JP2002218469A - Moving image encoding device, moving image transmitting device and moving image transmitting and recording device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a moving image encoding device, a moving image transmitting device and a moving image transmitting and recording device which are suitable to perform simply error detection without depending upon an error correction code. SOLUTION: This moving image encoding device is provided with a macroblock counting part 130 for counting the number of encoded macroblocks and outputting a synchronous macroblock insertion instruction, a synchronous pattern preparation instructing part 132 for turning on a forced motion compensation predictive signal when the synchronous macroblock insertion instruction is inputted, and a motion compensating part 120 for deciding motion compensation to be effective with a forced motion compensation predictive macroblock, and inserts a fixed bit pattern for synchronization confirmation into each macroblock in a fixed interval.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a moving picture coding apparatus for coding a moving picture, a moving picture transmitting apparatus including the same, and a moving picture transmission recording apparatus.

[0002]

2. Description of the Related Art Conventionally, this kind of moving picture transmission apparatus has been known as a CRC.
A video encoding device having an encoder, a transmission device, and a CR
If the transmission path quality is inferior, an error correction code is added on the transmission side, and an erroneous bit string is detected and corrected on the reception side, thereby deteriorating the image quality. (JP-A-6-98313).

[0003] Annex B of ITU-T recommendation H.220 (related to general-purpose video and audio coding methods) describes the above-described error detection method. , While calculating a CRC code such that the decoding result becomes 0, and adding the CRC code to a predetermined bit position for transmission, the receiving side determines whether there is an error based on whether the CRC decoding result is 0 or not. The basic idea is to do.

[0004]

However, in such a conventional moving picture transmission apparatus, it is necessary to add an encoding apparatus and a decoding apparatus for an error correction code. There was a problem that led to up.

[0005] Further, there is an upper limit in the error detection capability, and even if it is possible to predict an increase in the bit error rate due to a decrease in the transmission path quality, the error correction code can be inserted only into the bit positions specified in the ITU-T recommendation. However, there is a problem that the error detection capability cannot be improved.

Further, when a bit error exceeding the error detection capability occurs, the occurrence of the error cannot be recognized and the erroneous bit sequence is continuously decoded as a correct input. However, different decoding is performed not only on the portion where an error has occurred but also on a correct variable-length code where no error has occurred, and there has been a problem that image quality degradation often spreads continuously over a wide range.

The present invention has been made in order to solve such a problem, and provides a moving picture encoding apparatus, a moving picture transmission apparatus, and a moving picture transmission recording apparatus suitable for simply performing error detection. Is what you do.

[0008]

A moving picture transmission apparatus according to the present invention counts the number of coded macroblocks, and instructs insertion of a synchronous macroblock for each fixed number of macroblocks, and the synchronous block. A synchronous pattern creation instructing means for outputting an instruction to encode one item in the macroblock accompanying information from which various types of macroblocks can be selected into a fixed value, and a fixed value according to the instruction of the synchronization pattern creation instructing means. Encoding means for encoding
A synchronous macroblock determining means for determining whether or not the synchronous macroblock is used, and a bit error is detected by determining whether or not the fixed value of the macroblock accompanying information is the same as the value at the time of encoding in the synchronous macroblock. It has a configuration in which a synchronization pattern checking unit and an image reproducing unit that sets a reference image at the same position as an input macroblock as a reproduced image when a bit error is detected are provided. With this configuration, since the fixed accompanying information is encoded at a constant macroblock interval,
Even if a bit error occurs in the transmission path and erroneous decoding of the variable-length code is started from the error position, the synchronization macro block detects a bit error occurrence by receiving a bit string other than the fixed position, By using the reference image at the same position as the input macroblock as the reproduced image, the disturbance of the image due to erroneous decoding is localized.

Further, the video encoding apparatus of the present invention comprises: a macroblock counting means for counting the number of encoded macroblocks and outputting an instruction to insert a synchronous macroblock;
Synchronization pattern creation instructing means for turning on a compulsory motion compensation prediction signal for motion-compensating a reference image to become a prediction image when the synchronization macroblock insertion instruction is input, and a prediction image for motion-compensating the reference image. And a motion compensation unit that determines that motion compensation is effective in the compulsory motion compensation prediction macro block to be set. With this configuration, by outputting a bit sequence in which motion compensation prediction is enabled at a constant macroblock interval, a bit error occurs in the transmission path, and even when erroneous decoding of a variable length code is started from an error position, forced In the motion compensation prediction macro block, the motion compensation prediction OFF is received, and a bit error can be detected, thereby localizing a video disturbance due to an erroneous decoding of the variable length code.

Further, the moving picture coding apparatus according to the present invention comprises: a macroblock counting means for counting the number of coding macroblocks and outputting an instruction to insert a synchronous macroblock;
Synchronization pattern creation instructing means for turning on a compulsory motion compensation prediction signal for motion-compensating a reference image to become a prediction image when the synchronization macroblock insertion instruction is input, and a prediction image for motion-compensating the reference image. A motion compensating unit that determines that motion compensation is valid, and selects a predetermined specific mode among a plurality of types of motion compensation modes. I have. With this configuration, by outputting a bit sequence in which motion compensation prediction of a specific mode is selected at a constant macroblock interval, a bit error occurs in the transmission path, and when error decoding of a variable length code is started from an error position, Also, by receiving a bit sequence other than the specific prediction mode in the forced motion compensation prediction macroblock, it is possible to detect a bit error, and to localize video disturbance due to erroneous decoding of a variable length code. Become.

Further, the moving picture coding apparatus of the present invention comprises: a macroblock counting means for counting the number of coding macroblocks and outputting an instruction to insert a synchronous macroblock;
Synchronized pattern creation instructing means for turning on the forced motion compensation prediction signal for turning on the reference image to obtain a predicted image by motion compensation when the synchronization macroblock insertion instruction is input, and a predicted image obtained by motion compensating the reference image. And a motion compensating unit that determines that motion compensation is valid and sets a motion amount to zero in a forced motion compensation prediction macro block to be set. With this configuration, when a bit sequence in which motion compensation prediction with a motion amount of 0 is selected is output at a constant macroblock interval, a bit error occurs on a transmission path, and erroneous decoding of a variable length code is started from an error position Also in the above, by receiving a bit sequence having a motion amount other than 0 in the forced motion compensation prediction macro block, a bit error can be detected, and video disturbance due to erroneous decoding of a variable length code is localized. It will be.

[0012] Also, the moving picture coding apparatus of the present invention comprises: a macroblock counting means for counting the number of coded macroblocks and outputting an instruction to insert a synchronous macroblock;
When the synchronization macroblock insertion instruction is input, a synchronization pattern creation instruction unit that turns on a forced intraframe encoding selection signal for unconditionally performing intraframe encoding,
An interlaced / non-interlaced judging means for selecting intra-frame encoding in a compulsory intra-frame encoded macroblock to be subjected to unconditional intra-frame encoding is provided. With this configuration, by outputting a bit sequence in which intra-frame encoding is selected at a constant macroblock interval, a bit error occurs on the transmission path, and even when erroneous decoding of a variable-length code is started from an error position, By receiving a bit string other than the intra-frame prediction in the forced intra-coded macroblock, a bit error can be detected, and video disturbance due to erroneous decoding of a variable-length code is localized. .

The video encoding apparatus of the present invention further comprises: a macroblock counting means for counting the number of encoded macroblocks and outputting an instruction to insert a synchronous macroblock;
Synchronization pattern creation instructing means for turning on a forced frame discrete cosine transform selection signal for performing discrete cosine transform in a frame structure when the synchronization macroblock insertion instruction is input, and when the forced frame discrete cosine transform selection signal is on. Has an arrangement in which orthogonal transform means for unconditionally selecting a frame discrete cosine transform and performing orthogonal transform is provided. With this configuration, a frame DCT is output at a fixed macroblock interval by outputting a selected bit string, so that a bit error occurs in the transmission path, and even when erroneous decoding of a variable length code is started from an error position, a forced frame is output. By receiving a bit string other than the frame DCT in the DCT macroblock, a bit error can be detected, and the disturbance of video due to erroneous decoding of the variable length code is localized.

The video encoding apparatus according to the present invention further comprises: a macroblock counting means for counting the number of encoded macroblocks and outputting an instruction to insert a synchronous macroblock;
A synchronous pattern creation instructing means for outputting a fixed quantization width when the synchronous macroblock insertion instruction is input is provided. With this configuration, by outputting a fixed quantization width to a bit string at a constant macroblock interval, a bit error occurs on a transmission path, and even when erroneous decoding of a variable length code is started from an error position, a synchronization pattern is created. By receiving a bit string other than the fixed quantization width in the macro block, a bit error can be detected, and the disturbance of the video due to erroneous decoding of the variable-length code is localized.

Further, a moving picture transmitting apparatus according to the present invention includes the moving picture coding apparatus, and a moving picture decoding apparatus connected to the moving picture coding apparatus by a transmission means. Further, the number of decoding macroblocks is counted, a synchronous macroblock determining means for outputting a synchronous pattern check instruction for each macroblock at a predetermined interval, and when a synchronous pattern check instruction is input, the macroblock A synchronization pattern checking unit that determines a stream error based on whether or not a pattern is included, a motion compensation unit that outputs a reference image at the same position as the decoded macroblock when a stream error occurs, and a unit that outputs the reference image. Switch means;
An addition unit for outputting a reproduced image is provided, and when a synchronization pattern is abnormal, an image at the same location of the previous frame is output again. With this configuration, even when a bit error occurs in the transmission unit (transmission path) and erroneous decoding of the variable length code starts from the error position, a bit string other than the synchronization pattern is received by the synchronization pattern creation macroblock. As a result, a bit error can be detected, and by outputting the same video as the previous frame, a video in which disturbance of the video due to erroneous decoding of the variable length code is localized is output to the monitor.

Further, the moving picture transmitting apparatus according to the present invention includes an error measuring means for measuring a stream error occurrence frequency in the moving picture decoding apparatus, and transmitting the stream error occurrence frequency to the moving picture encoding apparatus. Error frequency sending means for sending to the network, error frequency input means for inputting the stream error occurrence frequency to the video encoding device from the network, and the video encoding device when the stream error occurrence frequency increases. In this case, while the insertion interval of the synchronous macroblock is narrowed, when the occurrence frequency of the stream error is reduced, an insertion interval changing unit for increasing the insertion interval of the synchronous macroblock is provided. According to this configuration, the bit error occurrence state is fed back from the video decoding device to the video encoding device, so that when a bit error changes on the transmission path, the error detection capability can be automatically adjusted.

Further, the moving picture transmitting apparatus of the present invention comprises: a position output means for outputting a horizontal position and a vertical position in a screen where a stream error has occurred in the moving picture decoding apparatus; Position sending means for sending to the network, position input means for inputting the horizontal position and the vertical position to the moving picture coding apparatus, and suppressing the horizontal position and the vertical position from being used as reference images for motion compensation prediction. It has a configuration provided with reference suppression means. With this configuration, when a bit error occurs in the transmission path, the horizontal position and the vertical position are fed back to the video encoding device. Target expansion. Further, it is possible to easily cope with a moving image transmission apparatus using a wireless transmission path, and even when a transmission path error occurs, image disturbance can be localized spatially / temporally to maintain image quality.

The moving picture transmission apparatus of the present invention further comprises: an error measuring means for measuring a stream error occurrence frequency in the moving picture decoding apparatus; and an error frequency sending means for sending the stream error occurrence frequency to the network. An error frequency input unit for inputting the stream error occurrence frequency to the video encoding device, and, when the stream error occurrence frequency increases, reducing a block ratio for motion compensation prediction in the video encoding device. And a motion compensation means for increasing the block ratio for motion compensation prediction when the stream error occurrence frequency decreases. With this configuration, when the bit error rate is large, the number of motion-compensated predicted macroblocks is reduced to prevent spatial expansion of video disturbance, and when the bit error rate is small, the number of motion-compensated predicted macroblocks is increased. This improves the image quality.

A moving picture transmission and recording apparatus according to the present invention includes the moving picture coding apparatus and a moving picture decoding apparatus connected to the moving picture coding apparatus by a transmission means. The apparatus further counts the number of decoding macroblocks, outputs a synchronization pattern check instruction for each macroblock at a predetermined interval, and inputs a synchronization pattern check instruction. A synchronization pattern checking unit that determines a stream error based on whether a synchronization pattern is included, a motion compensation unit that outputs a reference image at the same position as the decoded macroblock when a stream error occurs, and outputs the reference image. Switch means and an addition means for outputting a reproduced image. A moving picture transmission apparatus that outputs the same location image of the previous frame again, and has a structure provided with a recording means. With this configuration, even when transmitted by a transmission path with poor transmission quality, as described above, it is possible to record an image with little disturbance of the transmitted image,
Images can be transmitted and recorded to remote values even in places where there is no wired line with good line quality, and can be used as security equipment.

Further, the moving picture transmission / recording apparatus of the present invention comprises an error measuring means for measuring a stream error occurrence frequency in the moving picture decoding apparatus, and transmitting the stream error occurrence frequency to the moving picture encoding apparatus. Error frequency sending means for sending the stream error occurrence frequency to the video encoding device from the network, and an error frequency sending means for sending the stream error occurrence frequency to the video encoding apparatus. A moving image transmission apparatus provided with an insertion interval changing means for increasing an insertion interval of the synchronous macroblock when the stream error occurrence frequency is reduced while reducing an insertion interval of the synchronous macroblock in the apparatus; Means. With this configuration, even when transmitted by a transmission path with poor transmission quality, as described above, it is possible to reduce the disturbance of the transmitted image and record it, and in a place where there is no wired line with good line quality. Can also transmit and record an image to a remote value, and can be used as a security device.

Also, the moving picture transmission and recording apparatus of the present invention comprises: a position output means for outputting a horizontal position and a vertical position in a screen where a stream error has occurred in the moving picture decoding apparatus; Position sending means for sending to the network, position input means for inputting the horizontal position and the vertical position to the video encoding device, and suppressing the horizontal position and the vertical position from being used as reference images for motion compensation prediction And a recording device. With this configuration, even when transmitted by a transmission path with poor transmission quality, as described above, it is possible to reduce the disturbance of the transmitted image and record it, and in a place where there is no wired line with good line quality. Can also transmit and record an image to a remote value, and can be used as a security device.

Further, the moving picture transmission and recording apparatus of the present invention comprises: an error measuring means for measuring a stream error occurrence frequency in the moving picture decoding apparatus; and an error frequency sending means for sending the stream error occurrence frequency to the network. ,
An error frequency input unit for inputting the stream error occurrence frequency to the video encoding device, and, when the stream error occurrence frequency increases, reducing a block ratio for motion compensation prediction in the video encoding device. In the case where the stream error occurrence frequency decreases, a moving image transmitting apparatus provided with a motion compensating means for increasing a block ratio for motion compensation prediction, and a recording means are provided. With this configuration, even when transmitted by a transmission path with poor transmission quality, as described above, it is possible to reduce the disturbance of the transmitted image and record it, and in a place where there is no wired line with good line quality. Can also transmit and record an image to a remote value, and can be used as a security device.

[0023]

Embodiments of the present invention will be described below with reference to the drawings. [First Embodiment] As shown in FIG.
The video encoding apparatus according to the embodiment, the macroblock counting unit 130 counts the number of encoded macroblocks and outputs an instruction to insert a synchronous macroblock, and inputs the instruction to insert the synchronous macroblock, a reference image Motion compensating prediction signal for motion compensating
a synchronous pattern creation instructing unit 132 to be turned on, and a motion compensating unit 120 that determines that motion compensation is effective in a compulsory motion compensation prediction macroblock to be used as a prediction image by performing motion compensation on the reference image. It is.

In FIG. 1, the inter / intra determination unit 100
A digital image signal obtained through a camera (not shown) and an A / D converter (hereinafter referred to as an input image signal) is compared with a motion-compensated predicted image output from the motion compensation unit 120 to perform intra-frame encoding. Or inter-frame predictive coding. The switch unit (No. 1) 102 receives the inter / intra determination result, the fixed value (0) input, and the motion compensated prediction image, and
If the r / intra judgment result is intra, 0 is output and inte
If the r / intra determination result is inter, a motion compensated prediction image is output. The orthogonal transform unit 104 determines that the inter / intra determination is intr
In the case of a, the input image signal is input, and in the case of inter, the prediction residual which is the difference between the input image signal and the motion compensated prediction image is input, and frame DCT (discrete cosine transform) or field DCT is performed. Is determined and converted. Quantization unit 106
Inputs an orthogonal transform coefficient and a quantization width, quantizes the orthogonal transform coefficient, and outputs a quantized orthogonal transform coefficient. VLC unit 108
Performs variable-length encoding of quantized orthogonal transform coefficients, intre / intra determination results, and block accompanying information such as motion compensation enable / disable. The buffer unit 110 temporarily stores the variable length code input at an indefinite speed, outputs the variable length code at a constant speed, and calculates and outputs a quantization width from the internally stored code amount. Inverse quantization unit
112 inputs the quantized orthogonal transform coefficients and inversely quantizes them, and outputs inverse quantized orthogonal transform coefficients. The inverse orthogonal transform unit 114
The inverse-quantized orthogonal transform coefficient is input, and inverse orthogonal transform is performed to output an inverse orthogonal transform coefficient. The frame memory unit 116 stores the inverse orthogonal transform coefficient and the output addition result of the switch unit (No. 2) described later. Switch section (No. 2) 118 has inter / intra judgment
When indicating intra, a fixed value 0 is output, and when indicating inter, a motion compensated prediction image is output. Motion compensation unit 12
0 inputs the input image signal, the image stored in the frame memory unit, the forced motion compensation prediction selection signal, and enables / disables the motion compensation prediction, the motion vector type, the motion vector, the motion compensation prediction image, and ends the macroblock processing. Output the trigger. The macroblock counting unit 130 inputs a macroblock processing end trigger, and outputs a synchronization pattern creation instruction every fixed number of macroblocks. The synchronization pattern creation instruction section 132 receives the synchronization pattern creation instruction and outputs a forced motion compensation prediction selection signal.

Next, a description will be given of a moving picture coding operation in the present embodiment. This embodiment assumes MPEG-2 (bit rate of 10 Mb / s or less, non-interlaced / interlaced compatible), which is an international standard for video coding.
In MPEG-2, a screen is divided into a number of macroblocks of a fixed size, and encoding is performed for each macroblock. Also,
In order to enhance the coding efficiency, the reference image is motion-compensated (a motion for each macroblock in which the correlation between the reference image and the input image is highest is detected, and an image is formed from the position indicated by the motion). An image method is used.

The inter / intra determination unit 100 receives an input image signal input in units of macroblocks and a motion-compensated predicted image output from the motion compensation unit 120, and calculates a variance value of the input image signal and an input image signal. Calculates the sum of squared differences of the motion-compensated predicted image.
(inter), and if equal or greater, select intra-frame coding (intra), and store the result in the VLC unit 108, switch unit (No.
1) Output to 102, switch section (No. 2) 118. Switch (N
o.1) 102, when the inter / intra determination unit 100 indicates intra, outputs a fixed value 0 to a subtractor (not shown), and causes the orthogonal transformation unit 104 to input an input image signal; When inter is indicated, a motion compensated prediction image is output to the subtractor, and the orthogonal transform unit 104 receives the prediction difference. The orthogonal transform unit 104 receives an input image signal or a prediction difference, and determines whether to perform DCT (discrete cosine transform) in a frame structure or to perform DCT by dividing into a field structure, and a correlation between adjacent lines and a correlation for each line. Judgment is made based on the magnitude, and the result is output to VLC section 108, and DCT is performed to output an orthogonal transform coefficient. The quantization unit 106 quantizes the orthogonal transform coefficient with the quantization width output from the buffer unit 110 and outputs the quantized orthogonal transform coefficient in order to reduce the information amount of the orthogonal transform coefficient.
The inverse quantization unit 112 receives the quantized orthogonal transform coefficients, inversely quantizes them with the same quantization width as that at the time of quantization, and outputs inverse quantized orthogonal transform coefficients. The inverse orthogonal transform unit 114 receives the inverse quantized orthogonal transform coefficient, performs an inverse orthogonal transform, and outputs an inverse orthogonal transform coefficient. The switch unit (No. 2) 118 outputs 0 to the adder when the inter / intra determination result indicates intra, and outputs the motion compensated prediction image to the adder when it indicates inter, A reproduced image including a quantization error is output to the memory unit 116. The VLC unit 108 calculates the quantized orthogonal transform coefficients, in
Input the ter / intra judgment result, motion compensation prediction accompanying information,
These are variable-length coded and output to the buffer unit 110.
The buffer unit 110 temporarily accumulates the variable-length code input at an indefinite speed, outputs the variable-length code at a constant speed, calculates a quantization width in proportion to the internally stored code amount, and outputs it to the quantization unit 106. The motion compensation unit 120 receives the input image signal, the reproduced image from the frame memory unit 116, and the forced motion compensation prediction selection signal from the synchronization pattern creation instruction unit 132, and unconditionally performs motion compensation prediction when the forced motion compensation prediction selection signal is ON. Is enabled, and the motion vector, motion-compensated predicted image, and accompanying information (motion-compensated prediction enabled / disabled, frame motion vector / field motion vector judgment result, and the reference image for a field motion vector are top field or bottomField Is output. Here, a specific example of the block matching method is described, for example, in "Band Compression and Coding Techniques for Images (Nikkan Kogyo Shimbun), pp. 61-62".

When the forced motion compensation prediction selection signal is OFF,
As a first step, a motion vector, a motion-compensated predicted image, and accompanying information of motion-compensated prediction are obtained by a block matching method. As a second step, a motion-compensated predicted image;
Whether any of the predicted images before the motion compensation prediction (when the motion amount is set to 0) has good coding efficiency is determined based on the sum of absolute differences with the input image signal. As a third step, the prediction image reflecting the determination result is inter / i-switched with the switch unit (No. 1) 102.
output to the ntra determination unit 100 and the accompanying information of the motion compensation
8, and outputs the above processing end trigger to the macroblock counting unit 130.

The macroblock counting section 130 receives a processing end trigger and outputs a synchronization pattern creation instruction signal to the synchronization pattern creation instruction section 132 for every fixed number of macroblocks. The synchronization pattern creation instructing unit 132 outputs the forced motion compensation prediction selection signal as ON when the synchronization pattern creation instruction signal is input, and outputs the forced motion compensation prediction selection signal as OFF when the synchronization pattern creation instruction signal is OFF, and performs motion compensation. Output to the unit 120.

As described above, the moving picture coding apparatus according to the first embodiment of the present invention includes a macroblock counting unit 130 that counts the number of coded macroblocks and outputs an instruction to insert a synchronous macroblock. When the synchronization macroblock insertion instruction is input, a synchronization pattern creation instructing unit 132 that turns on a forced motion compensation prediction signal for motion-compensating a reference image to form a prediction image, and performs motion compensation on the reference image to perform prediction. A motion compensation unit 120 that determines that motion compensation is effective is provided for a compulsory motion compensation prediction macroblock to be an image, and the motion compensation prediction macroblock is forcibly encoded for each fixed macroblock. Even when a bit error occurs and erroneous decoding of the variable length code starts from the error position, the motion compensation prediction No. (OFF) is received and it is possible to detect a bit error, it is possible to output a bit string that can be localized disturbance of image due to incorrect decoding of variable length codes.

[Second Embodiment] The configuration of a moving picture coding apparatus according to a second embodiment of the present invention is substantially the same as that of the first embodiment, and will be described with reference to FIG. . This is different from the first embodiment in that a motion compensation is determined to be valid in a forced motion compensation prediction macroblock to be used as a prediction image by performing motion compensation on a reference image, and a plurality of types of motion compensation modes are determined in advance. Motion compensator 12 for selecting a specified specific mode
The difference is that 0 is provided. With this configuration, a motion-compensated prediction macroblock using a frame motion vector is forcibly coded for each fixed macroblock, so that a bit error occurs at the time of image reproduction, and erroneous decoding of a variable-length code is performed from an error position. Even when it is started, the motion compensation prediction selection signal (OF
Since F) is received and a bit error can be detected, it is possible to output a bit string capable of localizing a disturbance of a video due to erroneous decoding of a variable-length code. In addition, since the synchronization pattern is configured by two types of conditions, that is, the motion compensation prediction is valid and the frame motion vector is selected, a bit error occurs,
When the variable length code is decoded erroneously, it is possible to obtain an effect that it is possible to reduce the possibility of accidental coincidence with the synchronization pattern and omission of detection.

In this embodiment, the motion compensating section 120 inputs an input image signal, a reproduced image from the frame memory section 116, and a forced motion compensation prediction selection signal from the synchronization pattern creation instructing section 132. When ON, motion compensation prediction is unconditionally enabled, and a frame motion vector, a frame motion compensation prediction image, and accompanying information (motion compensation prediction is valid, a frame motion vector is selected) are output by the block matching method. That is, in the forced motion compensation prediction macroblock, it is determined that the motion compensation is valid, and a predetermined specific mode is selected from among a plurality of types of motion compensation modes. Further, the block matching method used in the motion compensating unit 120 is specifically described in “Band Compression and Coding Techniques for Images (Nikkan Kogyo Shimbun), pp. 61-62” as described above.

When the compulsory motion compensation prediction selection signal is OFF, the motion compensation unit 120 obtains a frame motion vector and a field motion vector by a block matching method as a first step. Is good. As a second step,
Either the motion-compensated predicted image or the predicted image before motion-compensated prediction (when the motion amount is set to 0) has a good coding efficiency based on the sum of absolute differences between the input image signal and the input image signal. Third
As a step, a predicted image reflecting the determination result is output to the switch unit (No. 1) 102 and the inter / intra determination unit 100, and the accompanying information of motion compensation (valid / invalid of motion compensation prediction, frame motion vector / field motion If the vector judgment result is a field motion vector, the reference image is the top field or bottomFie
is output to the VLC unit 108, and a processing end trigger is output to the macroblock counting unit 130.

[Third Embodiment] The configuration of a moving picture coding apparatus according to a third embodiment of the present invention is substantially the same as that of the first embodiment, and will be described with reference to FIG. . This is different from the first embodiment in that a motion compensation unit that determines that motion compensation is valid and sets a motion amount to 0 is a forced motion compensation prediction macroblock to be used as a prediction image by performing motion compensation on a reference image.
The point that 120 is provided is different. According to this configuration, a macroblock having motion compensation enabled for each fixed macroblock and having a motion vector of 0 is encoded. Therefore, a bit error occurs during image reproduction, and an erroneous decoding of a variable length code is performed from an error position. Is started, a bit string in which the motion compensation is valid and the motion vector is not 0 is received in the forced motion compensation prediction macroblock, and a bit error can be detected. There is also obtained an effect that a bit string capable of localizing disturbance can be output. In addition, even for an input image having little motion, the motion vector motion compensation unit is set to 0 in the forced motion compensation prediction macroblock, so that the synchronization pattern can be inserted into the bit string without deteriorating the image quality. Is also obtained.

In this embodiment, the motion compensating section 120 inputs an input image signal, a reproduced image from the frame memory section 116, and a forced motion compensation prediction selection signal from the synchronization pattern creation instructing section 132. When ON, the motion compensation prediction is unconditionally enabled, the motion vector is set to 0,
A predicted image with the motion vector set to 0 and accompanying information (motion compensated prediction is valid) are output. When the forced motion compensation prediction selection signal is OFF, as a first step, a frame motion vector and a field motion vector are obtained by a block matching method, and it is determined which of the motion vectors has a good evaluation value by the block matching method. . As a second step, it is determined whether any one of the motion-compensated predicted image and the predicted image before the motion-compensated prediction (when the motion amount is set to 0) has a good coding efficiency by a sum of absolute differences between the input image signal and the input image signal. .
As a third step, a predicted image reflecting the determination result is output to the switch unit (No. 1) 102 and the inter / intra determination unit 100,
Additional information of motion compensation (valid / invalid of motion compensation prediction, frame motion vector / field motion vector judgment result, in case of field motion vector, reference image is top field
Is output to the VLC unit 108, and a processing end trigger is output to the macroblock counting unit 130.

[Fourth Embodiment] FIG. 2 shows a fourth embodiment of the present invention.
1 shows a configuration of a moving image encoding device according to an embodiment. The configuration and operation of this embodiment are substantially the same as those of the first embodiment except for the motion compensation unit 120, the inter / intra determination unit 100, and the synchronization pattern creation instruction unit 132. The description is omitted here. This is the first embodiment,
When a synchronization macroblock insertion instruction is input, a synchronization pattern creation instructing unit 132 that turns on a forced intra-frame encoding selection signal for unconditionally performing intra-frame encoding, and a target for unconditionally performing intra-frame encoding Integer to select intra-frame coding in forced intra-frame macroblock of
The difference is that an r / intra determination unit 100 is provided. According to this configuration, since the intra-coded macroblock is encoded for each fixed macroblock, even when a bit error occurs during image reproduction and erroneous decoding of the variable-length code is started from the error position, In the forced intra-coded macroblock, a bit string other than the intra-coded macroblock is received, and a bit error can be detected. The effect that a possible bit string can be output is also obtained. In addition, since an intra-frame coded macroblock is inserted for each fixed macroblock, there is an advantage that a mismatch due to error propagation (reproduced images held internally in the encoding device and the decoding device are different) is reset. The effect that it can be obtained is also obtained.

In FIG. 2, as a first step, the motion compensation unit 120 obtains a motion vector, a motion-compensated predicted image, and accompanying information of the motion-compensated predicted by a block matching method. As a second step, it is determined whether any one of the motion-compensated predicted image and the predicted image before the motion-compensated prediction (when the motion amount is set to 0) has a good coding efficiency by a sum of absolute differences between the input image signal and the input image signal. . As a third step, a predicted image reflecting the determination result is output to the switch unit (No. 1) 102 and the inter / intra determination unit 100, the accompanying information of the motion compensation is output to the VLC unit 108, and a processing end trigger is output. Output to macro block counting section 130.

When the macroblock counting unit instructs to create a synchronization pattern, the synchronization pattern creation instructing unit 132 outputs a forced intra-frame coding selection signal ON to the inter / intra determination unit 100, and inputs a synchronization pattern creation instruction. At other times, the forced intra-frame encoding selection signal (OFF) is output to the inter / intra determination unit 100.

The inter / intra determination unit 100 includes an input image signal input in units of macroblocks, a motion-compensated prediction image output by the motion compensation unit 120, and a forced intra-frame encoding selection output by the synchronization pattern creation instruction unit. When the signal is input and the forced intra-frame coding selection signal (ON) is input, the intra-frame coding is unconditionally selected. When the forced intra-frame coding selection signal (OFF) is input, the variance value of the input image signal and Calculate the sum of squared differences between the input image signal and the motion-compensated predicted image.If the sum of squared differences is small, select inter-frame predictive coding (inter) .If equal or greater, select intra-frame coding (intra). To the VLC unit 108, the switch unit (No. 1) 102, and the switch unit (No. 2) 118. Also, the inter / intra determination unit 10
A value of 0 outputs a processing end trigger to the macroblock counting unit 130.

As described above, the operation of the motion compensator 120 in the present embodiment is different from the function of the motion compensator 120 in the first embodiment in that the function of executing the forced motion compensation at the time of the forced motion compensation prediction input is deleted. Things.

[Fifth Embodiment] FIG. 3 shows a fifth embodiment of the present invention.
1 shows a configuration of a moving image encoding device according to an embodiment. The configuration and operation of the present embodiment include a motion compensation unit 120, an orthogonal transformation unit 104,
Except for the synchronization pattern creation instructing unit 132, the configuration is substantially the same as that of the first embodiment. This is different from the first embodiment in that when a synchronous macroblock insertion instruction is input, a synchronous pattern creation instructing unit 132 that turns on a forced frame DCT selection signal for performing discrete cosine transform in a frame structure, When the selection signal is ON, the orthogonal transform unit 104 unconditionally selects the frame discrete cosine transform and performs the orthogonal transform.
Are provided. According to this configuration, the macroblock in which the frame DCT is selected for each fixed macroblock is encoded, so that a bit error occurs during image reproduction, and erroneous decoding of the variable-length code is started from the error position. Also, in the forced frame DCT selection macroblock, bit strings other than frame DCT macroblock are received and bit errors can be detected, so it is possible to localize video disturbance due to erroneous decoding of variable length code Also, an effect that a simple bit string can be output can be obtained. Also, in a macroblock that is not originally an interlace signal, such as an animation image, an effect is obtained that a synchronization pattern can be inserted without lowering the coding efficiency even if frame DCT is forcibly performed.

In FIG. 3, as a first step, the motion compensation unit 120 obtains a motion vector, a motion-compensated predicted image, and accompanying information of the motion-compensated predicted by a block matching method. As a second step, it is determined whether any one of the motion-compensated predicted image and the predicted image before the motion-compensated prediction (when the motion amount is set to 0) has a good coding efficiency by a sum of absolute differences between the input image signal and the input image signal. . As a third step, the prediction image reflecting the determination result is output to the switch unit (No. 1) 102 and the inter / intra determination unit 100, and the accompanying information of the motion compensation is output to the VLC unit 108.

The synchronization pattern creation instructing section 132 outputs the forced frame DCT selection signal (ON) to the orthogonal transformation section 1 when the macroblock counting section 130 instructs the synchronization pattern creation.
04, and outputs a forced frame DCT selection signal (OFF) to the orthogonal transform unit 104 except when a synchronization pattern creation instruction is input.

When the forced frame DCT selection signal output from the synchronization pattern creation instructing unit 132 is ON, the orthogonal transform unit 104 unconditionally selects a DCT within the frame and performs DCT conversion. When OFF, DC is used in the frame structure
T (discrete cosine transform) or DCT by dividing into a field structure is determined based on the correlation between adjacent lines and the magnitude of the correlation for each line, and the result is output to the VLC unit 108, and the DCT transform is performed. Execute to output orthogonal transform coefficients. Further, orthogonal transform section 104 outputs a processing end trigger to macroblock counting section 130.

As described above, the motion compensation unit 120 according to the present embodiment
The operation of is obtained by removing the function of the forced motion compensation at the time of inputting the forced motion compensation prediction from the function of the motion compensation unit 120 of the first embodiment.

[Sixth Embodiment] FIG. 4 shows a sixth embodiment of the present invention.
1 shows a configuration of a moving image encoding device according to an embodiment. The configuration and operation of the present embodiment include a motion compensation unit 120, an orthogonal transformation unit 104,
Except for the synchronization pattern creation instructing unit 132, the configuration is substantially the same as that of the first embodiment. This is different from the first embodiment in that a synchronization pattern creation instructing unit 132 that outputs a fixed quantization width (a preset quantization width) when a synchronization macroblock insertion instruction is input is provided. I have. According to this configuration, since a macroblock quantized with a fixed quantization width is encoded for each fixed macroblock, a bit error occurs at the time of image reproduction, and erroneous decoding of a variable length code is performed from an error position. Even in the case of starting, since a bit string other than the fixed quantization width is received by the synchronization pattern creation instruction macro block and a bit error can be detected, video disturbance due to erroneous decoding of a variable length code is localized. Also, an effect that a bit string that can be output can be obtained. Further, since a code length of about 5 bits is usually used for the quantization width, when a bit error occurs, the probability of error detection omission due to coincidence of 5 bits with the fixed quantization width by chance is low, and it is steady. The effect that an error can be detected is also obtained.

In FIG. 4, as a first step, the motion compensating unit 120 obtains a motion vector, a motion-compensated predicted image, and accompanying information of the motion-compensated predicted by a block matching method. As a second step, it is determined whether any one of the motion-compensated predicted image and the predicted image before the motion-compensated prediction (when the motion amount is set to 0) has a good coding efficiency by a sum of absolute differences between the input image signal and the input image signal. . As a third step, the prediction image reflecting the determination result is output to the switch unit (No. 1) 102 and the inter / intra determination unit 100, and the accompanying information of the motion compensation is output to the VLC unit 108.

When the macroblock counting unit 130 instructs the synchronization pattern creation, the synchronization pattern creation instructing unit 132 sets the predetermined quantization width to the quantization unit 106 and the VLC unit 108.
And outputs the quantization width output from the buffer unit 110 to the quantization unit 106 and the VLC unit 108 except when the synchronization pattern creation instruction is input.

As described above, the motion compensator 120 of the present embodiment
The operation of (1) is obtained by removing the function of performing the forced motion compensation at the time of inputting the forced motion compensation prediction from the function of the motion compensation unit 120 of the first embodiment.

[Seventh Embodiment] As shown in FIG.
A moving image transmission device according to a seventh embodiment of the present invention
A video encoding device according to the sixth embodiment, a video decoding device including a synchronous macroblock determining unit 240, a synchronous pattern checking unit 250, a motion compensating unit 210, a switch unit 200, and an adding unit 205; Network I / Fs 140 and 150 connecting the image encoding device and the video decoding device are provided, and when a synchronization pattern is abnormal, an image at the same location of the previous frame is output again. According to this configuration, even when a bit error occurs in the transmission path and erroneous decoding of the variable length code is started from the error position, a bit string other than the synchronization pattern is received by the synchronization pattern creation macro block. , Bit errors can be detected. If a bit error is detected, the same video as the reference image is output by the motion compensation unit 210 and the switch unit 200, and a video in which the disturbance of the video due to erroneous decoding of the variable length code is localized is output to the monitor. The effect of being able to do so is also obtained.

In FIG. 5, a network I / F section 140 on the moving picture encoding apparatus side receives a transmission bit string from the decoding apparatus side, constructs a signal required by the network section, and outputs a bit string to the network. . Note that the configuration and operation of the video encoding device of the present embodiment are the same as those of the network I / F unit 1.
Since the configuration is the same as that of the first embodiment except for 40, the same components are denoted by the same reference numerals and description thereof is omitted.

On the other hand, the network on the video decoding device side
The I / F section 150 constructs a reception bit string from a signal input from the network. The buffer unit 160 temporarily accumulates the input bit string and outputs it for each macroblock at the timing requested by the VLD unit 170. VLD section 170 decodes the bit string and outputs an inter / intra determination result, motion compensation accompanying information, quantization width, and quantized orthogonal transform coefficient. Inverse quantization unit 180
Performs inverse quantization and outputs an inversely quantized orthogonal transform coefficient including a quantization error. The inverse orthogonal transform unit 190 performs an inverse orthogonal transform and outputs an inverse orthogonal transform coefficient. Frame memory section 220
Accumulates a reproduced image including quantization noise. The motion compensation unit 210 receives the reference image, the stream error information, and the motion compensation accompanying information, and creates and outputs a motion compensation predicted image. The switch unit 200 inputs the inter / intra determination result and the stream error information and outputs a reference image. Monitor section
230 outputs the decoding result. The synchronous macroblock determining unit 240 determines whether the macroblock is a compulsory motion compensation prediction macroblock inserted for each fixed number of macroblocks. The synchronization pattern check unit 250 detects a stream error from motion compensation enable / disable and forced motion compensation prediction macroblock determination.

Next, the moving picture encoding / decoding operation of the present embodiment will be described. The operation in the video encoding device is as follows.
This is the same as the first embodiment except for the network I / F 140.

The network I / F 140 receives a bit string as an encoding result of the input macroblock from the buffer unit 110, constructs a packet defined in the required specifications of the network, and transfers the packet to the network. Here, assuming an IEEE.1394 network, a specific example of a network and a packet is, for example, "High-speed interface in IEEE1394 digital age, Nikkei Electronics Seminar Special Supplement"
It is described in.

The network I / F 150 extracts a bit string transmitted from the network for each packet, and outputs it to the buffer unit 160. Buffer section 160 accumulates the input bit string internally and outputs the bit string to the VLD section in macroblock units. The VLD unit 170 inputs the bit string in units of macroblocks, decodes the bits according to the variable length code table, and determines whether motion compensation is valid / invalid to the motion compensation unit 210 and the synchronization pattern check unit 250,
(Frame motion vector / field motion vector judgment result,
In the case of a field motion vector, the reference image is top field
Or bottomField) to the motion compensation unit 210, int
The er / intra determination is output to the switch unit 200, the quantized orthogonal transform coefficient and the quantization width are output to the inverse quantization unit 180, and the macroblock processing end trigger is output to the synchronous macroblock determination unit 240. Inverse quantization section 180 inversely quantizes the quantized orthogonal transform coefficients using the quantization width input from VLD section 170, and outputs the inversely quantized orthogonal transform coefficients to inverse orthogonal transform section 190. The inverse orthogonal transform unit 190 performs an inverse orthogonal transform on the inverse quantized orthogonal transform coefficient, and outputs the inverse orthogonal transform coefficient to the adder. In addition, the inverse orthogonal transform unit
The inverse orthogonal transform coefficient output by 190 is an input image signal including a quantization error in the case of an intra-frame coded macroblock (intra), and is an inter-frame prediction coded macroblock (i
nter) is a prediction difference signal including a quantization error.
The predicted image and the fixed value 0 are input to the adder 205 based on the inter / intra result output from the VLD unit.
The output of the adder 205 is a reproduced macro block including a quantization error, and is output to the frame memory unit 220. The synchronous macroblock determining unit 240 inputs a macroblock processing end trigger, determines whether or not the input macroblock is a forced motion compensation predicted macroblock inserted for each fixed macroblock, and sends the result to the synchronous pattern checking unit 250. Output. The synchronization pattern check unit 250 is a case where the output of the synchronous macroblock determination unit 240 indicates that the macroblock is a forced motion compensation prediction macroblock, and the motion compensation valid / invalid output from the VLD unit 170 is valid. Determines that a transmission error has not occurred, and if invalid, determines that a transmission error has occurred, and outputs the result to the motion compensation unit 210, the switch unit 200, and the adder 205. Frame memory section 22
A value of 0 stores the reproduced image output by the adder 205 inside, and outputs the reproduced image to the motion compensation unit 210 and the monitor unit 230 at the timing requested by each.

The motion compensation unit 210 receives the reference image from the frame memory unit 220, the motion compensation prediction accompanying information from the VLD unit 170, and the stream error information from the synchronization pattern check unit 250, and if no stream error has occurred, A predicted image subjected to motion compensation according to the motion-compensated prediction accompanying information is output. If a stream error has occurred, a predicted image with zero motion is output. The switch unit 200 inputs the predicted image, the inter / intra determination result, and the stream error information, and sets the fixed value 0 only when the inter / intra determination result indicates intra and the stream error information does not indicate that an error has occurred. Otherwise, the output of the motion compensation unit 210 is output as it is. Monitor section 230 displays the input signal. The adder 205 is configured to output the stream error information and the switch unit 2
From 00, the predicted image and the inverse orthogonal transform coefficient from the inverse orthogonal transform unit 190 are input, and if an error occurs, the input from the switch unit 200 is output to the frame memory unit 220 as it is, otherwise, the inverse orthogonal transform unit The addition of the output of 190 and the output of switch unit 200 is output to frame memory unit 220.

[Eighth Embodiment] FIG. 6 shows an eighth embodiment of the present invention.
1 shows a configuration of a moving image transmission device according to an embodiment. The configuration and operation of the moving image transmission apparatus of the present embodiment are performed by the macro block counting unit 130, the network I / F 140, and the network I / F 15
Except for the synchronization macroblock determination unit 240 and the synchronization pattern check unit 250, the configuration is almost the same as that of the seventh embodiment.
This is different from the seventh embodiment in that a synchronous pattern check unit that measures the frequency of occurrence of stream errors in a video decoding device
250, a network I / F 150 for sending the stream error occurrence frequency to a network for transmission to the video encoding device, and a network I / F for inputting the stream error occurrence frequency from the network to the video encoding device. F140, when the stream error occurrence frequency increases, the moving picture coding apparatus narrows the insertion interval of the synchronous macroblock, while the stream error occurrence frequency decreases, the synchronous macroblock Synchronous macroblock determination unit 240 that extends the insertion interval,
The difference is that a macro block counting unit 130 is provided. According to this configuration, the forced motion compensation prediction macroblock interval is automatically adjusted according to the error occurrence frequency, so that synchronized macroblocks can be inserted at appropriate intervals, and motion compensation that is originally unnecessary for an input image with little motion can be performed. There is also obtained an effect that an increase in the code amount due to transmission of a certain macroblock can be reduced.

In FIG. 6, the synchronization pattern check section 25
0 tallies the bit error occurrence frequency, and according to the relational expression between the predetermined occurrence frequency and the forced motion compensation prediction macroblock interval, sets the forced motion compensation prediction macroblock interval to the synchronous macroblock determination unit 240 and the network I / F 150 unit. Output to

The synchronous macroblock determining unit 240
Input the macroblock processing end trigger from 0 and the forced motion compensation predicted macroblock interval from the synchronization pattern check unit 250, judge whether the input macroblock is the forced motion compensation predicted macroblock, and check the result for the synchronization pattern Output to the unit 250.

The network I / F sections 150 and 140 transmit the macro block interval of the forced motion compensation prediction macro block to the macro block counting section 130.

The macroblock counting unit 130 receives a processing end trigger and a forced motion compensation prediction macroblock interval, and outputs a synchronization pattern creation instruction signal to the synchronization pattern creation instruction unit 132 at each designated macroblock interval.

[Ninth Embodiment] FIG. 7 shows a ninth embodiment of the present invention.
1 shows a configuration of a moving image transmission device according to an embodiment. The configuration and operation of the moving image transmission device of the present embodiment includes a motion compensation unit 120,
Except for the network I / F unit 140, the network I / F unit 150, the synchronization macroblock determination unit 240, and the synchronization pattern check unit 250, the configuration is almost the same as that of the eighth embodiment, and the same components are denoted by the same reference numerals. And the description is omitted. This is the eighth
And the synchronization pattern check unit 250 that outputs the horizontal position and the vertical position in the screen where the stream error has occurred in the video decoding device, and the network I / O that sends the horizontal position and the vertical position to the network. F section 150,
The network position I / F unit 140 for inputting the horizontal position and the vertical position to the video encoding device, and the motion compensation unit 120 for suppressing the horizontal position and the vertical position from being a reference image at the time of motion compensation prediction. The provided point is different. According to this configuration, the macroblock in which the bit error has occurred is not used for motion compensation prediction, so that the video is disturbed by the bit error, and motion compensation prediction is performed from that position, and the disturbance of the video is expanded spatially and temporally. This can also provide an effect that it is possible to prevent the user from doing so.

In FIG. 7, the synchronization pattern check section 25
0 is the spatial position of the macroblock where the bit error occurred (the horizontal position in the screen where the stream error occurred,
(Vertical position) to the network I / F 150.

Network I / F sections 150 and 140 determine the spatial position of the bit error-occurring macroblock by motion compensating section 120.
Transmit to

The compensator 120 obtains a motion vector by excluding the bit error occurrence position from the motion vector search range for motion compensation prediction.

[Tenth Embodiment] A moving picture transmission apparatus according to a tenth embodiment of the present invention has
0, except for the network I / F unit 140, the network I / F unit 150, and the synchronization pattern check unit 250, which are almost the same as those in the ninth embodiment, and will be described with reference to FIG. This is different from the ninth embodiment in that, when the stream error occurrence frequency of the video decoding device increases, the block error ratio for which motion compensation prediction is performed by the video encoding device is reduced, while the stream error occurrence frequency is reduced. The difference is that a motion compensating unit 120 that increases the block ratio for motion compensation prediction when the motion compensating unit is lowered is provided. According to this configuration, when the frequency of occurrence of bit errors is high, the number of motion-compensated prediction macroblocks is reduced, the video is disturbed by the bit error, and motion compensation prediction is performed from that position, and the disturbance of the video is expanded spatially and temporally. The effect that it can be prevented from being performed can be obtained.

The synchronization pattern check section 250 counts the frequency of occurrence of a macroblock in which a bit error has occurred, and outputs the result to the network I / F 150.

The network I / F sections 150 and 140 transmit the frequency of occurrence of the bit error-occurring macroblock to the motion compensation section 120.

The motion compensating unit 120 changes the algorithm for determining whether motion compensation prediction is valid or invalid from the relational expression between the predetermined bit error frequency and the motion compensation prediction macroblock selection ratio. The number of macroblocks for selecting the effective compensation prediction is reduced. Specifically, from the algorithm that selects the smaller of the sum of the absolute values of the prediction differences for each of the motion compensation enable / disable,
1.5 times the "sum of predicted difference absolute values when motion compensation is enabled" is compared with the "sum of predicted difference absolute values when motion compensation is disabled". If the former is small, the motion compensation prediction is enabled; otherwise, In such a case, an example in which the motion compensation prediction macroblock is difficult to be selected by changing the algorithm to determine that the motion compensation prediction is invalid can be given.

[Eleventh Embodiment] As shown in FIG. 8, a moving image transmission and recording apparatus according to an eleventh embodiment of the present invention comprises a moving image transmission apparatus and an image recording apparatus according to the seventh embodiment.
260. According to this configuration, even if a bit error occurs, a video of good image quality can be displayed and recorded at a remote value, and a security system for monitoring various stores that requires video recording can be configured. The effect that can be obtained is also obtained.

In FIG. 8, a moving image transmitting apparatus 400 includes:
It comprises a moving picture coding apparatus 200 and a moving picture decoding apparatus 300, and is further connected to an image recording apparatus 260. The image recording device 260 records a moving image transmitted from the moving image encoding device 200 via a network. As a specific example,
Consumer VHS video decks, DVD recorders and the like can be mentioned.

[Twelfth Embodiment] A moving image transmission apparatus according to a twelfth embodiment of the present invention is different from the eleventh embodiment (FIG. 8) in that the moving image transmission apparatus 400 is replaced by an eighth embodiment. (FIG. 6). According to this configuration, even if a bit error occurs, a video of good image quality can be displayed and recorded at a remote value, and a security system for monitoring various stores that requires video recording can be configured. The effect that can be obtained is also obtained.

[Thirteenth Embodiment] A moving picture transmission apparatus according to a thirteenth embodiment of the present invention is different from the twelfth embodiment (FIG. 8) in that a moving picture transmission apparatus 400 is different from the ninth embodiment. (FIG. 7). According to this configuration, even if a bit error occurs, a video of good image quality can be displayed and recorded at a remote value, and a security system for monitoring various stores that requires video recording can be configured. The effect that can be obtained is also obtained.

[Fourteenth Embodiment] A moving image transmission apparatus according to a fourteenth embodiment of the present invention is different from the thirteenth embodiment (FIG. 8) in that a moving image transmission apparatus 400 is different from the tenth embodiment. (FIG. 8). According to this configuration, even if a bit error occurs, a video of good image quality can be displayed and recorded at a remote value, and a security system for monitoring various stores that requires video recording can be configured. The effect that can be obtained is also obtained.

The VLC unit 108 and the like constitute the encoding means, the switch unit 200, the adder 205 and the like constitute the image reproducing means, and the macroblock counting unit 130 and the like constitute the macroblock counting means. , The inter / intra determination unit 100 and the like constitute the interlace / non-interlace determination unit, the orthogonal transformation unit 104 and the like constitute the orthogonal transformation unit, and the synchronous macroblock determination unit 240 and the like constitute the synchronous macroblock determination unit. The synchronous pattern checking unit 250 and the like constitute the synchronous pattern checking means, the motion compensating unit 120 and the like constitute the motion compensating means, the adder 205 and the like constitute the adding means, the switch unit 200 and the like. Constitute the switch means, the network, network I / F sections 140 and 150 constitute the transmission means, and the synchronization pattern check section 250 and the like constitute the switch means. -Constitute a measuring means, the motion compensating section 120 and the like constitute the insertion interval changing means, the network I / F section 150 and the like constitute the error frequency sending means, the network I / F section 140 and the like constitute the error frequency The input means is constituted, the synchronization pattern check section 250 and the like constitute position output means, the network I / F section 150 and the like constitute position sending means, and
The I / F unit 140 and the like constitute a position input unit, and the motion compensation unit 120
And the like constitute reference suppression means, and the image recording device 260 and the like constitute the recording means.

[0075]

According to the present invention, simple error detection can be performed without using a conventional error correction code. For example, when performing moving picture encoding, a fixed bit pattern for synchronization confirmation is inserted into a bit stream for each macroblock at a fixed interval, and a synchronization pattern check unit is provided to detect occurrence of an error in a transmission path. There is no need to add a redundant code as in a normal error correction method, and the addition of the redundant code does not lower the transmission efficiency. Further, by feeding back the bit error occurrence status from the video decoding device to the video encoding device, it is possible to easily adjust the insertion interval of the synchronization confirmation pattern. Furthermore, it is possible to easily cope with a moving image transmission device using a wireless transmission path, and even when a transmission path error occurs, it is possible to localize image disturbance spatially / temporally and maintain image quality.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a moving image encoding device according to first to third embodiments of the present invention.

FIG. 2 is a block diagram illustrating a configuration of a moving picture encoding device according to a fourth embodiment of the present invention.

FIG. 3 is a block diagram showing a configuration of a moving picture coding apparatus according to a fifth embodiment of the present invention.

FIG. 4 is a block diagram showing a configuration of a video encoding device according to a sixth embodiment of the present invention.

FIG. 5 is a block diagram illustrating a configuration of a moving image transmission device according to a seventh embodiment of the present invention.

FIG. 6 is a block diagram illustrating a configuration of a moving image transmission device according to an eighth embodiment of the present invention.

FIG. 7 is a block diagram illustrating a configuration of a moving image transmission device according to ninth and tenth embodiments of the present invention.

FIG. 8 is a block diagram illustrating a configuration of a moving image transmission device according to the first to fourteenth embodiments of the present invention.

[Explanation of symbols]

 100 inter / intra determination unit 102 switch unit (No. 1) 104 orthogonal transform unit 106 quantization unit 108 VLC unit 110 buffer unit 112 inverse quantization unit 114 inverse orthogonal transform unit 116 frame memory unit 118 switch unit (No. 2) Reference Signs List 120 motion compensation unit 130 macroblock counting unit 132 synchronization pattern creation instruction unit 140, 150 network I / F unit 160 buffer unit 170 VLD unit 180 inverse quantization unit 190 inverse orthogonal transformation unit 200 switch unit 205 adder 210 motion compensation unit 220 Frame memory unit 230 Monitor unit 240 Synchronous macroblock determining unit 250 Synchronous pattern check unit

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor, Seiki Sekine 4-3-1 Tsunashimahigashi, Kohoku-ku, Yokohama-shi, Kanagawa F-term (reference) in Matsushita Communication Industrial Co., Ltd. 5C059 KK01 LA07 MA00 MA04 MA05 MA23 MC11 ME01 NN21 NN28 RB12 RC02 RC16 RF01 RF28 SS11 TA24 TA46 TB07 TC03 TC11 TD04 TD06 UA02 UA05 5J064 AA01 BA09 BA16 BB03 BC01 BC05 BC16 BD02 BD03

Claims (15)

[Claims] 1. Counting the number of coded macroblocks,
Macroblock counting means for instructing the insertion of a synchronous macroblock for each of a fixed number of macroblocks, and one item in the macroblock ancillary information from which various kinds of selectable macroblocks can be encoded to a fixed value by the synchronous macroblock. A synchronization pattern creation instructing means for outputting an instruction, an encoding means for encoding a fixed value in accordance with the instruction of the synchronization pattern creation instructing means, a synchronous macroblock determining means for determining whether or not the synchronous macroblock, In a synchronous macroblock, a synchronous pattern check means for detecting whether or not a fixed value of macroblock accompanying information is the same as the value at the time of encoding and detecting a bit error; A moving image transmission apparatus comprising: an image reproducing unit that uses a reference image as a reproduced image. 2. A macroblock counting means for counting the number of coded macroblocks and outputting an instruction to insert a synchronous macroblock, and receiving the instruction to insert a synchronous macroblock, motion-compensating a reference image to generate a predicted image and A synchronous pattern creation instructing unit for turning on a forced motion compensation prediction signal for performing motion compensation, and a motion for which motion compensation is effective in a compulsory motion compensation prediction macroblock to be subjected to motion compensation for the reference image as a prediction image. A moving picture coding apparatus comprising a compensation means. 3. A macroblock counting means for counting the number of coded macroblocks and outputting an instruction to insert a synchronous macroblock, and receiving the instruction to insert a synchronous macroblock, motion-compensating a reference image to generate a predicted image and A synchronous pattern creation instructing means for turning on a forced motion compensation prediction signal for performing motion compensation, and a motion compensation compensation prediction macroblock to be used as a prediction image by performing motion compensation on the reference image, and determine that motion compensation is valid; and A moving image encoding apparatus, comprising: a motion compensation unit that selects a predetermined specific mode from among a plurality of types of motion compensation modes. 4. A macroblock counting means for counting the number of encoded macroblocks and outputting an instruction to insert a synchronous macroblock, and receiving the instruction to insert a synchronous macroblock, motion-compensating a reference image to generate a predicted image and A motion pattern compensating prediction signal for turning on the reference pattern, a motion compensating prediction macroblock to be used as a prediction image by motion compensating the reference image, and determining that motion compensation is valid; and A moving picture encoding apparatus, comprising: a motion compensating unit for setting a motion amount to zero. 5. A macroblock counting means for counting the number of coded macroblocks and outputting an instruction to insert a synchronous macroblock, and receiving the instruction to insert a synchronous macroblock to unconditionally perform intra-frame encoding. A synchronous pattern creation instructing means for turning on the forced intra-frame encoding selection signal, and an interlaced / interlaced / macro-coded macroblock to be subjected to unconditional intra-frame encoding. A moving picture coding apparatus comprising a non-interlace determining means. 6. A macroblock counting means for counting the number of coded macroblocks and outputting an instruction to insert a synchronous macroblock, and for inputting the instruction to insert a synchronous macroblock, forcibly performing discrete cosine transform in a frame structure. Synchronous pattern creation instructing means for turning on the frame discrete cosine transform selection signal; and orthogonal transform means for unconditionally selecting the frame discrete cosine transform and orthogonally transforming when the forced frame discrete cosine transform selection signal is on. A moving picture encoding device, comprising: 7. A macroblock counting means for counting the number of coded macroblocks and outputting a synchronous macroblock insertion instruction, and generating a synchronous pattern for outputting a fixed quantization width when the synchronous macroblock insertion instruction is input. A moving picture coding apparatus comprising an instruction unit. 8. A moving picture encoding apparatus according to claim 2, further comprising: a moving picture decoding apparatus connected to said moving picture encoding apparatus by a transmission means. The apparatus further counts the number of decoding macroblocks, outputs a synchronization pattern check instruction for each macroblock at a predetermined interval, and inputs a synchronization pattern check instruction. A synchronization pattern checking unit that determines a stream error based on whether a synchronization pattern is included, a motion compensation unit that outputs a reference image at the same position as the decoded macroblock when a stream error occurs, and outputs the reference image. Switch means and an addition means for outputting a reproduced image. A moving image transmitting apparatus for outputting an image of the same location of a moving image again. 9. An error measuring unit for measuring a stream error occurrence frequency in the video decoding device, and an error frequency sending unit for sending the stream error occurrence frequency to a network for transmission to the video encoding device. Error frequency input means for inputting the stream error occurrence frequency from the network to a video encoding device, and, when the stream error occurrence frequency increases, the video encoding device sets an insertion interval of the synchronous macroblock. 9. An insertion interval changing means for increasing an insertion interval of the synchronous macroblock when the stream error occurrence frequency decreases while narrowing the interval.
5. The moving image transmission device according to item 1. 10. A position output means for outputting a horizontal position and a vertical position in a screen where a stream error has occurred in the video decoding device, a position sending means for sending the horizontal position and the vertical position to the network, The horizontal position and the vertical position are input to the moving image encoding device position input means, and the horizontal position, the vertical position is provided with reference suppression means for suppressing the reference image at the time of motion compensation prediction provided that The moving picture transmission device according to claim 8, wherein 11. An error measuring means for measuring a stream error occurrence frequency in the video decoding device, an error frequency sending means for sending the stream error occurrence frequency to the network, and an error frequency sending means for sending the stream error occurrence frequency to the moving image. Error frequency input means for inputting to the encoding device;
When the stream error occurrence frequency increases, the block ratio for motion compensated prediction in the video encoding device decreases, while when the stream error occurrence frequency decreases, the block ratio for motion compensated prediction increases. 9. A motion compensating means for causing motion compensation is provided.
5. The moving image transmission device according to item 1. 12. The moving picture transmission device according to claim 8, wherein:
A moving image transmission / recording apparatus comprising a recording means. 13. The moving picture transmission device according to claim 9,
A moving image transmission / recording apparatus comprising a recording means. 14. A moving image transmission and recording device comprising the moving image transmission device according to claim 10 and recording means. 15. A moving picture transmission and recording apparatus comprising the moving picture transmission apparatus according to claim 11 and a recording means.