JP2889480B2 - Video information playback control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video information reproduction control device, and more particularly, to a video information storage / reproduction center (storage device) for transmitting stored encoded video information to an audiovisual (AV) terminal. A video information reproduction control device that decodes the received AV terminal and reproduces it as a video, and that transmits the encoded image information stored in the center control device to the terminal, decodes the received terminal, and reproduces it as an image. About.

[0002]

2. Description of the Related Art In recent years, with the development and spread of digital transmission lines and the progress of image processing technology, the development of high-speed digital signal processing and LSI technology therefor has led to the development of ISDN.
(Integrated Services Digital Network) An effective use of video information services using high-speed digital communication lines as represented by integrated services digital networks is expected. Video telecommunication services, such as video telephony services and video conferencing services, are becoming more and more common. The service to do is expected. For this reason, in order to make it possible to mediate information to an unspecified number of users, information is stored in a storage (recording) device such as a host center or the like, and reproduction and reproduction to an unspecified number of AV terminals are performed. A system for controlling storage from a specific number of AV terminals is required. As one of the systems, there is a video information reproduction control device, which controls reproduction of video information from a host center or the like to an AV terminal.

In the conventional video information reproduction control device, when transmitting the stored coded video information to the AV terminal, as shown in FIG. 9, the screen number of the stored video information is transmitted. It is sent as it is as the screen number.
According to the screen number, the AV terminal decodes and reproduces the encoded video information. Further, the video information communication service includes:
There are cases where different stored video information, such as a display screen as a conversation display for service guidance display or usage explanation, or another coded video information, is continuously transmitted and different video information is continuously reproduced. is there.

In addition, in the conventional stored image transmission apparatus, before the center control apparatus transfers the encoded image information to the terminal, the center controller performs negotiation on the decoding processing ability of the terminal, so that sufficient decoding processing ability is obtained. The encoded image information is transmitted only when it exists, and the image information stored together with the screen number is transmitted as it is.

[0005]

In the above-described conventional video information reproduction control device, the screen number (frame number) of the screen information (frame data) of the video information received by the AV terminal is described.
And the screen number of the stored coded video information is transmitted without any change. For example, as shown in FIG. 9, the screen number of the stored video information is “10, 12, 1”.
In the order of "5, 17 ...", the screen numbers of the video information to be transmitted are in the order of "10, 12, 15, 17 ...". However, such video information is displayed on the display screen or another video information. In the case of continuous playback after the above, the conventional video information reproduction control device transmits the screen number of the stored video information as it is, so that a screen number difference occurs at a break connecting different video information. .

For example, as shown in FIG. 9, when the display screen and the stored video information are made continuous, the linked screen numbers are “display screen (1)”, display screen (3), and display screen ( 5), video information (10), video information (12), video information (15)... ”, And are transmitted as they are. (5) ”and“ Video information (1
The screen intervals of “0)” are reproduced in the order of the screen numbers, and are not reproduced as continuous screen numbers. In the above example, the video information after the break is reproduced with a delay.

As described above, in the conventional video information reproduction control device, when a display screen or different video information is continuously transmitted, the screen of the final screen of the previous video information is placed before and after the screen of the different video information. The number and the screen number of the first screen of the subsequent video information are not consecutive, and there is a problem that a delay occurs between the previous video information and the rear video information when the AV video is reproduced on the AV terminal.

Further, in the above-mentioned conventional stored image transmission apparatus, the terminal performs a negotiation on the decoding processing capability of the terminal, and the terminal does not have a sufficient decoding processing capability with respect to the stored coded image information. In other words, if the minimum screen interval that the terminal can decode is larger than the screen interval of the stored encoded image information, that is, if TTC
Based on an encoding system based on the standard JT-H261 (CCITT recommendation H.261), image information encoded at a screen interval of 1 / 29.97 seconds (hereinafter referred to as 1/30 seconds) is stored. If the minimum screen interval that can be decoded is 2 / 29.9
The screen number (frame number) of the screen information (frame data) received by the terminal, which is 7 seconds (hereinafter referred to as 2/30 seconds), is “0, 1, 2, 3,. , But not in the order of "0, 2, 4, 6, ...", the center control device transmits the stored coded image information to the terminal as it is. Can not.

Further, if the center control device transmits the stored information first by transmitting only the odd-numbered frames such as frame 1, then frame 3, then frame 5,... 0, 2, 4, 6,... ”, The terminal receives all the frame information because the information of each frame is closely associated with the information of the preceding and succeeding frames and encoded. Otherwise, a normal image cannot be reproduced. As described above, the conventional apparatus has a problem that a terminal having insufficient decoding processing capability cannot communicate with the center control device.

The present invention has been made in view of such circumstances, and when reproducing different video information, the encoded video information is read from a storage device storing the encoded video information, and the different encoded video information is read. When transmitting continuously, the screen number of the screen between the screens of different video information is set to a continuous screen number and transmitted, so that the video information due to the difference of the screen number between the screens of the different image information can be transmitted. Removing delays and decoding video information continuously;
By the encoded image information stored in the center control device,
It is an object of the present invention to provide a video information reproduction control device that enables a terminal having low decoding processing capability to perform communication by slow reproduction of an image in stored image transmission in which image transmission is performed.

[0011]

According to the present invention, in order to achieve the above object, (1) when performing a video information communication service, a storage device (recording device) storing coded video information is A video information reading unit, a display screen reading unit, and a display unit for transmitting the coded video information to an audiovisual terminal (hereinafter, referred to as an AV terminal) for decoding the coded video information and reproducing the coded video information as a video. In the video information reproduction control device configured by a line control unit, when transmitting the encoded video information to the audiovisual terminal, a screen number rewriting control unit that instructs the rewriting of the screen number representing the sequence number of the video information, A transmission frame processing unit that rewrites the screen number of the encoded video information to create the encoded video information based on an instruction from the screen number rewriting control unit. When transmitting the stored coded video information to the audiovisual terminal following the different video information, the screen number of the video information is rewritten and transmitted to the audiovisual terminal for reproducing the video. Eliminating the delay due to the difference between the screen numbers of the screens at the time of the reproduction of the video information, to guarantee the reproduction of the continuous video information, or (2) to provide the image communication service by the accumulated encoded image information. In a video information reproduction control device that performs stored image transmission, the encoded image information is stored in a terminal for storing encoded image information, decoding the encoded image information, and reproducing the image as an image. A center control device for transmitting
When the center control device transmits the encoded image information to the terminal, a screen number rewriting control unit that instructs a rewriting of a screen number representing a sequence number of the screen information, and the stored encoded image information Reading, based on an instruction from the screen number rewriting control unit, a transmission frame processing unit that creates encoded image information for transmitting a screen number to the rewriting terminal, and a terminal capability management unit that manages the decoding processing capability of the terminal. When the minimum reproducible screen interval of the image playback terminal is larger than the screen interval of the stored encoded image information, the screen number of the stored encoded image information is rewritten and transmitted. Thus, communication is enabled by slow reproduction of an image on the terminal.

[0012]

The video information reproduction control device according to the present invention has a screen number rewriting control means, which transmits different coded video information to the AV terminal when transmitting the stored coded video information to the AV terminal. The AV terminal receives the coded video information with the rewritten screen number in order to rewrite the screen number of the screen number break of the screen number and to rewrite while retaining the difference between subsequent screen numbers in the same video information. In addition, it is possible to reproduce different continuous images without any delay at a break. Further, when transmitting the stored encoded image information to the terminal, the terminal is rewritten in order to rewrite the screen number of the stored encoded image information according to the decoding processing capability of the terminal. Encoded image information with a screen number can be received.

[0013]

Embodiments will be described below with reference to the drawings. FIG. 1 is a configuration diagram for explaining an embodiment of a video information reproduction control device according to the present invention. In the drawing, 11 is a video information reading unit, 12 is a display screen reading unit, 13 is a screen number rewriting control unit, 14 is a transmission frame processing unit, 15
Is a line control unit.

[0014] The video information reading section 11 complies with TTC standard J
The video information encoded based on the encoding method based on T-H261 (CCITT recommendation H.261) is read from the storage device. The display screen reading unit 12 reads out a display screen as a conversation screen such as a service guidance display or a usage explanation. The screen number rewriting control unit 13 issues a screen number rewriting instruction when transmitting the encoded information stored in the storage device to the AV terminal 24-1. Transmission frame processing unit 14
Is a video information reading unit 11 and a display screen reading unit 12
The screen number (frame number) is rewritten based on the instruction from the screen number rewriting control unit 13 for the encoded video information read from the, and transmission screen information (transmission frame) is created. The line control unit 15 transmits the created transmission frame to the AV terminal 24-1 via the communication line 23.

FIG. 2 is a diagram for explaining an example of the configuration of a video information reproduction control device according to the present invention and another device. In the figure, reference numeral 21 denotes a storage device, 22 denotes a video information reproduction control device,
3 is a communication line, 24-1 to 24-n are audiovisual (AV) terminals, and 25 is a center control device. The storage device 21 stores (records) the encoded video information. The video information reproduction control device 22 to which the present invention is applied reads out coded video information and a display screen and transmits the read video information and the display screen to the AV terminal 24-1. The center control device 25 includes a storage device 21 and a video information reproduction control device 22. Communication line 2
Reference numeral 3 denotes a line such as a public network or a dedicated line. AV terminal 24
-1 to 24-n correspond to the video information reproduction control device 22 and the communication line 2
3 for receiving encoded video information stored in the storage device 21 and playing back the video as video.

FIGS. 3A and 3B show the TTC standard JT-2.
FIG. 3 is a diagram showing a relationship between a frame in a storage device storing video information to be coded and a screen number (frame number) based on a coding method conforming to 61.
3A shows the video information 1 and FIG. 3B shows the video information 2. Each frame is assigned a continuous screen number (frame number).

FIG. 4 shows the screen number (frame number) of the video information to be transmitted and the stored video when successively transmitting different video information encoded and stored in the storage device to the AV terminal. FIG. 9 is a diagram illustrating a relationship between information and a screen number (frame number). An example in which the video information reproduction control device and the AV terminal communicate will be described below.

The video information reproduction control device 22 is connected to the AV terminal 2
When the communication start request is received from 4-1, the coded video information stored in the storage device 21 is transmitted to the AV terminal 24-1.
Send to At this time, the first video information read out is read in the transmission frame processing unit 14 in the order of the screen number, as shown in FIG. The data is transmitted to the communication line 23 via the line control unit 15 without being performed. The AV terminal 24-1 that has received the encoded video information reproduces the video in the order of the screen numbers.

Next, when different video information is successively read, the video information reproduction control device 22 sends the encoded video information stored in the storage device 21 to the AV terminal 24-1. Is transmitted as it is, when the AV terminal 24-1 reproduces it, it plays back with the stored image numbers on the screens of different video information, and as shown in FIG. Delay occurs, and continuous smooth video cannot be reproduced. Therefore, when transmitting the screen number of the video information stored in the storage device 21 to the AV terminal 24-1, the screen number rewriting control unit 13 issues an instruction for rewriting the screen number as shown in FIG. To the transmission frame processing unit 14.

That is, the video information to be transmitted first is as shown in FIG.
The screen number is the same as that of video 1 (display screen) of the stored video information, and is transmitted to the AV terminal 24-1 via the line control unit 15 without rewriting the screen number. Next, the video information reading unit 11 stores the video 2 shown in FIG.
The screen number rewriting control unit 13 reads out the screen number from “1” and transmits it as the second video information.
To the transmission frame processing unit 14 so as to rewrite the data into "7", and the AV terminal 24-1 via the line control unit 15.
And successively, as shown in FIG. 4, the subsequent screen numbers in the same video information are "12" to "9", and "15" to "1".
.. Are rewritten as 2 ′,. The same applies to the subsequent different video information, in which the screen numbers of the stored frames are sequentially rewritten and transmitted. As a result, as shown in FIG. 5, a smooth continuous video without delay can be reproduced at a break of different video information.

As described above, according to the present invention, when the coded video information stored in the video information reproduction control device is transmitted to the AV terminal, the screen number rewriting control unit for rewriting the screen number is provided. On the screen at the break, the screen number is rewritten to a continuous screen number, and continuous reproduction of different video information independent of the screen number at the time of accumulation is achieved.

That is, an AV that reads encoded video information from a storage device in which the encoded video information is stored, and performs a decoding process to reproduce the video.
A terminal is connected via a communication line. The video information reproduction control device has a screen number rewriting control unit that instructs rewriting of a screen number according to different video information when transmitting the encoded video information stored in the storage device to the AV terminal, By transmitting the screen numbers of the screens between the screens of different video information with continuous screen numbers,
When the terminal reproduces the video information, it is possible to eliminate the delay of the video information due to the difference in the screen number between the screens of different image information, and to continuously decode the video information.

FIG. 6 is a block diagram of the center control device in FIG. 2. In FIG. 6, 31 is a video information storage unit, 32 is a terminal capability management unit, 33 is a screen number rewriting control unit, 34 is a transmission frame processing unit, Reference numeral 35 denotes a line control unit, and the other parts having the same functions as in FIG. 2 are denoted by the same reference numerals.

The video information accumulating section 31 is a TTC standard JT-
This is for accumulating coded video information based on a coding method conforming to H261 (CCITT Recommendation H.261). The terminal capability management unit 32 manages the decoding processing capability of the terminal that receives the encoded video information and reproduces the video. The screen number rewriting control unit 33 includes the video information storage unit 3
A screen number rewriting instruction for transmitting the coded information stored in No. 1 to the terminal is performed. The transmission frame processing unit 34
Reads information stored in the video information storage unit 31,
Based on an instruction from the screen number rewriting control unit, the screen number (frame number) is rewritten to create transmission screen information (transmission frame). The line controller 35 transmits the created transmission frame to the terminal via the communication line 23.

FIG. 7 shows the TTC standard J as shown in FIG.
A video information storage unit 31 that stores video information encoded at a screen interval of about 1 / 29.97 seconds (hereinafter referred to as 1/30 seconds) based on an encoding method based on T-H261.
It is a figure which shows the relationship between the frame in (1) and a screen number (frame number), and a continuous screen number (frame number) is given to each frame.

FIG. 8 shows that, as shown in FIG. 7, the minimum screen interval at which the video information coded in the video information storage unit can be decoded is about 2 / 29.97 seconds (hereinafter 2/30 seconds). FIG. 7 is a diagram showing a relationship between a screen number (frame number) of a transmission frame and a screen number (frame number) of a stored frame when transmitting to a terminal having a processing capability of (described).

Next, an example in which the center control device 25 and the terminal 24-1 communicate will be described below. When the center control device 25 receives the request to start communication from the terminal 24-1, the center control device 25 transmits the encoded information stored in the video information storage unit 31 to the terminal capability management unit before transmitting it to the terminal 24-1. 3
At 2, the user checks the decoding processing capability of the terminal 24-1. As a result, the screen interval of the stored encoded information becomes 1/30.
Second, the minimum screen interval that can be decoded by the terminal 24-1 is also 1/30 second, and when the decoding processing capability of the terminal for the screen interval of the accumulated coded video information is sufficient. As shown in FIG. 7, the transmission frame processing unit 34 reads out the encoded video information stored in the video information storage unit 31 in the order of the screen number, and passes the processing via the line control unit 35 without processing. To the communication line 23. The terminal that has received the encoded video information has a screen interval of 1
Plays back images in / 30 seconds.

On the other hand, if the minimum screen interval that can be decoded by the terminal 24-1 is 2/30 seconds, the center control device 25
Even if the encoded video information stored in the video information storage unit 31 is transmitted to the terminal 24-1 as it is, it cannot be reproduced by the terminal 24-1. When transmitting the frame stored in the storage unit 31 to the terminal, an instruction to rewrite the screen number as shown in FIG. 8 is given to the transmission frame processing unit. That is, the first frame to be transmitted is the same as the frame 1 of the stored video information in FIG. 7, and is transmitted to the terminal 24-1 via the line control unit 35 without rewriting the screen number.

Next, the transmission frame processing unit 34 reads the frame 2 shown in FIG. 7 from the video information storage unit 31 and transmits the frame 2 as the second transmission frame. Number “1” to “2”
And instructs the transmission frame processing unit 32 to rewrite the data to the terminal 24-1 via the line control unit 35.
Next, the video information storage unit 31 is set as the third transmission frame.
In order to transmit the frame 3 stored in the frame number, the screen number is rewritten from “2” to “4” as in the case of the frame 2 and transmitted. For subsequent transmission frames, transmission is performed by sequentially rewriting the screen numbers of the stored frames.

In the above-described example, it is assumed that the minimum screen interval that can be decoded by the terminal is 2/30 seconds and is half the screen interval of the information stored in the video information storage unit 31 of the center control device. However, the minimum screen interval that the terminal can decode is 3
/ 30 seconds (3 / 29.97 seconds as a standard), the first transmission frame transmits the frame 1 of the stored information as it is, but the second and third transmission frames are the video information storage unit 31 respectively. The screen numbers of frame 2 and frame 3 stored in “1” are rewritten to “3” and “6”, respectively, and transmitted. The screen numbers are similarly rewritten and transmitted for the subsequent frames.

Similarly, when the minimum screen interval at which the terminal can decode is 4/30 seconds (4 / 29.97 seconds as a standard),
As the first transmission frame, the frame 1 of the video information storage unit 31 is transmitted as it is, but the second and third transmission frames have the frame numbers of “4” and “3”, respectively, of the stored information, frames 2 and 3. Rewrite to '8' and send.

As described above, according to the present invention, when the encoded video information stored in the center control device is transmitted to the terminal, the screen number rewriting control unit for rewriting the screen number is provided according to the decoding processing capability of the terminal. Then, the screen number of the stored encoded video information is rewritten and transmitted to the terminal.

A center control device in which encoded video information is stored, and a terminal that receives the encoded video information and performs video decoding to reproduce the video are connected via a communication line. You. The center control device has a terminal capability management unit that manages the decoding processing capability of the terminal and, when transmitting the video information stored in the center control device to the terminal, changes the screen number according to the decoding processing capability of the terminal. And a screen number rewriting control unit for instructing rewriting by transmitting the coded image information with the rewritten screen number to a terminal having a low decoding processing capability, and the terminal reproduces the image as a slow video to communicate. Will be possible.

[0034]

As is apparent from the above description, the present invention has the following effects. (1) Effects corresponding to claim 1: According to the stored video reproduction control device according to the present invention, the screen numbers of frames of video information that have been encoded and stored are rewritten, and a break between screens of different video information is performed. By transmitting the screen numbers of the screens in a continuous screen number, when the AV terminal reproduces the video information, the delay of the video information due to the difference in the screen number between the screens of different video information is eliminated, Video information can be decoded continuously. (2) Effect corresponding to claim 2: According to the stored image transmission apparatus according to the present invention, even a terminal having a minimum decodable screen interval larger than that of coded and stored video information can be used. Since the frame screen number is rewritten and transmitted, slow reproduction of images at screen intervals according to the decoding processing capability of the terminal enables communication regardless of the decoding processing capability of the terminal.

[Brief description of the drawings]

FIG. 1 is a configuration diagram for explaining an embodiment of a video information reproduction control device according to the present invention.

FIG. 2 is a configuration diagram of a video information reproduction control device according to the present invention and another device.

FIG. 3 is an explanatory diagram showing a relationship between a screen number of video information transmitted by the video information reproduction control device according to the present invention and a screen number of accumulated video information.

FIG. 4 is an explanatory diagram (part 1) illustrating a relationship between a screen number of video information transmitted by the video information reproduction control device according to the present invention and a screen number of accumulated video information.

FIG. 5 is an explanatory diagram (part 2) illustrating a relationship between video information transmitted by the video information reproduction control device according to the present invention and video information obtained by reproducing the video information.

FIG. 6 is a configuration diagram of a center control device in FIG. 2;

FIG. 7 is a diagram illustrating a state of information stored in a video information storage unit according to the present invention.

FIG. 8 is a diagram illustrating an example of a transmission frame in FIG. 7;

FIG. 9 is an explanatory diagram showing a relationship between video information transmitted by a conventional video information reproduction control device and reproduced video information.

[Explanation of symbols]

11: video information readout unit, 12: display screen readout unit, 13: screen number rewrite control unit, 14: transmission frame processing unit, 15: line control unit, 21: storage device, 22 ...
Video information reproduction control device, 23 ... communication line, 24-1 to 24
-n: video playback AV terminal, 25: center control device, 31 ...
Video information storage unit, 32: Terminal capability management unit, 33: Screen number rewriting control unit, 34: Transmission frame processing unit, 35 ...
Line control unit.

Continued on the front page (72) Inventor Keiichi Hibi 22-22 Nagaikecho, Abeno-ku, Osaka-shi, Osaka Inside Sharp Corporation (72) Inventor Tsuneaki Iwano 22-22 Nagaikecho, Abeno-ku, Osaka-shi, Osaka Sharp Corporation ( 72) Inventor Hirotaka Nakano 1-6, Uchisaiwaicho, Chiyoda-ku, Tokyo Nippon Telegraph and Telephone Corporation (72) Inventor Osamu Nakamura 1-6-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Nippon Telegraph and Telephone Corporation (56) References JP-A-63-279371 (JP, A) JP-A-62-200422 (JP, A) JP-A-63-197213 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) ) H04N 7/14

Claims (2)

(57) [Claims] When performing a video information communication service, the encoded video information is transmitted from a storage device storing the encoded video information to an audio-visual terminal for decoding the encoded video information and reproducing the encoded video information as a video. In order to transmit information, a video information readout unit, a display screen readout unit, and a video information reproduction control device including a line control unit, when transmitting the encoded video information to an audiovisual terminal, A screen number rewriting control unit for instructing rewriting of a screen number representing an information sequence number, and, based on an instruction from the screen number rewriting control unit, rewriting a screen number of the encoded video information to create encoded video information. With a transmission frame processing unit, following different video information,
When transmitting the stored coded video information to the audiovisual terminal, the screen number of the video information is rewritten and transmitted to the audiovisual terminal that reproduces the video, so that the video data is reproduced at a different video information. A video information reproduction control device which eliminates a delay caused by a difference between screen numbers of the screens and guarantees reproduction of continuous video information. 2. A video information reproduction control device for transmitting a stored image in order to provide an image communication service using the stored coded image information, wherein the coded image information is stored in the video information reproduction control device. And a center control device for transmitting the encoded image information to a terminal for reproducing as an image. When the center control device transmits the encoded image information to the terminal, A screen number rewriting control unit for instructing rewriting of a screen number representing an order number, reading out the stored encoded image information, and transmitting a screen number to a rewriting terminal based on an instruction from the screen number rewriting control unit A transmission frame processing unit that creates encoded image information; and a terminal capability management unit that manages the decoding processing capability of the terminal. When the minimum reproducible screen interval of the image reproducing terminal is larger than the interval, the terminal rewrites and transmits the screen number of the stored encoded image information, thereby performing slow reproduction of an image on the terminal to perform communication. A video information reproduction control device characterized in that: