WO2012077349A1 - Procédé de codage d'image et procédé de décodage d'image - Google Patents

Procédé de codage d'image et procédé de décodage d'image Download PDF

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Publication number
WO2012077349A1
WO2012077349A1 PCT/JP2011/006876 JP2011006876W WO2012077349A1 WO 2012077349 A1 WO2012077349 A1 WO 2012077349A1 JP 2011006876 W JP2011006876 W JP 2011006876W WO 2012077349 A1 WO2012077349 A1 WO 2012077349A1
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Prior art keywords
coefficient
quantized transform
encoding
block
encoded
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PCT/JP2011/006876
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English (en)
Japanese (ja)
Inventor
寿郎 笹井
西　孝啓
陽司 柴原
敏康 杉尾
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パナソニック株式会社
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
    • H04N19/124—Quantisation
    • H04N19/126—Details of normalisation or weighting functions, e.g. normalisation matrices or variable uniform quantisers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
    • H04N19/13—Adaptive entropy coding, e.g. adaptive variable length coding [AVLC] or context adaptive binary arithmetic coding [CABAC]

Definitions

  • the present invention relates to an image encoding method and an image decoding method.
  • it relates to a variable length coding method.
  • 3A and 3B explain a predictive coding method in this intra coding.
  • FIG. 3A is a diagram showing an encoding target block in a normal time.
  • FIG. 3A shows an encoding target block and other encoding target blocks 301, 302, 303, and 304 that are referred to by the encoding target block in a normal state (encoding the central portion of the screen). Is shown.
  • Blocks 301 to 304 are coding blocks that are already coded at the time of coding of the block to be coded in coding order (encoded from the upper left to the right). Therefore, at the time of encoding of the encoding target block, the value of the in-plane predictor included in the adjacent blocks 301 to 304 is used as a predicted value, and the obtained value of the in-plane predictor is obtained by a predetermined process.
  • the residual error of a predetermined component of the encoding target block can be encoded.
  • FIG. 3B is a diagram showing an encoding target block at the time of singularity.
  • an in-plane predictor for deriving a residual for generating a predicted value cannot be obtained.
  • Conventional methods for variable-length coding schemes for special blocks at the time of singularity blocks for which predictors cannot be obtained, blocks for which reference pixels cannot be obtained, and blocks for which reference coefficient values cannot be obtained) There are two systems, 1 and the system currently under consideration.
  • a predetermined value is used as a coefficient value corresponding to a DC component (DC component).
  • the variable length coding unit includes a coefficient value of a quantized transform value (for example, a relatively large value such as +8) obtained by quantizing the DC prediction value using the predetermined value, and is included in this special block. All quantized transform coefficients are variable-length encoded using a variable-length code table selected based on the same predetermined rule as a block that is not a special block. For example, the quantized transformation value +8 of the coefficient corresponding to the DC component and the other coefficient values +1, 0,... Are variable length using one variable length code table (referred to as a VLC table, the same applies hereinafter). Encode.
  • the inventors of the present invention have focused on the coding efficiency of special blocks for which such predictors cannot be obtained in order to further improve the coding efficiency.
  • H.C. In H.264 (conventional method 1), the quantization residual included in the DC component or the like becomes extremely large compared to other blocks, and the problem that the coding efficiency at the time of overall variable length coding is not improved is discovered. .
  • related system 2 High Efficiency Video Coding
  • related system 2 which is another system related to the present invention (Related Art)
  • reference pixels or reference
  • the DC coefficient value is replaced with “1”, and the result of scanning together with other coefficient values including this coefficient value is used. Since 1 having a small value is input as the DC coefficient value, the coding efficiency of the coefficient value itself is improved as compared with the case where another value larger than 1 (for example, 8) is used as the DC coefficient value.
  • the inventors of the present invention have a code (symbol A) of a predetermined DC value encoded using another VLC table and a quantized transform coefficient value 1 corresponding to the DC coefficient.
  • a code (code B) that is encoded by including the coefficient value including the other frequency coefficient values and two codes (code A and code B) for the same value are included in the code string and are redundant. I discovered that.
  • a moving picture encoding method converts an image signal into a frequency coefficient value in units of blocks of a predetermined size, quantizes the frequency coefficient value, and a quantized conversion coefficient. Whether or not the predetermined block is an encoding target block at a singular time when there is no predictor for encoding the predetermined block. And a predetermined number of quantization coefficients among the quantized transform coefficients included in the predetermined block when the determination result indicates that the predetermined block is an encoding target block at the time of singularity.
  • the quantized transform coefficient corresponding to the code amount DC component of the special block or the coefficient value of a predetermined number of coefficients continuous thereto is a code generated by the first encoding method. As a result, the redundancy of the entire code string can be eliminated.
  • FIG. 1 is a block diagram showing a configuration of an image coding apparatus according to an embodiment of the present invention.
  • FIG. 2 is a flowchart showing the operation of the variable length coding unit.
  • FIG. 3A is a diagram illustrating an encoding target block in a normal time.
  • FIG. 3B is a diagram illustrating an encoding target block at the time of singularity.
  • FIG. 4A is a diagram illustrating an example of the operation of the variable-length encoding unit at the time of singularity.
  • FIG. 4B is a diagram illustrating another example of the operation of the variable length coding unit at the time of singularity.
  • FIG. 4C is a diagram illustrating another example of the operation of the variable length coding unit at the time of singularity.
  • FIG. 3A is a diagram illustrating an encoding target block in a normal time.
  • FIG. 3B is a diagram illustrating an encoding target block at the time of singularity.
  • FIG. 4A is a diagram illustrating
  • FIG. 4D is a diagram illustrating another example of the operation of the variable length coding unit at the time of singularity.
  • FIG. 5A is a diagram illustrating an example of quantized transform coefficients input to the variable length coding unit.
  • FIG. 5B is a diagram illustrating a quantized transform coefficient sequence excluding the lowest frequency component.
  • FIG. 5C is a diagram illustrating a quantized transform coefficient sequence excluding a sequence of two or more consecutive coefficient values including the lowest frequency component.
  • FIG. 5D is a diagram illustrating a one-dimensional arrangement and position shift.
  • FIG. 6A is a flowchart (HEVC) of the second encoding method of the variable length encoding unit.
  • 6B is a flowchart (H.264) of the second coding method of the variable length coding unit.
  • FIG. HEVC flowchart
  • H.264 flowchart
  • FIG. 6C is a flowchart (CABAC) of the second coding method of the variable length coding unit.
  • FIG. 7 is a diagram illustrating a configuration of a variable length code table used in the first encoding method or the second encoding method.
  • FIG. 8 is a block diagram showing a configuration of the image coding apparatus according to the second embodiment.
  • FIG. 9 is an overall configuration diagram of a content supply system that implements a content distribution service.
  • FIG. 10 is an overall configuration diagram of a digital broadcasting system.
  • FIG. 11 is a block diagram illustrating a configuration example of a television.
  • FIG. 12 is a block diagram illustrating a configuration example of an information reproducing / recording unit that reads and writes information from and on a recording medium that is an optical disk.
  • FIG. 13 is a diagram illustrating a structure example of a recording medium that is an optical disk.
  • 14A is a diagram illustrating an example of a mobile phone
  • FIG. 14B is a block diagram illustrating a configuration example of the mobile phone.
  • FIG. 15 is a diagram showing a structure of multiplexed data.
  • FIG. 16 is a diagram schematically showing how each stream is multiplexed in the multiplexed data.
  • FIG. 17 is a diagram showing in more detail how the video stream is stored in the PES packet sequence.
  • FIG. 18 is a diagram showing the structure of TS packets and source packets in multiplexed data.
  • FIG. 19 is a diagram illustrating a data structure of the PMT.
  • FIG. 20 is a diagram illustrating an internal configuration of multiplexed data information.
  • FIG. 21 shows the internal structure of stream attribute information.
  • FIG. 22 is a diagram illustrating steps for identifying video data.
  • FIG. 23 is a block diagram illustrating a configuration example of an integrated circuit that implements the moving picture coding method and the moving picture decoding method according to each embodiment.
  • FIG. 24 is a diagram illustrating a configuration for switching the driving frequency.
  • FIG. 25 is a diagram illustrating steps for identifying video data and switching between driving frequencies.
  • FIG. 26 is a diagram illustrating an example of a look-up table in which video data standards are associated with drive frequencies.
  • 27A is a diagram illustrating an example of a configuration for sharing a module of a signal processing unit
  • FIG. 27B is a diagram illustrating another example of a configuration of sharing a module of a signal processing unit.
  • FIG. 1 is a diagram for explaining an encoding apparatus according to this embodiment of the present invention.
  • the image coding apparatus derives a transform unit, a quantization unit, a coding control unit, a variable length coding unit 110, and a prediction residual (a pixel value difference between a reference image and a coding target image).
  • a prediction residual a pixel value difference between a reference image and a coding target image.
  • the encoding control unit determines whether a picture to be encoded (or a predetermined unit such as a slice or a macroblock) is a picture to be subjected to intraframe prediction encoding, or is subjected to interframe prediction encoding. It is determined whether or not the picture is a unique picture. The determined result is supplied to the variable length encoding unit 110 as an encoding control signal.
  • the variable length encoding unit 110 encodes the quantized transform coefficient, which is an output signal from the quantization unit, based on the encoding control signal by the variable length encoding method of the present invention, and outputs a code string.
  • FIG. 2 is a flowchart showing processing in the variable length coding unit 110.
  • the quantization unit inputs an encoding control signal, which is a control signal corresponding to the encoding target signal, to the variable length encoding unit (step S201).
  • the singular time includes a case where at least a predictor is not obtained (in a case of an in-plane predictive coding mode and surrounding coded pixels cannot be referred to).
  • the input quantized transform coefficient is encoded by a normal encoding method and the process ends.
  • the predetermined encoding method is the encoding method in the normal time described above.
  • step S202 If the determination result indicates that the time is unusual (YES in step S202), the following processing is further performed.
  • the predetermined number of low-frequency component quantization coefficients including the quantization transform coefficient corresponding to the DC component described above are encoded by the first encoding method (step S203). This point will be described later with reference to FIGS. 4A to 4D.
  • step S204 the position of the quantized transform coefficient is shifted, and a predetermined number of quantized transform coefficients are deleted. This point will be described later with reference to FIGS. 5A to 5D.
  • step S205 the remaining quantized transform coefficients after deletion are encoded by the second encoding method.
  • the second encoding method will be described in detail with reference to FIGS. 6A to 6C.
  • 4A to 4D are diagrams exemplifying operations in S202 to S203 of the variable length coding unit 110 when it is shown in S202 that the determination result indicates that the time is unique.
  • FIGS. 4A, 4B, 4C, and 4D includes a low frequency to a high frequency that includes a quantized transform coefficient corresponding to a DC coefficient among quantized transform coefficients included in a block to be encoded.
  • FIG. 4A is a flowchart when the predetermined number of low-frequency quantized transform coefficients are encoded using a VLC table (Variable Length Code) which is a predetermined variable length code table. If it is determined that it is a singular time (the result of S202 in FIG. 2 is YES), a VLC table for singular time is set (S401a), and the low-frequency quantization transform is performed using this set VLC table for singular time. Coefficients are encoded and output (S402a).
  • VLC table Very Length Code
  • FIG. 4B is a flowchart in the case of using a binary arithmetic coder CABAC (Context Adaptive Binary Arithmetic Code).
  • CABAC Context Adaptive Binary Arithmetic Code
  • Modification 3 and Modification 4C and 4D encode the low frequency quantized transform coefficient using the VLC table (or context model) for singular time (S402c, S403c) and output it. It is determined whether or not the encoded low frequency quantized transform coefficient exceeds a predetermined threshold (S404c). If the threshold is exceeded (YES in S404c), the next quantized transform coefficient is further encoded from the low frequency side using the singular VLC table (or context model) (S401c to 403c). . The process ends (shifts to normal encoding) when the value falls below the threshold value (NO in 404c).
  • the threshold value may be determined in advance as the same value for encoding and decoding, or may be transmitted from the encoding side to the decoding side as header information of the bitstream.
  • FIG. 5A shows an example of a quantized transform coefficient input to the variable length coding unit in FIG.
  • the coefficient C00 at the upper left is a coefficient value of the lowest frequency component such as a DC coefficient (direct current component). From C00 to C33, the low-frequency component values and the high-frequency components are arranged in the order of the respective matrix directions.
  • variable length coding unit 110 scans the coefficients into a one-dimensional coefficient sequence. For example, scanning is performed in a zigzag manner from a coefficient corresponding to a low frequency to a coefficient corresponding to a high frequency (note that the arrows in the figure indicate the reverse order of scanning).
  • the coefficient sequence is shifted in the direction in which a predetermined number of coefficients are deleted from the coefficient value of the quantization coefficient corresponding to the low frequency component.
  • the position of the coefficient that becomes non-zero is finally coded from the front (low frequency side) to the rear (high frequency side) of the one-dimensional coefficient sequence. Therefore, the position is shifted in such a way that the quantized coefficient positions reduced in advance are packed.
  • the generated columns are set to a predetermined number. Coefficients and coefficients are shifted to the left.
  • FIG. 5B is a diagram illustrating the remaining quantized transform coefficient sequences in which only the component value (DC component) C00 having the lowest frequency is removed from the coefficient value sequence by the variable length coding unit.
  • FIG. 5C shows the remaining quantized transform coefficients excluding a predetermined number of consecutive coefficient value sequences (C00, C01, C11) including the lowest frequency component (DC component) C00 by the variable length coding unit. It is a figure which shows a column.
  • a coefficient sequence is generated by deleting the quantization coefficient corresponding to at least the DC component among the quantization coefficients.
  • FIG. 5D is a diagram for explaining the deletion of a predetermined number of coefficients by a one-dimensional array generated by scanning and a shift.
  • the coefficient When encoding a quantized transform coefficient, the coefficient is scanned one-dimensionally and encoded as a one-dimensional sequence. For example, as shown in FIGS. 5B and 5C, the scan order is a zigzag order from a low frequency to a high frequency. After the coefficients are scanned one-dimensionally to form a one-dimensional coefficient string, the quantization coefficients corresponding to at least the DC component are reduced.
  • this one-dimensional coefficient sequence is shown in the upper part of FIG. 5D. For example, when there are three consecutive coefficients that exceed the predetermined threshold shown in FIGS. 4C and 4D from the coefficient corresponding to the DC component, the coefficient is shifted three times to the left to reduce the three coefficients (both the position shift of C11). Call).
  • variable length encoding unit 110 scans the quantized transform coefficients included in the input block in a predetermined scan order and stores them in a one-dimensional array, and then determines a predetermined number of coefficients from the coefficients corresponding to the low frequency components. Reduce consecutive coefficients. This is because the same scan order is applied for an abnormal time and a normal time.
  • a predetermined number of continuous coefficients can be easily deleted (or extracted) from the coefficients corresponding to the DC component, and the remaining quantized transform coefficients can be easily obtained. It becomes possible to apply the same encoding method (second encoding method) as the time.
  • FIGS. 6A, 6B, and 6C are diagrams for explaining an example of the step of S205 in FIG. 2 (“encoding of remaining quantized transform coefficients”) performed by the variable-length encoding unit 110 in FIG. .
  • any one of the processes in FIGS. 6A, 6B, and 6C is performed on the remaining quantized transform coefficient sequences.
  • FIG. 6A is a diagram illustrating an encoding method when HEVC (VLC) is used as step S205 (second encoding method) in FIG. 2. This will be described in the order of steps.
  • VLC HEVC
  • the scan order is acquired (S6001).
  • the scanning order may be determined from the low range to the high range or from the high range to the low range.
  • LastLevel is smaller than 2 (LastLevel ⁇ 2) (S6005).
  • LastPos is set to the variable x (S6007)
  • the code y corresponding to the variable x is encoded using the VLC table (S6009)
  • the SignFlag is encoded (S6011). ).
  • the continuous value (ZeroRun) of 0, the absolute value of the coefficient value (Level), and the sign of the coefficient (SignFlag) are acquired from the last direction (from the high range to the low range) (S6021).
  • the value of LastPos (that is, the position that finally becomes a coefficient other than 0) is a value that is smaller by the number of shifts. Furthermore, the value of (2) TotalCoeff is also smaller by the number of shifts.
  • the code y or y1 corresponding to the value x is set so that a small code string is generated according to the occurrence probability. In many cases, the smaller the value is, the higher the probability of occurrence is. When the value x is small, the code y corresponding to the short code string is prepared.
  • the number of input coefficients is reduced by a predetermined number, so that the number of loop executions is reduced by a predetermined number.
  • FIG. 6B shows a second encoding method for encoding the coefficient after the position shift.
  • 2 is a diagram illustrating a case where a H.264 CAVLC scheme is used.
  • steps will be described in order.
  • the number of zero coefficients on the low band side is encoded from the non-zero coefficient on the highest band (S6013b).
  • the run numbers (continuous numbers) of non-zero coefficients that are not zero values are obtained and encoded.
  • the number of non-zero coefficients or the number of all coefficients becomes a value that is smaller by the number of position shifts (or the number of predetermined number of coefficients to be deleted).
  • the number of coefficients is reduced by at least one, at least the number of executions can be reduced by one.
  • the number of consecutive nonzero coefficients is reduced by the number of deleted nonzero coefficients, so the value of the number of runs is reduced.
  • the effect of the present invention is exhibited in the encoding using a variable length code table in which a smaller code string is prepared as the value is smaller, or the code in which the probability of occurrence increases as the value is smaller along with the VLC table. Is done.
  • FIG. 6C shows an example of using CABAC instead of VLC as step S205 (second encoding method) in FIG. This will be explained in order.
  • a loop for the coefficient corresponding to the non-zero coefficient is executed. Specifically, it is determined whether or not the input coefficient is non-zero, and Significant_coeff_flag, which is a flag indicating whether or not it is non-zero, is obtained and encoded (S6001c).
  • Last_significant_coeff_flag 1 is encoded (S6007c), and the absolute values and signs (positive / negative) of all non-zero coefficients are encoded.
  • Last_significant_coef_flag 0 is encoded (S6011b), and it is determined whether the new coefficient is non-zero (S6001c).
  • the number of input coefficient sequences is reduced by the number of shifts (the number of deleted predetermined coefficients)
  • the number of loops can be reduced.
  • the encoding control unit is used to determine whether or not it is a singular time. However, if the determination result of whether or not the variable length encoding unit 110 is singular is obtained, Not limited to examples.
  • variable length encoding unit 110 it may be another unit in the encoding device, or the variable length encoding unit 110 itself may make this determination from a predetermined transform quantization coefficient.
  • variable length coding unit 110 may be included in the variable length coding unit 110.
  • the predetermined block is a block that is intra-coded and is the leftmost and uppermost block, but the in-plane predictor at a predetermined position at the slice boundary. It may be a case where the value of cannot be obtained.
  • whether or not a predictor exists for a predetermined encoding target block is determined by the encoding and decoding order of the block. For example, when encoding and decoding from the lower / right block to the left / upper block, the pixel values included in the positions of the lower / right blocks are the predictors as viewed from the block to be encoded. Become. Thus, the presence / absence of a predictor is determined based on the order of encoding of surrounding blocks (when determining the presence / absence of a predictor).
  • variable length coding unit 110 applies the first coding method and the second coding method.
  • a code indicating a position for distinguishing a position may be added to the output code string.
  • the value may be directly encoded into a code string described in any one of the tables, or the value is converted into a code associated with a short code string according to the frequency of occurrence.
  • the converted code may be converted into a code string using this table and output.
  • FIG. 8 shows a decoding apparatus for decoding a code string encoded by the encoding apparatus of the present invention.
  • the decoding apparatus includes a variable length decoding unit 801, an inverse quantization unit, an inverse transform unit, a decoding control unit, and a configuration (other processing unit) for deriving and adding a reference image and a predicted image. Including.
  • the variable length decoding unit uses the first code based on the signal extracted by the decoding control unit (whether the block corresponds to the time of abnormality and the signal for identifying the predetermined number n).
  • a predetermined number n of quantized transform coefficients (C00, C01, C10, etc.) encoded using the encoding method are decoded using the first decoding method and encoded using the second encoding method.
  • the remaining quantized transform coefficients excluding the predetermined number n of quantized transform coefficients are decoded using the second decoding method.
  • the storage medium may be any medium that can record a program, such as a magnetic disk, an optical disk, a magneto-optical disk, an IC card, and a semiconductor memory.
  • FIG. 9 is a diagram showing an overall configuration of a content supply system ex100 that realizes a content distribution service.
  • a communication service providing area is divided into desired sizes, and base stations ex106, ex107, ex108, ex109, and ex110, which are fixed wireless stations, are installed in each cell.
  • This content supply system ex100 includes a computer ex111, a PDA (Personal Digital Assistant) ex112, a camera ex113, a mobile phone ex114, a game machine ex115 via the Internet ex101, the Internet service provider ex102, the telephone network ex104, and the base stations ex106 to ex110. Etc. are connected.
  • PDA Personal Digital Assistant
  • each device may be directly connected to the telephone network ex104 without going from the base station ex106, which is a fixed wireless station, to ex110.
  • the devices may be directly connected to each other via short-range wireless or the like.
  • the camera ex113 is a device that can shoot moving images such as a digital video camera
  • the camera ex116 is a device that can shoot still images and movies such as a digital camera.
  • the mobile phone ex114 is a GSM (registered trademark) (Global System for Mobile Communications) system, a CDMA (Code Division Multiple Access) system, a W-CDMA (Wideband-Code Division Multiple Access) system, or an LTE (Long Term Evolution). It is possible to use any of the above-mentioned systems, HSPA (High Speed Packet Access) mobile phone, PHS (Personal Handyphone System), or the like.
  • the camera ex113 and the like are connected to the streaming server ex103 through the base station ex109 and the telephone network ex104, thereby enabling live distribution and the like.
  • live distribution the content (for example, music live video) captured by the user using the camera ex113 is encoded as described in the above embodiments, and transmitted to the streaming server ex103.
  • the streaming server ex103 stream-distributes the content data transmitted to the requested client. Examples of the client include a computer ex111, a PDA ex112, a camera ex113, a mobile phone ex114, and a game machine ex115 that can decode the encoded data. Each device that receives the distributed data decodes the received data and reproduces it.
  • the captured data may be encoded by the camera ex113, the streaming server ex103 that performs data transmission processing, or may be shared with each other.
  • the decryption processing of the distributed data may be performed by the client, the streaming server ex103, or may be performed in common with each other.
  • still images and / or moving image data captured by the camera ex116 may be transmitted to the streaming server ex103 via the computer ex111.
  • the encoding process in this case may be performed by any of the camera ex116, the computer ex111, and the streaming server ex103, or may be performed in a shared manner.
  • these encoding / decoding processes are generally performed in the computer ex111 and the LSI ex500 included in each device.
  • the LSI ex500 may be configured as a single chip or a plurality of chips.
  • moving image encoding / decoding software is incorporated into some recording medium (CD-ROM, flexible disk, hard disk, etc.) that can be read by the computer ex111, etc., and encoding / decoding processing is performed using the software. May be.
  • moving image data acquired by the camera may be transmitted.
  • the moving image data at this time is data encoded by the LSI ex500 included in the mobile phone ex114.
  • the streaming server ex103 may be a plurality of servers or a plurality of computers, and may process, record, and distribute data in a distributed manner.
  • the encoded data can be received and reproduced by the client.
  • the information transmitted by the user can be received, decrypted and reproduced by the client in real time, and personal broadcasting can be realized even for a user who does not have special rights or facilities.
  • the digital broadcast system ex200 incorporates at least one of the video encoding device and the video decoding device of each of the above embodiments. be able to.
  • the broadcast station ex201 multiplexed data obtained by multiplexing music data and the like on video data is transmitted to a communication or satellite ex202 via radio waves.
  • This video data is data encoded by the moving image encoding method described in the above embodiments.
  • the broadcasting satellite ex202 transmits a radio wave for broadcasting, and this radio wave is received by a home antenna ex204 capable of receiving satellite broadcasting.
  • the received multiplexed data is decoded and reproduced by a device such as the television (receiver) ex300 or the set top box (STB) ex217.
  • a reader / recorder ex218 that reads and decodes multiplexed data recorded on a recording medium ex215 such as a DVD or a BD, or encodes a video signal on the recording medium ex215 and, in some cases, multiplexes and writes it with a music signal. It is possible to mount the moving picture decoding apparatus or moving picture encoding apparatus described in the above embodiments. In this case, the reproduced video signal is displayed on the monitor ex219, and the video signal can be reproduced in another device or system using the recording medium ex215 on which the multiplexed data is recorded.
  • a moving picture decoding apparatus may be mounted in a set-top box ex217 connected to a cable ex203 for cable television or an antenna ex204 for satellite / terrestrial broadcasting and displayed on the monitor ex219 of the television.
  • the moving picture decoding apparatus may be incorporated in the television instead of the set top box.
  • FIG. 11 is a diagram illustrating a television (receiver) ex300 that uses the video decoding method and the video encoding method described in each of the above embodiments.
  • the television ex300 obtains or outputs multiplexed data in which audio data is multiplexed with video data via the antenna ex204 or the cable ex203 that receives the broadcast, and demodulates the received multiplexed data.
  • the modulation / demodulation unit ex302 that modulates multiplexed data to be transmitted to the outside, and the demodulated multiplexed data is separated into video data and audio data, or the video data and audio data encoded by the signal processing unit ex306 Is provided with a multiplexing / demultiplexing unit ex303.
  • the television ex300 decodes the audio data and the video data, or encodes each information, the audio signal processing unit ex304, the signal processing unit ex306 including the video signal processing unit ex305, and the decoded audio signal.
  • the television ex300 includes an interface unit ex317 including an operation input unit ex312 that receives an input of a user operation.
  • the television ex300 includes a control unit ex310 that performs overall control of each unit, and a power supply circuit unit ex311 that supplies power to each unit.
  • the interface unit ex317 includes a bridge unit ex313 connected to an external device such as a reader / recorder ex218, a recording unit ex216 such as an SD card, and an external recording unit such as a hard disk.
  • a driver ex315 for connecting to a medium, a modem ex316 for connecting to a telephone network, and the like may be included.
  • the recording medium ex216 is capable of electrically recording information by using a nonvolatile / volatile semiconductor memory element to be stored.
  • Each part of the television ex300 is connected to each other via a synchronous bus.
  • the television ex300 receives a user operation from the remote controller ex220 or the like, and demultiplexes the multiplexed data demodulated by the modulation / demodulation unit ex302 by the multiplexing / demultiplexing unit ex303 based on the control of the control unit ex310 having a CPU or the like. Furthermore, in the television ex300, the separated audio data is decoded by the audio signal processing unit ex304, and the separated video data is decoded by the video signal processing unit ex305 using the decoding method described in each of the above embodiments.
  • the decoded audio signal and video signal are output from the output unit ex309 to the outside. At the time of output, these signals may be temporarily stored in the buffers ex318, ex319, etc. so that the audio signal and the video signal are reproduced in synchronization. Also, the television ex300 may read multiplexed data from recording media ex215 and ex216 such as a magnetic / optical disk and an SD card, not from broadcasting. Next, a configuration in which the television ex300 encodes an audio signal or a video signal and transmits the signal to the outside or to a recording medium will be described.
  • the television ex300 receives a user operation from the remote controller ex220 and the like, encodes an audio signal with the audio signal processing unit ex304, and converts the video signal with the video signal processing unit ex305 based on the control of the control unit ex310. Encoding is performed using the encoding method described in (1).
  • the encoded audio signal and video signal are multiplexed by the multiplexing / demultiplexing unit ex303 and output to the outside. When multiplexing, these signals may be temporarily stored in the buffers ex320, ex321, etc. so that the audio signal and the video signal are synchronized.
  • a plurality of buffers ex318, ex319, ex320, and ex321 may be provided as illustrated, or one or more buffers may be shared. Further, in addition to the illustrated example, data may be stored in the buffer as a buffer material that prevents system overflow and underflow, for example, between the modulation / demodulation unit ex302 and the multiplexing / demultiplexing unit ex303.
  • the television ex300 has a configuration for receiving AV input of a microphone and a camera, and performs encoding processing on the data acquired from them. Also good.
  • the television ex300 has been described as a configuration capable of the above-described encoding processing, multiplexing, and external output, but these processing cannot be performed, and only the above-described reception, decoding processing, and external output are possible. It may be a configuration.
  • the decoding process or the encoding process may be performed by either the television ex300 or the reader / recorder ex218,
  • the reader / recorder ex218 may share with each other.
  • FIG. 12 shows a configuration of the information reproducing / recording unit ex400 when data is read from or written to the optical disk.
  • the information reproducing / recording unit ex400 includes elements ex401, ex402, ex403, ex404, ex405, ex406, and ex407 described below.
  • the optical head ex401 irradiates a laser spot on the recording surface of the recording medium ex215 that is an optical disk to write information, and detects reflected light from the recording surface of the recording medium ex215 to read the information.
  • the modulation recording unit ex402 electrically drives a semiconductor laser built in the optical head ex401 and modulates the laser beam according to the recording data.
  • the reproduction demodulator ex403 amplifies the reproduction signal obtained by electrically detecting the reflected light from the recording surface by the photodetector built in the optical head ex401, separates and demodulates the signal component recorded on the recording medium ex215, and is necessary To play back information.
  • the buffer ex404 temporarily holds information to be recorded on the recording medium ex215 and information reproduced from the recording medium ex215.
  • the disk motor ex405 rotates the recording medium ex215.
  • the servo controller ex406 moves the optical head ex401 to a predetermined information track while controlling the rotational drive of the disk motor ex405, and performs a laser spot tracking process.
  • the system control unit ex407 controls the entire information reproduction / recording unit ex400.
  • the system control unit ex407 uses various kinds of information held in the buffer ex404, and generates and adds new information as necessary, and the modulation recording unit ex402, the reproduction demodulation unit This is realized by recording / reproducing information through the optical head ex401 while operating the ex403 and the servo control unit ex406 in a coordinated manner.
  • the system control unit ex407 is composed of, for example, a microprocessor, and executes these processes by executing a read / write program.
  • the optical head ex401 has been described as irradiating a laser spot.
  • a configuration in which higher-density recording is performed using near-field light may be used.
  • FIG. 13 shows a schematic diagram of a recording medium ex215 that is an optical disk.
  • Guide grooves grooves
  • address information indicating the absolute position on the disc is recorded in advance on the information track ex230 by changing the shape of the groove.
  • This address information includes information for specifying the position of the recording block ex231 that is a unit for recording data, and the recording block is specified by reproducing the information track ex230 and reading the address information in a recording or reproducing apparatus.
  • the recording medium ex215 includes a data recording area ex233, an inner peripheral area ex232, and an outer peripheral area ex234.
  • the area used for recording user data is the data recording area ex233, and the inner circumference area ex232 and the outer circumference area ex234 arranged on the inner or outer circumference of the data recording area ex233 are used for specific purposes other than user data recording. Used.
  • the information reproducing / recording unit ex400 reads / writes encoded audio data, video data, or multiplexed data obtained by multiplexing these data with respect to the data recording area ex233 of the recording medium ex215.
  • an optical disk such as a single-layer DVD or BD has been described as an example.
  • the present invention is not limited to these, and an optical disk having a multilayer structure and capable of recording other than the surface may be used.
  • an optical disc with a multi-dimensional recording / reproducing structure such as recording information using light of different wavelengths in the same place on the disc, or recording different layers of information from various angles. It may be.
  • the car ex210 having the antenna ex205 can receive data from the satellite ex202 and the like, and the moving image can be reproduced on a display device such as the car navigation ex211 that the car ex210 has.
  • the configuration of the car navigation ex211 may be, for example, a configuration in which a GPS receiving unit is added in the configuration illustrated in FIG. 11, and the same may be considered for the computer ex111, the mobile phone ex114, and the like.
  • FIG. 14 (a) is a diagram showing a mobile phone ex114 using the moving picture decoding method and the moving picture encoding method described in the above embodiment.
  • the mobile phone ex114 includes an antenna ex350 for transmitting and receiving radio waves to and from the base station ex110, a camera unit ex365 capable of capturing video and still images, a video captured by the camera unit ex365, a video received by the antenna ex350, and the like Is provided with a display unit ex358 such as a liquid crystal display for displaying the decrypted data.
  • the mobile phone ex114 further includes a main body unit having an operation key unit ex366, an audio output unit ex357 such as a speaker for outputting audio, an audio input unit ex356 such as a microphone for inputting audio, a captured video,
  • an audio input unit ex356 such as a microphone for inputting audio
  • a captured video In the memory unit ex367 for storing encoded data or decoded data such as still images, recorded audio, received video, still images, mails, or the like, or an interface unit with a recording medium for storing data
  • a slot ex364 is provided.
  • the mobile phone ex114 has a power supply circuit part ex361, an operation input control part ex362, and a video signal processing part ex355 with respect to a main control part ex360 that comprehensively controls each part of the main body including the display part ex358 and the operation key part ex366.
  • a camera interface unit ex363, an LCD (Liquid Crystal Display) control unit ex359, a modulation / demodulation unit ex352, a multiplexing / demultiplexing unit ex353, an audio signal processing unit ex354, a slot unit ex364, and a memory unit ex367 are connected to each other via a bus ex370. ing.
  • the power supply circuit unit ex361 starts up the mobile phone ex114 in an operable state by supplying power from the battery pack to each unit.
  • the cellular phone ex114 converts the audio signal collected by the audio input unit ex356 in the voice call mode into a digital audio signal by the audio signal processing unit ex354 based on the control of the main control unit ex360 having a CPU, a ROM, a RAM, and the like. Then, this is subjected to spectrum spread processing by the modulation / demodulation unit ex352, digital-analog conversion processing and frequency conversion processing are performed by the transmission / reception unit ex351, and then transmitted via the antenna ex350.
  • the mobile phone ex114 also amplifies the received data received via the antenna ex350 in the voice call mode, performs frequency conversion processing and analog-digital conversion processing, performs spectrum despreading processing by the modulation / demodulation unit ex352, and performs voice signal processing unit After being converted into an analog audio signal by ex354, this is output from the audio output unit ex356.
  • the text data of the e-mail input by operating the operation key unit ex366 of the main unit is sent to the main control unit ex360 via the operation input control unit ex362.
  • the main control unit ex360 performs spread spectrum processing on the text data in the modulation / demodulation unit ex352, performs digital analog conversion processing and frequency conversion processing in the transmission / reception unit ex351, and then transmits the text data to the base station ex110 via the antenna ex350.
  • almost the reverse process is performed on the received data and output to the display unit ex358.
  • the video signal processing unit ex355 compresses the video signal supplied from the camera unit ex365 by the moving image encoding method described in the above embodiments.
  • the encoded video data is sent to the multiplexing / separating unit ex353.
  • the audio signal processing unit ex354 encodes the audio signal picked up by the audio signal input unit ex356 while the camera unit ex365 images a video, a still image, and the like, and the encoded audio data is sent to the multiplexing / separating unit ex353. Send it out.
  • the multiplexing / demultiplexing unit ex353 multiplexes the encoded video data supplied from the video signal processing unit ex355 and the encoded audio data supplied from the audio signal processing unit ex354 by a predetermined method, and is obtained as a result.
  • the multiplexed data is subjected to spread spectrum processing by the modulation / demodulation circuit unit ex352, subjected to digital analog conversion processing and frequency conversion processing by the transmission / reception unit ex351, and then transmitted via the antenna ex350.
  • the multiplexing / separating unit ex353 separates the multiplexed data into a video data bit stream and an audio data bit stream, and performs video signal processing on the video data encoded via the synchronization bus ex370.
  • the encoded audio data is supplied to the audio signal processing unit ex354 while being supplied to the unit ex355.
  • the video signal processing unit ex355 decodes the video signal by decoding using the video decoding method corresponding to the video encoding method described in each of the above embodiments, and the display unit ex358 via the LCD control unit ex359. From, for example, video and still images included in a moving image file linked to a home page are displayed.
  • the audio signal processing unit ex354 decodes the audio signal, and the audio is output from the audio output unit ex357.
  • the terminal such as the mobile phone ex114 is referred to as a transmission terminal having only an encoder and a receiving terminal having only a decoder.
  • a transmission terminal having only an encoder
  • a receiving terminal having only a decoder.
  • multiplexed data in which music data is multiplexed with video data is received and transmitted.
  • character data related to video is multiplexed. It may be converted data, or may be video data itself instead of multiplexed data.
  • the moving picture encoding method or the moving picture decoding method shown in each of the above embodiments can be used in any of the above-described devices / systems. The described effect can be obtained.
  • Embodiment 4 The moving picture coding method or apparatus shown in the above embodiments and the moving picture coding method or apparatus compliant with different standards such as MPEG-2, MPEG4-AVC, and VC-1 are appropriately switched as necessary. Thus, it is also possible to generate video data.
  • multiplexed data obtained by multiplexing audio data or the like with video data is configured to include identification information indicating which standard the video data conforms to.
  • identification information indicating which standard the video data conforms to.
  • FIG. 15 is a diagram showing a structure of multiplexed data.
  • the multiplexed data is obtained by multiplexing one or more of a video stream, an audio stream, a presentation graphics stream (PG), and an interactive graphics stream.
  • the video stream indicates the main video and sub-video of the movie
  • the audio stream (IG) indicates the main audio portion of the movie and the sub-audio mixed with the main audio
  • the presentation graphics stream indicates the subtitles of the movie.
  • the main video indicates a normal video displayed on the screen
  • the sub-video is a video displayed on a small screen in the main video.
  • the interactive graphics stream indicates an interactive screen created by arranging GUI components on the screen.
  • the video stream is encoded by the moving image encoding method or apparatus shown in the above embodiments, or the moving image encoding method or apparatus conforming to the conventional standards such as MPEG-2, MPEG4-AVC, and VC-1. ing.
  • the audio stream is encoded by a method such as Dolby AC-3, Dolby Digital Plus, MLP, DTS, DTS-HD, or linear PCM.
  • Each stream included in the multiplexed data is identified by PID. For example, 0x1011 for video streams used for movie images, 0x1100 to 0x111F for audio streams, 0x1200 to 0x121F for presentation graphics, 0x1400 to 0x141F for interactive graphics streams, 0x1B00 to 0x1B1F are assigned to video streams used for sub-pictures, and 0x1A00 to 0x1A1F are assigned to audio streams used for sub-audio mixed with the main audio.
  • FIG. 16 is a diagram schematically showing how multiplexed data is multiplexed.
  • a video stream ex235 composed of a plurality of video frames and an audio stream ex238 composed of a plurality of audio frames are converted into PES packet sequences ex236 and ex239, respectively, and converted into TS packets ex237 and ex240.
  • the data of the presentation graphics stream ex241 and interactive graphics ex244 are converted into PES packet sequences ex242 and ex245, respectively, and further converted into TS packets ex243 and ex246.
  • the multiplexed data ex247 is configured by multiplexing these TS packets into one stream.
  • FIG. 17 shows in more detail how the video stream is stored in the PES packet sequence.
  • the first row in FIG. 17 shows a video frame sequence of the video stream.
  • the second level shows a PES packet sequence.
  • a plurality of Video Presentation Units in the video stream are divided into pictures and stored in the payload of the PES packet.
  • Each PES packet has a PES header, and a PTS (Presentation Time-Stamp) that is a display time of a picture and a DTS (Decoding Time-Stamp) that is a decoding time of a picture are stored in the PES header.
  • PTS Presentation Time-Stamp
  • DTS Decoding Time-Stamp
  • FIG. 18 shows the format of TS packets that are finally written in the multiplexed data.
  • the TS packet is a 188-byte fixed-length packet composed of a 4-byte TS header having information such as a PID for identifying a stream and a 184-byte TS payload for storing data.
  • the PES packet is divided and stored in the TS payload.
  • a 4-byte TP_Extra_Header is added to a TS packet, forms a 192-byte source packet, and is written in multiplexed data.
  • TP_Extra_Header information such as ATS (Arrival_Time_Stamp) is described.
  • ATS indicates the transfer start time of the TS packet to the PID filter of the decoder.
  • Source packets are arranged in the multiplexed data as shown in the lower part of FIG. 18, and the number incremented from the head of the multiplexed data is called SPN (source packet number).
  • TS packets included in the multiplexed data include PAT (Program Association Table), PMT (Program Map Table), PCR (Program Clock Reference), and the like in addition to each stream such as video / audio / caption.
  • PAT indicates what the PID of the PMT used in the multiplexed data is, and the PID of the PAT itself is registered as 0.
  • the PMT has the PID of each stream such as video / audio / subtitles included in the multiplexed data and the attribute information of the stream corresponding to each PID, and has various descriptors related to the multiplexed data.
  • the descriptor includes copy control information for instructing permission / non-permission of copying of multiplexed data.
  • the PCR corresponds to the ATS in which the PCR packet is transferred to the decoder. Contains STC time information.
  • FIG. 19 is a diagram for explaining the data structure of the PMT in detail.
  • a PMT header describing the length of data included in the PMT is arranged at the head of the PMT.
  • a plurality of descriptors related to multiplexed data are arranged.
  • the copy control information and the like are described as descriptors.
  • a plurality of pieces of stream information regarding each stream included in the multiplexed data are arranged.
  • the stream information includes a stream descriptor in which a stream type, a stream PID, and stream attribute information (frame rate, aspect ratio, etc.) are described to identify a compression codec of the stream.
  • the multiplexed data is recorded together with the multiplexed data information file.
  • the multiplexed data information file is management information of multiplexed data, has a one-to-one correspondence with the multiplexed data, and includes multiplexed data information, stream attribute information, and an entry map.
  • the multiplexed data information includes a system rate, a reproduction start time, and a reproduction end time.
  • the system rate indicates a maximum transfer rate of multiplexed data to a PID filter of a system target decoder described later.
  • the ATS interval included in the multiplexed data is set to be equal to or less than the system rate.
  • the playback start time is the PTS of the first video frame of the multiplexed data
  • the playback end time is set by adding the playback interval for one frame to the PTS of the video frame at the end of the multiplexed data.
  • the attribute information for each stream included in the multiplexed data is registered for each PID.
  • the attribute information has different information for each video stream, audio stream, presentation graphics stream, and interactive graphics stream.
  • the video stream attribute information includes the compression codec used to compress the video stream, the resolution of the individual picture data constituting the video stream, the aspect ratio, and the frame rate. It has information such as how much it is.
  • the audio stream attribute information includes the compression codec used to compress the audio stream, the number of channels included in the audio stream, the language supported, and the sampling frequency. With information. These pieces of information are used for initialization of the decoder before the player reproduces it.
  • the stream type included in the PMT is used.
  • video stream attribute information included in the multiplexed data information is used.
  • the video encoding shown in each of the above embodiments for the stream type or video stream attribute information included in the PMT.
  • FIG. 22 shows steps of the moving picture decoding method according to the present embodiment.
  • step exS100 the stream type included in the PMT or the video stream attribute information included in the multiplexed data information is acquired from the multiplexed data.
  • step exS101 it is determined whether or not the stream type or the video stream attribute information indicates multiplexed data generated by the moving picture encoding method or apparatus described in the above embodiments. To do.
  • step exS102 the above embodiments are performed. Decoding is performed by the moving picture decoding method shown in the form.
  • the conventional information Decoding is performed by a moving image decoding method compliant with the standard.
  • FIG. 23 shows a configuration of an LSI ex500 that is made into one chip.
  • the LSI ex500 includes elements ex501, ex502, ex503, ex504, ex505, ex506, ex507, ex508, and ex509 described below, and each element is connected via a bus ex510.
  • the power supply circuit unit ex505 is activated to an operable state by supplying power to each unit when the power supply is on.
  • the LSI ex500 when performing the encoding process, performs the microphone ex117 and the camera ex113 by the AV I / O ex509 based on the control of the control unit ex501 including the CPU ex502, the memory controller ex503, the stream controller ex504, the drive frequency control unit ex512, and the like.
  • the AV signal is input from the above.
  • the input AV signal is temporarily stored in an external memory ex511 such as SDRAM.
  • the accumulated data is divided into a plurality of times as appropriate according to the processing amount and the processing speed and sent to the signal processing unit ex507, and the signal processing unit ex507 encodes an audio signal and / or video. Signal encoding is performed.
  • the encoding process of the video signal is the encoding process described in the above embodiments.
  • the signal processing unit ex507 further performs processing such as multiplexing the encoded audio data and the encoded video data according to circumstances, and outputs the result from the stream I / Oex 506 to the outside.
  • the output multiplexed data is transmitted to the base station ex107 or written to the recording medium ex215. It should be noted that data should be temporarily stored in the buffer ex508 so as to be synchronized when multiplexing.
  • the memory ex511 is described as an external configuration of the LSI ex500.
  • a configuration included in the LSI ex500 may be used.
  • the number of buffers ex508 is not limited to one, and a plurality of buffers may be provided.
  • the LSI ex500 may be made into one chip or a plurality of chips.
  • control unit ex510 includes the CPU ex502, the memory controller ex503, the stream controller ex504, the drive frequency control unit ex512, and the like, but the configuration of the control unit ex510 is not limited to this configuration.
  • the signal processing unit ex507 may further include a CPU.
  • the CPU ex502 may be configured to include a signal processing unit ex507 or, for example, an audio signal processing unit that is a part of the signal processing unit ex507.
  • the control unit ex501 is configured to include a signal processing unit ex507 or a CPU ex502 having a part thereof.
  • LSI LSI
  • IC system LSI
  • super LSI ultra LSI depending on the degree of integration
  • the method of circuit integration is not limited to LSI, and implementation with a dedicated circuit or a general-purpose processor is also possible.
  • An FPGA Field Programmable Gate Array
  • a reconfigurable processor that can reconfigure the connection and setting of circuit cells inside the LSI may be used.
  • FIG. 24 shows a configuration ex800 in the present embodiment.
  • the drive frequency switching unit ex803 sets the drive frequency high when the video data is generated by the moving image encoding method or apparatus described in the above embodiments.
  • the decoding processing unit ex801 that executes the moving picture decoding method described in each of the above embodiments is instructed to decode the video data.
  • the video data is video data compliant with the conventional standard, compared to the case where the video data is generated by the moving picture encoding method or apparatus shown in the above embodiments, Set the drive frequency low. Then, it instructs the decoding processing unit ex802 compliant with the conventional standard to decode the video data.
  • the drive frequency switching unit ex803 includes the CPU ex502 and the drive frequency control unit ex512 in FIG.
  • the decoding processing unit ex801 that executes the moving picture decoding method described in each of the above embodiments and the decoding processing unit ex802 that conforms to the conventional standard correspond to the signal processing unit ex507 in FIG.
  • the CPU ex502 identifies which standard the video data conforms to. Then, based on the signal from the CPU ex502, the drive frequency control unit ex512 sets the drive frequency. Further, based on the signal from the CPU ex502, the signal processing unit ex507 decodes the video data.
  • the identification information described in the fourth embodiment may be used.
  • the identification information is not limited to that described in the fourth embodiment, and any information that can identify which standard the video data conforms to may be used. For example, it is possible to identify which standard the video data conforms to based on an external signal that identifies whether the video data is used for a television or a disk. In some cases, identification may be performed based on such an external signal.
  • the selection of the driving frequency in the CPU ex502 may be performed based on, for example, a lookup table in which video data standards and driving frequencies are associated with each other as shown in FIG. The look-up table is stored in the buffer ex508 or the internal memory of the LSI, and the CPU ex502 can select the drive frequency by referring to the look-up table.
  • FIG. 25 shows steps for executing the method of the present embodiment.
  • the signal processing unit ex507 acquires identification information from the multiplexed data.
  • the CPU ex502 identifies whether the video data is generated by the encoding method or apparatus described in each of the above embodiments based on the identification information.
  • the CPU ex502 sends a signal for setting the drive frequency high to the drive frequency control unit ex512. Then, the drive frequency control unit ex512 sets a high drive frequency.
  • step exS203 the CPU ex502 drives the signal for setting the drive frequency low. This is sent to the frequency control unit ex512. Then, in the drive frequency control unit ex512, the drive frequency is set to be lower than that in the case where the video data is generated by the encoding method or apparatus described in the above embodiments.
  • the power saving effect can be further enhanced by changing the voltage applied to the LSI ex500 or the device including the LSI ex500 in conjunction with the switching of the driving frequency. For example, when the drive frequency is set low, it is conceivable that the voltage applied to the LSI ex500 or the device including the LSI ex500 is set low as compared with the case where the drive frequency is set high.
  • the setting method of the driving frequency may be set to a high driving frequency when the processing amount at the time of decoding is large, and to a low driving frequency when the processing amount at the time of decoding is small. It is not limited to the method.
  • the amount of processing for decoding video data compliant with the MPEG4-AVC standard is larger than the amount of processing for decoding video data generated by the moving picture encoding method or apparatus described in the above embodiments. It is conceivable that the setting of the driving frequency is reversed to that in the case described above.
  • the method for setting the drive frequency is not limited to the configuration in which the drive frequency is lowered.
  • the voltage applied to the LSIex500 or the apparatus including the LSIex500 is set high.
  • the driving of the CPU ex502 is stopped.
  • the CPU ex502 is temporarily stopped because there is room in processing. Is also possible. Even when the identification information indicates that the video data is generated by the moving image encoding method or apparatus described in each of the above embodiments, if there is a margin for processing, the CPU ex502 is temporarily driven. It can also be stopped. In this case, it is conceivable to set the stop time shorter than in the case where the video data conforms to the conventional standards such as MPEG-2, MPEG4-AVC, and VC-1.
  • a plurality of video data that conforms to different standards may be input to the above-described devices and systems such as a television and a mobile phone.
  • the signal processing unit ex507 of the LSI ex500 needs to support a plurality of standards in order to be able to decode even when a plurality of video data complying with different standards is input.
  • the signal processing unit ex507 corresponding to each standard is used individually, there is a problem that the circuit scale of the LSI ex500 increases and the cost increases.
  • a decoding processing unit for executing the moving picture decoding method shown in each of the above embodiments and a decoding conforming to a standard such as MPEG-2, MPEG4-AVC, or VC-1
  • the processing unit is partly shared.
  • An example of this configuration is shown as ex900 in FIG.
  • the moving picture decoding method shown in each of the above embodiments and the moving picture decoding method compliant with the MPEG4-AVC standard are processed in processes such as entropy coding, inverse quantization, deblocking filter, and motion compensation. Some contents are common.
  • the decoding processing unit ex902 corresponding to the MPEG4-AVC standard is shared, and for the other processing content unique to the present invention not corresponding to the MPEG4-AVC standard, the dedicated decoding processing unit ex901 is used.
  • Configuration is conceivable.
  • a dedicated decoding processing unit ex901 is used for inverse quantization, and other entropy coding, deblocking filter, motion compensation, and the like are used.
  • the decoding processing unit for executing the moving picture decoding method described in each of the above embodiments is shared, and the processing content specific to the MPEG4-AVC standard As for, a configuration using a dedicated decoding processing unit may be used.
  • ex1000 in FIG. 27B shows another example in which processing is partially shared.
  • a dedicated decoding processing unit ex1001 corresponding to processing content unique to the present invention
  • a dedicated decoding processing unit ex1002 corresponding to processing content specific to other conventional standards
  • a moving picture decoding method of the present invention A common decoding processing unit ex1003 corresponding to processing contents common to other conventional video decoding methods is used.
  • the dedicated decoding processing units ex1001 and ex1002 are not necessarily specialized in the processing content specific to the present invention or other conventional standards, and may be capable of executing other general-purpose processing.
  • the configuration of the present embodiment can be implemented by LSI ex500.
  • the circuit scale of the LSI is reduced, and the cost is reduced. It is possible to reduce.
  • the present invention relates to a moving image encoding method / encoding device and a decoding method / decoding device.
  • the present invention relates to a variable length coding method and decoding.

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Abstract

L'invention concerne un procédé de codage vidéo qui diminue la redondance de code pour un coefficient de conversion quantifié qui correspond à une composante DC d'un bloc spécial, et comprend : une étape (S202) pour décider si un bloc prescrit a ou non un prédicteur pour la navigation ; une étape (S204) pour coder (S203) un nombre prévu de coefficients de conversion quantifiés contenus dans le bloc prévu à l'aide d'un premier procédé de codage, et supprimer, par décalage, le nombre prévu de coefficients de conversion quantifiés à partir d'une chaîne de coefficients de conversion quantifiés obtenue par le balayage des coefficients de conversion quantifiés compris dans le bloc prévu ; et une étape (S205) pour coder les coefficients de conversion quantifiés restants à l'aide d'un second procédé de codage, pour générer une seconde chaîne codée.
PCT/JP2011/006876 2010-12-09 2011-12-08 Procédé de codage d'image et procédé de décodage d'image WO2012077349A1 (fr)

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