WO2013143103A1 - Procédés et appareils de codage en mode intra pour une extension scalable d'un codage vidéo à haute efficacité (hevc) - Google Patents

Procédés et appareils de codage en mode intra pour une extension scalable d'un codage vidéo à haute efficacité (hevc) Download PDF

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Publication number
WO2013143103A1
WO2013143103A1 PCT/CN2012/073253 CN2012073253W WO2013143103A1 WO 2013143103 A1 WO2013143103 A1 WO 2013143103A1 CN 2012073253 W CN2012073253 W CN 2012073253W WO 2013143103 A1 WO2013143103 A1 WO 2013143103A1
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WO
WIPO (PCT)
Prior art keywords
intra
mode
modes
current
higher layer
Prior art date
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PCT/CN2012/073253
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English (en)
Inventor
Mei Guo
Shan Liu
Shaw-Min Lei
Original Assignee
Mediatek Singapore Pte. Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Mediatek Singapore Pte. Ltd. filed Critical Mediatek Singapore Pte. Ltd.
Priority to PCT/CN2012/073253 priority Critical patent/WO2013143103A1/fr
Priority to PCT/CN2013/072403 priority patent/WO2013139212A1/fr
Priority to US14/378,949 priority patent/US10091515B2/en
Priority to EP13763507.4A priority patent/EP2829065B1/fr
Priority to CN201380010197.0A priority patent/CN104247423B/zh
Publication of WO2013143103A1 publication Critical patent/WO2013143103A1/fr

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Classifications

    • 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
    • H04N19/30—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using hierarchical techniques, e.g. scalability
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/50—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding
    • H04N19/593—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding involving spatial prediction techniques
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
    • H04N19/103—Selection of coding mode or of prediction mode
    • H04N19/11—Selection of coding mode or of prediction mode among a plurality of spatial predictive coding modes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/134—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or criterion affecting or controlling the adaptive coding
    • H04N19/157—Assigned coding mode, i.e. the coding mode being predefined or preselected to be further used for selection of another element or parameter
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/169—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
    • H04N19/17—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object
    • H04N19/176—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object the region being a block, e.g. a macroblock
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—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
    • H04N19/187—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 scalable video layer

Definitions

  • the invention relates generally to video processing.
  • the present invention relates to methods and apparatuses of intra mode coding for scalable extension of High Efficiency Video Coding (HEVC).
  • HEVC High Efficiency Video Coding
  • HEVC High Efficiency Video Coding
  • JCT-VC Joint Collaborative Team on Video Coding
  • the prediction unit (PU) for intra coding can be 64x64, 32x32, 16x16, 8x8, and 4x4.
  • 35 intra prediction modes i.e., mode 0 ⁇ mode 34 in Fig. 1, are used for all PU sizes.
  • mode 35 Intra FromLuma is only used for chroma component when chroma_pred_from_luma_enabled_flag is equal to 1.
  • the candModeList[x] is derived as follows:
  • candlntraPredModeB is equal to candlntraPredModeA, the following applies:
  • candModeList[0] and candModeList[l] are derived as follows:
  • candModeList[2] is set equal to Intra Planar
  • candModeList[2] is set equal to Intra DC
  • candModeList[2] is set equal to Intra Angular (26).
  • candlntraPredModeA or candlntraPredModeB is set equal to Intra DC.
  • IntraPredMode If the current intra mode (denoted as IntraPredMode) is equal to any of the most probable modes in candModeList, a flag prev_intra_pred_flag equal to 1 is transmitted followed by the index of the mode that is identical to IntraPredMode in candModeList; otherwise, the remaining mode of IntraPredMode (denoted as rem_intra_luma_pred_mode) is transmitted following the flag prev_intra_pred_flag equal to 0.
  • the chroma PU has 5 or 6 candidate modes depending on chroma_pred_from_luma_enabled_flag. If chroma_pred_from_luma_enabled_flag is equal to 1, six possible chroma modes are given in Table 1; otherwise, five candidates are shown in Table 2.
  • IntraPredMode when chroma_pred_from_luma_enabled_flag is equal to 0 IntraPredMode
  • JVT Joint Video Team
  • VCEG ITU-T Video coding Group
  • MPEG ISO/IEC Moving Picture Experts Group
  • the Joint Video Team has developed a scalable extension to the H.264/AVC video coding standard, in order to support a diverse range of display devices and transmission channel capacities.
  • the scalable extension allows multiple resolutions of a video sequence to be contained in a single bit stream (which is referred to as spatial scalability), together with multiple frame rates and multiple fidelity levels of a sequence within a single compressed bit stream (which are referred to as temporal scalability and quality scalability respectively).
  • the scalable extension of HEVC is being studied and is going to be developed under the JCT-VC group.
  • the scalable extension of H.264/AVC specifies a layered video coding system.
  • the motion-compensation and intra prediction are employed as for non-scalable coding.
  • the inter-layer prediction mechanisms are utilized in order to exploit the redundancy between layers.
  • a macroblock In a higher layer (with larger resolution or higher fidelity level), a macroblock, a residual signal and motion parameters, such as motion partitions, reference indices and motion vectors, could be predicted from the information of one lower layer (with smaller resolution or lower fidelity level).
  • the upsampling or the scaling is required in inter-layer prediction.
  • the scalable extension of H.264/AVC adopts a macroblock type denoted as Intra BL.
  • Intra BL a macroblock type denoted as Intra BL.
  • the prediction signal of the macroblock in higher layer is derived from the corresponding reconstructed block in the reference layer. Upsampling is required to generate the prediction.
  • a block in a lower layer is a representation of its collocated one in a higher layer with lower resolution or lower fidelity. Since the collocated blocks in different layers have similarity in texture, the correlation of their intra modes is desired to be exploited to improve the coding efficiency of the whole coding system.
  • Fig. 1 is a diagram illustrating the intra prediction mode directions.
  • candlntraPredModeA or candlntraPredModeB is set according to the intra modes from collocated PUs in the reference layer.
  • candlntraPredModeA or candlntraPredModeB is set equal to the intra mode of the collocated PU.
  • the intra mode of the collocated PU is first mapped to some a representing mode based on its direction and then the mapping result is assigned to candlntraPredModeA or candlntraPredModeB.
  • the mapping is exemplified in Table 3 and Table 4.
  • Table 4 An example of the mapping based on the directions of intra modes Intra Prediction Mode Mapped to
  • candlntraPredModeA or candlntraPredModeB is set equal to the mode IM D that is derived from the collocated PUs.
  • IM D can be derived from IM L according to the position of the collocated PUs. Numbering the samples of the current PU in higher layer from 0 to (N-1) both horizontally and vertically where NxN is the PU size, a sample at position (i,j) is chosen to determine the IM_D. The intra mode of the PU in reference lower layer that contains the sample corresponding to the one at (i,j) in higher layer is selected as IM D. Any sample within the current PU could be selected to determine the IM D. For example, the top-left sample at (0,0), the sample in the top-
  • IM D can be derived based on the occurrence frequency of intra modes in IM L.
  • the intra mode with the largest occurrence frequency is selected as the IM D.
  • the intra modes in IM L are sorted according to a certain order of candidate intra prediction modes, which may relate to the priority of intra prediction modes. After the sorting, the one in the first place is selected as IM D.
  • the IM D is first selected with the above methods and then mapped to some a representing mode based on the direction.
  • the mapping is exemplified in Table 3 and Table 4.
  • the intra modes in IM L are first mapped to some representing modes according to the direction. Afterwards, the one with the largest occurrence frequency is selected as the IM D.
  • mapping is exemplified in Table 3 and Table 4.
  • the second embodiment derives the most probable modes (i.e., candModeList in HM-6.0) for an intra-coded PU in a higher layer from the intra modes of the collocated PUs in reference lower layer (that are stored in IM L as mentioned before) and the intra modes of the neighboring PUs in higher layer (i.e., candlntraPredModeA and candlntraPredModeB).
  • candlntraPredModeA and candlntraPredModeB are first put into the list of potential most probable modes P MPM. When candlntraPredModeA is identical to candlntraPredModeB, only one of them is included in the list.
  • the intra modes in IM L are sorted according to the position, the occurrence frequency, and the priority of intra modes as mentioned in [0013], while the repeated modes are removed from IM L. Then, the sorted intra modes in IM L are fed into the list P MPM following the intra modes of neighboring PUs. If anyone in IM L is the same as candlntraPredModeA or candlntraPredModeB, it will be excluded from P MPM. Denote the number of the most probable modes allowed in the current higher layer as m. If the number of intra modes in P MPM is smaller than m, the mapping results of intra modes in P MPM are further added into P MPM following the modes from IM L. Finally, the first m intra modes in P MPM are utilized as the most probable modes and fed into candModeList.
  • Intra BL is signaled for each PU in higher layer.
  • a flag is first transmitted to indicate whether the current PU is coded with Intra BL mode or not. If the flag is true, the predicted signal of current PU is derived from the collocated PUs in reference lower layer; otherwise, it is generated with the neighboring PUs in the current higher layer.
  • Intra BL is used as one intra prediction mode in higher layer. If the neighboring PU to the left or on top of the current PU is not available or is not intra coded, candlntraPredModeA or candlntraPredModeB is set equal to Intra BL. Besides, Intra BL is used as one most probable mode and put in the first place of candModeList.
  • Intra BL When Intra BL is treated as one intra prediction mode, there are totally 36 candidate intra prediction modes for luma component. Four of them are chosen as the most probable modes while the others are coded with fixed-length binarization. Intra BL is put in the first place of the list candModeList, followed by the intra modes of neighboring blocks and the ones of collocated blocks in reference layer. The four most probable modes are coded with 2 bin FLC (fix length coding).
  • one of Intra Planar and Intra DC or both of them are not used for intra prediction in higher layer. Then there would be 34 or 33 intra modes. If Intra BL is used as one additional intra mode, there would be 35 or 34 modes. One most probable mode is allowed for 33 intra prediction modes while two most probable modes are allowed for 34 intra prediction modes. The most probable modes could be selected as in [0014] and [0016]. All the remaining modes are coded with fixed- length binarization. One of Intra Planar and Intra DC or both of them are also excluded from intra prediction of chroma component in higher layer. The methods described above can be used in a video encoder as well as in a video decoder.
  • Embodiments of the methods according to the present invention as described above may be implemented in various hardware, software codes, or a combination of both.
  • 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). These 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

La présente invention se rapporte à des procédés de codage en mode Intra pour une extension scalable d'un codage HEVC. La corrélation de modes Intra à partir de différentes couches est exploitée afin d'améliorer l'efficacité de codage du système de codage dans son ensemble. Le mode Intra de PU situées dans une couche supérieure est prédit avec les modes Intra de PU contigües situées dans une couche inférieure de référence.
PCT/CN2012/073253 2012-03-21 2012-03-29 Procédés et appareils de codage en mode intra pour une extension scalable d'un codage vidéo à haute efficacité (hevc) WO2013143103A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
PCT/CN2012/073253 WO2013143103A1 (fr) 2012-03-29 2012-03-29 Procédés et appareils de codage en mode intra pour une extension scalable d'un codage vidéo à haute efficacité (hevc)
PCT/CN2013/072403 WO2013139212A1 (fr) 2012-03-21 2013-03-11 Procédé et appareil pour une dérivation et un codage en mode intra dans un système de codage vidéo scalable
US14/378,949 US10091515B2 (en) 2012-03-21 2013-03-11 Method and apparatus for intra mode derivation and coding in scalable video coding
EP13763507.4A EP2829065B1 (fr) 2012-03-21 2013-03-11 Procédé et appareil pour la dérivation et le codage du mode intra dans un système de codage vidéo scalable
CN201380010197.0A CN104247423B (zh) 2012-03-21 2013-03-11 可伸缩视频编码系统的帧内模式编码方法和装置

Applications Claiming Priority (1)

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PCT/CN2012/073253 WO2013143103A1 (fr) 2012-03-29 2012-03-29 Procédés et appareils de codage en mode intra pour une extension scalable d'un codage vidéo à haute efficacité (hevc)

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Cited By (7)

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WO2015139177A1 (fr) * 2014-03-17 2015-09-24 Mediatek Singapore Pte. Ltd. Procédé amélioré de prévision intra-vecteur
US10003792B2 (en) 2013-05-27 2018-06-19 Microsoft Technology Licensing, Llc Video encoder for images
US10038917B2 (en) 2015-06-12 2018-07-31 Microsoft Technology Licensing, Llc Search strategies for intra-picture prediction modes
US10136140B2 (en) 2014-03-17 2018-11-20 Microsoft Technology Licensing, Llc Encoder-side decisions for screen content encoding
US10136132B2 (en) 2015-07-21 2018-11-20 Microsoft Technology Licensing, Llc Adaptive skip or zero block detection combined with transform size decision
US10924743B2 (en) 2015-02-06 2021-02-16 Microsoft Technology Licensing, Llc Skipping evaluation stages during media encoding
EP4297407A1 (fr) * 2014-11-11 2023-12-27 HFI Innovation Inc. Procédé de codage vidéo à l'aide d'un arbre de codage séparé pour la luminance et la chrominance

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Cited By (7)

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Publication number Priority date Publication date Assignee Title
US10003792B2 (en) 2013-05-27 2018-06-19 Microsoft Technology Licensing, Llc Video encoder for images
WO2015139177A1 (fr) * 2014-03-17 2015-09-24 Mediatek Singapore Pte. Ltd. Procédé amélioré de prévision intra-vecteur
US10136140B2 (en) 2014-03-17 2018-11-20 Microsoft Technology Licensing, Llc Encoder-side decisions for screen content encoding
EP4297407A1 (fr) * 2014-11-11 2023-12-27 HFI Innovation Inc. Procédé de codage vidéo à l'aide d'un arbre de codage séparé pour la luminance et la chrominance
US10924743B2 (en) 2015-02-06 2021-02-16 Microsoft Technology Licensing, Llc Skipping evaluation stages during media encoding
US10038917B2 (en) 2015-06-12 2018-07-31 Microsoft Technology Licensing, Llc Search strategies for intra-picture prediction modes
US10136132B2 (en) 2015-07-21 2018-11-20 Microsoft Technology Licensing, Llc Adaptive skip or zero block detection combined with transform size decision

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