WO2015180166A1 - Codage en mode d'intra-prédiction amélioré - Google Patents

Codage en mode d'intra-prédiction amélioré Download PDF

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Publication number
WO2015180166A1
WO2015180166A1 PCT/CN2014/078990 CN2014078990W WO2015180166A1 WO 2015180166 A1 WO2015180166 A1 WO 2015180166A1 CN 2014078990 W CN2014078990 W CN 2014078990W WO 2015180166 A1 WO2015180166 A1 WO 2015180166A1
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WO
WIPO (PCT)
Prior art keywords
intra prediction
block
prediction mode
mode
current block
Prior art date
Application number
PCT/CN2014/078990
Other languages
English (en)
Inventor
Kai Zhang
Jicheng An
Xianguo Zhang
Han HUANG
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.)
Filing date
Publication date
Application filed by Mediatek Singapore Pte. Ltd. filed Critical Mediatek Singapore Pte. Ltd.
Priority to PCT/CN2014/078990 priority Critical patent/WO2015180166A1/fr
Publication of WO2015180166A1 publication Critical patent/WO2015180166A1/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
    • H04N19/10—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
    • H04N19/107—Selection of coding mode or of prediction mode between spatial and temporal predictive coding, e.g. picture refresh

Definitions

  • the invention relates generally to video/image processing.
  • the presented invention relates to intra-mode coding.
  • intra prediction modes there are 35 intra prediction modes including Planar (Mode 0), DC (Mode 1) and 33 angular intra prediction modes (Mode 2- Mode 34) as depicted in Fig. 1.
  • a predictive coding approach is applied to code the intra prediction mode.
  • the intra prediction modes of the above and left neighboring blocks of the current block as depicted in Fig. 2, together with Planar, DC, and Vertical (angular mode 26) modes construct three most probable intra prediction modes for the current block.
  • the intra prediction mode the most probable intra prediction modes are interpreted with shorter code length and other modes are interpreted with longer code length. If a neighboring block is not available or it is not coded as intra mode, the predictive coding process will not access the intra prediction mode from that neighboring block.
  • Intra block copying was adopted to take advantage of reduplicated content in a picture.
  • a reference block in the current picture is copied to the current block as the prediction if IBC is applied.
  • the reference block is located by applying a block- copying vector (BV).
  • BV block- copying vector
  • a block When a block is coded with IBC mode, it does not possess an intra prediction mode.
  • the coding intra prediction mode of a block if a neighboring block is coded as IBC mode, that neighboring block will be treated as unavailable.
  • the intra prediction mode information of neighboring blocks can hardly be utilized when IBC is a usual mode in blocks.
  • the coding efficiency of intra prediction mode harmed due to the lack of accurate neighboring prediction.
  • FIG. 1 is a diagram illustrating intra prediction angle definitions
  • Fig. 2 is a diagram illustrating neighboring blocks of the current block
  • FIG. 3 is a diagram illustrating intra block copying
  • Fig. 4 is a diagram illustrating intra prediction mode inheriting from the reference block for an IBC block
  • Fig. 5 is a diagram illustrating exemplary positions in the reference block which may be covered by a block
  • Fig. 6 is a diagram illustrating examples of intra prediction mode inheriting from different position of the reference block
  • Fig. 7 is a diagram illustrating Intra prediction mode inheriting from the neighboring block
  • FIG. 8 is a diagram illustrating Intra prediction mode inheriting from the reference block for an Inter block
  • Fig. 9 is a diagram illustrating Intra prediction mode inheriting from the reference block for IBC non-squared blocks.
  • an intra prediction mode is assigned to a block when it is coded with IBC mode.
  • the intra prediction mode assigned that neighboring block will be used in the intra prediction mode coding procedure, just like the situation when the neighboring block is coded as the normal intra mode.
  • the intra prediction mode of a block covering or partially covering the reference block for the current block which is coded with IBC mode is assigned to the current block as its intra prediction mode, as demonstrated in Fig. 4.
  • the current block coded with IBC inherits the intra prediction mode, mode A, from the reference block.
  • the block from which the intra prediction mode is inherited can cover any part of the reference block for the current block which is coded with IBC mode, at least one sample.
  • Fig.5 demonstrates some exemplary possible positions which can be covered by the block from which the intra prediction mode is inherited.
  • Fig. 6 demonstrates some exemplary possible blocks from which the intra prediction mode is inherited.
  • the intra prediction mode of the block covering a fixed position of the reference block for the current block which is coded with IBC mode is assigned to the current block as its intra prediction mode.
  • the intra prediction mode of the block covering position X demonstrated in Fig. 5 of the reference block for the current block which is coded with IBC mode is assigned to the current block as its intra prediction mode.
  • intra prediction modes of blocks covering several positions of the reference block for the current block which is coded with IBC mode are checked sequentially and one of them is assigned to the current block as its intra prediction mode.
  • the intra prediction mode of the block covering position Y demonstrated in Fig. 5 of the reference block for the current block which is coded with IBC mode is checked first. If the intra prediction mode of the block covering position Y can be found, then it is assigned to the current block. Otherwise, the intra prediction mode of the block covering position X demonstrated in Fig. 5 of the reference block for the current block which is coded with IBC mode, is checked. If the intra prediction mode of the block covering position X can be found, then it is assigned to the current block.
  • a default intra prediction mode may be assigned to the current block which is coded with IBC mode.
  • the default intra prediction mode can be DC, Planar or any other modes.
  • the default intra prediction mode is assigned to the current block which is coded with IBC mode.
  • the intra prediction mode of a neighboring block of the current block which is coded with IBC mode is assigned to the current block as its intra prediction mode, as demonstrated in Fig. 7.
  • Mode A or Mode B is assigned to the current block when it is coded with IBC.
  • the most probable intra prediction mode (MPM) of the current block which is coded with IBC mode is assigned to the current block as its intra prediction mode.
  • MPM could be obtained as follows. The intra prediction mode prediction process in HEVC is executed first. Then MPM is set to be one of the three most probable modes. For example, it can be set to the first most probable mode of the three most probable modes.
  • an intra prediction mode is assigned to a block when it is coded with Inter mode.
  • the intra prediction mode assigned that neighboring block will be used in the intra prediction mode coding procedure, just like the situation when the neighboring block is coded as the normal intra mode.
  • the intra prediction mode of a block covering or partially covering the reference block for the current block which is coded with Inter mode is assigned to the current block as its intra prediction mode, as demonstrated in Fig. 8.
  • the current block coded with Inter mode inherits the intra prediction mode, mode A, from the reference block.
  • the block from which the intra prediction mode is inherited can cover any part of the reference block for the current block which is coded with Inter mode, at least one sample.
  • Fig.5 demonstrates some exemplary possible positions which can be covered by the block from which the intra prediction mode is inherited.
  • Fig. 6 demonstrates some exemplary possible blocks from which the intra prediction mode is inherited.
  • the intra prediction mode of the block covering a fixed position of the reference block for the current block which is coded with Inter mode is assigned to the current block as its intra prediction mode.
  • the intra prediction mode of the block covering position X demonstrated in Fig. 5 of the reference block for the current block which is coded with Inter mode is assigned to the current block as its intra prediction mode.
  • intra prediction modes of blocks covering several positions of the reference block for the current block which is coded with Inter mode are checked sequentially and one of them is assigned to the current block as its intra prediction mode.
  • the intra prediction mode of the block covering position Y demonstrated in Fig. 5 of the reference block for the current block which is coded with Inter mode is checked first. If the intra prediction mode of the block covering position Y can be found, then it is assigned to the current block. Otherwise, the intra prediction mode of the block covering position X demonstrated in Fig. 5 of the reference block for the current block which is coded with Inter mode, is checked. If the intra prediction mode of the block covering position X can be found, then it is assigned to the current block.
  • a default intra prediction mode may be assigned to the current block which is coded with Inter mode.
  • the default intra prediction mode can be DC, Planar or any other modes.
  • the default intra prediction mode is assigned to the current block which is coded with Inter mode.
  • the intra prediction mode of a neighboring block of the current block which is coded with Inter mode is assigned to the current block as its intra prediction mode, as demonstrated in Fig. 7.
  • Mode A or Mode B is assigned to the current block when it is coded with Inter.
  • the most probable intra prediction mode (MPM) of the current block which is coded with Inter mode is assigned to the current block as its intra prediction mode.
  • MPM could be obtained as follows. The intra prediction mode prediction process in HEVC is executed first. Then MPM is set to be one of the three most probable modes. For example, it can be set to the first most probable mode of the three most probable modes.
  • the current block described in all the methods above can be any shape and size besides a square block.
  • Fig. 9 demonstrates examples where intra prediction mode inherits from the reference block for non-squared blocks with IBC mode.
  • all the methods described above can be applied to any components.
  • they can be applied to Y component, as well as U (Cb) or V (Cr) components.
  • they can be applied to R component, as well as G or B components.
  • 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 codage en mode d'intra-prédiction amélioré. Le fait d'hériter du mode d'intra-prédiction provenant de blocs de référence pour copie intra-bloc (IBC) ou intermode rend un codage en mode d'intra-prédiction plus efficace.
PCT/CN2014/078990 2014-05-30 2014-05-30 Codage en mode d'intra-prédiction amélioré WO2015180166A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/CN2014/078990 WO2015180166A1 (fr) 2014-05-30 2014-05-30 Codage en mode d'intra-prédiction amélioré

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2014/078990 WO2015180166A1 (fr) 2014-05-30 2014-05-30 Codage en mode d'intra-prédiction amélioré

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110393009A (zh) * 2017-03-22 2019-10-29 高通股份有限公司 帧内预测模式传播
WO2020108574A1 (fr) * 2018-11-28 2020-06-04 Beijing Bytedance Network Technology Co., Ltd. Procédé d'amélioration de mode de dérivation de transformée ou de quantification
TWI741589B (zh) * 2019-05-10 2021-10-01 聯發科技股份有限公司 視頻編解碼之亮度mpm列表導出的方法及裝置
US20220166973A1 (en) * 2019-04-10 2022-05-26 Electronics And Telecommunications Research Institute Method and device for signaling prediction mode-related signal in intra prediction
US11825030B2 (en) 2018-12-02 2023-11-21 Beijing Bytedance Network Technology Co., Ltd Intra block copy mode with dual tree partition

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080181309A1 (en) * 2007-01-29 2008-07-31 Samsung Electronics Co., Ltd. Method and apparatus for encoding video and method and apparatus for decoding video
US20080187044A1 (en) * 2007-02-05 2008-08-07 Samsung Electronics Co., Ltd. Method and apparatus for encoding and decoding based on inter prediction
CN102238391A (zh) * 2011-05-25 2011-11-09 深圳市融创天下科技股份有限公司 一种预测编码方法、装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080181309A1 (en) * 2007-01-29 2008-07-31 Samsung Electronics Co., Ltd. Method and apparatus for encoding video and method and apparatus for decoding video
US20080187044A1 (en) * 2007-02-05 2008-08-07 Samsung Electronics Co., Ltd. Method and apparatus for encoding and decoding based on inter prediction
CN102238391A (zh) * 2011-05-25 2011-11-09 深圳市融创天下科技股份有限公司 一种预测编码方法、装置

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110393009A (zh) * 2017-03-22 2019-10-29 高通股份有限公司 帧内预测模式传播
US11496747B2 (en) 2017-03-22 2022-11-08 Qualcomm Incorporated Intra-prediction mode propagation
CN110393009B (zh) * 2017-03-22 2023-03-31 高通股份有限公司 帧内预测模式传播
US12047585B2 (en) 2017-03-22 2024-07-23 Qualcomm Incorporated Intra-prediction mode propagation
WO2020108574A1 (fr) * 2018-11-28 2020-06-04 Beijing Bytedance Network Technology Co., Ltd. Procédé d'amélioration de mode de dérivation de transformée ou de quantification
US11825030B2 (en) 2018-12-02 2023-11-21 Beijing Bytedance Network Technology Co., Ltd Intra block copy mode with dual tree partition
US20220166973A1 (en) * 2019-04-10 2022-05-26 Electronics And Telecommunications Research Institute Method and device for signaling prediction mode-related signal in intra prediction
TWI741589B (zh) * 2019-05-10 2021-10-01 聯發科技股份有限公司 視頻編解碼之亮度mpm列表導出的方法及裝置
US11956421B2 (en) 2019-05-10 2024-04-09 Hfi Innovation Inc. Method and apparatus of luma most probable mode list derivation for video coding

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