JP2001054140A - Stereo video band compression encoding method, decoding method, and recording medium - Google Patents

Abstract

(57) [Summary] [Problem] A method of synchronizing stereo video frames in encoding and decoding for band compression processing capable of expressing with a smaller amount of information than when individual stereo video signals are individually compressed Clarify. SOLUTION: Encoding processing using one of a plurality of video signals alone or in combination using an intra-screen correlation, a correlation in a time axis direction, or a bias in code appearance rate is performed. In other words, the band-compressed main compressed signal, the one of the plurality of video signals, and the other one of the plurality of video signals are correlated with each other using the inter-frame code. The sub-compressed signal that is double-compressed by performing coding processing using the correlation within the screen, the correlation in the time axis direction, or the coding using the bias of the code appearance rate alone or in combination And, when encoding the video signal, adding a video frame number to each band-compressed encoded data.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a process of transmitting a stereo video signal by band compression and decoding the stereo video signal, and more particularly to synchronization of a stereo video frame.

[0002]

2. Description of the Related Art For example, when a stereo audio signal is band-compressed and transmitted, Lch (left channel) and Rch
(Right channel) signals are band-compressed individually. Similarly, when a stereo video signal is transmitted after being band-compressed, the signal of each channel is band-compressed individually.

[0003] Here, a stereo video signal is defined as a stereoscopic effect (feeling that an image has depth) by separately presenting two types of two-dimensional images having binocular parallax to the left and right eyes separately and stereoscopically viewing them. ) And depth (Sensation)
of Depth). In other words, a human can also feel a stereoscopic effect and a sense of depth by watching videos at different times obtained from the left and right eyes at the same time. If the shift amount of the image given to the right and left eyes is within a certain range, these appear as one image instead of a double image, and a three-dimensional effect and a sense of depth can be obtained by the shift amount. Since the left and right eyes are far from each other, the images of the retinas of both eyes when seeing a certain object are not the same, and generally a shift occurs at a position far from the gazing point. Such a difference in the amount of displacement between the two eyes is called binocular parallax.

The right and left images have a very strong correlation and are suitable for band compression.

[0005]

When a stereo signal is band-compressed individually, it may not be compressed enough to be covered by a one-channel transmission path. In such a case,
Prepare monaural signal transmission, prepare high-speed transmission path,
Further, it is necessary to take measures to prepare two-channel transmission paths. Attempts have been made to use a compression technique capable of expressing a stereo video signal with a smaller amount of information, but no consideration has been given to the synchronization of video frames.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has been made in a band compression process capable of expressing a stereo video signal with a smaller amount of information than when the left and right channels are individually compressed. To clarify a method of synchronizing stereo video frames in encoding and decoding for encoding.

[0007]

SUMMARY OF THE INVENTION The present invention is to transmit a frame number for synchronizing a stereo video frame in encoding and decoding of a stereo video signal, or to use time management information of reproduction output. In the claims, “time management information of reproduction output” is information relating to a presentation time stamp indicating the presentation time of the decoded data, and corresponds to PTS (presentation time stamp) information in the case of MPEG2, for example. Details will be described below.

(1) The invention according to claim 1 is a stereo video band compression encoding method for band-compressing a plurality of video signals in parallel, wherein any one of the plurality of video signals is independently displayed on a screen. A main encoding step of performing single or combined encoding using the correlation of the correlation or the correlation in the time axis direction or the bias of the code appearance rate, and performing band compression to generate a main compressed signal; The other one video signal is encoded using the correlation between one video signal and the other one video signal of the plurality of video signals, and then the correlation within the screen, the correlation in the time axis direction Or a sub-encoding step of generating a double-compressed sub-compressed signal by performing encoding using the bias of the appearance rate of the code alone or in combination, and Any one alone in the screen When the main encoding is performed using the correlation, the correlation in the time axis direction, or the bias of the code appearance rate, the correlation between any one of the video signals and the other one of the plurality of video signals When sub-encoding the other one video signal using the relationship, video frame number information that can identify the reproduction order of the video frames is added to each of the band-compressed main compressed signal and sub-compressed signal. And transmitting the compressed video signal together with the compressed video signal. According to this stereo video band compression encoding method, when stereo video is band-compressed and transmitted, video frame number information can be added to band-compressed video data and transmitted.

(2) The invention according to claim 2 is a stereo video band compression decoding method for decoding a plurality of band-compressed video signals in parallel. A main decoder that decodes a main compressed signal that can be decoded independently, that is, information that has been subjected to coding processing alone or in combination using a correlation, a correlation in a time axis direction, or a bias in code appearance rate. Decoding step and, among the plurality of video signals, first, information obtained by performing coding processing by using alone or in combination the correlation using the correlation in the screen, the correlation in the time axis direction, or the bias of the code appearance rate. Independently decoding, after that, further decoding by referring to the information obtained by decoding the main compressed signal, a sub-decoding step of decoding a signal that has been double-compressed processing,
In the main decoding step, when decoding the main compressed signal, video frame number information given to the main compressed signal is stored together with the decoded video signal, and at least reference information of the sub-decoding step is stored. In the sub-decoding step,
Of the plurality of video signals, first the information in the screen, the encoding processing using the bias of the correlation in the time axis direction or the bias of the code appearance rate alone or in combination, decodes the encoded information independently, Thereafter, in order to perform sub-decoding with reference to the video signal obtained by decoding the main compressed signal, the video frame number information of the frame being decoded in the sub-decoding step and the same video frame number information A stereo video band compression / decoding method characterized by performing inter-frame decoding with the video signal of the main decoding end and decoding a signal that has been double-compressed. According to this stereo video band compression / decoding method, when decoding a stereo video, a target frame can be determined and decoded with reference to video frame number information.

(3) The invention according to claim 3 is a stereo video band compression decoding method for decoding a plurality of band-compressed video signals in parallel. A main decoder that decodes a main compressed signal that can be decoded independently, that is, information that has been subjected to coding processing alone or in combination using a correlation, a correlation in a time axis direction, or a bias in code appearance rate. Decoding step and, among the plurality of video signals, first, information obtained by performing coding processing by using alone or in combination the correlation using the correlation in the screen, the correlation in the time axis direction, or the bias of the code appearance rate. Independently decoding, after that, further decoding by referring to the information obtained by decoding the main compressed signal, a sub-decoding step of decoding a signal that has been double-compressed processing,
In the main decoding step, when decoding the main compressed signal, the time management information of the reproduction output added to the main compressed signal is stored together with the decoded video signal, and at least the sub decoding step is performed. The reference information, the sub-decoding step, among the plurality of video signals, first using the correlation using the correlation in the screen, the correlation in the time axis direction or the bias of the code appearance rate alone or in combination The encoded information is decoded alone, and then the sub-decoding step is performed in order to perform sub-decoding with reference to the video signal obtained by decoding the main compressed signal. Inter-frame decoding is performed between the time management information of the playback output and the video signal of the main decoding corner of the time management information of the playback output having the same or close value, and the signal that has been double-compressed is decoded. ,thing A stereo image bandwidth compression decoding method characterized by decoding the more MPEG2 transport stream corresponding information. According to the stereo video band compression / decoding method, when decoding a stereo video, a target frame can be determined and decoded by referring to the time management information of the reproduction output.

(4) A stereo video band compression / coding processing program for executing a stereo video band compression / coding method for band-compressing a plurality of video signals in parallel. Either one of the signals is singly or combined using the correlation using the correlation in the screen, the correlation in the time axis direction, or the bias of the code appearance rate, and the band is compressed to compress the main compressed signal. Generating a main encoding step, encoding the other one of the video signals using a correlation between the one of the plurality of video signals and the other one of the plurality of video signals, and then screen A sub-encoding step of generating a double-compressed sub-compressed signal by performing encoding using the correlation in the time axis direction or the bias of the code appearance rate alone or in combination. To When the main encoding is performed using any one of the plurality of video signals alone by using the correlation in the screen, the correlation in the time axis direction, or the bias in the appearance rate of the code, When sub-encoding another video signal using a correlation between the video signal and another video signal of the plurality of video signals, video frame number information that can identify a reproduction order of video frames. Computer-readable recording medium recording a stereo video band compression encoding processing program, wherein a stereo video band compression encoding program is added to each band-compressed main compressed signal and sub-compressed signal and transmitted together with the compressed video signal. It is. According to the processing program recorded on this recording medium, when transmitting a stereo video with band compression, it is possible to add video frame number information to the band-compressed video data and transmit it.

(5) A stereo video band compression / encoding processing program for executing a stereo video band compression / decoding method for decoding a plurality of band-compressed video signals in parallel, Of the plurality of video signals, decoding using a correlation within a screen, a correlation in a time axis direction, or encoding using a bias of a code appearance rate alone or in combination, which is information obtained by performing encoding processing alone, can be independently performed. A main decoding step of decoding a possible main compressed signal, and, among the plurality of video signals, first, a coding using a correlation in a screen, a correlation in a time axis direction, or a bias in a code appearance rate. The information that has been coded alone or in combination is decoded independently, and then the decoding is further performed with reference to the information obtained by decoding the main compressed signal, to decode the double-compressed signal. And a sub-decoding step of performing decoding. In the main decoding step, when decoding the main compressed signal, the video frame number information assigned to the main compressed signal is stored together with the decoded video signal. In advance, at least the reference information of the sub-decoding step, in the sub-decoding step,
Of the plurality of video signals, first the information in the screen, the encoding processing using the bias of the correlation in the time axis direction or the bias of the code appearance rate alone or in combination, decodes the encoded information independently, Thereafter, in order to perform sub-decoding with reference to the video signal obtained by decoding the main compressed signal, the video frame number information of the frame being decoded in the sub-decoding step and the same video frame number information A computer readable recording of a stereo video band compression / decoding processing program, which performs inter-frame decoding with the video signal of the main decoding end and decodes a signal that has been double-compressed. Recording medium. According to the processing program recorded on this recording medium, when decoding a stereoscopic video, it is possible to determine and decode the target frame with reference to the video frame number information.

(6) A stereo video band compression / coding processing program for executing a stereo video band compression / decoding method for decoding a plurality of band-compressed video signals in parallel, Of the plurality of video signals, decoding using a correlation within a screen, a correlation in a time axis direction, or encoding using a bias of a code appearance rate alone or in combination, which is information obtained by performing encoding processing alone, can be independently performed. A main decoding step of decoding a possible main compressed signal, and, among the plurality of video signals, first, a coding using a correlation in a screen, a correlation in a time axis direction, or a bias in a code appearance rate. The information that has been coded alone or in combination is decoded independently, and then the decoding is further performed with reference to the information obtained by decoding the main compressed signal, to decode the double-compressed signal. Anda sub decoding step of performing reduction,
In the main decoding step, when decoding the main compressed signal, the time management information of the reproduction output added to the main compressed signal is stored together with the decoded video signal, and at least the sub decoding step is performed. The reference information, the sub-decoding step, among the plurality of video signals, first using the correlation using the correlation in the screen, the correlation in the time axis direction or the bias of the code appearance rate alone or in combination The encoded information is decoded alone, and then the sub-decoding step is performed in order to perform sub-decoding with reference to the video signal obtained by decoding the main compressed signal. Inter-frame decoding is performed between the time management information of the playback output and the video signal of the main decoding corner of the time management information of the playback output having the same or close value, and the signal that has been double-compressed is decoded. ,thing A computer readable recording medium recording a stereoscopic bandwidth compression decoding program characterized by decoding the more MPEG2 transport stream corresponding information. According to the compressed signal recorded on this recording medium, when decoding a stereo video, it is possible to determine and decode a target frame with reference to the time management information of the reproduction output.

(7) According to a seventh aspect of the present invention, any one of a plurality of video signals is coded independently using a correlation in a screen, a correlation in a time axis direction, or a bias in a code appearance rate. The main compression signal band-compressed by performing an encoding process alone or in combination, and any one of the video signals, using the correlation between the other video signal of the plurality of video signals, Inter-frame coding of another video signal, and then performing coding processing using the correlation in the screen, the correlation in the time axis direction, or the coding using the bias of the code appearance rate alone or in combination And a sub-compressed signal that has been double-compressed, and a data structure configured by adding video frame number information to each of the band-compressed main compressed signal and sub-compressed signal when encoding the video signal. No Leo video bandwidth compression signal is a computer readable recording medium having recorded. According to the compressed signal recorded on the recording medium, the reference when decoding the original stereo video signal based on the signal of less information amount than when the stereo video signal is band-compressed individually for each channel. The frame to be decoded can be determined and decoded.

In each of the above inventions, a plurality of video signals having a strong correlation are encoded in parallel (the correlation in the time axis direction for band compression, the correlation in the screen, and the bias of the code appearance rate are used. When performing one of the plurality of video signals, first, the other one of the plurality of video signals is used as reference data for performing inter-frame coding. In the stereo video compression in which the result obtained by performing the encoding is further encoded, an improvement in the frame synchronization at the time of inter-frame decoding at the time of decoding is realized.

[0016]

Embodiments of the present invention will be described below in detail. First, a description will be given with reference to FIG. 1 as a conceptual diagram showing an example of a transmission system according to the present invention.

The transmission system 10 shown in FIG. 1 includes an encoding device 20, a decoding device 140, and a communication line 260. The encoding device 20 includes input terminals 30, 80,
A / D units 40 and 90 and frame memory units 60 and 110
Encoding means 50, 10 including the encoding units 70, 120
0 and a communication unit 130.

The input terminal 30 is connected to the A / D unit 40 and outputs an externally input analog signal to the A / D unit 40.

The A / D unit 40 is interposed between the input terminal 30 and the encoding means 50, converts a signal input from the input terminal 30 from an analog signal to a digital signal, and outputs the signal to the encoding means 50.

The encoding means (main encoding means) 50 has an A /
A frame memory unit 60 and an encoding unit 70 are interposed between the D unit 40 and the communication unit 130. The frame memory unit 60 is interposed between the A / D unit 40 and the encoding unit 70, and is also connected to the encoding unit 120 of the encoding unit (sub-encoding unit (double encoding unit)) 100. You. The encoding unit 70 is interposed between the frame memory unit 60 and the communication unit 130. The frame memory unit 60 temporarily stores the number of frames required for the encoding process in order to use the information input from the A / D unit 40 as data for performing the encoding process. The encoding unit 70 reads information from the frame memory unit 60 and performs an encoding process to perform band compression based on the information stored in the frame memory unit 60.
The resulting band-compressed video signal is output to communication unit 130.

The input terminal 80 is connected to the A / D unit 90 and outputs an externally input analog signal to the A / D unit 90.

The A / D unit 90 is interposed between the input terminal 80 and the encoding unit 100, converts a signal input from the input terminal 80 from an analog signal to a digital signal, and outputs the signal to the encoding unit 100.

The encoding means (sub-encoding means (double encoding means)) 100 is interposed between the A / D section 90 and the communication section 130, and includes a frame memory section 110 and an encoding section 120.
It is composed of The frame memory unit 110 has an A / D
It is interposed between the unit 90 and the encoding unit 120. Encoding unit 1
Reference numeral 20 is interposed between the frame memory unit 110 and the communication unit 130 and connected to the frame memory unit 60. The frame memory unit 110 temporarily stores the number of frames required for the encoding process in order to use the information input from the A / D unit 90 as data for performing the encoding process.
The encoding unit 120 compresses the band based on the information stored in the frame memory unit 60 and the frame memory unit 110.
The information is read from 0 and an encoding process is performed. The resulting band-compressed video signal is output to communication unit 130.

The communication unit 130 includes the encoding units 50 and 100
And the communication line 260, the encoding means 50,
For example, the signal from the control unit 100 is multiplexed and output to an external decoding device. When the communication line 260 has a plurality of lines (channels), there is no need to multiplex.

The decoding device 140 includes a communication unit 150, decoding units 170 and 220, and frame memory units 180 and 23.
0 and the D / A unit 19
0, 240 and output terminals 200, 250.

The communication section 150 is interposed between the communication line 260 and the decoding means 160 and the decoding means 210, receives a signal from the external encoding device 20 from the communication line 260, and Output to the decoding means 210.

The decoding means (main decoding means) 160 is interposed between the communication section 150 and the D / A section 190, and comprises a decoding section 170 and a frame memory section 180. The decoding unit 170 is interposed between the communication unit 150 and the frame memory unit 180. Frame memory unit 180
Is interposed between the decoding unit 170 and the D / A unit 190, and is connected to the decoding unit 220 of the decoding unit (sub-decoding unit (double decoding unit)) 210. Decoding section 170 performs decoding based on information from communication section 150, and outputs the result to frame memory section 180. The frame memory unit 180 temporarily stores the information on the completion of the decoding process from the decoding unit 170 and outputs the information to the D / A unit 190.

D / A section 190 is interposed between decoding means 160 and output terminal 200, converts a digital signal from frame memory section 180 of decoding means 160 into an analog signal, and outputs the analog signal to output terminal 200. I do.

The output terminal 200 is connected to the D / A unit 190, and outputs a signal from the D / A unit 190 to the outside.

The decoding means (sub-decoding means (double decoding means)) 210 is interposed between the communication section 150 and the D / A section 240, and is connected to the decoding section 220 and the frame memory section 23.
0. The decryption unit 220 includes the communication unit 150
And the frame memory unit 230, and is connected to the frame memory unit 180. The frame memory unit 230 is interposed between the decoding unit 220 and the D / A unit 240. Decoding section 220 performs a decoding process based on the information from communication section 150 and the information in frame memory section 180, and outputs the result to frame memory section 230. Frame memory section 230 temporarily stores information indicating that the decoding processing from decoding section 220 has been completed, and outputs the information to D / A section 240.

D / A section 240 is interposed between decoding means 210 and output terminal 250, converts a digital signal from frame memory section 230 of decoding means 210 into an analog signal, and outputs the analog signal to output terminal 250. I do.

The output terminal 250 is connected to the D / A section 240 and outputs a signal from the D / A section 240 to the outside.

The video signal generally refers to a television signal of a normal resolution such as NTSC, PAL, or SECAM used in television broadcasting, or a high-resolution television signal such as an HDTV signal.
The description of the details of the video signal itself is omitted.

Further, in this embodiment, description will be made with a video signal composed of an analog television signal, but the present invention can also be applied to a digital television signal.

As a compression method for band compression,
In a natural image, the value between adjacent pixels is close, that is,
A method of performing information compression using a strong correlation within a screen (spatial), and a method of storing information of a screen before and after (past and future) temporally, and comparing the screen before and after recording the current screen The information compression method using the correlation in the time axis direction (between screens), and the information using the bias of the code appearance rate when encoding by the above two methods. There is a method of performing compression.

The standard of the method of band compression of a video signal is H.264. H.261, MPEG1, and MPEG2 are standardized by ISO / IEC JTC1 / SC2 (International Organization for Standardization / International Electrotechnical Commission Joint Technical Committee 1, Technical Subcommittee 2) and the like. Compression methods are the basis, and they are combined to increase compression efficiency. Therefore, a detailed description of the band compression method is omitted.

Further, the communication unit 130 of the encoding device 20
Also, the transmission between the communication unit 150 of the decoding device 140 and the communication unit 150 conforms to a recommendation such as an MPEG2 TS (transport stream) multiplexing method (recommendation H222). Therefore, even if the transmission data is delayed due to the transmission path, the communication unit, and other circuits, there is no problem in the decoding process. This is because, when the encoding process is performed and output from the communication unit, the TS multiplexing method of MPEG2 (recommended H22)
DTS and PTS information are added to comply with the recommendation of 2). The decoding side starts decoding based on the DTS information, and based on the PTS information,
30 and the TV output from the D / A units 190 and 240 to the outside.
It is displayed on a monitor or the like.

This DTS information is provided by Decoding Ti
It is me Stamp, which is time management information for decoding, and starts decoding processing based on this DTS information. PT
S information is Presentation Time St
amp, which is time management information for reproduction output,
Display is started based on the TS information. The DTS information of the data to be decoded by the decoding means 160 and the decoding means 210
The DTS information of the data to be decrypted is
The relationship is such that the 60 decoding processes are completed first. Therefore, the video signal 1 is stored in the temporary frame memory unit 180 after the decoding process is completed, and is stored until the display is started by the PTS information. At the same time, the decoding means 210
Is also read out for decoding the video signal 2.

Further, different PID (Packet Identification) information is given to each piece of information to be TS-multiplexed. This PID information is a packet identifier indicating an attribute of the TS multiplexed packet information. The decoding side can transmit the target information to the respective decoding means based on the PID information.

Here, the flowchart of FIG.
The present invention will be described with reference to FIGS. FIGS. 3 and 4 are diagrams showing video frames to be encoded according to the present invention over time. As described above, the video signal conveys a moving image by continuously transmitting a plurality of video frames.

The details of the present invention will be described below. The video signal 1 input to the input terminal 30 of the encoding device 20 (S1 in FIG. 2) is transmitted to the A / D unit 40 (S2 in FIG. 2).

The A / D section 40 converts a signal input from the input terminal 30 from an analog signal to a digital signal and outputs the digital signal to the encoding means 50.

The encoding unit 50 temporarily stores the information transmitted from the A / D unit 40 in the built-in frame memory unit 60 (S3 in FIG. 2) and outputs the information to the encoding unit 70 and the encoding unit 120. The encoding unit 70 performs reading and encoding to perform band compression based on the information stored in the frame memory unit 60 (S4 in FIG. 2). After that, a main compressed signal in which DTS information and PTS information are added to the encoded information is output to the communication unit 130.

At the same time, the video signal 2 input to the input terminal 80 of the encoding device 20 (S11 in FIG. 2) is transmitted to the A / D unit 90. The A / D unit 90 converts the signal input from the input terminal 80 from an analog signal to a digital signal (S12 in FIG. 2) and outputs the signal to the encoding unit 100.

The encoding means 100 temporarily stores the information transmitted from the A / D section 90 in the built-in frame memory section 110 (S13 in FIG. 2). The encoding unit 120 obtains the difference between the information in the frame memory unit 60 incorporated in the encoding unit 50 and the information stored in the frame memory unit 110, or obtains the difference from the frame memory unit incorporated in the encoding unit 50. Frame memory unit 110 based on the
To obtain a video signal 3 by performing inter-frame predictive encoding with the information stored in the. (Encoding process B) That is, the video signal 3 is a signal of only a different portion between the video signal 1 and the video signal 2. Furthermore, the conventional encoding of the video signal 3, that is, a method of performing information compression utilizing a strong correlation within a screen (spatial), and a method of temporally preceding and following (past and future) screen information A method of compressing information using a correlation in the time axis direction (between screens) by storing and expressing the current screen as a difference value between the screens before and after the recording, and a coding method using the above two methods In this case, information compression utilizing the bias of the code appearance rate is performed in combination, and compressed information, that is, a double compressed signal is generated (encoding processing A) and output to the communication unit 130. (FIG. 2S
14)

The communication unit 130 creates data conforming to MPEG2. As a method of assigning a frame number, for example, by setting 1 PES = 1 picture, information in the PES header, for example, an unused trick mode “101” is specified, and 5b immediately following the trick mode is set.
It is defined as a continuity counter (continuous counter), and a frame number can be assigned by incrementing the value of the continuity counter by one for each 1PES = 1 picture. The communication unit 130 receives the main compressed signal received from the encoding unit 50 and the
Different PID information from the received double-compressed signal and a frame number to each video data, and the external decoding device 140
Output to (S5 and S15 in FIG. 2) When the continuity counter is used with 5 bits, the continuity counter increases from “0” to “1F”, returns to “0” after “1F”, and then increases. Is what you do.

The above description is the stereo video band compression coding method and the processing procedure of the stereo video coding processing program.

On the other hand, the communication unit 150 of the decryption device 140
Outputs the information of the video signal 1 (main compressed signal) received from the communication line 260 to the decoding means 160 and outputs the information of the video signal 3 (double compressed signal) to the decoding means 210. At this time, the information of the video signal 1 and the information of the video signal 3 are PI
D is determined based on the D information, and is output to each decoding unit.

The decoding means 160 converts the information of the video signal 1 transmitted from the communication section 150 into a DTS
A decoding process is performed based on the information (S7 in FIG. 2). The decoding process at this time includes a method of performing information compression utilizing a strong correlation within a screen (spatial) and a method of storing screen information before and after (past and future) in time, and By expressing the screen with a difference value between the screen before and after the recording, the information is compressed using the correlation in the time axis direction (between the screens). This is a decoding process for information encoded by a method of a combination of methods of performing information compression using the bias of the appearance rate. Next, the video information and the frame number information or the PTS information for which the decoding process has been completed are output to the frame memory unit 180 and temporarily stored (S8 in FIG. 2). The decoded video information and the frame number information or PTS information are information when transmitted and correspond one-to-one.

The frame memory section 180 includes a decoding section 170
Is stored for the number of frames required for the decoding process, and is output to the D / A unit 190 when the time indicated by the PTS information for the video signal 1 has come.

The D / A section 190 converts the digital signal received from the frame memory section 180 of the decoding means 160 into an analog signal (S9 in FIG. 2) and outputs it to the output terminal 200.

Then, the video signal 1 is output from the output terminal 200.
Is output (S10 in FIG. 2).

At the same time, the decoding means 210
The decoding unit 220 performs a first decoding process on the information of the video signal 3 transmitted from the
Is decrypted. The first decoding process at this time includes a method of performing information compression using a strong correlation in a screen (spatial) and a method of storing information of a screen before and after (past and future) in time. In addition, when the current screen is represented by a difference value between the previous and next screens before and after the recording, the information compression using the correlation in the time axis direction (between the screens) is performed. This is a decoding process for information encoded by a method of combining information compression using a bias in the code appearance rate. (Decoding Process A) Next, in the second decoding process, the frame number or PTS information is read from the frame memory unit 180 of the decoding unit 160, and the decoding unit 220 compares the frame number or the PTS information with the frame number or PTS information being decoded. Then, the video information to which the PTS information of the same frame number or the closest time is added is determined. Frame memory section 180 of decoding means 160
The determined video information of the video signal 1 which has been decoded from the video signal 1 and the video signal 3 being decoded by the decoding unit 220
, And the decoding into the video signal 2 is completed. (S17 in FIG. 2) The signal of the video signal 2 after the completion of the second decoding process is output to the frame memory unit 230 and temporarily stored in the frame memory unit (S18 in FIG. 2).

The frame memory unit 230 includes a decoding unit 220
, And outputs the information to the D / A section 240 when the time indicated by the PTS information for the video signal 2 has been reached.

The D / A section 240 converts the digital signal received from the frame memory section 230 of the decoding means 210 into an analog signal (S19 in FIG. 2) and outputs it to the output terminal 250.

Then, the video signal 2 is output from the output terminal 250.
Is output (S20 in FIG. 2).

The above is the stereo video band compression / decoding method and the processing procedure of the stereo video decoding processing program.

The relationship between the PTS information and the DTS information is that, for example, in the case of NTSC, about 30 frames of video are displayed per second. In this case, the encoding means 50, 100
The PTS information and DTS information added by
It is only necessary to add PTS information that considers the time that the decoding process is completed on the 0 and 210 sides or longer. Therefore, the specific contents of the PTS information and the DTS information are as follows in the case of NTSC.

Considering, for example, that the n-th frame of the video signal is band-compressed and transmitted, the decoding process performed by the decoding units 170 and 210 must be completed within at least about 33 msec. Must. This is because after about 33 msec, the information of the next (n + 1) th frame must be decoded and output. That is, the decoding process performed by the decoding unit 220 may be completed within about 33 msec until the first decoding process is completed and then the second decoding process is completed. However, the decoding process of the video signal 1 must be completed before the inter-frame decoding process between the information of the video signal 1 and the video signal 3 when the video signal 2 is decoded.

As described above, the band compression efficiency when transmitting the video signal 2 is improved, and the amount of information required for transmission can be smaller than the amount of information of the video signal 1.

The n-th frame of the video signal 1 and the n-th frame of the video signal 2 input to the encoding device 20 are about 1/30 second = 33 msec in the case of NTSC.
, And can be said to be video signals at approximately the same time.

Although the input video signal is an analog signal in the description of this embodiment, a digital signal may be input. In the case of a digital input signal, the A / D units 40 and 90 are unnecessary. Similarly, output terminals 200, 2
The video signal output from 50 is an analog signal,
A digital signal may be output. In the case of a digital output signal, the D / A units 190 and 240 are unnecessary.

Further, the present invention can be applied not only to a stereo moving picture video signal but also to a stereo still picture, thereby improving the compression efficiency.

[0064]

According to the present invention described in detail together with the embodiments, the following effects can be obtained.

Encoding a plurality of video signals having a strong correlation in parallel (encoding using correlation in the time axis direction for band compression, correlation in a screen, and bias in code appearance rate)
When encoding one of the plurality of video signals, the inter-frame encoding is first performed by using the other signal as reference data for inter-frame encoding. In stereo video compression in which the obtained result is further encoded, improvement of frame synchronization at the time of inter-frame decoding at the time of decoding is realized.

[Brief description of the drawings]

FIG. 1 is a functional block diagram illustrating a configuration example of a circuit according to a first embodiment of the present invention.

FIG. 2 is a flowchart showing an operation state of the first embodiment of the present invention.

FIG. 3 is a conceptual diagram of a video frame according to the present invention;
This is an example of a continuity counter value as frame information.

FIG. 4 is a conceptual diagram of a video frame according to the present invention;
This is an example based on time management information of reproduction output as frame information.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Transmission device 20 Encoding device 30 Input terminal 40 A / D part 50 Encoding means 60 Frame memory part 70 Encoding part 80 Input terminal 90 A / D part 100 Encoding means 110 Frame memory part 120 Encoding part 130 Communication part 140 Decoding device 150 Communication unit 160 Decoding unit 170 Decoding unit 180 Frame memory unit 190 D / A unit 200 Output terminal 210 Decoding unit 220 Decoding unit 230 Frame memory unit 240 D / A unit 250 Output terminal 260 Communication line

Claims (7)

[Claims] 1. A stereo video band compression encoding method for performing band compression on a plurality of video signals in parallel, wherein one of the plurality of video signals is independently correlated in a screen or correlated in a time axis direction. A main encoding step of performing encoding alone or in combination using the bias of the relation or the appearance rate of the code and performing band compression to generate a main compressed signal; and any one of the video signals and the plurality of videos The other one of the video signals is encoded using the correlation with the other one of the video signals, and then the correlation in the screen, the correlation in the time axis direction, or the bias of the code appearance rate is used. And a sub-encoding step of generating a double-compressed sub-compressed signal by performing encoding alone or in combination with the encoding performed, wherein any one of the plurality of video signals is independently displayed on a screen. Correlation and phase in the time axis direction When performing the main encoding using the bias of the correlation or the appearance rate of the code, and the other using the correlation between any one of the video signals and the other one of the plurality of video signals When sub-coding one video signal, video frame number information that can identify the playback order of video frames is added to each band-compressed main compression signal and sub-compression signal, and the compressed video signal And a stereo video band compression encoding method. 2. A stereo video band compression decoding method for decoding a plurality of band-compressed video signals in parallel, comprising: a correlation within a screen, a correlation in a time axis direction among the plurality of video signals. Or a main decoding step of decoding a main compressed signal that can be independently decoded, which is information that has been subjected to encoding processing by solely or in combination using encoding using the bias of the code appearance rate; and the plurality of videos. Of the signals, first, information obtained by performing coding processing using the correlation within the screen, the correlation in the time axis direction, or the coding using the bias of the code appearance rate alone or in combination is decoded independently. Further decoding by referring to information obtained by decoding the compressed signal, and a sub-decoding step of decoding a signal that has been double-compressed, wherein the main decoding step includes: Decode signal In this case, the video frame number information assigned to the main compressed signal is stored together with the decoded video signal, and is used as reference information for at least the sub-decoding step. Among them, first, the information which is coded using the correlation within the screen, the correlation in the time axis direction or the encoding using the bias of the code appearance rate alone or in combination is decoded independently, and then the main compression is performed. In order to perform sub-decoding with reference to the video signal obtained by decoding the signal, the video frame number information of the frame being decoded in the sub-decoding step and the main decoding of the same video frame number information are performed. A stereo video band compression / decoding method, comprising: performing inter-frame decoding with a video signal of (i) and decoding a signal that has been double-compressed. 3. A stereo video band compression / decoding method for decoding a plurality of band-compressed video signals in parallel, wherein a correlation in a screen and a correlation in a time axis direction among the plurality of video signals are provided. Or a main decoding step of decoding a main compressed signal that can be independently decoded, which is information that has been subjected to encoding processing by solely or in combination using encoding using the bias of the code appearance rate; and the plurality of videos. Of the signals, first, information obtained by performing coding processing using the correlation within the screen, the correlation in the time axis direction, or the coding using the bias of the code appearance rate alone or in combination is decoded independently. Further decoding by referring to information obtained by decoding the compressed signal, and a sub-decoding step of decoding a signal that has been double-compressed, wherein the main decoding step includes: Decode signal When performing, the time management information of the reproduction output added to the main compressed signal is stored together with the decoded video signal, and at least as reference information of the sub-decoding step, Of the video signals, first, the intra-screen correlation, time axis direction correlation or code using the bias of the appearance rate of the code alone or in combination decodes the information that was coded processing alone, after that, In order to perform sub-decoding with reference to the video signal obtained by decoding the main compressed signal, reproduction of the same or similar value as the time management information of the reproduction output of the frame being decoded in the sub-decoding step MPEG-2 by performing inter-frame decoding of the output time management information with the video signal of the main decoding corner and decoding of the signal which has been double-compressed
And decoding information corresponding to the transport stream of the stereo video band. 4. A stereo video band compression / encoding processing program for executing a stereo video band compression / encoding method for performing band compression on a plurality of video signals in parallel, wherein any one of the plurality of video signals is independently used. A main encoding step of performing encoding using solely or a combination of the correlations in the screen, the correlation in the time axis direction and the bias of the code appearance rate, or performing band compression to generate a main compressed signal, Encoding one other video signal using the correlation between any one video signal and the other one video signal of the plurality of video signals, then, the correlation in the screen, the time axis direction A sub-encoding step of generating a double-compressed sub-compressed signal by performing encoding using a correlation or a bias in the appearance rate of a code alone or in combination, and the plurality of video signals of When performing any one of the main encoding by using the correlation in the screen alone, the correlation in the time axis direction, or the bias of the code appearance rate, the one video signal and the plurality of video signals When sub-encoding the other one video signal using the correlation with the other one video signal, the video frame number information that can identify the reproduction order of the video frames is subjected to the band compression of each main video signal. A computer-readable recording medium having recorded thereon a stereo video band compression encoding processing program, which is transmitted to a compressed signal and a sub-compressed signal together with a compressed video signal. 5. A stereo video band compression encoding processing program for executing a stereo video band compression / decoding method for decoding a plurality of band-compressed video signals in parallel, wherein a screen among the plurality of video signals is Of the main compressed signal, which can be independently decoded, which is information obtained by coding alone or in combination by using the correlation in time, the correlation in the time axis direction or the bias of the code appearance rate. The main decoding step to be performed, and among the plurality of video signals, first, the encoding process using the correlation using the correlation in the screen, the correlation in the time axis direction or the bias of the code appearance rate was performed alone or in combination. Decoding the information independently, and then performing further decoding with reference to the information obtained by decoding the main compressed signal, and decoding the double-compressed signal in a sub-decoding step. In the main decoding step, when decoding the main compressed signal, video frame number information given to the main compressed signal is stored together with the decoded video signal, and at least the sub decoding step As reference information, in the sub-decoding step, among the plurality of video signals, first, a code using a correlation within a screen, a correlation in a time axis direction or a code using a bias of a code appearance rate is used alone or in combination. The decoded information is independently decoded, and then, in order to perform the sub-decoding with reference to the video signal obtained by decoding the main compressed signal, the video of the frame being decoded in the sub-decoding step Performing inter-frame decoding of frame number information and a video signal of the same main decoding corner of the same video frame number information, and decoding a signal that has been double-compressed. (E) A computer-readable recording medium on which a video band compression / decoding processing program is recorded. 6. A stereo video band compression / encoding processing program for executing a stereo video band compression / decoding method for decoding a plurality of band-compressed video signals in parallel, wherein: Of the main compressed signal, which can be independently decoded, which is information obtained by coding alone or in combination by using the correlation in time, the correlation in the time axis direction or the bias of the code appearance rate. The main decoding step to be performed, and among the plurality of video signals, first, the encoding process using the correlation using the correlation in the screen, the correlation in the time axis direction or the bias of the code appearance rate was performed alone or in combination. Decoding the information alone, and then further decoding with reference to the information obtained by decoding the main compressed signal, a sub-decoding step of decoding a signal that has been double-compressed, In the main decoding step, when decoding the main compressed signal, time management information of a reproduction output given to the main compressed signal is stored together with the decoded video signal, and at least As reference information for a decoding step, in the sub-decoding step, among the plurality of video signals, first, encoding using a correlation in a screen, a correlation in a time axis direction, or a bias in a code appearance rate is performed alone. Or decode the information encoded alone in combination, and then, in order to perform sub-decoding with reference to the video signal obtained by decoding the main compressed signal, by decoding in the sub-decoding step Decoding of a signal that has been subjected to inter-frame decoding between the time management information of the playback output of the current frame and the video signal of the main decoding corner of the time management information of the playback output having the same or a similar value, and Make MPEG2
A computer-readable recording medium having recorded thereon a stereo video band compression / decoding processing program, which decodes information corresponding to a transport stream. 7. An encoding process in which any one of a plurality of video signals is singly or independently combined with encoding using a correlation in a screen, a correlation in a time axis direction, or a bias in code appearance rate. The main compressed signal band-compressed by saying, one of the video signals, and the other one of the plurality of video signals using the correlation between the other video signal between the frames Sub-compression that is coded and then double-compressed by performing coding processing using correlation within the screen, correlation in the time axis direction, or coding using bias in code appearance rate alone or in combination A stereo video band compression signal having a data structure formed by adding video frame number information to each band-compressed main compression signal and sub-compression signal when encoding the video signal. Computer-readable recording medium.