WO2019181354A1 - Dispositif, procédé et programme de codage vidéo, et dispositif, procédé et programme de décodage vidéo - Google Patents

Dispositif, procédé et programme de codage vidéo, et dispositif, procédé et programme de décodage vidéo Download PDF

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Publication number
WO2019181354A1
WO2019181354A1 PCT/JP2019/006632 JP2019006632W WO2019181354A1 WO 2019181354 A1 WO2019181354 A1 WO 2019181354A1 JP 2019006632 W JP2019006632 W JP 2019006632W WO 2019181354 A1 WO2019181354 A1 WO 2019181354A1
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Prior art keywords
cabac
alignment
bypass
video
video decoding
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PCT/JP2019/006632
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English (en)
Japanese (ja)
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慶一 蝶野
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日本電気株式会社
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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
    • H04N19/13—Adaptive entropy coding, e.g. adaptive variable length coding [AVLC] or context adaptive binary arithmetic coding [CABAC]
    • 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
    • H04N19/136—Incoming video signal characteristics or properties
    • 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
    • H04N19/18—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 a set of transform coefficients
    • 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
    • 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
    • H04N19/90—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using coding techniques not provided for in groups H04N19/10-H04N19/85, e.g. fractals
    • H04N19/91—Entropy coding, e.g. variable length coding [VLC] or arithmetic coding

Definitions

  • the present invention relates to a video encoding device, a video decoding device, a video encoding method, a video decoding method, a video encoding program and a video decoding program, and a system including the video encoding device and the video decoding device.
  • Non-Patent Document 1 discloses bypass alignment of context-adaptive binary arithmetic coding (CABAC) for the purpose of increasing the processing throughput of a bit stream (compressed data).
  • CABAC context-adaptive binary arithmetic coding
  • Non-Patent Document 1 In the technology described in Non-Patent Document 1, there are problems in processing speed and compression rate in video encoding and video decoding.
  • the present invention provides a video encoding device, a video decoding device, a video encoding method, a video decoding method, a video encoding program, and a video capable of improving processing speed and compression rate in video encoding and video decoding.
  • An object is to provide a decoding program and a system including the video encoding device and the video decoding device.
  • a video encoding apparatus is a video encoding apparatus using CABAC, and performs CABAC alignment for performing CABAC alignment before processing of a group of symbols to which CABAC bypass mode is applied for each sub-block of an image. And the video decoding side of control information for enabling / disabling the CABAC bypass alignment means below the picture layer and explicitly enabling / disabling below the picture layer. And a notification means.
  • a video decoding apparatus is a video decoding apparatus using CABAC, and includes CABAC bypass alignment means for performing CABAC alignment before processing of a group of symbols to which a CABAC bypass mode is applied for each sub-block of an image.
  • a system according to the present invention includes the above-described video encoding device and the above-described video decoding device.
  • the video encoding method according to the present invention is a video encoding method using CABAC, in which the CABAC bypass alignment means performs CABAC bypass processing for each sub-block of an image before processing a group of symbols to which the CABAC bypass mode is applied. Alignment is performed, and the enabling / disabling means enables / disables the CABAC bypass alignment means below the picture layer, and the notifying means explicitly provides control information for enabling / disabling below the picture layer. The notification is made to the video decoding side.
  • the video decoding method according to the present invention is a video decoding method using CABAC, in which the CABAC bypass alignment unit performs CABAC alignment for each sub-block of an image before processing a group of symbols to which the CABAC bypass mode is applied.
  • the validation / invalidation means activates / invalidates the CABAC bypass alignment means below the picture layer, and the interpretation means provides the control information of validation / invalidation explicitly notified from the video encoding side. It is characterized by interpretation.
  • the video encoding program according to the present invention allows a computer to perform CABAC bypass alignment processing that performs CABAC alignment before processing of a group of symbols to which the CABAC bypass mode is applied, for each sub-block of an image. Enabling / disabling alignment processing and enabling / disabling processing to explicitly notify the video decoding side of control information for enabling / disabling below the picture layer And
  • the video decoding program allows a computer to perform CABAC bypass alignment processing for performing CABAC alignment before processing a group of symbols to which the CABAC bypass mode is applied for each sub-block of an image, and CABAC bypass alignment below a picture layer.
  • An enabling / invalidating process for enabling / disabling the process and an interpreting process for interpreting the enabling / invalidating control information explicitly notified from the video encoding side are executed.
  • FIG. 1 is a block diagram illustrating an example of a system including a video encoding device and a video decoding device according to the present invention. It is a schematic diagram which shows the effect by this invention. It is a block diagram which shows the outline
  • CABAC CABAC will be described with reference to FIG.
  • encoded data such as a transform quantization value of a prediction error signal and motion vector information for motion compensation prediction are binarized.
  • each bit of the binarized binary string (hereinafter, the bit is referred to as a symbol) is binary arithmetic coded with a fixed probability or a variable probability.
  • Binary arithmetic coding using a fixed probability is called a bypass mode
  • binary arithmetic coding using a variable probability is called a regular mode.
  • FIG. 2 is a diagram showing a state in which a binary sequence of 1100 is compressed by binary arithmetic coding in regular mode as an example.
  • px and Rx indicate the occurrence probability of the inferior symbol of the xth (0 ⁇ x ⁇ 3) input symbol and the effective range of binary arithmetic coding at that time (hereinafter referred to as a range).
  • LPS and MPS are abbreviations for inferior symbols and dominant symbols, respectively, and 0 and 1 are associated with each other in the example.
  • a representative point value obtained by sequentially dividing a range based on an input symbol and px is output as a code word.
  • a picture is a single image.
  • a sequence is a set of consecutive pictures.
  • a slice is a set of blocks that are the minimum unit for encoding a picture. That is, a picture is a set of slices, and a slice is a set of blocks.
  • a block coded based on intra prediction is called an intra block
  • a block coded based on inter prediction is called an inter block.
  • a slice including only an intra block is called an I slice.
  • a slice that can include an inter block using inter prediction that does not use two reference pictures at the same time is called a P slice.
  • a slice that can include an inter block that uses inter prediction using two reference pictures simultaneously is called a B slice.
  • I picture a picture including only an I slice.
  • P pictures Pictures that can include P slices in addition to I slices are called P pictures.
  • a picture that can contain a B slice is called a B picture.
  • CABAC bypass alignment is enabled / disabled by the value of cabac_bypass_alignment_enabled_flag syntax signaled for each sequence. Valid when 1 and invalid when 0.
  • CABAC When subblocks constituting the processing target block have a coeff_abs_level_remaining syntax that represents information on the absolute value of the transform quantized value described later, and when CABAC bypass alignment is enabled, CABAC enters the bypass mode.
  • the size of the range register for storing the fixed decimal representation value of the range of binary arithmetic coding is set to 256, that is, alignment is performed.
  • the coeff_sign_flag syntax represents information related to the positive and negative signs of the transform quantization value described later.
  • Alignment simplifies the binary arithmetic coding and binary arithmetic decoding processing of subsequent bypass mode symbols. This is because the value of the range register is fixed, and a plurality of subsequent bypass mode symbols can be processed together by a simple bit shift.
  • FIG. 4 includes a transform / quantizer 101, a CABAC device 102, an inverse transform / inverse quantizer 103, a buffer 104, a predictor 105, and a multiplexer 106.
  • the video encoder shown in FIG. 1 The video encoder shown in FIG. 1
  • the predictor 105 generates a prediction signal for the input image signal for each block.
  • the transform / quantizer 101 performs frequency conversion on a prediction error image obtained by subtracting the prediction signal from the input image signal.
  • the transform / quantizer 101 quantizes the frequency-converted prediction error image (transform coefficient).
  • the quantized frequency transform coefficient is referred to as a transform quantization value.
  • the CABAC unit 102 entropy-encodes motion vector difference information, which is a prediction parameter used by the predictor 105, and a transform quantization value.
  • the CABAC device 102 refers to alignment control information (value of 1 or 0) set from the outside as cabac_bypass_alignment_enabled_flag.
  • the inverse transform / inverse quantizer 103 inversely quantizes the transform quantized value. Further, the inverse transform / inverse quantizer 103 performs inverse frequency transform on the frequency transform coefficient obtained by inverse quantization.
  • the reconstructed prediction error image subjected to the inverse frequency conversion is supplied with the prediction signal and supplied to the buffer 104.
  • the buffer 104 stores the reconstructed image.
  • the multiplexer 106 multiplexes the codeword supplied from the CABAC device 102 as a bit stream. Further, the multiplexer 106 multiplexes the value of alignment control information set from the outside into the bit stream.
  • CABAC bypass alignment for each sub-block is enabled / disabled only in sequence units.
  • processing according to the number of bits of the transform quantization value that occupies most of the number of bits per picture cannot be performed, and the trade-off between high-speed processing and high compression ratio in the video compression device and video decoding device is dynamically optimized. There is a problem that cannot be done (see FIG. 5).
  • the present invention provides a control granularity for enabling / disabling CABAC bypass alignment for each sub-block.
  • CABAC bypass alignment for each sub-block with finer picture and slice granularity than the sequence.
  • FIG. 6 With reference to FIG. 6, a video encoding apparatus according to this embodiment that explicitly enables / disables CABAC bypass alignment for each sub-block with a granularity of a picture layer or less will be described.
  • picture layer and below means, for example, a picture layer, a slice layer, and a block layer.
  • the video encoding apparatus includes a transform / quantizer 101, a CABAC device 102, an inverse transform / inverse quantizer 103, a buffer 104, a predictor 105, a multiplexer 106, and a control information generator 107.
  • the control information generator 107 interprets alignment control information seqCabacBypassAlignmentEnabledFlag set from the outside.
  • a flag cabacBypassAlignmentEnabledFlag for determining whether CABAC bypass alignment is enabled or disabled for each sub-block is set to 0 throughout the sequence and supplied to the CABAC device 102 and the multiplexer 106.
  • the value of the flag cabacBypassAlignmentEnabledFlag is dynamically determined with a granularity of the picture layer or less and supplied to the CABAC device 102 and the multiplexer 106.
  • cabacBypassAlignmentEnabledFlag may be set to 1 if it is equal to or greater than a certain threshold value.
  • cabacBypassAlignmentEnabledFlag may be set to 1 only for I pictures using a tendency that the number of bits is larger than other types.
  • the cabacBypassAlignmentEnabledFlag may be set to 1 only with the I slice using a tendency that the number of bits is larger than other types.
  • cabacBypassAlignmentEnabledFlag may be set to 1 only for an intra block using a tendency that the number of bits is larger than that for an inter block.
  • cabacBypassAlignmentEnabledFlag may be set to 1 if it is below a certain threshold value.
  • the predictor 105 generates a prediction signal for the input image signal for each block.
  • the transform / quantizer 101 performs frequency conversion on a prediction error image obtained by subtracting the prediction signal from the input image signal. Further, the transformer / quantizer 101 quantizes the frequency-converted prediction error image (transform coefficient).
  • the CABAC unit 102 entropy-encodes the transform quantization value, the difference information of the motion vector that is the prediction parameter used by the predictor 105, and the like.
  • the CABAC device 102 refers to the value of cabacBypassAlignmentEnabledFlag supplied from the control information generator 107 as cabac_bypass_alignment_enabled_flag.
  • the inverse transform / inverse quantizer 103 inversely quantizes the transform quantized value. Further, the inverse transform / inverse quantizer 103 performs inverse frequency transform on the frequency transform coefficient obtained by inverse quantization.
  • the reconstructed prediction error image subjected to the inverse frequency conversion is supplied with the prediction signal and supplied to the buffer 104.
  • the buffer 104 stores the reconstructed image.
  • the multiplexer 106 multiplexes the codeword supplied from the CABAC device 102 as a bit stream.
  • FIG. 7 shows a flowchart regarding syntax multiplexing, which is a feature of the present invention.
  • the multiplexer 106 multiplexes the value of seqCabacBypassAlignmentEnabledFlag into the sequence parameter set of the bit stream as sps_cabac_bypass_alignment_enabled_flag syntax (step S10001).
  • the multiplexer 106 further multiplexes the value of cabacBypassAlignmentEnabledFlag supplied from the control information generator 107 with a granularity of a picture layer or less into the bitstream (steps S10002 and S10003).
  • the value of cabacBypassAlignmentEnabledFlag is multiplexed as a pps_cabac_bypass_alignment_enabled_flag syntax in the picture parameter set of the bit stream.
  • cabacBypassAlignmentEnabledFlag is multiplexed as slice_cabac_bypass_alignment_enabled_flag syntax in the slice header of the bitstream (steps S10004 and S10005).
  • the video encoding apparatus generates a bit stream by the above-described operation.
  • FIG. 8 With reference to FIG. 8, a video decoding apparatus according to the present embodiment in which CABAC bypass alignment for each sub-block is explicitly enabled / disabled with a granularity below the picture layer from the video encoding side will be described.
  • the video decoding apparatus includes a demultiplexer 201, a CABAC device 202, an inverse transform / inverse quantizer 203, a predictor 204, a buffer 205, and a control information generator 206.
  • FIG. 9 shows a flowchart relating to syntax demultiplexing, which is a feature of the present invention.
  • the control information generator 206 sets a value obtained by causing the demultiplexer 201 to demultiplex sps_cabac_bypass_alignment_enabled_flag to seqCabacBypassAlignmentEnabledFlag (step S20001).
  • control information generator 206 sets the flag cabacBypassAlignmentEnabledFlag for determining the validity / invalidity of CABAC bypass alignment for each sub-block throughout the sequence to 0 and supplies it to the CABAC device 202.
  • step S20002 When seqCabacBypassAlignmentEnabledFlag is 1 (step S20002), the control information generator 206 causes the demultiplexer 201 to demultiplex pps_cabac_bypass_alignment_enabled_flag and slice_cabac_bypass_alignment_enabled_flag with a granularity equal to or less than the picture layer, and sets the obtained value to cabacBypassAlignmentEnabledFlag. Steps S20003 to S20005).
  • the demultiplexer 201 demultiplexes the input bit stream and extracts a code word.
  • the CABAC unit 202 performs entropy decoding on the codeword.
  • the CABAC device 202 refers to the value of cabacBypassAlignmentEnabledFlag supplied from the control information generator 206 as cabac_bypass_alignment_enabled_flag.
  • the first coeff_sign_flag that switches CABAC to bypass mode is set to 256, that is, alignment is performed.
  • the transform quantized value entropy-decoded by the CABAC unit 202 is supplied to the inverse transform / inverse quantizer 203, and motion vector difference information and the like are supplied to the predictor 204.
  • the inverse transform / inverse quantizer 203 inversely quantizes the transform quantization value with the quantization step width. Further, the inverse transform / inverse quantizer 203 performs inverse frequency transform on the frequency transform coefficient obtained by inverse quantization.
  • the predictor 204 generates a prediction signal for each block.
  • the reconstructed prediction error image subjected to inverse frequency transform by the inverse transform / inverse quantizer 203 is added with the prediction signal supplied from the predictor 204 and supplied to the buffer 205 as a reconstructed picture. Then, the reconstructed picture stored in the buffer 205 is output as a decoded image.
  • the video decoding apparatus Based on the above-described operation, the video decoding apparatus according to the present embodiment generates a decoded image.
  • CABAC bypass alignment for each sub-block is explicitly enabled / disabled at a granularity of a picture layer or lower, but is implicitly enabled / disabled. Needless to say, it can be done.
  • the multiplexer 106 does not embed pps_cabac_bypass_alignment_enabled_flag in the bitstream, and the control information generator 206 determines whether to enable / disable CABAC bypass alignment for the picture types of the I picture, P picture, and B picture described above. May be.
  • the control information generator 206 may determine whether to enable / disable CABAC bypass alignment by comparing a quantization parameter of a picture that affects the number of bits of a picture to be processed with a threshold value. Good.
  • the control information generator 206 may automatically determine cabacBypassAlignmentEnabledFlag in any combination of the above in the same manner as in video encoding.
  • the multiplexer 106 does not embed slice_cabac_bypass_alignment_enabled_flag in the bitstream, and the control information generator 206 enables / disables CABAC bypass alignment for the slice types of the I slice, P slice, and B slice described above. You may decide. Alternatively, the control information generator 206 may determine whether to enable / disable the CABAC bypass alignment by comparing the quantization parameter of the slice that affects the number of bits of the slice to be processed with a threshold value. Good. Alternatively, the control information generator 206 may automatically determine cabacBypassAlignmentEnabledFlag in any combination of the above in the same manner as in video encoding.
  • the multiplexer 106 does not embed pps_cabac_bypass_alignment_enabled_flag or slice_cabac_bypass_alignment_enabled_flag in the bitstream, and the control information generator 206 compares the quantization parameter of the block with a predetermined threshold value, and the same method as in the video encoding method
  • the cabacBypassAlignmentEnabledFlag may be automatically determined by (1 when it is below a predetermined threshold).
  • the multiplexer 106 may explicitly embed a predetermined threshold, for example, in the sequence parameter set as cabac_bypass_alignment_enabled_min_qp_minus1 syntax.
  • the multiplexer 106 does not embed pps_cabac_bypass_alignment_enabled_flag or slice_cabac_bypass_alignment_enabled_flag in the bitstream, and the control information generator 206 uses the intra block and inter block block types described above, and uses the same method as in the video encoding method. May be determined automatically.
  • the information processing system illustrated in FIG. 10 includes a processor 1001, a program memory 1002, a storage medium 1003 for storing video data, and a storage medium 1004 for storing a bitstream.
  • the storage medium 1003 and the storage medium 1004 may be separate storage media, or may be storage areas composed of the same storage medium.
  • a magnetic storage medium such as a hard disk can be used as the storage medium.
  • the processor 1001 may read a program (video encoding program or video decoding program) from the program memory 1002 (program recording medium), for example, and operate as the video encoding device or video decoding device of the present invention.
  • the system of the present embodiment is a system in which the video encoding device 100 of the embodiment of the present invention described above and the video decoding device 200 of the embodiment of the present invention described above are connected by a wireless transmission line or a wired transmission path 300. is there.
  • enabling / disabling of CABAC bypass alignment for each sub-block is controlled with a finer picture or slice granularity than the sequence, and high speed and high compression rate in the video compression device and video decoding device are controlled. Can be dynamically optimized (see FIG. 12).
  • the video encoding device and the video decoding device can enable / disable CABAC bypass alignment with a common control granularity, it is possible to ensure high interoperability between the video encoding device and the video decoding device.
  • FIG. 13 is a block diagram showing an outline of the video encoding apparatus of the present invention.
  • the video encoding apparatus 70 of the present invention uses CABAC.
  • the video encoding device 70 includes CABAC bypass alignment means 71, validation / invalidation means 72, and notification means 73.
  • the CABAC bypass alignment unit 71 performs CABAC alignment for each sub-block of an image before processing a group of symbols to which the CABAC bypass mode is applied.
  • the validation / invalidation means 72 validates / invalidates the CABAC bypass alignment means 71 below the picture layer.
  • the notification means 73 explicitly notifies the video decoding side of control information for enabling / disabling below the picture layer.
  • Such a configuration can improve processing speed and compression rate.
  • FIG. 14 is a block diagram showing an outline of the video decoding apparatus of the present invention.
  • the video decoding device 80 of the present invention uses CABAC.
  • the video decoding device 80 includes CABAC bypass alignment means 81, validation / invalidation means 82, and interpretation means 83.
  • the CABAC bypass alignment unit 81 performs CABAC alignment for each sub-block of an image before processing a symbol group to which the CABAC bypass mode is applied.
  • the validation / invalidation means 82 validates / invalidates the CABAC bypass alignment means 81 below the picture layer.
  • Interpreting means 83 interprets the control information for validation / invalidation explicitly notified from the video encoding side.
  • Such a configuration can improve processing speed and compression rate.
  • the present invention is preferably applied to a video encoding device and a video decoding device.

Abstract

L'invention concerne un dispositif de codage vidéo avec lequel il est possible d'améliorer la vitesse de traitement et la compressibilité d'un codage vidéo et d'un décodage vidéo. Un moyen d'alignement de dérivation CABAC 71 effectue un alignement CABAC pour chaque sous-bloc d'image, avant le traitement de groupe de symboles auquel le mode de dérivation CABAC est appliqué. Un moyen d'activation/désactivation 72 active/désactive le moyen d'alignement de dérivation CABAC 71 au niveau de la couche d'image et au-dessous. Un moyen de notification 73 notifie au côté décodage vidéo des informations de commande pour activer/désactiver explicitement au niveau ou au-dessous de la couche d'image.
PCT/JP2019/006632 2018-03-22 2019-02-21 Dispositif, procédé et programme de codage vidéo, et dispositif, procédé et programme de décodage vidéo WO2019181354A1 (fr)

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Citations (2)

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JP2007150709A (ja) * 2005-11-28 2007-06-14 Kyocera Corp 通信方法、移動端末及び基地局
JP2017515339A (ja) * 2014-03-16 2017-06-08 ヴィド スケール インコーポレイテッド 無損失ビデオコーディングのシグナリングのための方法および装置

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JP2007150709A (ja) * 2005-11-28 2007-06-14 Kyocera Corp 通信方法、移動端末及び基地局
JP2017515339A (ja) * 2014-03-16 2017-06-08 ヴィド スケール インコーポレイテッド 無損失ビデオコーディングのシグナリングのための方法および装置

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