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WO2017219342A1 - Procédés de signalisation de paramètre de quantification pour structure d'arbre binaire et arbre quaternaire (qtbt) - Google Patents

Procédés de signalisation de paramètre de quantification pour structure d'arbre binaire et arbre quaternaire (qtbt) Download PDF

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Publication number
WO2017219342A1
WO2017219342A1 PCT/CN2016/087005 CN2016087005W WO2017219342A1 WO 2017219342 A1 WO2017219342 A1 WO 2017219342A1 CN 2016087005 W CN2016087005 W CN 2016087005W WO 2017219342 A1 WO2017219342 A1 WO 2017219342A1
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WIPO (PCT)
Prior art keywords
delta
chroma
block
depth
offset
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PCT/CN2016/087005
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English (en)
Inventor
Han HUANG
Tzu-Der Chuang
Yu-Wen Huang
Ching-Yeh Chen
Shan Liu
Xiaozhong Xu
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MediaTek Inc
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MediaTek Inc
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Priority to PCT/CN2016/087005 priority Critical patent/WO2017219342A1/fr
Priority to RU2018145680A priority patent/RU2718164C1/ru
Priority to CN202011549243.2A priority patent/CN112689147B/zh
Priority to EP17805771.7A priority patent/EP3453172B1/fr
Priority to US16/304,203 priority patent/US10904580B2/en
Priority to PCT/CN2017/086267 priority patent/WO2017206826A1/fr
Priority to CN201780031613.3A priority patent/CN109196862B/zh
Priority to TW106117845A priority patent/TWI642297B/zh
Publication of WO2017219342A1 publication Critical patent/WO2017219342A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
    • H04N19/124—Quantisation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/169—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
    • H04N19/17—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object
    • H04N19/176—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object the region being a block, e.g. a macroblock
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/46—Embedding additional information in the video signal during the compression process
    • H04N19/463—Embedding additional information in the video signal during the compression process by compressing encoding parameters before transmission
    • 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
    • H04N19/96—Tree coding, e.g. quad-tree coding

Definitions

  • the invention relates generally to video processing.
  • the present invention relates to methods and apparatuses of signaling quantization parameter for quad-tree plus binary tree structure.
  • High-efficiency video coding is the latest video coding standard developed by the Joint Collaborative Team on Video Coding (JCT-VC) .
  • JCT-VC Joint Collaborative Team on Video Coding
  • one slice is partitioned into multiple coding tree units (CTU) .
  • CTU coding tree units
  • SPS sequence parameter set
  • a raster scan method is used for processing the CTU.
  • the CTU is further partitioned into multiple coding units (CU) to adapt to various local characteristics.
  • a quadtree denoted as the coding tree is used to partition the CTU into multiple CUs.
  • CTU size be MxM where M is one of the values of 64, 32, or 16.
  • the CTU can be a single CU or can be split into four smaller units of equal sizes of M/2xM/2, which are nodes of coding tree. If units are leaf nodes of coding tree, the units become CUs. Otherwise, the quadtree splitting process can be iterated until the size for a node reaches a minimum allowed CU size specified in the SPS. This representation results in a recursive structure specified by a coding tree as shown in Fig. 1.
  • the solid lines indicate CU boundaries.
  • the decision whether to code a picture area using inter picture (temporal) or intra picture (spatial) prediction is made at the CU level. Since the minimum CU size can be 8x8, the minimum granularity for switching different basic prediction type is 8x8.
  • One or more prediction units are specified for each CU. Coupled with the CU, the PU works as a basic representative block for sharing the prediction information. Inside one PU, the same prediction process is applied and the relevant information is transmitted to the decoder on a PU basis.
  • a CU can be split into one, two, or four PUs according to the PU splitting type.
  • HEVC defines eight shapes for splitting a CU into PU as shown in Fig. 2. Unlike the CU, the PU may only be split once.
  • a CU After obtaining the residual block by prediction process based on PU splitting type, a CU can be partitioned into transform units (TU) according to another quadtree structure which is analogous to the coding tree for the CU as shown in Fig. 1.
  • the solid lines indicate CU boundaries and dotted lines indicate TU boundaries.
  • the TU is a basic representative block having residual or transform coefficients for applying the integer transform and quantization. For each TU, one integer transform having the same size to the TU is applied to obtain residual coefficients. These coefficients are transmitted to the decoder after quantization on a TU basis.
  • coding tree block CB
  • CB coding block
  • PB prediction block
  • TB transform block
  • Quadtree plus binary tree (QTBT) structure In order to balance the complexity and coding efficiency, it was proposed to combine the quadtree and binary tree structure, which is called as quadtree plus binary tree (QTBT) structure.
  • QTBT binary tree plus binary tree
  • a block is firstly partitioned by a quadtree structure, the quadtree splitting can be iterated until the size for a splitting block reaches the minimum allowed quadtree leaf node size.
  • the leaf quadtree block is not larger than the maximum allowed binary tree root node size, it can be further partitioned by a binary tree structure, the binary tree splitting can be iterated until the size (width or height) for a splitting block reaches the minimum allowed binary tree leaf node size (width or height) or the binary tree depth reaches the maximum allowed binary tree depth.
  • the minimum allowed quadtree leaf node size, the maximum allowed binary tree root node size, the minimum allowed binary tree leaf node width and height, and the maximum allowed binary tree depth can be indicated in the high level syntax such as in SPS.
  • Fig. 3 illustrates an example of block partitioning (left) and its corresponding QTBT (right) .
  • the solid lines indicate quadtree splitting and dotted lines indicate binary tree splitting.
  • each splitting (i.e., non-leaf) node of the binary tree one flag indicates which splitting type (horizontal or vertical) is used, 0 indicates horizontal splitting and 1 indicates vertical splitting.
  • the QTBT structure can be applied separately to luma and chroma for I slice, and applied simultaneously to both luma and chroma (except when certain minimum sizes are reached for chroma) for P and B slice. That is to say that, in I slice, the luma CTB has its QTBT-structured block partitioning, and the two chroma CTBs has another QTBT-structured block partitioning.
  • delta QP signaling is controlled by two flags, cu_qp_delta_enabled_flag and diff_cu_qp_delta_depth.
  • the former is used to indicate delta QP signaling is enabled or disabled, the latter is used to set the minimum size of units in delta QP signaling.
  • cu_qp_delta_enabled_flag 1 specifies that the diff_cu_qp_delta_depth syntax element is present in the PPS and that cu_qp_delta_abs may be present in the transform unit syntax.
  • cu_qp_delta_enabled_flag 0 specifies that the diff_cu_qp_delta_depth syntax element is not present in the PPS and that cu_qp_delta_abs is not present in the transform unit syntax.
  • diff_cu_qp_delta_depth specifies the difference between the luma coding tree block size and the minimum luma coding block size of coding units that convey cu_qp_delta_abs and cu_qp_delta_sign_flag.
  • the minimum luma coding block size of coding units is referred as quantization group.
  • the value of diff_cu_qp_delta_depth shall be in the range of 0 to log2_diff_max_min_luma_coding_block_size, inclusive. When not present, the value of diff_cu_qp_delta_depth is inferred to be equal to 0.
  • log2_diff_max_min_luma_coding_block_size specifies the difference between the maximum and minimum luma coding block size.
  • the variable, Log2MinCuQpDeltaSize is derived as follows:
  • the final QP for a coding block is derived based on signaled delta QP and reference QP.
  • the reference QP derivation is based on quantization group.
  • qP_prev is QP of the previous quantization group in decoding order. If qP_prev is also not available, use slice QP instead.
  • the reference QP is equal to (qP_L + qP_A+ 1) >>1.
  • chroma QP offset signaling is controlled by two flags, cu_chroma_qp_offset_enabled_flag and Log2MinCuChromaQpOffsetSize.
  • the former indicate whether chroma QP offset signaling is enabled or disabled, the later is used to set the minimum size of units in chroma QP offset signaling.
  • cu_chroma_qp_offset_enabled_flag 1 If cu_chroma_qp_offset_enabled_flag equal to 1, then cu_chroma_qp_offset_flag is present and specifies that whether chroma qp offset is used for a block.
  • Log2MinCuChromaQpOffsetSize is derived as:
  • Log2MinCuChromaQpOffsetSize CtbLog2SizeY –diff_cu_chroma_qp_offset_depth.
  • diff_cu_chroma_qp_offset_depth specifies the difference between the luma coding tree block size and the minimum luma coding block size of coding units that convey cu_chroma_qp_offset_flag.
  • the coding block is always square in HEVC, so the block size is equal to the block width or block height.
  • QTBT there’s non-square coding block, how to signal delta QP and chroma QP offset is an issue. How to derive reference QP is also an issue.
  • luma and chroma components are separately coded, so there are two independently QuadTree+BinaryTree CU split structures for luma and chroma components, respectively.
  • How to signal the delta QP and chroma QP offset when separating QTBT CU split structures for luma and chroma components is another issue. In the following, we propose several methods to solve these issues.
  • Fig. 1 is a diagram illustrating an example of coding tree in HEVC.
  • Fig. 2 is a diagram illustrating the PU partition types in HEVC.
  • Fig. 3 is a diagram illustrating an example of QTBT partition.
  • MinCuChromaQpOffsetArea or Log2MinCuChromaQpOffsetArea is defined, and IsCuChromaQpOffsetCoded is set as follows:
  • variable Log2MinCuQpDeltaArea is derived as follows:
  • IsCuQpDeltaCoded and IsCuChromaQpOffsetCoded are set when coding a CU.
  • the diff_cu_qp_delta_depth can be signaled separately for luma and chroma.
  • the diff_cu_qp_delta_depth can be the same for luma and chroma.
  • the diff_cu_qp_delta_depth for chroma can be set as a value that depends on that of luma.
  • the value is diff_cu_qp_delta_depth-n, n can be 1, 2, et cl.
  • the unit of delta QP and chroma QP offset signaling should be one QT leaf block. That is, one delta QP and chroma QP offset are coded and shared for all BT CUs in this QT leaf block.
  • the minimum size of units in delta QP signaling and chroma QP offset can be signaled as the same as that in HEVC.
  • the minimum sizes of units in delta QP signaling MinCuQpDeltaArea or Log2MinCuQpDeltaArea or Log2MinCuQpDeltaSize, can also be separately coded in sequence level, picture level, or slice level.
  • the chroma delta QP can be predicted from the delta QP or QP of co-located luma block.
  • a flag (e.g. “diff_cu_qp_delta_depth_c” may be signalled to specify the difference between the chroma coding tree block size and the minimum chroma coding block size of coding units that convey cu_qp_delta_abs and cu_qp_delta_sign_flag for chroma components.
  • the value of this flag “diff_cu_qp_delta_depth_c” shall be in the range of 0 to log2_diff_max_min_luma_coding_block_size, inclusive. When not present, the value of diff_cu_qp_delta_depth_c is inferred to be equal to 0.
  • a flag can is signaled to indicate that whether the MinCuQpDeltaAreaC or Log2MinCuQpDeltaAreaC of chroma component is the same ratio with the chroma subsample ration. For example, in 4: 2: 0 format, the flag is indicate whether the MinCuQpDeltaAreaC is one-quarter of the MinCuQpDeltaArea, or whether the Log2MinCuQpDeltaAreaC is Log2MinCuQpDeltaArea –2.
  • the last coded QP in the last CTU is used if a neighboring coding quantization group is not available. If the last coded QP in the last CTU is not available, the slice QP is used instead.
  • the reference QP is derived as follows:
  • an embodiment of the present invention can be a circuit integrated into a video compression chip or program codes integrated into video compression software to perform the processing described herein.
  • An embodiment of the present invention may also be program codes to be executed on a Digital Signal Processor (DSP) to perform the processing described herein.
  • DSP Digital Signal Processor
  • the invention may also involve a number of functions to be performed by a computer processor, a digital signal processor, a microprocessor, or field programmable gate array (FPGA) .
  • processors can be configured to perform particular tasks according to the invention, by executing machine-readable software code or firmware code that defines the particular methods embodied by the invention.
  • the software code or firmware codes may be developed in different programming languages and different format or style.
  • the software code may also be compiled for different target platform.
  • different code formats, styles and languages of software codes and other means of configuring code to perform the tasks in accordance with the invention will not depart from the spirit and scope of the invention.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Compression Or Coding Systems Of Tv Signals (AREA)

Abstract

L'invention concerne des procédés de signalisation de paramètre de quantification pour une structure QTBT. Les procédés comprennent des procédés de signalisation de QP delta, des procédés de dérivation de QP de référence, et des procédés de signalisation de décalage de QP de chrominance.
PCT/CN2016/087005 2016-05-28 2016-06-24 Procédés de signalisation de paramètre de quantification pour structure d'arbre binaire et arbre quaternaire (qtbt) Ceased WO2017219342A1 (fr)

Priority Applications (8)

Application Number Priority Date Filing Date Title
PCT/CN2016/087005 WO2017219342A1 (fr) 2016-06-24 2016-06-24 Procédés de signalisation de paramètre de quantification pour structure d'arbre binaire et arbre quaternaire (qtbt)
RU2018145680A RU2718164C1 (ru) 2016-05-28 2017-05-27 Способы и устройства для обработки видео данных с условным направлением сигнала информации параметра квантования
CN202011549243.2A CN112689147B (zh) 2016-05-28 2017-05-27 视频数据处理方法以及装置
EP17805771.7A EP3453172B1 (fr) 2016-05-28 2017-05-27 Procédés et appareils de traitement de données vidéo comportant une signalisation conditionnelle de paramètres de quantification
US16/304,203 US10904580B2 (en) 2016-05-28 2017-05-27 Methods and apparatuses of video data processing with conditionally quantization parameter information signaling
PCT/CN2017/086267 WO2017206826A1 (fr) 2016-05-28 2017-05-27 Procédés et appareils de traitement de données vidéo comportant une signalisation conditionnelle de paramètres de quantification
CN201780031613.3A CN109196862B (zh) 2016-05-28 2017-05-27 视频数据处理方法、装置及相应可读存储介质
TW106117845A TWI642297B (zh) 2016-05-28 2017-05-31 視訊資料處理方法以及裝置及相關非揮發性計算機可讀介質

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CN108737819A (zh) * 2018-05-20 2018-11-02 北京工业大学 一种基于四叉树二叉树结构的灵活编码单元划分方法
WO2020068531A1 (fr) * 2018-09-24 2020-04-02 Interdigital Vc Holdings, Inc. Procédé et appareil permettant de déterminer des paramètres de quantification de chrominance lors de l'utilisation d'arbres de codage distincts concernant la luminance et la chrominance
EP3641312A1 (fr) * 2018-10-18 2020-04-22 InterDigital VC Holdings, Inc. Procédé et appareil de détermination de paramètres de quantification de chominance dans l'utilisation d'arbres de codage séparés pour la luminance et la chrominance
CN111107368A (zh) * 2018-10-26 2020-05-05 北京字节跳动网络技术有限公司 用于分割树决定的快速方法
WO2020177072A1 (fr) * 2019-03-05 2020-09-10 Zte Corporation Quantification de composante transversale dans un codage vidéo
CN112055211A (zh) * 2019-08-15 2020-12-08 华为技术有限公司 视频编码器及qp设置方法
CN112352427A (zh) * 2018-06-18 2021-02-09 交互数字Vc控股公司 基于图像块的非对称二元分区的视频编码和解码的方法和装置
CN112534813A (zh) * 2018-08-16 2021-03-19 联发科技股份有限公司 视频处理系统中色度量化参数导出的方法以及装置
CN113841393A (zh) * 2019-08-27 2021-12-24 腾讯美国有限责任公司 用于qt/bt/tt大小的改进的头语法
CN114598875A (zh) * 2018-09-21 2022-06-07 华为技术有限公司 用于进行反量化的装置和方法
EP4032259A4 (fr) * 2019-09-20 2022-11-23 Alibaba Group Holding Limited Signalisation de paramètre de quantification dans un traitement vidéo
EP3993416A4 (fr) * 2019-06-27 2023-03-15 Samsung Electronics Co., Ltd. Procédé et appareil de codage d'image, et procédé et appareil de décodage d'image

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Cited By (36)

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CN108737819A (zh) * 2018-05-20 2018-11-02 北京工业大学 一种基于四叉树二叉树结构的灵活编码单元划分方法
CN108737819B (zh) * 2018-05-20 2021-06-11 北京工业大学 一种基于四叉树二叉树结构的灵活编码单元划分方法
CN112352427A (zh) * 2018-06-18 2021-02-09 交互数字Vc控股公司 基于图像块的非对称二元分区的视频编码和解码的方法和装置
US11956430B2 (en) * 2018-06-18 2024-04-09 Interdigital Vc Holdings, Inc. Method and apparatus for video encoding and decoding based on asymmetric binary partitioning of image blocks
CN112352427B (zh) * 2018-06-18 2024-04-09 交互数字Vc控股公司 基于图像块的非对称二元分区的视频编码和解码的方法和装置
US20210258576A1 (en) * 2018-06-18 2021-08-19 Interdigital Vc Holdings, Inc. Method and apparatus for video encoding and decoding based on asymmetric binary partitioning of image blocks
US11438590B2 (en) 2018-08-16 2022-09-06 Hfi Innovation Inc. Methods and apparatuses of chroma quantization parameter derivation in video processing system
EP3831061A4 (fr) * 2018-08-16 2022-06-15 HFI Innovation Inc. Procédés et appareils de signalisation de paramètres de quantification dans un système de traitement vidéo
CN112544080A (zh) * 2018-08-16 2021-03-23 联发科技股份有限公司 视频处理系统中发信量化参数的方法以及装置
CN112544080B (zh) * 2018-08-16 2022-11-18 寰发股份有限公司 视频处理系统中发信量化参数的方法以及装置
EP3834413A4 (fr) * 2018-08-16 2022-06-15 HFI Innovation Inc. Procédés et appareils de dérivation de paramètres de quantification de chrominance dans un système de traitement vidéo
CN112534813A (zh) * 2018-08-16 2021-03-19 联发科技股份有限公司 视频处理系统中色度量化参数导出的方法以及装置
US12069257B2 (en) 2018-08-16 2024-08-20 Hfi Innovation Inc. Methods and apparatuses of signaling quantization parameter in video processing system
CN114598875A (zh) * 2018-09-21 2022-06-07 华为技术有限公司 用于进行反量化的装置和方法
CN114598875B (zh) * 2018-09-21 2023-03-24 华为技术有限公司 用于进行量化/反量化的装置和方法及编码/解码装置
US12425593B2 (en) 2018-09-21 2025-09-23 Huawei Technologies Co., Ltd. Apparatus and method for inverse quantization
US11689723B2 (en) 2018-09-21 2023-06-27 Huawei Technologies Co., Ltd. Apparatus and method for inverse quantization
US12177446B2 (en) 2018-09-24 2024-12-24 Interdigital Vc Holdings, Inc. Method and apparatus for determining chroma quantization parameters when using separate coding trees for luma and chroma
JP2022502981A (ja) * 2018-09-24 2022-01-11 インターデイジタル ヴィーシー ホールディングス インコーポレイテッド 輝度および彩度に対して別々のコーディングツリーを使用する場合の彩度量子化パラメータを決定するための方法および装置
WO2020068531A1 (fr) * 2018-09-24 2020-04-02 Interdigital Vc Holdings, Inc. Procédé et appareil permettant de déterminer des paramètres de quantification de chrominance lors de l'utilisation d'arbres de codage distincts concernant la luminance et la chrominance
CN112740683A (zh) * 2018-09-24 2021-04-30 交互数字Vc控股公司 用于在为亮度和色度使用单独的译码树时确定色度量化参数的方法及装置
EP3641312A1 (fr) * 2018-10-18 2020-04-22 InterDigital VC Holdings, Inc. Procédé et appareil de détermination de paramètres de quantification de chominance dans l'utilisation d'arbres de codage séparés pour la luminance et la chrominance
CN111107368B (zh) * 2018-10-26 2024-05-14 北京字节跳动网络技术有限公司 用于分割树决定的快速方法
CN111107368A (zh) * 2018-10-26 2020-05-05 北京字节跳动网络技术有限公司 用于分割树决定的快速方法
WO2020177072A1 (fr) * 2019-03-05 2020-09-10 Zte Corporation Quantification de composante transversale dans un codage vidéo
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