JPH11275573A - Video encoding device, video decoding device, video encoding method and video decoding method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce video quality deterioration due to transmission errors by decomposing coded video information into information classes, inserting a boundary code into a boundary between the decomposed information classes and synthesizing and transmitting a transmission coded string. SOLUTION: Processing in a transmission code string generating part 12 first resets a data length counter that is provided in each data type. Next, motion vector information and encoded video information which are results obtd. by encoding an input video signal are inputted to the part 12 from an information source encoding part 11. An encoded information decomposing part 13 classifies these information in each kind and sends them to a code string synthesizing part 14. The part 14 arranges the information into a prescribed format based on a prescribed rule, synthesizes one code string and outputs it. In such a case, the part 14 inserts a boundary code into the boundary in the case of combining different kinds of information. Also, even when the same kind of information continues, a synchronous marker code is inserted at prescribed intervals.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video encoding process for compressing and reducing the amount of information contained in a video (moving image) signal, and decoding a video signal by decoding the encoded information. The present invention relates to a video decoding process for restoring, and more particularly to a process that requires resistance to transmission errors, such as a mobile communication network.

[0002]

2. Description of the Related Art In recent years, PHS (Personal Ha) has been developed.
The development and spread of mobile communication networks such as ndy phone system) and digital cellular networks are rapidly progressing, and image communication, which has traditionally focused on wired networks such as ISDN, can be applied to mobile communication. Have been done.

Generally, since the amount of information contained in video information is very large, it is impossible to transmit a video signal as it is, particularly on a transmission path having a small transmission capacity such as mobile communication. Therefore, since the video signal contains a great deal of redundancy in the information, it is possible to reduce (compress) the amount of information by removing this redundancy.
For this reason, highly efficient video (compression) encoding technology is important. For this reason, ITU-T and ISO / IEC are working on international standardization of video coding systems at ultra-low bit rates.

A video signal includes temporal information due to a change in motion or the like included in the video and spatial information related to the content of one image (image frame or image field, hereinafter, referred to as an image frame) signal. There are two pieces of information, each of which has redundancy.

In the motion-compensated inter-frame prediction orthogonal transform coding method, spatial redundancy is removed by motion-compensated inter-frame prediction, and then spatial transform is performed on the inter-frame prediction error signal by orthogonal transform coding. It has a hybrid configuration that eliminates redundancy.

FIG. 4 shows the principle of the above-described motion-compensated interframe predictive orthogonal transform coding method. The motion compensation inter-frame prediction unit 41 creates a predicted value of the input video signal from the already encoded video signal stored in the frame memory 43, and predicts the difference between the predicted value and the input video signal. Output as an error signal. At this time, motion vector information or the like, which is motion information used to create a predicted value, is also output.

[0007] The prediction error encoding unit 42 encodes the prediction error signal using a technique such as orthogonal transform, and further suppresses redundancy. The encoded prediction error signal is locally decoded, stored in the frame memory 43, and used for prediction of the next image frame. The motion compensation inter-frame prediction unit 41, the prediction error encoding unit 42, the frame memory 43
In this example, the input image signal is subjected to redundancy suppression encoding processing, and these are collectively referred to as an information source encoding unit 45.

[0008] The code sequence constructing section 44 includes information such as a motion vector from the motion compensation inter-frame predicting section 41, and coding / non-coding for each unit area output from the prediction error coding section 42 as coded prediction error information. Encoding control information such as quantization discrimination, quantization width information, and orthogonal transform coefficients that have been quantized and variable-length coded are combined into one code string and output. FIG. 5A shows an example of the configuration of a code string output from the video encoding device in this manner.
For each coding unit area, coding control information, motion vector information, and orthogonal transform coefficients are output.

FIG. 6 shows a configuration of a conventional video decoding apparatus. The video decoding device decodes and outputs a video signal from a code sequence by performing an operation reverse to that of the video encoding device.

The code string decomposing unit 64 decodes the transmitted code string, discriminates coding / non-coding for each unit area as information such as motion vector, coding prediction error information, and quantization width. It is decomposed into coding control information such as information, orthogonal transform coefficients quantized and variable-length coded, and the like, and output.

The motion-compensated inter-frame prediction unit 61 calculates a predicted value of a video signal from the already decoded video signal stored in the frame memory 63 and information such as a motion vector from the code sequence decomposition unit 64. Is generated, and a video signal is restored from the prediction value and the prediction error signal from the prediction error decoding unit 62 and output.

The restored video signal is output to the outside, stored in the frame memory 43, and used for predicting the next image frame. Similar to the above-described conventional video encoding apparatus, the motion compensation inter-frame prediction unit 61, the prediction error decoding unit 62, and the frame memory 63 perform processing of decoding encoded video information and restoring a video signal. Therefore, these are collectively referred to as an information source decoding unit 65.

Now, as described above, mobile communication, etc.
When the state of the transmission path is unstable, a problem due to a transmission error occurs. As described above, in video coding, there is a problem that the effect is increased when an error occurs because information is reduced in order to suppress the redundancy included in the video signal.

As a technique for suppressing the redundancy, variable length coding is performed. This aims at minimizing the code amount required for expressing information by configuring a code table so that information having a large probability of occurrence is assigned a short codeword and information having a small probability of occurrence is assigned a long codeword. Things.

In such a variable-length code, for example, if decoding is performed sequentially from the beginning, the end of the code word can be reliably recognized, and even if information on the boundary or length of the code word is not included,
It is possible to specify the end of a codeword. Such a property is called “a code that can be uniquely decoded”.

However, in such a variable length code, once an error occurs in a part of a code string, not only is it decoded as a different code word, but also the end of the code word, that is, the boundary with the next code word. Cannot be recognized correctly, and all subsequent codewords in the code string are incorrectly recognized. This causes a phenomenon called out-of-synchronization of the variable-length code.

In video coding, since the motion-compensated inter-frame prediction is performed as described above, it is necessary to create the same prediction value on the coding side and the decoding side. However, if a transmission error occurs and erroneous information is received on the decoding side, the encoded video signal cannot be correctly restored. At this time, completely different video signals are restored between the encoding side assuming that the information has been correctly transmitted to the other party and the decoding side receiving the incorrect information, and the prediction values do not match. Is generated.

Once such inconsistency occurs, prediction from incorrect information continues to be made, and its influence spreads to subsequent image frames, causing significant image quality degradation.

In order to prevent erroneous decoding of a variable length code due to such a transmission error and further deterioration of video quality due to the transmission error, conventional video coding apparatuses take measures such as insertion of a synchronization marker code. I have.

FIG. 5B shows an example of the structure of a code string in which a synchronization marker code output from a conventional video coding apparatus is inserted. This is because the synchronization marker code is inserted at an appropriate interval in the code sequence, so that even if the variable-length codeword cannot be decoded correctly due to an error, the synchronization is recovered at the next synchronization marker code position, that is, the code is recovered. It attempts to localize the effects of errors by ensuring that the words are decoded again from the correct start position.

At this time, since the synchronization marker code is composed of any code or a unique code word that cannot be obtained from an appropriate combination thereof, independent of the process of sequentially decoding the variable length code, Detection is possible by searching for a pattern that matches the synchronization marker code in the code string.

Further, it is possible to prevent a synchronization marker code itself from being transmitted incorrectly due to a transmission error,
In order to prevent erroneous detection due to the occurrence (emulation) of the same pattern as a synchronization marker code that should not originally appear in the code string, the insertion position of the synchronization marker code word must be m bits counted from the beginning of the code string. It is necessary to make the number be an integral multiple or to make the insertion interval of the synchronization marker code be the boundary of the information closest to a predetermined data length of n bytes, or the boundary of the information that first appears when the data length is n bytes or more. Have been done. This is because, when searching for a synchronization marker code on the decoding side, a search for only a limited position or a search for only the insertion position and its surroundings assuming an insertion position causes the detection of the synchronization marker code to be overlooked. Also, it is intended to prevent erroneous detection due to emulation.

[0023]

However, in the video coding and decoding apparatus according to the conventional method, even if the influence of a transmission error is localized, the error cannot be reduced to zero and correct decoding cannot be performed. Deterioration of the video quality occurs in the portion that has not been provided, which has the problem that the subsequent video quality continues to deteriorate as a mismatch between the predicted values on the encoding side and the decoding side.

Therefore, in the present invention, in view of the above problems,
The video information, which is the result of the source coding of the video information, is decomposed once for each information type, and information having a large effect on video quality and information having a small effect are distinguished.
By inserting a boundary code at the boundary between different types of information,
By synthesizing and transmitting a code string so that classified information can be decoded independently, even if a transmission error occurs and one type of information cannot be decoded, the effect of another type is different. The above-mentioned problem is solved by preventing the spread to the information, and decoding the correctly decoded information to restore the video signal, thereby reducing the video quality deterioration due to the transmission error.

[0025]

According to the first aspect of the present invention, an information source encoding means for encoding an input video signal and outputting the encoded video signal, and encoding video information from the information source encoding means. What is claimed is: 1. A video encoding apparatus comprising a transmission code sequence generation unit that outputs a predetermined format, wherein the transmission code sequence generation unit is configured to decompose coded video information into information types; The above object is attained by providing a code string synthesizing unit that synthesizes a transmission code string by inserting a boundary code at a boundary between information types decomposed by the decomposing unit.

According to the second aspect of the present invention, the coded information decomposing unit resolves the above-mentioned problem by decomposing the orthogonal transform coefficients into low-band components and high-band components as different information types.

According to the third aspect of the present invention, the code sequence synthesizing unit inserts a boundary code at a boundary of the information type decomposed by the coded information decomposing unit, and simultaneously inserts a synchronization marker code every predetermined number of data. Is inserted to synthesize the transmission code string, thereby solving the above problem.

According to a fourth aspect of the present invention, the code string synthesizing section includes one or a plurality of coding unit areas of one or more coding unit areas so that the number of data between the synchronization marker codes becomes substantially a predetermined number of data.
Alternatively, the above problem is solved by synthesizing a plurality of information types between synchronization marker codes.

According to the fifth aspect of the present invention, a transmission code string analyzing section for decoding an input transmission code string and outputting encoded video information, and encoding video information from the transmission code string analyzing section. An information source decoding unit for decoding and restoring and outputting a video signal, wherein the transmission code sequence analysis unit converts a transmission code sequence consisting of one code sequence into different information types. A code string decomposing unit that divides the information into information types by detecting a code indicating a boundary of information, and an encoding that combines the encoded video information divided by the code sequence decomposing unit and outputs the synthesized information to an information source decoding unit The above problem is solved by providing the information output unit.

According to claim 6 of the present invention, the code string decomposing unit detects a boundary code indicating a boundary of information of different information types and a synchronization marker code inserted for each predetermined number of data. The above problem is solved by dividing data into information types.

According to a seventh aspect of the present invention, there is provided a video encoding method for encoding an input video signal and outputting the encoded video signal as a predetermined format. The above problem is solved by inserting a boundary code at the boundary between information types and synthesizing and outputting a transmission code string.

According to the eighth aspect of the present invention, the above-mentioned problem is solved by decomposing the orthogonal transform coefficient into low-frequency components and high-frequency components as different information types.

According to the ninth aspect of the present invention, by inserting a boundary code at the boundary of the decomposed information type and inserting a synchronization marker code for each predetermined number of data to synthesize a transmission code string, Solution to the Problems

According to the tenth aspect of the present invention, one or a plurality of information types of one or a plurality of coding unit areas are synchronized so that the number of data between the synchronization marker codes becomes substantially a predetermined number of data. The above problem is solved by combining between marker codes.

According to claim 11 of the present invention, there is provided a video decoding method for decoding an input transmission code string, outputting coded video information, decoding the decoded video signal, restoring a video signal, and outputting the decoded video signal. By detecting a code indicating a boundary of information of different information types, a transmission code sequence consisting of one code sequence is divided into information types, and the divided coded video information is synthesized and output, whereby Solve the problem.

According to the twelfth aspect of the present invention, data is divided into information types by detecting a boundary code indicating a boundary of information of different information types and a synchronization marker inserted for each predetermined number of data. By doing so, the above problem is solved.

[0037]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a configuration of a video encoding device according to the present invention. The video coding apparatus shown in FIG. 1 includes an information source coding unit 11 for performing redundancy suppression coding on an input video signal and outputting the video signal, and arranging coded video information from the information source coding unit 11 in a predetermined format. And a transmission code string generator 12 for outputting.

The transmission code sequence generation unit 12 divides the coded video information for each information type, and the transmission code sequence generation unit 12 combines the decomposed coded video information into one code sequence again to transmit the coded video information. And a code sequence synthesizing unit 14 for generating and outputting a sequence.

Of these, the information source encoding unit 11 is the same as the conventional video encoding method, and therefore, the description is omitted. In the video encoding apparatus according to the present invention, the transmission code sequence generation unit 12 includes an encoded information decomposition unit 13
, The encoded video information is decomposed for each information type, and the decomposed encoded video information is converted into a code string synthesizing unit 14 by a boundary code indicating a boundary between information of different types, and a synchronization marker code at an appropriate interval. This is different from the conventional method in that a transmission code string is generated by being inserted and synthesized into one code string to be output.

Hereinafter, the flow of processing in the transmission code string generation unit of the present invention will be described with reference to the flowchart of FIG. In step S1 (hereinafter S1), first, a data length counter provided for each data type is reset.

In step S2, the motion vector information (a) and the coded video information (b), which are the result of coding the input video signal, are input from the information source 12 is input.

In the processing after S3, the coded information decomposing unit 13 classifies the information for each type, and sends each of them to the code string synthesizing unit 14. The code sequence synthesizing unit 14 arranges these pieces of information into a predetermined format based on a predetermined rule, and synthesizes and outputs one code sequence.

At this time, when combining different types of information, the code string combining unit 14 inserts a boundary code at the boundary. Even when information of the same type is continuous, a synchronization marker code is inserted at a predetermined interval.

This processing is performed in steps S3 to S3 in the flowchart of FIG.
This is executed by S9. In S3, if the current position is the position where the predetermined synchronization marker code is inserted, the synchronization marker code is inserted in S4. In S8 (a) to S (d), the data length of each information is counted, and the synchronization marker code is inserted at a predetermined interval based on the count in S8 (a) to (d). . Further, the data length of the entire information is counted in S9, and the synchronization marker code is similarly inserted by this count.

In S5, it is determined whether or not the type of information has changed. If it is determined that the type of information has changed, a boundary code is inserted in S6.

FIG. 3 shows an example of a code string synthesized and output by the code string synthesizing section 14. FIG. 3A shows that the insertion interval of the synchronization marker code is a predetermined data length (n bytes).
, The coded video information of a plurality of consecutive coding unit areas is sandwiched by synchronization marker codes,
This is an example in which the inside is divided by information type with a boundary code as a boundary.

In this case, the timing when the count value of the entire data length becomes closest to the predetermined n bytes, that is, the numerical value counted in S9 is determined in S3,
4 inserts a synchronization marker code.

The data length may be a predetermined fixed value, or may be an appropriate value based on the conditions under which the encoding process is performed, such as the transmission bit rate, the frame rate of the video signal to be encoded, and the video format. May be determined.

As a feature of the present invention, a low-frequency component and a high-frequency component of the orthogonal transform coefficient encoded by the information source encoding unit 11 are distinguished as the information type. This is because most of the energy of the original video signal is concentrated in the low-frequency component of the orthogonal transform coefficients. That is, while the low-frequency component has a large effect on the image quality, The components are due to their very small effect on visual image quality.

Therefore, even if an error occurs in the high-frequency component of the orthogonal transform coefficient and the variable-length code cannot be correctly decoded, the variable-length code word is correctly again corrected from the beginning at the position of the next boundary code or synchronization marker code. Since decoding can be performed, the effect of an error can be limited to only high-frequency components. Further, even if an error occurs in the high-frequency component as described above, it is possible to make it hardly visually recognizable that the image quality is deteriorated.

When an error occurs in the low-frequency component of the orthogonal transform coefficient, the degradation of the video quality occurs in the same manner as in the conventional video encoding apparatus. The occurrence is random and therefore, FIG.
Concentrated transmission of low-frequency component information as in (a) lowers the probability that an error will occur in the low-frequency component information. That is, it is possible to reduce the probability that an error occurs in information having a large effect on video quality and the quality is degraded.

FIG. 3B shows that not only the interval between the synchronization marker codes but also the interval between the synchronization marker code and the boundary code and the interval between the boundary codes are close to a predetermined data length of n bytes. This is an example of a code string in which these codes are inserted and synthesized.

In this case, S8 in the flowchart of FIG.
In S3 or S5, it is determined whether the data length counted in (a) to (d) is close to a predetermined n bytes, and a synchronization marker code is inserted in S4 and a boundary code is inserted in S6.

In the example of FIG. 3B, not only the synchronization marker code but also the boundary code are inserted at substantially n-byte intervals, so that the boundary code can be overlooked and erroneous detection can be prevented. In addition, encoding that is more resistant to transmission errors becomes possible.

FIG. 3 (c) shows a high frequency band of orthogonal transform coefficients of a plurality of continuous coding unit areas so that the insertion interval of the synchronization marker code is closest to a predetermined data length of n bytes. The coded video information excluding the components is configured to be sandwiched between the synchronization markers. In the high-frequency portion of the orthogonal transform coefficient, a code string is configured such that a plurality of coding unit regions included between adjacent synchronization marker codes are included as one unit and information on a plurality of coding unit regions is included. .

For example, between a certain synchronization marker code and the next synchronization marker code, information of the l-th to l + k-th coding unit areas is included, and the next synchronization marker code or boundary code is included. Is assumed to include the information of the l + k + 1-th to l + j-th coding unit areas, and after the boundary code is inserted, the l-th and The code string is formed so as to include the high-frequency components of the orthogonal transform coefficients of the coding unit areas from the first to the (l + j) th coding unit area. At this time, l +
The encoding control information, the motion vector information, and the orthogonal transform coefficient (low band) up to the k-th are configured to be substantially n bytes. In other words, the synchronization marker is inserted in S4 when the data length obtained by adding S8 (a), (b), and (c) becomes substantially n bytes. Then, after the boundary code is inserted in S6, it is configured to include the high-frequency components of the orthogonal transform coefficients of the coding unit areas from l to l + j. With this configuration, FIG.
(A) Compared with the method of FIG. 3 (b), it is not necessary to insert a large number of boundary codes, so that more efficient encoding and transmission can be performed.

FIG. 2 shows the configuration of the video decoding apparatus of the present invention. The video decoding apparatus of FIG. 2 decodes a transmitted transmission code string according to an appropriate format and outputs encoded video information, and outputs a transmission code sequence analysis unit 21 and a transmission code sequence analysis unit 2.
And an information source decoding unit 22 that decodes the encoded video information from No. 1 to restore and output a video signal.

The transmission code sequence analysis unit 21 decomposes a transmission code sequence consisting of one code sequence and outputs coded video information for each information type, and collects the decomposed coded video information. And an encoded information output unit 24 for outputting the data.

Of these, the operation of the information source decoding unit 22 is the same as the conventional video decoding process. In the video decoding process of the present invention, the transmission code sequence analysis unit 21 detects the synchronization marker code inserted at a predetermined interval by the code sequence decomposition unit 23 and the boundary code indicating the boundary between different types of information. Is decomposed into a plurality of types of information, and the decomposed encoded video information is sent to the encoded information output unit 24, which is different from the related art.

Hereinafter, using the flowchart of FIG.
The flow of the process of the transmission code string analysis unit according to the present invention will be described. The processing in the transmission code string analysis unit is not much different from the processing flow in the transmission code string generation unit in FIG.

In step S11, each data length counter for counting the data length of each type of information and the entire data is reset. In step S12, the transmission code sequence is input to the transmission code sequence analysis unit 21.

In S13, it is determined from each data length counter whether or not it is the position where the synchronization marker code is inserted. S13
If it is considered that the position is the insertion position of the synchronization marker,
At 14, a synchronization marker code is searched.

Similarly, in S15, it is determined from each data length counter whether or not it is the insertion position of the boundary code. If it is determined in S15 that the position is the insertion position of the boundary code, S16
Search for the boundary code.

When the boundary code or the synchronization marker code is detected by the search, each information is read from S17 immediately after the code.
Decomposition is performed by the processes (a) to (d). At this time, the data length of this information is stored in the respective data length counters in S18 (a).
(D) is recorded. In S20, the entire information data length is also counted and recorded in the counter.

In S19 (a) and (b), each information decomposed in S17 is output to the information source decoding unit 22 as motion vector information and encoded video information, and is decoded into an output video signal.

The case of processing the code strings having the respective configurations shown in FIG. 3 will be specifically described. In the case of FIG. 3A, since the synchronization marker code is inserted so as to be closest to a predetermined data length (for example, n bytes), the code string decomposing unit 23 calculates the synchronization marker code from the data length of n bytes. Assuming a position where a code may be present (S13), the surroundings are searched in the code sequence to detect a synchronization marker code (S14). In this example, since the inside between the synchronization marker codes is collected for each information type with the boundary code as a boundary, after detecting the synchronization marker,
A boundary code between them is searched for (S16) and detected.

In the case of FIG. 3B, since the synchronization marker code or the boundary code is inserted so as to be close to a predetermined data length of n bytes, the code string decomposing unit 23 calculates the data length, That is, from the count value of the data length of each type of information, a position where a synchronization marker or a boundary code may be present is assumed (S13, S15), and the surroundings are searched in the code string (S14, S16). . Here, in the case of FIG. 3B, since either the synchronization marker code or the boundary code is detected, the detected code is identified and the information existing at the current position in the code string is identified. The type is specified and output to each classification, and each data length is counted (S17, S18).

In the case of FIG. 3C, similar to FIG.
The synchronization marker code and the boundary code are searched. Since the high-frequency component of the orthogonal transform coefficient following the boundary code includes a plurality of portions sandwiched between the synchronization marker codes that have already been detected, S18 ( In (c) and (d), these are combined and the encoded video information is output in S19 (b).

In any of the cases shown in FIGS. 3A to 3C, the synchronization marker code and the boundary code may not be transmitted correctly due to a transmission error. , The code string disassembling unit 23 determines that the code pattern is a synchronous marker code or a boundary code if a difference of several bits is not detected even if a code pattern completely matching the synchronous marker code or the boundary code cannot be detected. You may do it. With this configuration, it is possible to prevent a decoding error due to a missing code, that is, a deterioration in video quality from occurring.

[0070]

According to the first, fifth, seventh, and eleventh aspects of the present invention, in a plurality of types of encoded video information, a boundary code is inserted at a boundary between different types of information to synthesize a plurality of types of information. By generating a transmission code sequence and restoring it, even if coded video information cannot be transmitted accurately due to transmission errors or the like, only certain types of information are affected by errors, and Since the effect of an error can be localized, the effect of a transmission error can be reduced by simple means, and deterioration of video quality can be prevented.

According to the second and eighth aspects of the present invention, the low-frequency component and the high-frequency component of the orthogonal transform coefficient are processed as separate information, so that the transmission error has little effect on the video quality, especially the visual information. By increasing the probability that an error occurs only in information that is hardly perceived to deteriorate, and by reducing the probability that an error occurs in information that has a relatively large effect on video quality, it is possible to further enhance the resistance to errors.

According to the third, sixth, eighth, and twelfth aspects of the present invention, in addition to the above boundary code, a synchronization marker code is inserted so as to be substantially every predetermined number of data. In order to restore the image information based on the information, it is possible to localize the influence of the error on the image information due to the loss of synchronization of the variable-length code, and to further enhance the error resistance. In addition, since the synchronization marker code and the boundary code are inserted for each predetermined number of data, the position of the synchronization marker code and the boundary code can be predicted to some extent at the time of restoration, and restoration can be performed. Can be reduced.

According to the fourth and tenth aspects of the present invention, by inserting a boundary code so that data of a plurality of information types in a plurality of coding unit areas has a predetermined number of data, the boundary code and the The number of synchronization marker codes to be inserted can be reduced, and data redundancy due to an extremely large number of boundary codes and synchronization marker codes can be prevented.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating an embodiment of a video encoding device according to the present invention.

FIG. 2 is a block diagram illustrating an embodiment of a video decoding device according to the present invention.

FIG. 3 is a diagram illustrating an example of a code string output from a video encoding device according to the present invention.

FIG. 4 is a block diagram illustrating an example of a conventional video encoding device.

FIG. 5 is a diagram illustrating an example of a code string output from a conventional video encoding device.

FIG. 6 is a block diagram illustrating an example of a conventional video decoding device.

FIG. 7 is a flowchart illustrating an operation of a transmission code string generation unit according to the present invention.

FIG. 8 is a flowchart illustrating an operation example of a transmission code string analysis unit according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Information source encoding part 12 Transmission code string generation part 13 Encoding information decomposition part 14 Code string synthesis part 21 Transmission code string analysis part 22 Information source decoding part 23 Code sequence decomposition part 24 Encoding information output part

Claims (12)

[Claims] 1. An image source comprising: an information source encoding unit for encoding and outputting an input video signal; and a transmission code sequence generating unit for outputting encoded video information from the information source encoding unit in a predetermined format. An encoding device, wherein the transmission code sequence generating unit includes: an encoded information decomposing unit that decomposes encoded video information into information types; and a boundary code at a boundary between the information types decomposed by the encoded information decomposing unit. A video coding apparatus comprising: a code string combining unit that inserts and combines a transmission code string. 2. The video encoding apparatus according to claim 1, wherein the encoded information decomposing unit decomposes the orthogonal transform coefficient into low-frequency components and high-frequency components as different types of information. 3. The code sequence synthesizing unit inserts a boundary code at a boundary between information types decomposed by the coded information decomposing unit, and inserts a synchronization marker code for each predetermined number of data to form a transmission code sequence. The video encoding apparatus according to claim 1, wherein the video encoding is performed. 4. The code string synthesizing unit sets one or a plurality of information types of one or a plurality of coding unit areas to a synchronization marker so that the number of data between synchronization marker codes becomes substantially a predetermined number of data. 4. The video encoding device according to claim 1, wherein the video encoding is performed between codes. 5. A transmission code string analyzing section for decoding an input transmission code string and outputting encoded video information, and decoding a coded video information from the transmission code string analysis section to restore a video signal. A transmission source code stream analyzing unit, comprising: a transmission code sequence analysis unit configured to detect a transmission code sequence including one code sequence and a code indicating a boundary between information of different information types. And a coded information output unit that combines the coded video information divided by the code sequence decomposition unit and outputs the coded video information to the information source decoding unit. Video decoding device characterized by the above-mentioned. 6. The code string decomposing unit divides data into information types by detecting a boundary code indicating a boundary of information of different information types and a synchronization marker code inserted for each predetermined number of data. 6. The video decoding device according to claim 5, wherein: 7. A video encoding method for encoding an input video signal and outputting the encoded video signal as a predetermined format, wherein the encoded video information is decomposed into information types, and a boundary code is added to a boundary between the decomposed information types. A video encoding method comprising inserting and inserting a transmission code string to output. 8. The video encoding method according to claim 7, wherein the orthogonal transform coefficient is decomposed into low-frequency components and high-frequency components as different information types. 9. The transmission code sequence according to claim 7, wherein a boundary code is inserted at the boundary of the decomposed information type and a synchronization marker code is inserted every predetermined number of data to synthesize a transmission code string. The video encoding method as described in the above. 10. Synthesizing one or a plurality of information types of one or a plurality of coding unit areas between the synchronization marker codes so that the number of data between the synchronization marker codes becomes substantially a predetermined number of data. The video encoding method according to claim 7, wherein the video encoding method is characterized in that: 11. A video decoding method for decoding an input transmission code string, outputting coded video information, decoding the decoded transmission signal, and restoring and outputting a video signal, comprising: a transmission code comprising one code string. A video decoding method characterized in that a column is divided into information types by detecting a code indicating a boundary between information of different information types, and the divided coded video information is synthesized and output. 12. The data is divided into information types by detecting a boundary code indicating a boundary of information of different information types and a synchronization marker code inserted for each predetermined number of data. Item 12. The video decoding device according to Item 11.