WO2012120863A1 - Procédé de codage vidéo et procédé de décodage vidéo - Google Patents

Procédé de codage vidéo et procédé de décodage vidéo Download PDF

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Publication number
WO2012120863A1
WO2012120863A1 PCT/JP2012/001471 JP2012001471W WO2012120863A1 WO 2012120863 A1 WO2012120863 A1 WO 2012120863A1 JP 2012001471 W JP2012001471 W JP 2012001471W WO 2012120863 A1 WO2012120863 A1 WO 2012120863A1
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video
data
motion vector
accuracy
slice
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PCT/JP2012/001471
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English (en)
Japanese (ja)
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敏康 杉尾
西　孝啓
陽司 柴原
寿郎 笹井
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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
    • H04N19/50—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding
    • H04N19/503—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding involving temporal prediction
    • H04N19/51—Motion estimation or motion compensation
    • H04N19/523—Motion estimation or motion compensation with sub-pixel accuracy
    • 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
    • H04N19/103—Selection of coding mode or of prediction mode
    • H04N19/109—Selection of coding mode or of prediction mode among a plurality of temporal predictive coding modes
    • 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
    • H04N19/134—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or criterion affecting or controlling the adaptive coding
    • H04N19/157—Assigned coding mode, i.e. the coding mode being predefined or preselected to be further used for selection of another element or parameter
    • 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
    • H04N19/169—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
    • H04N19/17—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object
    • H04N19/176—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object the region being a block, e.g. a macroblock
    • 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
    • H04N19/70—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals characterised by syntax aspects related to video coding, e.g. related to compression standards

Definitions

  • the present invention relates to a moving image encoding method and a moving image decoding method for encoding or decoding image data with reference to a predicted image.
  • the present invention relates to encoding and decoding of a reference position indicated by a motion vector.
  • Non-patent Document 2 Various studies have been made to increase the encoding efficiency (Non-patent Document 2).
  • Non-patent Document 1 proposes a method of updating which value (for example, 0) is 1 ⁇ 4 pixel accuracy and which is a value indicating 8 pixel accuracy is binary.
  • FIG. 1 is a diagram for explaining data processing of a data structure from the viewpoint of decoding processing for a data structure of a stream described in Section 5.1.14 “Prediction ⁇ ⁇ Unit syntax” of Non-Patent Document 1. It is.
  • PredMode the prediction mode of the prediction unit (PU) to be decoded indicates inter (step S101). In this determination, true is returned when the slice to be decoded is a P slice or a B slice and the prediction mode is 1.
  • Table 1 below shows PredMode determination rules according to the slice type (the pair of P and B and I) proposed in this document (Non-patent Document 1, Table 5-13 “Specification of prediction mode”) ).
  • I shown in the next step is a value indicating how many blocks a 1 PU block is divided into. For example, if 2N ⁇ 2N is specified as the shape of the section, i (number of sections) is “1”, and if N ⁇ N, i is “4”.
  • next step it is determined by a flag merge_flag whether or not a motion vector can be predicted and generated from adjacent blocks such as blocks having different i (step S103). If it cannot be predicted (TRUE in step S103), decoding from the bits is necessary, and the process proceeds to the next step.
  • x indicates a number that determines whether the current processing target is L0 or L1 out of the two motion vectors L0 and L1.
  • step S107 based on entropy_coding_mode_flag, it is determined based on entropy_coding_mode_flag which mvres_flag for Lx (L0 and L1) for each block (block number i) is encoded (step S107).
  • the subsequent decoding process is switched according to the encoding method (step S107 and subsequent steps).
  • step S107 When the determination result in step S107 returns that the value of the flag of mvres_flag (or a sequence of flag values) is encoded by CABAC (Context-based Adaptive Binary Arithmetic Coding), it directly corresponds to the value of this flag.
  • mvres_lx is decoded (value is acquired) according to the context (step S111). For example, the value of the mvres_flag flag of the surrounding block is used as the context.
  • a ref_idx_mvres_l0 (ref_idx_mvres_l1) flag is acquired (step S113). If the ref_idx_mvres_lx flag is explicitly present (in the case of “0”, “1”), or if the field does not exist, in which case the value of mvres_lx indicating the precision is (0 or 1). Is interpreted inside the decoding side. For example, when ref_idx_mvres_lx [i] explicitly indicates “0”, the value of mvres_lx [i] is set to “1” (1/4 pixel).
  • the motion vector difference value (mvd_lx [partition number] [x]) is decoded (step S115).
  • the value of the difference value mvd_lx [section number] [direction] is the difference value (Diff) of the motion vector (MV) whose accuracy is determined by the flag mvres_flag.
  • the accuracy of the motion vector difference value mvd decoded in step S115 is given by the value of the flag mvres_flag.
  • mvd — 10 [partition number] [0] indicates the horizontal component of the difference of motion vectors.
  • mvd — 10 [partition number] [1] indicates the vertical component of the difference of the same vector.
  • mvres_l0 [i] that is, the value of mvres_flag
  • the motion vector is 1 ⁇ 4 precision in both the horizontal and vertical directions.
  • the accuracy is 1/8.
  • JCT-VC Joint Collaborative Team on Video Coding
  • an AMVRES flag (mvres_flag_lx) is defined for each motion vector (the same applies hereinafter including a motion vector difference value).
  • the same data structure is given for mvres_flag in the P slice and the B slice. This means that the field for the mvres_flag flag is reserved in an area in the stream regardless of whether it is B or P.
  • the present invention has been made in view of the above circumstances, and an object thereof is to provide a moving image encoding method and a moving image decoding method capable of improving the encoding efficiency.
  • the video decoding method includes a step of determining the number of motion vectors of a predetermined block, and when the number of motion vectors is 1, the number of motion vectors is 2 And a step of obtaining information on motion vectors for the block with a higher pixel accuracy value and a step of obtaining predicted pixels according to the number of motion vectors associated with the block.
  • the moving picture encoding method includes a step of determining the number of motion vectors for a block to be encoded, and the number of motion vectors is 2 when the number of motion vectors is 1.
  • the determination at the time of decoding the value of the motion vector accuracy (value of the AMVRES flag) is switched according to the slice type.
  • the value of the flag is decoded by using different interpretations (judgments) for the decoding method in the block that is the P slice and the decoding method in the B slice.
  • the AMVRES flag is always on, that is, the motion vector is always determined to be 1/8 precision, and in the case of the B slice, it is always off, that is, the motion vector is always determined to be 1/4 precision. Hold.
  • the interpretation of the value is changed depending on whether the B slice is a single direction or two directions. For example, if the prediction direction is one direction of L0 or L1, the AMVRES flag is always on, that is, the motion vector is always determined to be 1/8 accuracy, and if the prediction direction is 2 directions (Bi), 1/4 accuracy is determined. Judge.
  • the present invention can be realized not only as such a moving image encoding method and a moving image decoding method but also as a characteristic step included in such a moving image encoding method and a moving image decoding method. It can also be realized as a moving image encoding device and a moving image decoding device, or as a program for causing a computer to execute these steps.
  • a program can be realized as a recording medium such as a computer-readable CD-ROM, or can be realized as information, data, or a signal indicating the program.
  • These programs, information, data, and signals may be distributed via a communication network such as the Internet.
  • the coding efficiency is improved by switching the value determination according to the slice type while deleting the AMVRES flag for each motion vector and reducing overhead.
  • FIG. 1 is a flowchart showing a motion vector accuracy decoding processing method in the prior art.
  • FIG. 2 is a flowchart showing a decoding processing method (value holding method) in the first embodiment.
  • FIG. 3 is a diagram for explaining the positional accuracy (integer part, decimal part) of the motion vector.
  • FIG. 4A is a flowchart showing a process flow of the moving picture coding method according to the present invention.
  • FIG. 4B is a block diagram showing a configuration of an embodiment for realizing the moving picture coding method according to the present invention.
  • FIG. 5 is a flowchart showing a processing flow of the moving picture decoding method according to the present invention.
  • FIG. 6 is an overall configuration diagram of a content supply system that realizes a content distribution service.
  • FIG. 6 is an overall configuration diagram of a content supply system that realizes a content distribution service.
  • FIG. 7 is an overall configuration diagram of a digital broadcasting system.
  • FIG. 8 is a block diagram illustrating a configuration example of a television.
  • FIG. 9 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. 10 is a diagram illustrating a structure example of a recording medium that is an optical disk.
  • FIG. 11A illustrates an example of a mobile phone.
  • FIG. 11B is a block diagram illustrating a configuration example of a mobile phone.
  • FIG. 12 is a diagram showing a structure of multiplexed data.
  • FIG. 13 is a diagram schematically showing how each stream is multiplexed in the multiplexed data.
  • FIG. 14 is a diagram showing in more detail how the video stream is stored in the PES packet sequence.
  • FIG. 15 is a diagram showing the structure of TS packets and source packets in multiplexed data.
  • FIG. 16 is a diagram illustrating a data structure of the PMT.
  • FIG. 17 is a diagram showing an internal configuration of multiplexed data information.
  • FIG. 18 is a diagram showing the internal structure of the stream attribute information.
  • FIG. 19 is a diagram illustrating steps for identifying video data.
  • FIG. 20 is a block diagram illustrating a configuration example of an integrated circuit that realizes the moving picture coding method and the moving picture decoding method according to each embodiment.
  • FIG. 21 is a diagram illustrating a configuration for switching the driving frequency.
  • FIG. 21 is a diagram illustrating a configuration for switching the driving frequency.
  • FIG. 22 is a diagram illustrating steps for identifying video data and switching between driving frequencies.
  • FIG. 23 is a diagram illustrating an example of a lookup table in which video data standards are associated with driving frequencies.
  • FIG. 24A is a diagram illustrating an example of a configuration for sharing a module of a signal processing unit.
  • FIG. 24B is a diagram illustrating another example of a configuration for sharing a module of a signal processing unit.
  • R2 In the case of a P slice using one motion vector MV, encoding is performed with 1 / 2n accuracy (for example, 1/8 accuracy). In the P slice having only one motion vector MV, it is possible to prevent the quality of the predicted image due to motion compensation from being lowered at the same 1/4 accuracy as that of the B slice.
  • a code string is generated with a value that conforms to the above rule as a default value (a value with a higher probability of occurrence).
  • an implied value (or a local default value, a value that has a higher probability of occurrence)
  • the AMVRES flag is always on, that is, the motion vector is always determined to be 1/8 precision
  • the AMVRES flag is always off, that is, the motion vector is always determined to be 1/4 precision
  • FIG. 2 is a flowchart for explaining a decoding method for decoding a code string according to the encoding / decoding rule of the first embodiment.
  • FIG. 2 the same steps as those in FIG. 1 are denoted by the same reference numerals.
  • step S107 it is determined whether or not the encoded data of the block is encoded in the CABAC encoding mode in step S107 (step S107).
  • step S201 it is determined whether or not the slice type is P (step S201). Then, using the distinction as to whether the slice type is P or B, the value (or the implicit meaning of the code string) is interpreted.
  • a default value (a value when there is no value or a value with a higher probability of occurrence, for example, “0”) is set to 1/8 precision. (Step S203).
  • step S201 If the result of determination in step S201 does not indicate that it is a P slice (if it is a block of a B slice), a default value (a value when there is no value or a value with a higher probability of occurrence) It is assumed that the accuracy is lower than the P slice (for example, 1/4 accuracy) (step S205).
  • step S101 in FIG. 1 P or B is interpreted in a unified manner, but a data structure that can distinguish between the P slice and the B slice at the time of step S101 is defined. Also good.
  • sample interpolation process example interpolation process
  • control unit starts the inter prediction process when a P slice or a B slice is input.
  • This process basically corresponds to the contents of section 8.4.1 in Non-Patent Document 2 or Non-Patent Document 3.
  • the value of mvd_lX from the bitstream is distinguished between the P slice and the B slice. Obtain with accuracy according to the rules described above.
  • the value of the motion vector difference mvd_L0 is held in the memory assuming that the value is expressed with 1/8 precision. If the input slices are B slices, the values of the motion vector difference mvd_l0 and the value of the motion vector difference mvd_l1 are stored in the memory, assuming that both of them are 1/4 precision values.
  • a motion vector prediction value mvp corresponding to this motion vector difference value mvd is acquired.
  • the middle value of the motion vector value of the upper left block is acquired.
  • Equation 1 the difference value mvdLx [0. . 1] and the motion vector mvLx [0. . 1].
  • the x-direction component and the y-component of the derived motion vector mvLx are converted into an integer part (xInt L , yInt L ) and a decimal part (xFrac L , yFrac L ) as shown in the following equations 2 to 5. It is divided.
  • Non-patent document 2 corresponds to formula 8-84 or 85
  • non-patent document 3 corresponds to formulas 8-227 and 228.
  • Table 8-7 of Non-Patent Document 2 is used.
  • FIG. 3 is a 1/4 precision pixel position indicated by the alphabet (A, d, h, n,... R) in the table.
  • xIntL indicates a position (integer unit accuracy) where the horizontal pixel position is xIntL.
  • the hatched pixel positions in the figure indicate pixel samples located at integer pixel positions in both the x and y directions.
  • yIntL indicates a position (integer unit accuracy) where the pixel position is yIntL in the vertical direction.
  • the position of the sample of the predicted sample pixel is the pixel at the position of q in the figure. .
  • the previous position indicated by the motion vector can be obtained with a predetermined pixel accuracy (in the example, 1/4 pixel accuracy).
  • the motion vector accuracy is 1/8 pixel position accuracy (in the case of 3 bits below the decimal point, xFracL and yFracL in Table 2 are each expanded to 0.7, and 64 positions are within one pixel unit. What is necessary is just to provide.
  • the accuracy of the position corresponds to “sample and coefficient used for interpolation”.
  • the value of the pixel b (position of f, j, q) at the 1/2 pixel position in the horizontal direction is expressed by the following formula 6 from the pixel values of E, F, A, H, I, J. May be derived.
  • the value of the pixel a which is a pixel at a 1/4 pixel accuracy position in the horizontal direction is expressed by the following equation 7 by averaging the pixel value of the pixel b at the 1/2 pixel position and the pixel value of the pixel A obtained. Derived as shown.
  • a pixel with decimal pixel precision is a value generated by calculation from a pixel value at an integer position (a pixel indicated by a capital letter in the figure).
  • PredPartC [x, y] (predPartL0C [x, y] + predPartL1C [x, y] +1) >> 1 (Equation 8)
  • the case where one of L0 and L1 does not exist is typically a block in a P slice.
  • the determination at the time of decoding the value of the motion vector accuracy is switched according to the slice type. For example, in the case of the P slice, the AMVRES flag is always on, that is, the motion vector is always determined to be 1/8 precision, and in the case of the B slice, the AMVRES flag is always off, that is, the motion vector is always 1/4 precision. It is judged and held.
  • the accuracy derived from the accuracy of the motion vector indicates that PredPartLx is expressed by a pixel position of 1/8 accuracy unless the accuracy is lost in the calculation process. Pixel value.
  • PredPartC [x, y] (predPartL0C [x, y] + predPartL1C [x, y] +1) >> 1 (Equation 9)
  • the PredPartLx obtained here is the average of the pixels at the 1 ⁇ 4 precision pixel position and the pixels at the 1 ⁇ 4 precision pixel position, and can be said to be a pixel value of 1 / pixel precision substantially.
  • a motion vector for a block having only one motion vector (P slice) is encoded with an accuracy of 1 bit higher than the accuracy when there are two motion vectors (B slice).
  • FIG. 4A is a flowchart showing the flow of processing of the video encoding method according to the present invention
  • FIG. 4B is a block diagram showing the configuration of an embodiment for realizing the video encoding method according to the present invention. It is.
  • the encoding method shown in FIG. 4A is executed by functional blocks called inter-picture prediction encoding unit 11 and entropy encoding unit 12 shown in FIG. 4B.
  • an optimal prediction image for a block to be encoded is created using a predetermined number of motion vectors by evaluation from the viewpoint of encoding efficiency and the like (step S401).
  • step S402 a determination is made according to the number of motion vectors of the encoding target block (or whether the slice type is a P slice or a B slice) (step S402). Note that this determination is not limited to the slice type as long as the information is related to the acquisition of motion vector accuracy.
  • the accuracy of the motion vector is determined to be the first accuracy (step S403).
  • the accuracy of the motion vector is determined to be a second accuracy higher than the first accuracy (step S405).
  • the motion vector difference value is encoded and output according to the determined number of bits (step S407).
  • the motion vector (or motion vector difference value) is held on the assumption that the accuracy of the motion vector differs depending on the slice type.
  • FIG. 5 is a flowchart showing a process flow of the moving picture decoding method according to the present invention.
  • the number of motion vectors is determined based on whether the decoding target block (or the slice to which the block belongs) is a P slice or a B slice (step S501). Note that this determination is not limited to the slice type as long as it is information related to the acquisition of motion vector accuracy.
  • the accuracy of the motion vector is determined to be the first accuracy (for example, 1 ⁇ 4 pixel accuracy) (step S503).
  • the motion vector difference value is higher in accuracy (for example, 1/8 pixel accuracy) than the first accuracy (for example, 1/4 pixel accuracy).
  • the motion vector difference value (mvd) is decoded and acquired with this accuracy (for example, the expected number of bits) (step S507).
  • a predicted pixel value is acquired or derived so as to have the same accuracy (for example, 1/8 pixel accuracy) regardless of whether the number of motion vectors is a number b or a number a according to the acquired motion vector ( Step S509).
  • the discrimination of motion vector accuracy by distinguishing between the slice type P block and the slice type B block is a relative one in which the other is determined if one can be determined. Therefore, the implementation is not limited to the above example as long as a value having 1 bit accuracy higher than the value of the B slice that refers to two can be implicitly interpreted as the accuracy of the MV of a block that uses one motion vector.
  • the encoding side only needs to perform encoding so that as few bit strings as possible are generated, and the decoding side can confirm the rules.
  • inter_pred_idc decoded before the AMVREF flag is used as the prediction direction.
  • the above two determinations are switched according to the value of this inter_pred_idc. Thereby, the accuracy of one-way prediction can be improved even for the B slice.
  • the discrimination of the flag value of the motion vector accuracy by distinguishing whether the B slice is unidirectional or bi-directional is a relative one in which the other is determined if one can be determined. Therefore, the number of bits is not limited to the above example as long as a value that is 1 bit higher than the value of a B slice that refers to two can be implicitly interpreted as the accuracy of a motion vector (MV) of a block that uses one motion vector.
  • MV motion vector
  • 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.
  • the system has an image encoding / decoding device including an image encoding device using an image encoding method and an image decoding device using an image decoding method.
  • image encoding / decoding device including an image encoding device using an image encoding method and an image decoding device using an image decoding method.
  • Other configurations in the system can be appropriately changed according to circumstances.
  • FIG. 6 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 (that is, the image encoding of the present invention).
  • Function as a device Function as a device) and transmit 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 (that is, functions as the image decoding device of the present invention).
  • 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 also includes at least the moving image encoding device (image encoding device) or the moving image decoding of each of the above embodiments. Any of the devices (image decoding devices) can be incorporated.
  • 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 (that is, data encoded by the image encoding apparatus of the present invention).
  • 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 an apparatus such as the television (receiver) ex300 or the set top box (STB) ex217 (that is, functions as the image decoding apparatus of the present invention).
  • 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. 8 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 each of the audio data and the video data, or encodes the respective information, the audio signal processing unit ex304, the video signal processing unit ex305 (function as the image encoding device or the image decoding device of the present invention). ), A speaker ex307 for outputting the decoded audio signal, and an output unit ex309 having a display unit ex308 such as a display for displaying the decoded video 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. 9 shows a configuration of the information reproducing / recording unit ex400 when data is read from or written to an 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. 10 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 include a configuration in which a GPS receiving unit is added to the configuration illustrated in FIG.
  • FIG. 11A is a diagram showing the 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 ex357.
  • 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. Encode (that is, function as the image encoding apparatus of the present invention), and send the encoded video data to the multiplexing / demultiplexing unit ex353.
  • the audio signal processing unit ex354 encodes the audio signal picked up by the audio input unit ex356 while the camera unit ex365 images a video, a still image, etc., and sends the encoded audio data to the multiplexing / separating unit ex353. To do.
  • 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 unit (modulation / demodulation circuit unit) ex352, 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 shown in each of the above embodiments (that is, functions as the image decoding device of the present invention).
  • video and still images included in the moving image file linked to the home page are displayed from the display unit ex358 via the LCD control unit ex359.
  • 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 or the like is multiplexed with video data is received and transmitted, but data in which character data or the like related to video is multiplexed in addition to audio data It 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. 12 is a diagram showing a structure of multiplexed data.
  • 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. 13 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. 14 shows in more detail how the video stream is stored in the PES packet sequence.
  • the first level in FIG. 14 shows a video frame sequence of the video stream.
  • the second level shows a PES packet sequence.
  • a plurality of Video Presentation Units in a video stream are divided for each picture 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. 15 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, 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. 16 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 as shown in FIG.
  • 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.
  • attribute information about 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. 19 shows the 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. 20 shows a configuration of 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 ex501 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 ex501 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. 21 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 video decoding method shown in each of the above embodiments and the decoding processing unit ex802 that complies with 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. 22 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. 24A.
  • 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.
  • 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. 24B 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 moving image encoding method and the moving image decoding method according to the present invention can be applied to any multimedia data, and can improve the compression rate.
  • a mobile phone, a DVD device, a personal computer, etc. It is useful as a moving image encoding method and a moving image decoding method in storage, transmission, communication, etc. used.

Abstract

La présente invention se rapporte à un procédé de codage vidéo et à un procédé de décodage vidéo adaptés pour améliorer une efficacité de codage. Dans le procédé de codage vidéo selon l'invention, un vecteur de mouvement pour un bloc (tranche P) avec un seul vecteur de mouvement est codé avec une précision qui est de 1 bit supérieure à la précision d'un vecteur de mouvement (tranche B) dans le cas où il y a deux vecteurs de mouvement. Dans le procédé de décodage vidéo selon l'invention, une décision prise durant le décodage et relative à la valeur de précision du vecteur de mouvement (valeur de drapeau AMVRES) est commutée en fonction du type de tranche. Dans le cas d'une tranche P, le drapeau AMVRES est toujours activé. En d'autres termes, il est décidé que le vecteur de mouvement a toujours une précision de 1/8. Dans le cas d'une tranche B, le drapeau AMVRES est toujours désactivé. En d'autres termes, il est décidé que le vecteur de mouvement a toujours une précision de 1/4.
PCT/JP2012/001471 2011-03-08 2012-03-02 Procédé de codage vidéo et procédé de décodage vidéo WO2012120863A1 (fr)

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CN110177274A (zh) * 2014-01-08 2019-08-27 微软技术许可有限责任公司 选择运动向量精度
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