WO2019181354A1 - Video encoding device, method and program, and video decoding device, method and program - Google Patents

Video encoding device, method and program, and video decoding device, method and program Download PDF

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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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cabac
alignment
bypass
video
video decoding
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French (fr)
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

Provided is a video encoding device with which it is possible to improve the processing speed and compressibility of video encoding and video decoding. A CABAC bypass alignment means 71 performs CABAC alignment for each image sub-block, before group processing of symbols to which the CABAC bypass mode is applied. An enabling/disabling means 72 enables/disables the CABAC bypass alignment means 71 at the picture layer and below. A notification means 73 notifies the video decoding side of control information for explicitly enabling/disabling at or below the picture layer.

Description

映像符号化装置、方法およびプログラム、並びに、映像復号装置、方法およびプログラムVideo coding apparatus, method and program, and video decoding apparatus, method and program
　本発明は、映像符号化装置、映像復号装置、映像符号化方法、映像復号方法、映像符号化プログラムおよび映像復号プログラム、並びに、映像符号化装置と映像復号装置とを含むシステムに関する。 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.
　非特許文献１は、ビットストリーム（圧縮データ）の処理スループットを高める目的で、コンテキスト適応型２値算術符号化（CABAC：Context-based Adaptive Binary Arithmetic Coding）のバイパスアライメントを開示している。 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).
　非特許文献１に記載の技術においては、映像の符号化および映像の復号における処理速度や圧縮率に課題がある。 In the technology described in Non-Patent Document 1, there are problems in processing speed and compression rate in video encoding and video decoding.
　そこで、本発明は、映像の符号化や映像の復号において処理速度や圧縮率を向上させることができる映像符号化装置、映像復号装置、映像符号化方法、映像復号方法、映像符号化プログラムおよび映像復号プログラム、並びに、その映像符号化装置とその映像復号装置とを含むシステムを提供することを目的とする。 Accordingly, 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.
　本発明による映像符号化装置は、CABACを用いる映像符号化装置であって、画像のサブブロック毎に、CABACのバイパスモードが適用されるシンボルのグループの処理前にCABACのアラインを行うCABACバイパスアライメント手段と、ピクチャレイヤ以下でCABACバイパスアライメント手段を有効化／無効化させる有効化／無効化手段と、明示的にピクチャレイヤ以下で有効化／無効化のための制御情報を映像復号側に通知する通知手段とを含むことを特徴とする。 A video encoding apparatus according to the present invention 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.
　本発明による映像復号装置は、CABACを用いる映像復号装置であって、画像のサブブロック毎に、CABACのバイパスモードが適用されるシンボルのグループの処理前にCABACのアラインを行うCABACバイパスアライメント手段と、ピクチャレイヤ以下でCABACバイパスアライメント手段を有効化／無効化させる有効化／無効化手段と、映像符号化側から明示的に通知される有効化／無効化の制御情報を解釈する解釈手段とを含むことを特徴とする。 A video decoding apparatus according to the present invention 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. , An enabling / invalidating means for enabling / disabling the CABAC bypass alignment means below the picture layer, and an interpreting means for interpreting the control information of the enabling / disabling explicitly notified from the video encoding side. It is characterized by including.
　本発明によるシステムは、上記の映像符号化装置と、上記の映像復号装置とを備えることを特徴とする。 A system according to the present invention includes the above-described video encoding device and the above-described video decoding device.
　本発明による映像符号化方法は、CABACを用いる映像符号化方法であって、CABACバイパスアライメント手段が、画像のサブブロック毎に、CABACのバイパスモードが適用されるシンボルのグループの処理前にCABACのアラインを行い、有効化／無効化手段が、ピクチャレイヤ以下でCABACバイパスアライメント手段を有効化／無効化させ、通知手段が、明示的にピクチャレイヤ以下で有効化／無効化のための制御情報を映像復号側に通知することを特徴とする。 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.
　本発明による映像復号方法は、CABACを用いる映像復号方法であって、CABACバイパスアライメント手段が、画像のサブブロック毎に、CABACのバイパスモードが適用されるシンボルのグループの処理前にCABACのアラインを行い、有効化／無効化手段が、ピクチャレイヤ以下でCABACバイパスアライメント手段を有効化／無効化させ、解釈手段が、映像符号化側から明示的に通知される有効化／無効化の制御情報を解釈することを特徴とする。 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.
　本発明による映像符号化プログラムは、コンピュータに、画像のサブブロック毎に、CABACのバイパスモードが適用されるシンボルのグループの処理前にCABACのアラインを行うCABACバイパスアライメント処理、ピクチャレイヤ以下でCABACバイパスアライメント処理を有効化／無効化させる有効化／無効化処理、および、明示的にピクチャレイヤ以下で有効化／無効化のための制御情報を映像復号側に通知する通知処理を実行させることを特徴とする。 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
　本発明による映像復号プログラムは、コンピュータに、画像のサブブロック毎に、CABACのバイパスモードが適用されるシンボルのグループの処理前にCABACのアラインを行うCABACバイパスアライメント処理、ピクチャレイヤ以下でCABACバイパスアライメント処理を有効化／無効化させる有効化／無効化処理、および、映像符号化側から明示的に通知される有効化／無効化の制御情報を解釈する解釈処理を実行させることを特徴とする。 The video decoding program according to the present invention 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.
　本発明によれば、映像の符号化や映像の復号において処理速度や圧縮率を向上させることができる。 According to the present invention, it is possible to improve processing speed and compression rate in video encoding and video decoding.
CABACの処理を説明する説明図である。It is explanatory drawing explaining the process of CABAC. ２値列をレギュラーモードの２値算術符号化によって圧縮する様子を示す図である。It is a figure which shows a mode that a binary sequence is compressed by the binary arithmetic coding of a regular mode. ディジタル化された映像の構成を示す説明図である。It is explanatory drawing which shows the structure of the digitized image | video. 一般的な映像符号化装置の構成を示すブロック図である。It is a block diagram which shows the structure of a general video coding apparatus. 図４に示す一般的な構成における課題を示す説明図である。It is explanatory drawing which shows the subject in the general structure shown in FIG. 本発明の実施形態の映像符号化装置の構成例を示すブロック図である。It is a block diagram which shows the structural example of the video coding apparatus of embodiment of this invention. シンタクス多重化に関するフローチャートである。It is a flowchart regarding syntax multiplexing. 本発明の実施形態の映像復号装置の構成例を示すブロック図である。It is a block diagram which shows the structural example of the video decoding apparatus of embodiment of this invention. シンタクス多重化解除に関するフローチャートである。It is a flowchart regarding syntax demultiplexing. 本発明の映像符号化装置や映像復号装置を実現するための情報処理システムの例を示すブロック図である。It is a block diagram which shows the example of the information processing system for implement | achieving the video encoding apparatus and video decoding apparatus of this invention. 本発明による映像符号化装置と映像復号装置とを含むシステムの例を示すブロック図である。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. 本発明による効果を示す模式図である。It is a schematic diagram which shows the effect by this invention. 本発明の映像符号化装置の概要を示すブロック図である。It is a block diagram which shows the outline | summary of the video coding apparatus of this invention. 本発明の映像復号装置の概要を示すブロック図である。It is a block diagram which shows the outline | summary of the video decoding apparatus of this invention.
　まず、図１を参照してCABACを説明する。 First, CABAC will be described with reference to FIG.
　最初に、予測誤差信号の変換量子化値や動き補償予測のための動きベクトル情報などの符号化データが２値化される。 First, encoded data such as a transform quantization value of a prediction error signal and motion vector information for motion compensation prediction are binarized.
　続いて、２値化された２値列の各ビット（以後、ビットをシンボルと呼ぶ）が固定確率もしくは可変確率で２値算術符号化される。固定確率を用いた２値算術符号化はバイパスモード、可変確率を用いた２値算術符号化はレギュラーモードと呼ばれる。 Subsequently, 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, and binary arithmetic coding using a variable probability is called a regular mode.
　図２は、例として1100の２値列をレギュラーモードの２値算術符号化によって圧縮する様子を示す図である。 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.
　図２において、pxとRxはそれぞれx番目(0≦x≦3)の入力シンボルの劣勢シンボルの発生確率とその時点での２値算術符号化の有効範囲（以降、レンジと呼ぶ）を示す。また、LPSとMPSはそれぞれ劣勢シンボルと優勢シンボルの略であり、例では、それぞれ0と1が関連づけられている。 In FIG. 2, 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.
　２値算術符号化では、入力シンボルとpxに基づいてレンジを逐次分割することによって得られる代表点の値が符号語として出力される。 In binary arithmetic coding, a representative point value obtained by sequentially dividing a range based on an input symbol and px is output as a code word.
　以上で、２値算術符号化の説明を終了する。 This completes the explanation of binary arithmetic coding.
　以上で、CABACの説明を終了する。 This completes the explanation of CABAC.
　続いて、CABACバイパスアライメントを説明する。 Next, CABAC bypass alignment will be explained.
　まず、図３を参照してディジタル化された映像の構成（シーケンス、ピクチャ、スライス、ブロック）を説明する。 First, the configuration (sequence, picture, slice, block) of the digitized video will be described with reference to FIG.
　ピクチャは、映像の一枚の画像である。シーケンスは、連続するピクチャの集合である。スライスは、ピクチャを符号化処理するための最小単位であるブロックの集合である。つまり、ピクチャはスライスの集合、スライスはブロックの集合となる。 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.
　なお、イントラ予測に基づいて符号化されたブロックはイントラブロックと呼ばれ、インター予測に基づいて符号化されたブロックはインターブロックと呼ばれる。 Note that a block coded based on intra prediction is called an intra block, and a block coded based on inter prediction is called an inter block.
　同様に、イントラブロックのみを含むスライスはＩスライスと呼ばれる。イントラブロックに加えて、２枚の参照ピクチャを同時に用いないインター予測を用いるインターブロックも含めることができるスライスはＰスライスと呼ばれる。２枚の参照ピクチャを同時に用いるインター予測を用いるインターブロックを含めることができるスライスはＢスライスと呼ばれる。 Similarly, a slice including only an intra block is called an I slice. In addition to an intra block, 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.
　さらに、Ｉスライスのみを含むピクチャはＩピクチャと呼ばれる。Ｉスライスに加えて、Ｐスライスも含めることができるピクチャはＰピクチャと呼ばれる。Ｂスライスを含めることができるピクチャはＢピクチャと呼ばれる。 Furthermore, a picture including only an I slice is called an I picture. 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.
　以上で、シーケンス、ピクチャ、スライス、および、ブロックの説明を終了する。 This completes the description of the sequence, picture, slice, and block.
　CABACバイパスアライメントは、シーケンスごとにシグナリングされるcabac_bypass_alignment_enabled_flagシンタックスの値によって有効化/無効化される。１の時に有効、０の時に無効となる。 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.
　処理対象のブロックを構成するサブブロックに、後述する変換量子化値の絶対値に関する情報を表すcoeff_abs_level_remainingシンタックスが存在し、尚且つ、CABACバイパスアライメントが有効化されている時、CABACがバイパスモードに切り替わる最初のcoeff_sign_flagシンタックスの処理前に、２値算術符号化のレンジの固定小数表現値を格納するレンジレジスタのサイズを256とする、つまり、アライメントを行う。なお、coeff_sign_flagシンタックスは後述する変換量子化値の正負の符号に関する情報を表す。 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. Before processing of the first coeff_sign_flag syntax to be switched, 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.
　アライメントによって、後続するバイパスモードのシンボルの２値算術符号化および２値算術復号の処理が簡略化される。なぜならば、レンジレジスタの値が確定するため、後続するバイパスモードの複数シンボルを単純なビットシフトによってまとめて処理できるためである。 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.
　一方で、アライメントにより、アライメントの後に処理されるレギュラーモードのシンボルの圧縮効率が低下する。なぜならば、レンジレジスタのサイズが256に強制的に変更されて、オーバヘッド符号量が発生するためである。 On the other hand, due to the alignment, the compression efficiency of regular mode symbols processed after the alignment decreases. This is because the size of the range register is forcibly changed to 256, and an overhead code amount is generated.
　以上で、CABACバイパスアライメントの説明を終了する。 This completes the explanation of CABAC bypass alignment.
　図４を参照して、上述したCABACバイパスアライメントの機能を有するCABACを用いた一般的な映像符号化装置の構成を説明する。 Referring to FIG. 4, a configuration of a general video encoding apparatus using CABAC having the above-described CABAC bypass alignment function will be described.
　図４に示す映像符号化装置は、変換／量子化器１０１、CABAC器１０２、逆変換／逆量子化器１０３、バッファ１０４、予測器１０５、および、多重化器１０６を備える。 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.
　予測器１０５は、ブロック毎に、入力画像信号に対する予測信号を生成する。 The predictor 105 generates a prediction signal for the input image signal for each block.
　変換／量子化器１０１は、入力画像信号から予測信号を減じた予測誤差画像を周波数変換する。 The transform / quantizer 101 performs frequency conversion on a prediction error image obtained by subtracting the prediction signal from the input image signal.
　さらに、変換／量子化器１０１は、周波数変換した予測誤差画像（変換係数）を量子化する。以後、量子化された周波数変換係数を変換量子化値と呼ぶ。 Further, the transform / quantizer 101 quantizes the frequency-converted prediction error image (transform coefficient). Hereinafter, the quantized frequency transform coefficient is referred to as a transform quantization value.
　CABAC器１０２は、予測器１０５が利用する予測パラメータである動きベクトルの差分情報、および、変換量子化値をエントロピー符号化する。ここで、CABAC器１０２は外部から設定されるアライメント制御情報（１もしくは０の値）をcabac_bypass_alignment_enabled_flagとして参照する。 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. Here, the CABAC device 102 refers to alignment control information (value of 1 or 0) set from the outside as cabac_bypass_alignment_enabled_flag.
　逆変換／逆量子化器１０３は、変換量子化値を逆量子化する。さらに、逆変換／逆量子化器１０３は、逆量子化した周波数変換係数を逆周波数変換する。逆周波数変換された再構築予測誤差画像は、予測信号が加えられて、バッファ１０４に供給される。バッファ１０４は、再構築画像を格納する。 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.
　多重化器１０６は、CABAC器１０２から供給される符号語をビットストリームとして多重化する。また、多重化器１０６は、外部から設定されるアライメント制御情報の値をビットストリームに多重化する。 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.
　上述した動作によって、図４に示す映像符号化装置はビットストリームを生成する。 4 is generated by the video encoding apparatus shown in FIG.
　上述したサブブロック毎のCABACバイパスアライメントはシーケンス単位でしか有効化・無効化されない。つまり、ピクチャ毎のビット数の大部分を占める変換量子化値のビット数に応じた処理ができず、映像圧縮装置および映像復号装置における高速処理と高圧縮率のトレードオフを動的に最適化できない課題がある（図５参照）。 The above-mentioned CABAC bypass alignment for each sub-block is enabled / disabled only in sequence units. In other words, 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).
　この課題を解決するために、本発明は、サブブロック毎のCABACバイパスアライメントの有効化/非有効化に対して制御粒度を与える。 In order to solve this problem, the present invention provides a control granularity for enabling / disabling CABAC bypass alignment for each sub-block.
　具体的には、シーケンスよりも細かいピクチャやスライスの粒度で、サブブロック毎のCABACバイパスアライメントの有効化/非有効化を明示的もしくは暗黙的に制御する手段を備える。 Specifically, it has a means to explicitly or implicitly control the activation / deactivation of CABAC bypass alignment for each sub-block with finer picture and slice granularity than the sequence.
実施形態１．
　図６を参照して、明示的にピクチャレイヤ以下の粒度でサブブロック毎のCABACバイパスアライメントを有効化／無効化する、本実施形態の映像符号化装置を説明する。なお、ピクチャレイヤ以下は、例えば、ピクチャレイヤ、スライスレイヤ、ブロックレイヤを意味する。 Embodiment 1. FIG.
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. Note that “picture layer and below” means, for example, a picture layer, a slice layer, and a block layer.
　本実施形態の映像符号化装置は、変換／量子化器１０１、CABAC器１０２、逆変換／逆量子化器１０３、バッファ１０４、予測器１０５、多重化器１０６、および、制御情報生成器１０７を備える。 The video encoding apparatus according to the present embodiment 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. Prepare.
　制御情報生成器１０７は、外部から設定されるアライメント制御情報seqCabacBypassAlignmentEnabledFlagを解釈する。 The control information generator 107 interprets alignment control information seqCabacBypassAlignmentEnabledFlag set from the outside.
　seqCabacBypassAlignmentEnabledFlagが０の時、シーケンスにわたって、サブブロック毎のCABACバイパスアライメントの有効・無効を決定するフラグcabacBypassAlignmentEnabledFlagを０として、CABAC器１０２および多重化器１０６へ供給する。 When seqCabacBypassAlignmentEnabledFlag is 0, 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.
　seqCabacBypassAlignmentEnabledFlagが１の時、ピクチャレイヤ以下の粒度で、フラグcabacBypassAlignmentEnabledFlagの値を動的に決定して、CABAC器１０２および多重化器１０６へ供給する。 When seqCabacBypassAlignmentEnabledFlag is 1, 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.
　動的な決定方法としては、処理対象のピクチャ、スライス、ブロックに対する割り当てビット数を所定のしきい値と比較し、あるしきい値以上であればcabacBypassAlignmentEnabledFlagを１としてもよい。 As a dynamic determination method, the number of bits assigned to a picture, slice, or block to be processed is compared with a predetermined threshold value, and cabacBypassAlignmentEnabledFlag may be set to 1 if it is equal to or greater than a certain threshold value.
　または、上述したＩピクチャ、Ｐピクチャ、およびＢピクチャのピクチャタイプで決定してもよい。例えば、ビット数が他タイプよりも多い傾向を利用してＩピクチャだけでcabacBypassAlignmentEnabledFlagを１としてもよい。 Alternatively, it may be determined by the picture type of the above-mentioned I picture, P picture, and B picture. For example, cabacBypassAlignmentEnabledFlag may be set to 1 only for I pictures using a tendency that the number of bits is larger than other types.
　または、上述したＩスライス、Ｐスライス、およびＢスライスのスライスタイプで決定してもよい。例えば、ビット数が他タイプよりも多い傾向を利用してＩスライスだけでcabacBypassAlignmentEnabledFlagを１としてもよい。 Alternatively, it may be determined by the slice types of the above-described I slice, P slice, and B slice. For example, 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.
　上述したイントラブロックおよびインターブロックのブロックタイプで決定してもよい。例えば、ビット数がインターブロックよりも多い傾向を利用してイントラブロックだけでcabacBypassAlignmentEnabledFlagを１としてもよい。 It may be determined by the intra block and inter block block types described above. For example, 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.
　処理対象のピクチャ、スライス、ブロックのビット数に影響を与える量子化パラメータをしきい値と比較し、あるしきい値以下であればcabacBypassAlignmentEnabledFlagを１としてもよい。あるいは、上述のいずれかを組み合わせてもよい。 Quantization parameters that affect the number of bits of a picture, slice, or block to be processed are compared with a threshold value, and cabacBypassAlignmentEnabledFlag may be set to 1 if it is below a certain threshold value. Alternatively, any of the above may be combined.
　予測器１０５は、ブロック毎に、入力画像信号に対する予測信号を生成する。 The predictor 105 generates a prediction signal for the input image signal for each block.
　変換／量子化器１０１は、入力画像信号から予測信号を減じた予測誤差画像を周波数変換する。さらに、変換／量子化器１０１は、周波数変換した予測誤差画像（変換係数）を量子化する。 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).
　CABAC器１０２は、変換量子化値、および、予測器１０５が利用する予測パラメータである動きベクトルの差分情報などをエントロピー符号化する。ここで、CABAC器１０２は制御情報生成器１０７から供給されるcabacBypassAlignmentEnabledFlagの値をcabac_bypass_alignment_enabled_flagとして参照する。 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. Here, the CABAC device 102 refers to the value of cabacBypassAlignmentEnabledFlag supplied from the control information generator 107 as cabac_bypass_alignment_enabled_flag.
　逆変換／逆量子化器１０３は、変換量子化値を逆量子化する。さらに、逆変換／逆量子化器１０３は、逆量子化した周波数変換係数を逆周波数変換する。逆周波数変換された再構築予測誤差画像は、予測信号が加えられて、バッファ１０４に供給される。バッファ１０４は、再構築画像を格納する。 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.
　多重化器１０６は、CABAC器１０２から供給される符号語をビットストリームとして多重化する。 The multiplexer 106 multiplexes the codeword supplied from the CABAC device 102 as a bit stream.
　本発明の特徴部である、シンタクス多重化に関するフローチャートを図７に示す。 FIG. 7 shows a flowchart regarding syntax multiplexing, which is a feature of the present invention.
　多重化器１０６は、seqCabacBypassAlignmentEnabledFlagの値をビットストリームのシーケンスパラメータセットにsps_cabac_bypass_alignment_enabled_flagシンタクスとして多重化する（ステップＳ１０００１）。 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).
　sps_cabac_bypass_alignment_enabled_flagの値が１の時、多重化器１０６は、さらにピクチャレイヤ以下の粒度で制御情報生成器１０７から供給される、cabacBypassAlignmentEnabledFlagの値をビットストリームに多重化する（ステップＳ１０００２，Ｓ１０００３）。例えば、粒度がピクチャレイヤの時、cabacBypassAlignmentEnabledFlagの値をビットストリームのピクチャパラメータセットにpps_cabac_bypass_alignment_enabled_flagシンタクスとして多重化する。例えば、粒度がスライスレイヤの時、cabacBypassAlignmentEnabledFlagの値をビットストリームのスライスヘッダにslice_cabac_bypass_alignment_enabled_flagシンタクスとして多重化する（ステップＳ１０００４，Ｓ１０００５）。 When the value of sps_cabac_bypass_alignment_enabled_flag is 1, 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). For example, when the granularity is the picture layer, the value of cabacBypassAlignmentEnabledFlag is multiplexed as a pps_cabac_bypass_alignment_enabled_flag syntax in the picture parameter set of the bit stream. For example, when the granularity is a slice layer, the value of cabacBypassAlignmentEnabledFlag is multiplexed as slice_cabac_bypass_alignment_enabled_flag syntax in the slice header of the bitstream (steps S10004 and S10005).
　なお、sps_cabac_bypass_alignment_enabled_flagの値が０の時、pps_cabac_bypass_alignment_enabled_flagシンタクスおよびslice_cabac_bypass_alignment_enabled_flagシンタクスの値の多重化が不要であることはいうまでもない。同様に、pps_cabac_bypass_alignment_enabled_flagの値が０の時、slice_cabac_bypass_alignment_enabled_flagシンタクスの値の多重化が不要であることもいうまでもない。 Needless to say, when the value of sps_cabac_bypass_alignment_enabled_flag is 0, multiplexing of the values of pps_cabac_bypass_alignment_enabled_flag syntax and slice_cabac_bypass_alignment_enabled_flag syntax is not necessary. Similarly, it goes without saying that when the value of pps_cabac_bypass_alignment_enabled_flag is 0, multiplexing of the value of slice_cabac_bypass_alignment_enabled_flag syntax is unnecessary.
　上述した動作によって、本実施形態の映像符号化装置はビットストリームを生成する。 The video encoding apparatus according to the present embodiment generates a bit stream by the above-described operation.
実施形態２．
　図８を参照して、映像符号化側から明示的にピクチャレイヤ以下の粒度でサブブロック毎のCABACバイパスアライメントが有効化／無効化される、本実施形態の映像復号装置を説明する。 Embodiment 2. FIG.
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.
　本実施形態の映像復号装置は、多重化解除器２０１、CABAC器２０２、逆変換／逆量子化器２０３、予測器２０４、バッファ２０５、および、制御情報生成器２０６を備える。 The video decoding apparatus according to the present embodiment 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.
　本発明の特徴部である、シンタクス多重化解除に関するフローチャートを図９に示す。 FIG. 9 shows a flowchart relating to syntax demultiplexing, which is a feature of the present invention.
　制御情報生成器２０６は、多重化解除器２０１にsps_cabac_bypass_alignment_enabled_flagを多重化解除させて得た値をseqCabacBypassAlignmentEnabledFlagに設定する（ステップＳ２０００１）。 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).
　seqCabacBypassAlignmentEnabledFlagが０の時、制御情報生成器２０６は、シーケンスにわたって、サブブロック毎のCABACバイパスアライメントの有効・無効を決定するフラグcabacBypassAlignmentEnabledFlagを０として、CABAC器２０２へ供給する。 When seqCabacBypassAlignmentEnabledFlag is 0, the 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.
　seqCabacBypassAlignmentEnabledFlagが１の時（ステップＳ２０００２）、制御情報生成器２０６は、ピクチャレイヤ以下の粒度で、多重化解除器２０１にpps_cabac_bypass_alignment_enabled_flagやslice_cabac_bypass_alignment_enabled_flagを多重化解除させて、得られた値をcabacBypassAlignmentEnabledFlagに設定する（ステップＳ２０００３～Ｓ２０００５）。 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).
　なお、sps_cabac_bypass_alignment_enabled_flagの値が０の時、pps_cabac_bypass_alignment_enabled_flagシンタクスおよびslice_cabac_bypass_alignment_enabled_flagシンタクスの値の多重化解除をスキップさせることはいうまでもない。同様に、pps_cabac_bypass_alignment_enabled_flagの値が０の時、slice_cabac_bypass_alignment_enabled_flagシンタクスの値の多重化解除をスキップさせることはいうまでもない。 Needless to say, when the value of sps_cabac_bypass_alignment_enabled_flag is 0, demultiplexing of the values of pps_cabac_bypass_alignment_enabled_flag syntax and slice_cabac_bypass_alignment_enabled_flag syntax is skipped. Similarly, when the value of pps_cabac_bypass_alignment_enabled_flag is 0, it goes without saying that demultiplexing of the slice_cabac_bypass_alignment_enabled_flag syntax value is skipped.
　多重化解除器２０１は、入力されるビットストリームを多重化解除して、符号語を抽出する。 The demultiplexer 201 demultiplexes the input bit stream and extracts a code word.
　CABAC器２０２は、符号語をエントロピー復号する。ここで、CABAC器２０２は、制御情報生成器２０６から供給されるcabacBypassAlignmentEnabledFlagの値をcabac_bypass_alignment_enabled_flagとして参照する。 The CABAC unit 202 performs entropy decoding on the codeword. Here, the CABAC device 202 refers to the value of cabacBypassAlignmentEnabledFlag supplied from the control information generator 206 as cabac_bypass_alignment_enabled_flag.
　つまり、処理対象のブロックを構成するサブブロックにcoeff_abs_level_remainingシンタックスが存在し、尚且つ、cabac_bypass_alignment_enabled_flagが１の時（サブブロック毎のCABACバイパスアライメントが有効の時）、CABACがバイパスモードに切り替わる最初のcoeff_sign_flagシンタックスの処理前に、２値算術符号化のレンジの固定小数表現値を格納するレンジレジスタのサイズを256とする、つまり、アライメントを行う。 That is, when coeff_abs_level_remaining syntax exists in the sub-blocks constituting the block to be processed and cabac_bypass_alignment_enabled_flag is 1 (when CABAC bypass alignment for each sub-block is enabled), the first coeff_sign_flag that switches CABAC to bypass mode Before the syntax processing, the size of the range register for storing the fixed decimal representation value of the binary arithmetic coding range is set to 256, that is, alignment is performed.
　CABAC器２０２でエントロピー復号された変換量子化値は逆変換／逆量子化器２０３に供給され、動きベクトルの差分情報などは予測器２０４に供給される。 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.
　逆変換／逆量子化器２０３は、量子化ステップ幅で、変換量子化値を逆量子化する。さらに、逆変換／逆量子化器２０３は、逆量子化した周波数変換係数を逆周波数変換する。 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.
　予測器２０４は、各ブロックの予測信号を生成する。 The predictor 204 generates a prediction signal for each block.
　逆変換／逆量子化器２０３で逆周波数変換された再構築予測誤差画像は、予測器２０４から供給される予測信号が加えられて、再構築ピクチャとしてバッファ２０５に供給される。そして、バッファ２０５に格納された再構築ピクチャがデコード画像として出力される。 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.
　上述した動作に基づいて、本実施形態の映像復号装置はデコード画像を生成する。 Based on the above-described operation, the video decoding apparatus according to the present embodiment generates a decoded image.
［その他の実施形態］
　上述した実施形態の映像符号化装置および映像復号装置においては、明示的にピクチャレイヤ以下の粒度でサブブロック毎のCABACバイパスアライメントを有効化／無効化していたが、暗黙的に有効化／無効化できることはいうまでもない。 [Other Embodiments]
In the video encoding device and the video decoding device according to the above-described embodiment, 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.
　例えば、多重化器１０６がpps_cabac_bypass_alignment_enabled_flagをビットストリームに埋め込まず、制御情報生成器２０６が、上述したＩピクチャ、Ｐピクチャ、およびＢピクチャのピクチャタイプでCABACのバイパスアライメントの有効化／無効化を決定してもよい。または、制御情報生成器２０６は、処理対象のピクチャのビット数に影響を与えるピクチャの量子化パラメータをしきい値と比較することによって、CABACのバイパスアライメントの有効化／無効化を決定してもよい。あるいは、制御情報生成器２０６は、前記のいずれかの組み合わせで、映像符号化におけるやり方と同じやり方でcabacBypassAlignmentEnabledFlagを自動的に決定してよい。 For example, 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. Alternatively, 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. Alternatively, the control information generator 206 may automatically determine cabacBypassAlignmentEnabledFlag in any combination of the above in the same manner as in video encoding.
　また、例えば、多重化器１０６がslice_cabac_bypass_alignment_enabled_flagをビットストリームに埋め込まず、制御情報生成器２０６が、上述したＩスライス、Ｐスライス、およびＢスライスのスライスタイプでCABACのバイパスアライメントの有効化／無効化を決定してもよい。または、制御情報生成器２０６は、処理対象のスライスのビット数に影響を与えるスライスの量子化パラメータをしきい値と比較することによって、CABACのバイパスアライメントの有効化／無効化を決定してもよい。あるいは、制御情報生成器２０６は、前記のいずれかの組み合わせで、映像符号化におけるやり方と同じやり方でcabacBypassAlignmentEnabledFlagを自動的に決定してよい。 Also, for example, 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.
　また、例えば、多重化器１０６がpps_cabac_bypass_alignment_enabled_flagやslice_cabac_bypass_alignment_enabled_flagをビットストリームに埋め込まず、制御情報生成器２０６が、ブロックの量子化パラメータを所定のしきい値と比較して、映像符号化におけるやり方と同じやり方でcabacBypassAlignmentEnabledFlagを自動的に決定してよい(所定のしきい値以下の時に１とする)。無論、多重化器１０６が所定のしきい値を、例えば、明示的にシーケンスパラメータセットにcabac_bypass_alignment_enabled_min_qp_minus1シンタクスとして埋め込んでもよい。 Also, for example, 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). Of course, 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.
　また、例えば、多重化器１０６がpps_cabac_bypass_alignment_enabled_flagやslice_cabac_bypass_alignment_enabled_flagをビットストリームに埋め込まず、制御情報生成器２０６が、上述したイントラブロックおよびインターブロックのブロックタイプをつかって、映像符号化におけるやり方と同じやり方でcabacBypassAlignmentEnabledFlagを自動的に決定してよい。 In addition, for example, 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.
　なお、上記の各実施形態を、ハードウェアで構成することも可能であるが、コンピュータプログラムにより実現することも可能である。図１０に示す情報処理システムは、プロセッサ１００１、プログラムメモリ１００２、映像データを格納するための記憶媒体１００３およびビットストリームを格納するための記憶媒体１００４を備える。記憶媒体１００３と記憶媒体１００４とは、別個の記憶媒体であってもよいし、同一の記憶媒体からなる記憶領域であってもよい。記憶媒体として、ハードディスク等の磁気記憶媒体を用いることができる。プロセッサ１００１は、例えば、プログラムメモリ１００２（プログラムの記録媒体）からプログラム（映像符号化プログラムまたは映像復号プログラム）を読み込み、本発明の映像符号化装置または映像復号装置として動作すればよい。 Note that each of the above embodiments can be configured by hardware, but can also be realized by a computer program. 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.
　続いて、図１１を参照して、上述した本実施形態の映像符号化装置と映像復号装置で構成されるシステムを説明する。本実施形態のシステムは、上述した本発明の実施形態の映像符号化装置１００と上述した本発明の実施形態の映像復号装置２００とが、無線伝送路又は有線伝送路３００で接続されるシステムである。 Subsequently, with reference to FIG. 11, a system constituted by the above-described video encoding device and video decoding device of the present embodiment will be described. 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.
　本発明によれば、シーケンスよりも細かいピクチャやスライスの粒度で、サブブロック毎のCABACバイパスアライメントの有効化/非有効化を制御されて、映像圧縮装置および映像復号装置における高速化と高圧縮率のトレードオフを動的に最適化できる（図１２参照）。 According to the present invention, 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).
　また、映像符号化装置と映像復号装置が共通の制御粒度でCABACバイパスアライメントを有効化/非有効化できることで、映像符号化装置と映像復号装置の高い相互接続性を確保できる。 Also, since 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.
　次に、本発明の概要を説明する。図１３は、本発明の映像符号化装置の概要を示すブロック図である。本発明の映像符号化装置７０は、CABACを用いる。そして、映像符号化装置７０は、CABACバイパスアライメント手段７１と、有効化／無効化手段７２と、通知手段７３とを備える。 Next, the outline of the present invention will be described. 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.
　CABACバイパスアライメント手段７１は、画像のサブブロック毎に、CABACのバイパスモードが適用されるシンボルのグループの処理前にCABACのアラインを行う。 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.
　有効化／無効化手段７２は、ピクチャレイヤ以下でCABACバイパスアライメント手段７１を有効化／無効化させる。 The validation / invalidation means 72 validates / invalidates the CABAC bypass alignment means 71 below the picture layer.
　通知手段７３は、明示的にピクチャレイヤ以下で有効化／無効化のための制御情報を映像復号側に通知する。 The notification means 73 explicitly notifies the video decoding side of control information for enabling / disabling below the picture layer.
　そのような構成により、処理速度や圧縮率を向上させることができる。 Such a configuration can improve processing speed and compression rate.
　図１４は、本発明の映像復号装置の概要を示すブロック図である。本発明の映像復号装置８０は、CABACを用いる。そして、映像復号装置８０は、CABACバイパスアライメント手段８１と、有効化／無効化手段８２と、解釈手段８３とを備える。 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.
　CABACバイパスアライメント手段８１は、画像のサブブロック毎に、CABACのバイパスモードが適用されるシンボルのグループの処理前にCABACのアラインを行う。 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.
　有効化／無効化手段８２は、ピクチャレイヤ以下でCABACバイパスアライメント手段８１を有効化／無効化させる。 The validation / invalidation means 82 validates / invalidates the CABAC bypass alignment means 81 below the picture layer.
　解釈手段８３は、映像符号化側から明示的に通知される有効化／無効化の制御情報を解釈する。 Interpreting means 83 interprets the control information for validation / invalidation explicitly notified from the video encoding side.
　そのような構成により、処理速度や圧縮率を向上させることができる。 Such a configuration can improve processing speed and compression rate.
　以上、実施形態を参照して本願発明を説明したが、本願発明は上記の実施形態に限定されるものではない。本願発明の構成や詳細には、本願発明のスコープ内で当業者が理解し得る様々な変更をすることができる。 The present invention has been described above with reference to the embodiments, but the present invention is not limited to the above-described embodiments. Various changes that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the present invention.
　この出願は、２０１８年３月２２日に出願された米国仮出願６２／６４６６１０を基礎とする優先権を主張し、その開示の全てをここに取り込む。 This application claims priority based on US Provisional Application No. 62 / 646,610 filed on Mar. 22, 2018, the entire disclosure of which is incorporated herein.
産業上の利用の可能性Industrial applicability
　本発明は、映像符号化装置、映像復号装置に好適に適用される。 The present invention is preferably applied to a video encoding device and a video decoding device.
　１０１　変換／量子化器
　１０２　CABAC器
　１０３　逆変換／逆量子化器
　１０４　バッファ
　１０５　予測器
　１０６　多重化器
　１０７　制御情報生成器
　２０１　多重化解除器
　２０２　CABAC器
　２０３　逆変換／逆量子化器
　２０４　予測器
　２０５　バッファ
　２０６　制御情報生成器 101 Transformer / Quantizer 102 CABAC Unit 103 Inverse Transformer / Inverse Quantizer 104 Buffer 105 Predictor 106 Multiplexer 107 Control Information Generator 201 Demultiplexer 202 CABAC Unit 203 Inverse Transformer / Inverse Quantizer 204 Predictor 205 Buffer 206 Control information generator

Claims (7)

  1. 　CABACを用いる映像符号化装置であって、
    　画像のサブブロック毎に、前記CABACのバイパスモードが適用されるシンボルのグループの処理前にCABACのアラインを行うCABACバイパスアライメント手段と、
    　ピクチャレイヤ以下で前記CABACバイパスアライメント手段を有効化／無効化させる有効化／無効化手段と、
    　明示的にピクチャレイヤ以下で有効化／無効化のための制御情報を映像復号側に通知する通知手段と
    　を含むことを特徴とする映像符号化装置。     A video encoding device using CABAC,
    CABAC bypass alignment means for performing CABAC alignment before processing of a group of symbols to which the CABAC bypass mode is applied for each sub-block of the image,
    Enabling / disabling means for enabling / disabling the CABAC bypass alignment means below the picture layer;
    And a notification means for explicitly notifying the video decoding side of control information for validation / invalidation below the picture layer.
  2. 　CABACを用いる映像復号装置であって、
    　画像のサブブロック毎に、前記CABACのバイパスモードが適用されるシンボルのグループの処理前にCABACのアラインを行うCABACバイパスアライメント手段と、
    　ピクチャレイヤ以下で前記CABACバイパスアライメント手段を有効化／無効化させる有効化／無効化手段と、
    　映像符号化側から明示的に通知される有効化／無効化の制御情報を解釈する解釈手段と
    　を含むことを特徴とする映像復号装置。     A video decoding device using CABAC,
    CABAC bypass alignment means for performing CABAC alignment before processing of a group of symbols to which the CABAC bypass mode is applied for each sub-block of the image,
    Enabling / disabling means for enabling / disabling the CABAC bypass alignment means below the picture layer;
    Interpreting means for interpreting validation / invalidation control information explicitly notified from the video coding side.
  3. 　請求項１に記載の映像符号化装置と、
    　請求項２に記載の映像復号装置とを備える
    　ことを特徴とするシステム。     A video encoding device according to claim 1;
    A system comprising: the video decoding device according to claim 2.
  4. 　CABACを用いる映像符号化方法であって、
    　CABACバイパスアライメント手段が、画像のサブブロック毎に、前記CABACのバイパスモードが適用されるシンボルのグループの処理前にCABACのアラインを行い、
    　有効化／無効化手段が、ピクチャレイヤ以下で前記CABACバイパスアライメント手段を有効化／無効化させ、
    　通知手段が、明示的にピクチャレイヤ以下で有効化／無効化のための制御情報を映像復号側に通知する
    　ことを特徴とする映像符号化方法。     A video encoding method using CABAC,
    The CABAC bypass alignment means performs CABAC alignment for each sub-block of the image before processing the symbol group to which the CABAC bypass mode is applied,
    The enabling / inactivating means enables / disables the CABAC bypass alignment means below the picture layer;
    A video encoding method, characterized in that the notification means explicitly notifies the video decoding side of control information for enabling / disabling below the picture layer.
  5. 　CABACを用いる映像復号方法であって、
    　CABACバイパスアライメント手段が、画像のサブブロック毎に、前記CABACのバイパスモードが適用されるシンボルのグループの処理前にCABACのアラインを行い、
    　有効化／無効化手段が、ピクチャレイヤ以下で前記CABACバイパスアライメント手段を有効化／無効化させ、
    　解釈手段が、映像符号化側から明示的に通知される有効化／無効化の制御情報を解釈する
    　ことを特徴とする映像復号方法。     A video decoding method using CABAC,
    The CABAC bypass alignment means performs CABAC alignment for each sub-block of the image before processing the symbol group to which the CABAC bypass mode is applied,
    The enabling / inactivating means enables / disables the CABAC bypass alignment means below the picture layer;
    A video decoding method, wherein the interpreting means interprets the control information for validation / invalidation explicitly notified from the video coding side.
  6. 　コンピュータに、
    　画像のサブブロック毎に、CABACのバイパスモードが適用されるシンボルのグループの処理前にCABACのアラインを行うCABACバイパスアライメント処理、
    　ピクチャレイヤ以下で前記CABACバイパスアライメント処理を有効化／無効化させる有効化／無効化処理、および、
    　明示的にピクチャレイヤ以下で有効化／無効化のための制御情報を映像復号側に通知する通知処理
    　を実行させるための映像符号化プログラム。     On the computer,
    CABAC bypass alignment processing, which performs CABAC alignment before processing a group of symbols to which CABAC bypass mode is applied, for each sub-block of the image
    Enable / disable processing to enable / disable the CABAC bypass alignment processing below the picture layer, and
    A video encoding program for executing notification processing for explicitly notifying control information for enabling / disabling below the picture layer to the video decoding side.
  7. 　コンピュータに、
    　画像のサブブロック毎に、CABACのバイパスモードが適用されるシンボルのグループの処理前にCABACのアラインを行うCABACバイパスアライメント処理、
    　ピクチャレイヤ以下で前記CABACバイパスアライメント処理を有効化／無効化させる有効化／無効化処理、および、
    　映像符号化側から明示的に通知される有効化／無効化の制御情報を解釈する解釈処理
    　を実行させるための映像復号プログラム。     On the computer,
    CABAC bypass alignment processing, which performs CABAC alignment before processing a group of symbols to which CABAC bypass mode is applied, for each sub-block of the image
    Enable / disable processing to enable / disable the CABAC bypass alignment processing below the picture layer, and
    A video decoding program for executing interpretation processing for interpreting control information for validation / invalidation explicitly notified from the video coding side.
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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007150709A (en) * 2005-11-28 2007-06-14 Kyocera Corp Communication method, mobile terminal, and base station
JP2017515339A (en) * 2014-03-16 2017-06-08 ヴィド スケール インコーポレイテッド Method and apparatus for lossless video coding signaling

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007150709A (en) * 2005-11-28 2007-06-14 Kyocera Corp Communication method, mobile terminal, and base station
JP2017515339A (en) * 2014-03-16 2017-06-08 ヴィド スケール インコーポレイテッド Method and apparatus for lossless video coding signaling

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
FLYNN, D. ET AL.: "Overview of the range extensions for the HEVC standard: Tools, profiles, and performance", IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS FOR VIDEO TECHNOLOGY, vol. 26, no. 1, January 2016 (2016-01-01), pages 4 - 19, XP011592176, doi:10.1109/TCSVT.2015.2478707 *
SHARMAN, K. ET AL.: "AHG5 and AHG18: Entropy coding throughput for high bit depths", JOINT COLLABORATIVE TEAM ON VIDEO CODING (JCT-VC) OF ITU-T SG 16 WP 3 AND ISO/IEC JTC 1/SC 29/WG 11 -15TH MEETING15. JCT-VC 15 TH MEETING; 23-10-2013 - 1-11-2013; GENEVA; (JOINT COLLABORATIVE TEAM ON VIDEO CODING OF ISO/IEC JTC1/SC29/WG11 AND ITU-T S, no. JCTVC-00046, 3 October 2013 (2013-10-03) - 1 November 2013 (2013-11-01), Geneva, CH, pages 1 - 16, XP030115014 *
SOLE, J. ET AL.: "AhG5 and AhG18: Bypass bins alignment depending on the rice paramete r", JOINT COLLABORATIVE TEAM ON VIDEO CODING (JCT-VC) OF ITU-T SG 16 WP 3 AND ISO/IEC JTC 1/SC 29/WG 11 15TH MEETING, 20 October 2013 (2013-10-20), Geneva, CH, pages 1 - 5, XP030115253 *

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