the SDR electro-optical conversion section 205 is supplied to the SDR display mapping section 206. In the SDR display mapping section 206, display brightness adjustment is performed on the SDR video data V1. That is, when the maximum brightness display capability of the CE monitor 207 is higher than SL, the SDR display mapping unit 206 performs display mapping processing, that is, brightness conversion processing, so that the maximum display brightness level becomes the maximum brightness display capability of the CE monitor 207. will be held.

The output video data of the SDR display mapping section 206 is supplied to the CE monitor 207. On this CE monitor 207, an SDR image is displayed using SDR video data whose display brightness has been adjusted.

“Example of configuration of HDR compatible receiving device”
FIG. 9 shows a configuration example of the receiving device 300. This receiving device 300 is an HDR compatible receiving device as described above. This receiving device 300 includes a control section 301 , a receiving section 302 , a system decoder 303 , a video decoder 304 , an HDR electro-optic converter 305 , an HDR display mapping section 306 , and a CE monitor 307 . The control section 301 includes a CPU (Central Processing Unit), and controls the operation of each section of the receiving device 300 based on a control program.

The receiving unit 302 receives a transport stream TS sent from the transmitting device 100 in a broadcast wave or a packet on the Internet. This transport stream TS includes two video streams: a basic video stream STb and an extended video stream STe.

The basic video stream STb includes encoded video data obtained by predictively encoding SDR transmission video data. The SDR transmission video data is obtained by performing SDR photoelectric conversion on the SDR video data. The extended video stream STe includes encoded video data obtained by performing predictive encoding using SDR transmission video data on HDR transmission video data. HDR transmission video data is obtained by performing HDR photoelectric conversion on HDR video data.

SDR conversion characteristic meta information indicating the characteristics of SDR photoelectric conversion is inserted in the area of the SPS NAL unit of the basic video stream. Further, HDR conversion characteristic meta information indicating the characteristics of HDR photoelectric conversion or the characteristics of HDR electro-optical conversion corresponding to the characteristics is inserted in the area of the SEI NAL unit of the extended video stream.

System decoder 303 extracts basic video stream STb and extended video stream STe from this transport stream TS. Video decoder 304 has decoding sections 304b and 304e. The decoding unit 304b performs decoding processing on the basic video stream STb extracted by the system decoder 303 to obtain SDR transmission video data V1'. In this case, the decoding unit 304b performs processing opposite to that of the encoding unit 104b of the video encoder 104 in FIG. 2. Furthermore, the decoding unit 304b extracts the parameter set and SEI message inserted into each access unit of the basic video stream STb, and sends them to the control unit 301.

The decoding unit 304e performs decoding processing using the SDR transmission video data V1' on the extended video stream STe extracted by the system decoder 303 to obtain HDR transmission video data V2'. In this case, the decoding unit 304e performs processing opposite to that of the encoding unit 104e of the video encoder 104 in FIG. 2. Furthermore, the decoding unit 304e extracts the parameter set and SEI message inserted into each access unit of the extended video stream STe, and sends them to the control unit 301.

The control unit 301 recognizes the HDR photoelectric conversion characteristics (for example, STD-B67, ST2084, etc.) based on the HDR conversion characteristic meta information “Transfer characteristics 2” in the dynamic range/SEI message, and instructs the HDR photoelectric conversion unit 305 to HDR electro-optical conversion characteristics that are opposite to the HDR photo-electric conversion characteristics are set. The HDR electro-optical converter 305 applies HDR electro-optical conversion characteristics to the HDR transmission video data V2' output from the video decoder 304 (decoder 304e) to obtain HDR video data V2 as display video data.

Under the control of the control unit 301, the HDR display mapping unit 306 performs a mapping operation on the HDR video data V2 obtained by the HDR electro-optical conversion unit 305, based on the meta information for display control in the dynamic range/SEI message. Adjust display brightness. This display brightness adjustment will be explained.

FIG. 10 shows an example of display brightness adjustment. In this figure, the horizontal axis indicates the transmission code value corresponding to the vertical axis in FIG. The vertical axis indicates the output brightness level (display brightness level) corresponding to the horizontal axis in FIG. In this figure, a solid line a is an EOTF curve showing HDR electro-optical conversion characteristics. When the transmission code value is at the peak level MP, the output luminance level is PL. Further, when the transmission code value is the threshold level CP, the output luminance level is CL.

Here, if the maximum brightness display capability of the CE monitor 307 is higher than the maximum brightness PL assumed by the master monitor on the transmitting side, the output brightness level corresponding to the transmission code value larger than the threshold level CP is displayed. Through processing in the mapping unit 306, the brightness is assigned to a range up to the maximum display brightness level DP1 of the CE monitor 307 (high brightness processing). In this figure, a two-dot chain line b indicates an example of the luminance conversion process in that case.

On the other hand, if the maximum brightness display capability of the CE monitor 307 is lower than the maximum brightness PL assumed by the master monitor on the transmitting side, the output brightness level corresponding to the transmission code value larger than the threshold level CP is Through the processing in the unit 306, the display brightness level is allocated to a range up to the maximum display brightness level DP2 of the CE monitor 307 (lower brightness processing). In this figure, a dashed-dotted line c indicates an example of the luminance conversion process in that case.

The operation of the receiving device 300 shown in FIG. 9 will be briefly described. The receiving unit 302 receives the transport stream TS sent from the transmitting device 100 in a broadcast wave or a packet on the Internet. This transport stream TS is supplied to the system decoder 303. The system decoder 303 extracts a basic video stream STb and an extended video stream STe from this transport stream TS.

The basic video stream STb extracted by the system decoder 303 is supplied to the decoding section 304b of the video decoder 304. The decoding unit 304b performs decoding processing on the basic video stream STb to obtain SDR transmission video data V1'. Furthermore, the decoding unit 304b extracts the parameter set and SEI message inserted into the basic video stream STb, and sends them to the control unit 301.

Further, the extended video stream STe extracted by the system decoder 303 is supplied to the decoding unit 304e of the video decoder 304. The decoding unit 304e performs decoding processing on the extended video stream STe using the SDR transmission video data V1' to obtain HDR transmission video data V2'. Further, the decoding unit 304ede extracts the parameter set and SEI message inserted into each access unit of the extended video stream STe, and sends them to the control unit 301.

The control unit 301 recognizes the HDR photoelectric conversion characteristics (eg, STD-B67, ST2084, etc.) based on the HDR conversion characteristics meta information "Transfer characteristics 2" in the dynamic range/SEI message. The HDR electro-optical conversion unit 305 is set with HDR electro-optical conversion characteristics that are opposite to the HDR photo-electric conversion characteristics.

HDR transmission video data V2' obtained by the video decoder 304 (decoding section 304e) is supplied to the HDR electro-optical conversion section 305. In the HDR electro-optical conversion unit 305, HDR electro-optical conversion characteristics are applied to the HDR transmission video data V2' to obtain HDR video data V2 as display video data.

HDR video data V2 obtained by the HDR electro-optical conversion section 305 is supplied to an HDR display mapping section 306. The HDR display mapping unit 306 performs display brightness adjustment on the HDR video data V2 based on meta information for display control in the dynamic range/SEI message (see FIG. 10).

The output video data of the HDR display mapping section 306 is supplied to the CE monitor 307. On this CE monitor 307, an HDR image is displayed using HDR video data whose display brightness has been adjusted.

As described above, in the transmission/reception system 10 shown in FIG. 1, HDR conversion characteristic meta information is inserted into the SEI NAL unit area of the extended video stream STe and transmitted. Therefore, the HDR-compatible receiver must appropriately perform electro-optical conversion processing on the HDR transmission video data V2' obtained by processing the basic video stream STb and the extended video stream STe, based on this HDR conversion characteristic meta information. becomes possible.

Furthermore, in the transmission/reception system 10 shown in FIG. 1, SDR conversion characteristic meta information is inserted into the SPS NAL unit area of the basic video stream STb and transmitted. Therefore, the SDR compatible receiver can appropriately perform electro-optical conversion processing on the SDR transmission video data V1' obtained by processing the basic video stream STb, based on this SDR conversion characteristic meta information.

Further, in the transmission/reception system 10 shown in FIG. 1, meta information for display control is inserted into the SEI NAL unit area of the extended video stream STe together with HDR conversion characteristic meta information and transmitted. Therefore, in an HDR compatible receiver, display brightness can be appropriately controlled using this meta information for display control. In this case, the meta information for display control includes area information indicating areas where brightness conversion is permitted, and brightness conversion is performed in accordance with the display brightness capability of the CE monitor, for example, only in areas where brightness conversion is permitted. Therefore, it is possible to satisfactorily reproduce the brightness atmosphere intended by the producer.

<2. Modified example>
Note that in the above-described embodiment, an example was shown in which meta information indicating the characteristics of HDR photoelectric conversion is inserted into the SEI NAL unit area of the extended video stream STe. However, it is also conceivable to insert meta information indicating the characteristics of this HDR photoelectric conversion into the area of the SEI NAL unit of the basic video stream STb. Even in this case, the HDR compatible receiver can appropriately perform electro-optical conversion processing on the HDR transmission video data V2' based on the meta information indicating the characteristics of the HDR photo-electric conversion.

For example, the present technology uses one video stream related to HDR transmission video data V2' obtained by applying hybrid log gamma (for example, STD-B67) HDR photoelectric conversion characteristics to HDR video data for SDR backward compatibility. This can also be applied when transmitting as a video stream. Even in this case, by inserting meta information indicating the characteristics of HDR photoelectric conversion into the area of the SEI NAL unit of this video stream, the HDR compatible receiver can perform Therefore, it becomes possible to appropriately perform electro-optical conversion processing on the HDR transmission video data V2'.

In the above-described embodiments, in the receiving apparatuses 200 and 300, the electro-optical conversion units 205 and 305 perform electro-optical conversion processing, and the display mapping units 206 and 306 display images according to the maximum brightness display capability of the CE monitors 207 and 307. An example of brightness adjustment is shown. However, by reflecting the luminance conversion characteristic in the electro-optic conversion characteristic (EOTF), it is possible to simultaneously perform the electro-optical conversion process and the display brightness adjustment using only the electro-optic converters 205 and 305.

Further, in the above-described embodiment, an example is shown in which the container is a transport stream (MPEG-2 TS). However, in this technology, the transport is not limited to TS, and even in the case of other packets, such as ISOBMFF (ISO base media file format) and MMT (MPEG Media Transport), the video layer is handled in the same way. This can be achieved with

Further, the present technology can also take the following configuration.
(1) a photoelectric conversion unit that performs high dynamic range photoelectric conversion on high dynamic range video data to obtain high dynamic range transmission video data;
an encoding unit that receives at least the high dynamic range transmission video data and outputs a video stream including encoded video data;
a transmitter that transmits the video stream;
A transmitter comprising an information insertion unit that inserts high dynamic range conversion characteristic meta information indicating the characteristics of the high dynamic range photoelectric conversion or the characteristics of high dynamic range electro-optical conversion corresponding to the characteristics into the SEI NAL unit area of the video stream. .
(2) The above encoding part is
Inputting normal dynamic range transmission video data obtained by performing normal dynamic range photoelectric conversion on the normal dynamic range video data together with the high dynamic range transmission video data,
A basic video stream containing encoded video data obtained by predictively encoding the normal dynamic range transmission video data, and a basic video stream containing encoded video data obtained by predictively encoding the normal dynamic range transmission video data, and predictively encoding the high dynamic range transmission video data using the normal dynamic range transmission video data. output an extended video stream containing the encoded video data obtained by
The above information insertion section is
The high dynamic range conversion characteristic meta information is inserted into the SEI NAL unit area of the extended video stream, and the normal dynamic range conversion characteristic indicating the normal dynamic range photoelectric conversion characteristic is inserted into the SPS NAL unit area of the basic video stream. The transmitting device according to (1) above, which inserts meta information.
(3) The above information insertion section is
The transmitting device according to (1) or (2), wherein meta information for display control is inserted into the area of the SEI NAL unit together with the high dynamic range conversion characteristic meta information.
(4) The transmitting device according to (3), wherein the meta information for display control includes peak luminance information.
(5) The transmitting device according to (4), wherein the meta information for display control further includes area information indicating an area where brightness conversion is allowed.
(6) a photoelectric conversion step of performing high dynamic range photoelectric conversion on high dynamic range video data to obtain high dynamic range transmission video data;
an encoding step of inputting at least the high dynamic range transmission video data and outputting a video stream including encoded video data;
a transmitting step of transmitting the video stream by a transmitter;
A transmission method comprising an information insertion step of inserting high dynamic range conversion characteristic meta information indicating the characteristics of the high dynamic range photoelectric conversion or the characteristics of high dynamic range electro-optical conversion corresponding to the characteristics into the SEI NAL unit area of the video stream. .
(7) a receiving unit that receives a video stream;
a decoding unit that performs decoding processing on the video stream to obtain high dynamic range transmission video data;
High dynamic range conversion characteristic meta information indicating the characteristics of high dynamic range photoelectric conversion or the characteristics of high dynamic range electric conversion corresponding to the characteristics is inserted in the SEI NAL unit area of the video stream,
The receiving device further includes an electro-optical converter that performs high dynamic range electro-optical conversion on the high dynamic range transmission video data based on the high dynamic range conversion characteristic meta information to obtain display video data.
(8) The above receiving section is
A basic video stream containing coded video data obtained by predictively coding the normal dynamic range transmission video data, and a basic video stream containing encoded video data obtained by predictively coding the normal dynamic range transmission video data, and predictively coding the high dynamic range transmission video data using the normal dynamic range transmission video data. receiving an enhanced video stream containing encoded video data obtained by
The above decoding section is
decoding the basic video stream to obtain the normal dynamic range transmission video data; using the normal dynamic range transmission video data, decoding the extended video stream to obtain the high dynamic range transmission video data;
The receiving device according to (7), wherein the high dynamic range conversion characteristic meta information is inserted into an SEI NAL unit area of the extended video stream.
(9) Peak luminance information is further inserted in the area of the SEI NAL unit,
The receiving device according to (7) or (8), further comprising a brightness adjustment section that adjusts display brightness of the display video data based on the peak brightness information.
(10) In the area of the SEI NAL unit, area information indicating an area where brightness conversion is allowed is further inserted,
The brightness adjustment section above is
The receiving device according to (9) above, wherein the display brightness adjustment is performed in a region that allows brightness conversion based on region information indicating a region that allows brightness conversion.
(11) a receiving step of receiving the video stream by the receiving unit;
a decoding step of performing decoding processing on the video stream to obtain high dynamic range transmission video data;
High dynamic range conversion characteristic meta information indicating the characteristics of high dynamic range photoelectric conversion or the characteristics of high dynamic range electric conversion corresponding to the characteristics is inserted in the SEI NAL unit area of the video stream,
The receiving method further comprises the step of performing high dynamic range electro-optical conversion on the high dynamic range transmission video data based on the high dynamic range conversion characteristic meta information to obtain display video data.

The main feature of this technology is to insert and transmit HDR conversion characteristic meta information indicating the characteristics of HDR photoelectric conversion or the characteristics of HDR electro-optical conversion corresponding to the characteristics into the SEI NAL unit area of the video stream. The compatible receiver can appropriately perform electro-optical conversion processing on HDR transmission video data based on this HDR conversion characteristic meta information (see FIGS. 5 and 7).

10... Transmission/reception system 100... Transmitting device 101... Control section 102... SDR photoelectric conversion section 103... HDR photoelectric conversion section 104... Video encoder 104b. 104e... Encoding unit 105... System encoder 106... Transmitting unit 200, 300... Receiving device 201, 301... Control unit 202, 302... Receiving unit 203, 303... System decoder 204,304...Video decoder 204b...Decoding section 205...SDR electro-optical conversion section 206...SDR display mapping section 207,307...CE monitor 304b. 304e...Decoding section 305...HDR electro-optical conversion section 306...HDR display mapping section

Claims (18)

Perform high dynamic range photoelectric conversion on high dynamic range video data to obtain high dynamic range transmission video data,
encoding the high dynamic range transmission video data and outputting a video stream containing the encoded high dynamic range transmission video data;
inserting conversion characteristic meta information into an SEI area and a VUI area of the video stream;
inserting peak luminance information into the video stream;
transmitting the video stream;
Equipped with a circuit,
The display brightness of the high dynamic range transmission video data is adjusted based on the peak brightness information, and the electro-optical conversion of the high dynamic range transmission video data includes the conversion characteristic meta information in the SEI area and the VUI area. When inserted, the conversion is performed based on the conversion characteristic meta information inserted in the area of the SEI ,
The circuit further includes:
Perform normal dynamic range photoelectric conversion on normal dynamic range video data to obtain normal dynamic range transmission video data,
performing predictive encoding on the normal dynamic range transmission video data to obtain a basic video stream containing the encoded normal dynamic range transmission video data;
performing predictive encoding on the high dynamic range transmission video data using the normal dynamic range transmission video data to obtain an extended video stream containing the encoded high dynamic range transmission video data;
inserting the conversion characteristic meta information into an area of SEI of the enhanced video stream;
A transmitting device that inserts normal dynamic range conversion characteristic meta information indicating characteristics of normal dynamic range photoelectric conversion into a VUI area of the basic video stream. The circuit further includes:
The transmitting device according to claim 1, wherein meta information for display control is inserted into an SEI area of the extended video stream together with the conversion characteristic meta information. The transmitting device according to claim 2 , wherein the meta information for display control includes the peak luminance information. The transmitting device according to claim 2 , wherein the meta information for display control includes area information indicating an area where brightness conversion is permitted. The transmitting device according to claim 1, wherein the conversion characteristic indicated by the conversion characteristic meta information is at least one of a photoelectric conversion characteristic and an electro-optical conversion characteristic. Perform high dynamic range photoelectric conversion on high dynamic range video data to obtain high dynamic range transmission video data,
encoding the high dynamic range transmission video data and outputting a video stream containing the encoded high dynamic range transmission video data;
inserting conversion characteristic meta information into an SEI area and a VUI area of the video stream;
inserting peak luminance information into the video stream;
transmitting the video stream;
The display brightness of the high dynamic range transmission video data is adjusted based on the peak brightness information, and the electro-optical conversion of the high dynamic range transmission video data includes the conversion characteristic meta information in the SEI area and the VUI area. When inserted, the conversion is performed based on the conversion characteristic meta information inserted in the area of the SEI ,
moreover,
Perform normal dynamic range photoelectric conversion on normal dynamic range video data to obtain normal dynamic range transmission video data,
performing predictive encoding on the normal dynamic range transmission video data to obtain a basic video stream containing the encoded normal dynamic range transmission video data;
predictively encoding the high dynamic range transmission video data using the normal dynamic range transmission video data to obtain an extended video stream including the encoded high dynamic range transmission video data;
inserting the conversion characteristic meta information into an area of SEI of the enhanced video stream;
A transmission method comprising inserting normal dynamic range conversion characteristic meta information indicating characteristics of normal dynamic range photoelectric conversion into a VUI area of the basic video stream. The transmission method according to claim 6 , wherein the conversion characteristic indicated by the conversion characteristic meta information is at least one of a photoelectric conversion characteristic and an electro-optical conversion characteristic. receive a video stream,
decoding the video stream to obtain high dynamic range transmission video data;
the video stream includes transformation characteristic meta information and peak luminance information;
The conversion characteristic meta information is inserted into an SEI area and a VUI area of the video stream,
When the conversion characteristic meta information is inserted into the SEI area and the VUI area, high dynamic range is added to the high dynamic range transmission video data based on the conversion characteristic meta information inserted into the SEI area. Performs lightning conversion to obtain video data for display,
adjusting the display brightness of the high dynamic range transmission video data or the display video data based on the peak brightness information included in the video stream;
Equipped with a circuit ,
The video stream includes a basic video stream containing encoded normal dynamic range transmission video data obtained by performing predictive coding on the normal dynamic range transmission video data, and a basic video stream containing encoded normal dynamic range transmission video data obtained by performing predictive coding on the normal dynamic range transmission video data, An extended video stream containing encoded high dynamic range transmission video data obtained by performing predictive encoding using range transmission video data,
The circuit further decodes the basic video stream to obtain the normal dynamic range transmission video data, decodes the enhanced video stream to obtain the high dynamic range transmission video data,
The conversion characteristic meta information is included in an SEI area of the extended video stream . The receiving device according to claim 8 , further comprising a display device that displays an image corresponding to the display video data. The receiving device according to claim 8 , wherein the peak luminance information is included in an SEI area of the extended video stream. The circuit further acquires area information indicating an area where brightness conversion is allowed from the area of the SEI of the extended video stream, and displays the display in the area where brightness conversion is allowed based on the area information. The receiving device according to claim 10 , wherein the receiving device performs brightness adjustment. The receiving device according to claim 8 , wherein the high dynamic range electro-optical conversion and the display brightness adjustment are performed sequentially or simultaneously. The receiving device according to claim 8 , wherein the conversion characteristic indicated by the conversion characteristic meta information is at least one of a photoelectric conversion characteristic and an electro-optical conversion characteristic. receive a video stream,
decoding the video stream to obtain high dynamic range transmission video data;
the video stream includes transformation characteristic meta information and peak luminance information;
The conversion characteristic meta information is inserted into an SEI area and a VUI area of the video stream,
When the conversion characteristic meta information is inserted into the SEI area and the VUI area, high dynamic range is added to the high dynamic range transmission video data based on the conversion characteristic meta information inserted into the SEI area. Performs lightning conversion to obtain video data for display,
adjusting the display brightness of the high dynamic range transmission video data or the display video data based on the peak brightness information included in the video stream;
The video stream includes a basic video stream containing encoded normal dynamic range transmission video data obtained by performing predictive coding on normal dynamic range transmission video data, and a basic video stream containing encoded normal dynamic range transmission video data, and an extended video stream containing encoded high dynamic range transmission video data obtained by predictively encoding the high dynamic range transmission video data;
further decoding the basic video stream to obtain the normal dynamic range transmission video data; decoding the extended video stream to obtain the high dynamic range transmission video data;
The conversion characteristic meta information is included in an SEI area of the enhanced video stream . The receiving method according to claim 14 , further comprising displaying an image corresponding to the display video data on a display device. The receiving method according to claim 14 , wherein the peak luminance information is included in an SEI area of the extended video stream. Furthermore, area information indicating an area where brightness conversion is permitted is obtained from the area of the SEI of the extended video stream, and based on the area information, the display brightness is adjusted in the area where brightness conversion is permitted. The receiving method according to claim 14 . The receiving method according to claim 14 , wherein the conversion characteristic indicated by the conversion characteristic meta information is at least one of a photoelectric conversion characteristic and an electro-optical conversion characteristic.

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