JPH07284127A - Encoder/decoder for stereo image - Google Patents

Abstract

PURPOSE:To allow one system of a video signal transmission line to send a stereo image without increasing a signal band and to allow one video recording device to record a stereo video image. CONSTITUTION:While the number of frames per unit time of stereo video signals of two systems is halved by a video image selector 14, signals of both the systems are mixed for each frame and the result is outputted as a 2-system mixture video signal 141 and an discrimination code to discriminate the mixed signals of each system is superimposed on the video signal 141 by an discrimination signal adder 15 as the encoder configuration. Furthermore, the discrimination code in the mixed video signal is recognized by an discrimination signal demultiplexer 22 and the video selector 23 separates the mixed signal into the original 2-system video signals based on the result of recognition and fed to a video image storage device 24R or 24L and a video image interpolation compensation device 25 generates a compensation frame to insert it to the video signal of each system to be separated for the decoding to the number of frames of the original image.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stereo image encoder / decoder device suitable for communication / broadcasting / recording of stereoscopic image (stereo image) products such as natural images and computer graphics, and more particularly to band compression of video signals. Regarding technology.

[0002]

2. Description of the Related Art Conventionally, a stereo image (stereo image)
Are two independent video signals (R video signal and L video signal).
7 (a).
As shown in, two video tape recorders (VTRs)
Etc. were independently recorded in the video recording device 71.

In order to reproduce a stereo image based on the video signals independently recorded in the two video recording devices 71,
As shown in FIG. 7B, it is necessary to precisely synchronize the two video recording devices 71, which allows a stereo image to be displayed on the three-dimensional display device 72.

[0004]

In the above-mentioned conventional technique, (1) two video signal transmission lines required for communication / broadcast are required. In addition, a double transmission band is required to complete with one system. (2) Two devices (video recording device) for recording video signals are required. (3) Two devices for reproducing recorded stereo video signals. There was a problem that precise synchronization of the video recording device was required.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a stereo image encoder / decoder device capable of transmitting a stereo image by one system of a video signal transmission line without increasing the signal band. Especially. Another object of the present invention is to provide a stereo image encoder / decoder device capable of recording a stereo image with one video recording device.

[0006]

SUMMARY OF THE INVENTION The present invention provides a stereo image encoder device used for communication / broadcast / recording of a stereo image, in which the number of frames per unit time of stereo image signals of two systems is set for each system. The video signal mixing means for alternately mixing the video signals of both systems alternately for each frame while thinning out to half, and the identification signal for discriminating the signals of each system in the mixed video signals are concerned for each frame. It is characterized in that an identification signal adding means to be added to the mixed video signal is provided.

Further, according to the present invention, a stereo image decoder device used at the time of receiving / reproducing a stereo image receives a mixed video signal to which the identification signal is added as described above, and outputs the identification signal in the mixed video signal. Based on the identification signal recognition means to recognize and the identification signal recognition result of this identification signal recognition means,
Video separation means for separating the mixed video signals into original two-system video signals for each frame, and frame interpolation or frame for restoring the original image to the number of frames for each of the separated systems of signals. An image compensation means for extrapolation is provided.

[0008]

In the stereo image encoder device having the above-mentioned structure, the number of frames per unit time of the video signals of the two systems is halved for each system, and the video signals of both systems are reduced to one.
The video signal mixing means realizes the function of alternately mixing each frame to generate one system of mixed video signals.

That is, in the video signal mixing means, assuming that the number of frames (frame rate) per unit time of the video signals of the two systems (original video signal) is X (frame / second), the phase of each system is half. Frame rate shifted by X / 2
A video signal of (frame / second) is used, and both signals are alternately combined for each frame to generate a mixed video signal of one system. As a result, it is possible to superimpose the images of both systems on one signal line while maintaining the image frequency band for one system of the original image.

Further, in the stereo image encoder device having the above configuration, an identification signal (identification code) for discriminating a video signal (mixed video signal) mixed (synthesized) by the video signal mixing means is used as the mixed video signal. The function of superimposing is realized by the identification signal adding means.

That is, in the identification signal adding means, an identification signal (identification code) for system identification is provided for each image frame of each system included in the mixed image signal, for example, a blank image component in the frame signal. Processing to insert in the area is performed. This allows the stereo image decoder device to discriminate the frame signals of each system included in the mixed video signal.

Next, in the stereo image decoder device having the above configuration, the stereo image encoder device receives a signal (mixed video signal) in which the video signals of the respective systems are mixed, and receives the two systems of video signals which are the original signals. The function of separating into two is realized by the identification signal recognition means and the video separation means.

That is, the identification signal recognition means recognizes the identification signal (identification code) inserted in the video frame of each system included in the mixed video signal, and the identification signal is recognized from the mixed video signal. To be separated. Then, the video separation means performs processing for separating the mixed video signal from the original two-system video signals for each frame according to the identification signal recognition result of the identification signal recognition means.

The video signal of each system separated in this way becomes a signal having a frame rate of X / 2 (frames / second) in which the number of frames per unit time is halved from the original signal. Since the number of frames of the separated video signal of each system is halved, the video quality is deteriorated.

Therefore, in order to approximately restore the frames deleted when the video signals of the respective systems are mixed with the separated video signals of the respective systems to restore the original video frame rate, The image compensating means realizes a function of interpolating a frame approximated from the frame or extrapolating a frame approximated from the history of the previous frame.

That is, in the case of simple interpolation, the frame to be interpolated is generated by, for example, taking the average of the preceding and following frames. Further, in the case of simple extrapolation, for example, it is generated by adding the change of the image in the previous two frames to the immediately preceding frame. In either case, it is possible to approximate the frames deleted during encoding. And
By inserting this approximate frame, frame compensation is performed.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. [First Embodiment] FIG. 1 shows a first embodiment of the present invention. FIG. 1A is a functional block configuration diagram of a stereo image encoder device, and FIG. 1B is a stereo image decoder device. It is a functional block block diagram.

The encoder device shown in FIG. 1 (a) is used for communication / broadcasting / recording of a stereo image (stereo image), and includes A / D converters 11R, 11L, image storage devices 12R, 12L, Identification signal reference pulse generator 13,
It is composed of an image selector 14, an identification signal adding device 15 and a D / A converter 16.

The A / D converters 11R and 11L are independent R (right) analog video signals (R input) 111, respectively.
The R, L (left) analog video signal (L input) 111L is converted into a quantized digital signal (digital video signal).

The video storage devices 12R and 12L are for temporarily holding the digital video signals quantized by the A / D converters 11R and 11L, for example, in frame units.

When the output (encoder output) 161 of the present encoder device has to be synchronized with the external equipment, the identification signal reference pulse generator 13 generates an output pulse for the external pulse (external synchronization signal) 131. A reference pulse (timing signal) 132 for adjusting is generated.

Based on the timing signal 132 from the identification signal reference pulse generator 13, the video selector 14 outputs the signals of R and L systems (digital video signals) held in the video memories 12R and 12L, respectively. By halving the number of frames per unit time of each system, the two-system mixed video signal 141 is generated by alternately mixing each frame.

The identification signal adding device 15 is a video selecting device 14.
Of the two-channel mixed video signal 141 from
An identification signal (identification code, identification marker) for identifying the R signal is provided in the signal of the R system (R signal) in FIG.
An identification signal (identification code, identification marker) for L signal identification is added to each of the L system signals (L signals) in each frame.

The D / A converter 16 is the identification signal addition device 1
The two-system mixed video signal with the identification signal from 5 is converted into an analog video signal. This D / A converter 16
Output (analog video signal) becomes the output (encoder output) 161 of the encoder device.

On the other hand, the decoder device shown in FIG.
Used when receiving / playing stereo video.
/ D converter 21, identification signal separation device 22, image selector 2
3, video storage units 24R and 24L, video interpolation compensator 25, and D / A converters 26R and 26L.

The A / D converter 21 converts the decoder input (two-system mixed video signal with identification signal) 211 corresponding to the encoder output 161 in FIG.
It is for converting into a system mixed video signal.

The identification signal separation device 22 includes an A / D converter 2
A video storage device for storing the video among the video storage devices 24R and 24L based on the identification signal recognition result by recognizing the identification signal in the two-system mixed video signal converted and output from 1 and separating it from the video signal. Is instructed to the image selector 23 on a frame-by-frame basis.

The image selector 23 is an identification signal separation device 22.
Based on the recognition result of the identification signal from, the image is selected in frame units and stored in the corresponding image storage unit of the image storage units 24R and 24L.

The image memories 24R and 24L are respectively R
And L images for each system are temporarily held in frame units. The video interpolation compensator 25 targets the video stored in the video storages 24R and 24L by the video selector 14 in the decoder device shown in FIG.
Half of the video frames lost when the systematic mixed video signal 141 is generated is approximately restored by the simple frame interpolation method.

The D / A converters 26R and 26L convert the images (digital image signals) of the R and L systems held in the image storage devices 24R and 24L into R analog image signals and L analog image signals, respectively. It is to convert. The outputs of the D / A converters 26R and 26L become the R output 261R and L output 261L of the present decoder device.

FIG. 2 shows the configuration of the video storage device 24i (i = R, L) in the decoder device of FIG. 1 (b) in association with the video interpolation compensator 25. As shown in FIG. 2, the video storage unit 24i has three video buffers 241 to 243 and a video selected from the video buffers 241 and 243 by the video selector 23 in FIG. ) Is selected from the input selector 244 for selecting the storage destination of each frame in units of frames and the video buffers 241 to 243 (D / A converter 26i).
2) An output selector 245 that selects the storage source of the i video to be extracted in frame units.

The video buffers 241 and 243 of the video buffers 241 to 243 are used to alternately store the video frames for i selected and sent by the input selector 244, and the video buffer 242 is the video buffer 24.
It is used to store a video frame (compensation frame) in the middle of the two video frames stored in 1 and 243. The intermediate video frame (compensation frame) is generated by the video interpolation compensator 25.

Next, the operation of the first embodiment of the present invention will be described.
The operation will be described in order of (1) the operation of the encoder device and (2) the operation of the decoder device. (1) Operation of Encoder Device First, in the encoder device having the configuration shown in FIG. 1A, two systems of analog video signals for stereo images, that is, R analog video signal (R input) 111R and L analog video are used. A signal (L input) 111L is input from a stereoscopic camera, computer graphics (CG), or the like.

The A / D converters 11R and 11L respectively convert the R analog video signal (R input) 111R and the L analog video signal (L input) 111L into a quantized digital signal (digital video signal).

The R digital video signal and the L digital video signal output from the A / D converters 11R and 11L are held in the corresponding video memories 12R and 12L, for example, in frame units.

An external synchronizing signal 131 is also input to the encoder device having the structure shown in FIG. The identification signal reference pulse generator 13 receives the external synchronization signal 131 and generates a timing signal 132 which is a reference pulse for adjusting the generation timing of the output of the encoder device.

The timing signal 132 from the identification signal reference pulse generator 13 is supplied to the image selector 14. Based on this timing signal 132, the image selector 14 thins out the number of frames per unit time of each system of the R and L digital image signals held in the image storage units 12R and 12L. The two-system mixed video signal 141 is generated by alternately mixing every one frame.

That is, the video selector 14 sets the number of frames (frame rate) per unit time of the original digital video signals of the R and L systems to X (frames / second),
Frame rate X /
A video signal of 2 (frames / second) is used, and both signals are combined (mixed). As a result, the R and L video images can be combined into one video signal, that is, the two-system mixed video signal 141, while maintaining the video frequency band for one system of the original video.

The two-system mixed video signal 141 generated by the video selector 14 is supplied to the identification signal adding device 15. When the identification signal adding device 15 receives the two-system mixed video signal 141, the identification signal (identification code, identification marker) for discriminating the video signals of R and L systems alternately included in the signal 141. Is added to the signal 141 without impairing the original signal state (information of the original signal), that is, the tone is added. More specifically, the identification signal adding device 15 causes the identification code for identifying the R signal in the blank area of the video component in each frame signal (R signal) of the R system in the two-system mixed video signal 141. R signal marker),
An identification code (L signal marker) for identifying the L signal is inserted in each blank area of the image component in each frame signal (L signal) of the L system in the two-system mixed video signal 141. By inserting this identification code (identification marker) into the two-system mixed video signal 141, the video signals (signal frames) of both R and L systems included in the signal 141 will be described with reference to FIG.
Discrimination can be performed by the decoder device of (b).

The signal added with the identification code (identification marker) in the two-system mixed video signal 141 by the identification signal adding device 15 is supplied to the D / A converter 16. The D / A converter 16 converts the two-system mixed video signal with the identification code (identification marker) from the identification signal addition device 15 into an analog video signal. The output (analog video signal) of the D / A converter 16 becomes the output (encoder output) 161 of the encoder device.

As described above, in the encoder device having the configuration of FIG. 1A, a video signal (stereo image) consisting of two systems of R and L is halved in the number of frames per unit time of each system of R and L. The video signals of both R and L
Alternate every frame. A function of generating a two-system mixed video signal 141 including video signals of both R and L systems while maintaining the video frequency band for one system of the original video, and R and L systems included in the signal 141. Code (identification marker) for discriminating the video signal of each video frame unit
Is inserted (added) into each corresponding video frame (in the blank area of the video component in the frame). With the function of this encoder device, a stereo image can be transmitted by one system of the video signal transmission line while maintaining the conventional video frequency band (signal band), and the stereo image can be recorded by one video recording device. can do.

(2) Operation of Decoder Device First, the decoder device having the configuration shown in FIG.
Output (encoder output) 16 of the encoder device of (a)
A decoder input (a two-system mixed video signal in which R and L video frames are alternately mixed and an identification code is added to each frame) 211 corresponding to 1 is given. The decoder input 211 is, for example, the output (encoder output) 161 of the encoder device of FIG.

The A / D converter 21 converts the decoder input (two-system mixed video signal with identification code) 211 into a digital two-system mixed video signal. The identification signal separation device 22 recognizes the identification code (identification signal, identification marker) in the two-system mixed video signal converted and output from the A / D converter 21, separates it from the video signal, and the identification code is R.
If it is a signal marker, the video selector 23 is instructed to store the corresponding video frame in the video memory 24R, and if it is an L signal marker, the video selector 23 is instructed to store the corresponding video frame in the video memory 24L.

The image selector 23 is an identification signal separation device 22.
Each time an instruction based on the identification code recognition result is received from, a corresponding video frame is selected from the two-system mixed video signal,
The video frame (video signal therein) is sent to the video memory 24i (i is R or L) instructed by the video selector 23.

By the operation of the video selector 23, the two-system mixed video signal is separated into the two systems of the original video signals R and L on a frame-by-frame basis, and the R video signal (R
The frame) is sent to the video storage unit 24R and the L video signal (L frame) is sent to the video storage unit 24L alternately.

The video signal separated as described above is
The signal has a frame rate of X / 2 (frames / second). Therefore, in the decoder device configured as shown in FIG.
For the separated i-use (i is R or L) video signal, in order to restore the original video (image) to the frame rate, the video memory 24i and the video interpolation compensator having the configuration shown in FIG. The frame interpolation operation by 25 is performed. This operation will be described with reference to FIG.

First, the frame interpolation operation by the video storage unit 24i and the video interpolation compensator 25 is divided into three states, that is, operating state # 1 to operating state # 3. In the operating state # 1, the image is separated by the image selector 23 and is stored in the image memory 24i.
The video frame (video signal) A for i sent to
By the input selector 244 in the video storage device 24i, FIG.
It is stored in the video buffer 241 as shown in FIG.
At the same time, the video buffer 243 precedes the video frame A.
The video frame for the same i (which is referred to as a video frame C) stored in (1) is extracted by the output selector 245 and output to the outside of the video memory 24i as shown in FIG. The video frame C is guided to the D / A converter 26i shown in FIG.

During this period, the video interpolation compensator 25 sets the video frame B, which is just in the middle of the video of the preceding frame C in the video buffer 243 and the subsequent frame A in the video buffer 241, as shown in FIG. Then, the average (A + C) / 2 of the frame C and the frame A is obtained (for example, for each pixel at the same position), and is written in the video buffer 242. Therefore, the time series of the video frames in the video buffers 241, 242, 243 at this point is in the order of C, B, A, and between the frames C, A, the video of the frames C and A is averaged. That is, the video frame B is interpolated.

In the next operating state # 2, the video frame sent from the video selector 23 (if i = R, the L frame following the R frame A, L if i = L).
The frame for R following the frame for A) has another system (i =
If R, then L); if i = L, then R). Therefore, no video frame is input to the video storage device 24i. Then, as shown in FIG. 3B, the frame B following (interpolated) the frame C is extracted from the video buffer 242 and output by the output selector 245 in chronological order.

In the next operation state # 3, as shown in FIG. 3C, the output selector 245 causes the frame A following the (interpolated) frame B to be displayed in the video buffer 2 in chronological order.
It is taken out from 41 and outputted. At the same time, image selector 2
The video frame for i (referred to as a video frame C ′) sent from No. 3 by the input selector 244 of FIG.
It is stored in the video buffer 243 as shown in (c).

During this time, the video interpolation compensator 25, as in the case of the above-mentioned operation state # 1, as shown in FIG. 3C, the preceding frame A in the video buffer 241 and the subsequent frame in the video buffer 243. A video frame B ', which is the average of the frame C', is generated and written in the video buffer 242. Therefore, each video buffer 24 at this point
The time series of the video frames in 1, 242 and 243 are A,
B ', C'in order (including the already output frame, C,
B, A, B ', C'in this order), and the video frame B', which is the average of the video of the frames A and C ', is interpolated between the frames A and C'.

After the above operating state # 3, the operating state # 1
Then, the operation states # 1 to # 3 are repeated thereafter. As described above, the embodiment of the stereo image encoder device and the data device when the frame interpolation method is applied (first embodiment)
I explained.

[Second Embodiment] Next, an embodiment (second embodiment) of a stereo image encoder device and a decoder device when the frame extrapolation method is applied will be described with reference to the drawings.

FIG. 4 shows a second embodiment of the present invention. FIG. 4 (a) is a functional block configuration diagram of a stereo image encoder device, and FIG. 4 (b) is a functional block configuration diagram of a stereo image decoder device. Is. The same parts as those in FIG. 1 are designated by the same reference numerals.

First, the encoder device shown in FIG. 4 (a) has the same structure as the encoder device shown in FIG. 1 (a). Therefore, description of the configuration of the encoder device of FIG. 4A is omitted.

Next, the decoder device shown in FIG.
Image storage units 34R and 34L are used in place of the image storage units 24R and 24L in FIG.
Except that the video extrapolation compensator 35 is used instead of
It has the same configuration as the decoder device shown in FIG. Therefore, parts different from the decoder device of FIG. 1B, that is, the video storage units 34R and 34L and the video extrapolation compensator 3 are provided.
Only No. 5 will be described below.

FIG. 5 shows the configuration of the video storage unit 34i (i = R, L) in the decoder device of FIG. 4B in association with the video extrapolation compensator 35. As shown in FIG. 5, the video storage unit 34i includes two video buffers 341 and 342 and one of the video buffers 341 and 342 (D / A converter 26).
(i) An output selector 345 that selects the storage source of the i video to be extracted in frame units.

The video buffer 341 is used to store the i video frame selected and sent by the video selector 23 in FIG. 4B, and the video buffer 342 is generated by the video extrapolation compensator 35. It is used to store the extrapolated video frame (compensation frame).

The video extrapolation compensator 35 is a video memory 34i.
The video selector 1 in the encoder device shown in FIG. 4A targets the video held in the video buffer 341 in
In FIG. 4, half of the video frames lost when the two-system mixed video signal 141 is generated in 4 is approximately restored by the simple frame extrapolation method. Here, the video extrapolation compensator 35 is
An extrapolation frame is generated by adding the video changes in the previous two frames to the previous frame.

Here, in order to restore the original video (image) frame rate to the operation of the configuration of FIG. 5, that is, the separated video signal for i (i is R or L), 34i (i = R, L) and the frame extrapolation operation performed by the video interpolation compensator 35 will be described with reference to FIG.

First, as an initial state, the video buffer 34
It is assumed that the video frame A exists in 1 and the extrapolated video frame B exists in the video buffer 342. The time series of both frames is in the order of A and B.

First, in the operating state # 1, as shown in FIG. 6A, the frame A stored in the video buffer 341 is taken out by the output selector 345 and output to the outside of the video memory 24i. This video frame A is shown in FIG.
It is led to the D / A converter 26i of (b).

At the same time, a new video frame for i (which will be referred to as video frame A ') sent from the video selector 23 is written in the video buffer 341 as shown in FIG. 6A. At this time, before outputting the video frame from the video buffer 341 by the output selector 345, the frame input (writing) process to the video buffer 341 is performed so that the video buffer 341 is not updated by a new frame. It is set to be slightly behind the frame output processing. In this embodiment, since the input frame from the video selector 23 is always written in the video buffer 341, the input selector 244 shown in FIGS. 2 and 3 is not necessary.

Now, the time series of the video frames at the time when the new video frame A'is written in the video buffer 341 (end of operation state # 1) is A, B, A '. In the next operation state # 2, as shown in FIG.
The frame B following (extrapolated) the frame B is extracted from the video buffer 342 and output by the output selector 345 in chronological order.

At this time, the video extrapolation compensator 35 has the frame B extracted from the video buffer 342 and the frame A'in the video buffer 341 following the frame B.
The next extrapolation frame B ′ is generated based on Here, the image change (A'-B) (for each pixel at the same position) in the two frames A'and B is added (for each pixel) to the immediately preceding frame A '(A'-B) + A. The extrapolation frame B '(B' = 2A'-B) is generated by performing the processing of '.

The video extrapolation compensator 35 stores the extrapolation frame B'generated as described above in the video buffer 342 as shown in FIG. 6B. Therefore, the time series of the video frames at this point is in the order of A, B, A ', B'including the already output frames.

In the next operation state # 3, as shown in FIG. 6C, the output selector 345 extracts the frame A'following the (extrapolated) frame B from the video buffer 341 in chronological order. Output. At the same time, a new video frame for i (which is referred to as a video frame A ″) sent from the video selector 23 is stored in the video buffer 341 as shown in FIG. It is basically the same as the previous operating state # 1 (apart from the contents of the frame), indicating that this mechanism has two states.

In the second embodiment to which the frame extrapolation method is applied, the number of parts in the video storage is smaller than that in the first embodiment to which the frame interpolation method is applied, that is, the first embodiment. In the video storage device 24i (i = R, L) in
While three video buffers are required, the video storage device 34i in the second embodiment requires only two, and the input selector 244 required in the first embodiment is unnecessary in the second embodiment. Therefore, the mechanism can be simplified.

[0069]

As described above in detail, according to the present invention, in the stereo image encoder device used for communication / broadcast / recording of a stereo image, the number of frames per unit time of the signal of each system of the video is determined. Since the signals of both systems are alternately mixed for each frame while thinning out to half to generate a signal of one system (mixed video signal), the video signal transmission line 1 can be used without increasing the signal band. The system can transmit stereo images. Moreover, a stereo image can be recorded by one conventional video recording device such as a video tape recorder.

Further, according to the present invention, since the identification signal for discriminating the video signals of the respective systems included in the mixed video signals combined into one system is added to each frame in the encoder device, A stereo image decoder device used when receiving / reproducing a stereo image can easily separate the original two-system video signals by detecting and recognizing this identification signal. Moreover, in order to restore the original image frame rate to the separated video signals of each system, a compensation frame that approximates the deleted frame is generated and inserted, so that the signal band is not increased. Since the images are combined into one system, it is possible to prevent the deterioration of the image quality due to the halving of the number of frames per unit time.

[Brief description of drawings]

FIG. 1 shows a first embodiment of the present invention.
FIG. 1A is a functional block configuration diagram of a stereo image encoder device, and FIG. 1B is a functional block configuration diagram of a stereo image decoder device.

FIG. 2 is a video storage unit 24 in the decoder device of FIG. 1 (b).
The figure which shows the structure of i (i = R, L) in association with the image interpolation compensator 25.

FIG. 3 is a diagram for explaining a frame interpolation operation by the video storage unit 24i and the video interpolation compensator 25 having the configurations shown in FIG.

FIG. 4 shows a second embodiment of the present invention.
4A is a functional block configuration diagram of a stereo image encoder device, and FIG. 4B is a functional block configuration diagram of a stereo image decoder device.

5 is a video storage device 34 in the decoder device of FIG. 4 (b).
The figure which shows the structure of i (i = R, L) in association with the video extrapolation compensator 35.

6 is a diagram for explaining a frame extrapolation operation performed by the video storage unit 34i and the video extrapolation compensator 35 having the configurations shown in FIG.

FIG. 7 is a diagram for explaining a conventional stereo image recording / reproducing technique.

[Explanation of symbols]

11R, 11L, 21 ... A / D converter, 12R, 12L, 24R, 24L, 34R, 34L ... Image storage device, 13 ... Identification signal reference pulse generator, 14 ... Image selection device (image signal mixing means), 15 ... identification signal adding device, 16, 26R, 26L ... D / A converter, 22 ... identification signal separating device (identification signal recognizing means), 23 ... image selecting device (image separating means), 25 ... image interpolation compensator ( Video compensation means), 35 ... video extrapolation compensator (video compensation means), 241-243, 341, 342 ... video buffer, 244 ... input selector, 245, 345 ... output selector.

Claims (3)

[Claims] 1. A video signal mixing means for alternately mixing, for each frame, the video signals of both systems while thinning out the number of frames per unit time of the two systems of stereo video signals for each system. Identification signal adding means for adding an identification signal for discriminating the signals of the respective systems in the video signal mixed by the video signal mixing means to the mixed video signal for each frame, wherein the identification signal is A stereo image encoder device, wherein the added mixed video signal is used for communication, broadcasting and / or recording of a stereo image. 2. The number of frames per unit time of the two systems of stereo video signals is halved for each system, and the video signals of both systems are alternately mixed for each frame, and the signals of each system are discriminated. Receiving the mixed video signal to which the identification signal of each frame is added, the identification signal recognition means for recognizing the identification signal in the mixed video signal, and based on the identification signal recognition result of the identification signal recognition means, Video separation means for separating the mixed video signals into original two-system video signals for each frame, and for restoring the signals of the respective systems separated by the video separation means to the number of frames of the original image A stereo image decoder device, comprising: a video compensating means for performing frame interpolation or frame extrapolation. 3. A stereo image encoder device used for communication, broadcasting and / or recording of a stereo image, wherein the number of frames per unit time of a stereo image signal of two systems is thinned to half for each system. Video signal mixing means for alternately mixing the video signals of both systems for each frame, and an identification signal for discriminating the signals of the respective systems in the video signals mixed by the video signal mixing means for each frame A stereo image encoder device for outputting the mixed video signal to which the identification signal is added for communication, broadcasting and / or recording of a stereo image, and the stereo signal encoder device. Communication from the image encoder device
A stereo image decoder device for receiving a mixed video signal added with the identification signal used for broadcasting or recording and restoring the original two-system video signal, and recognizing the identification signal in the mixed video signal. Based on the identification signal recognition result of the identification signal recognition means, the image separation means for separating the mixed video signal into the original two-system video signals for each frame, and the video separation means. A stereo image decoder device having a video compensating means for performing frame interpolation or frame extrapolation for restoring the original signals to the number of frames of the original image. Image encoder / decoder system.