WO2016183814A1 - Codage de drapeau de bloc codé par corrélation entre composantes - Google Patents

Codage de drapeau de bloc codé par corrélation entre composantes Download PDF

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Publication number
WO2016183814A1
WO2016183814A1 PCT/CN2015/079350 CN2015079350W WO2016183814A1 WO 2016183814 A1 WO2016183814 A1 WO 2016183814A1 CN 2015079350 W CN2015079350 W CN 2015079350W WO 2016183814 A1 WO2016183814 A1 WO 2016183814A1
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WO
WIPO (PCT)
Prior art keywords
numsig
cbf
zero
inferred
coded
Prior art date
Application number
PCT/CN2015/079350
Other languages
English (en)
Inventor
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/CN2015/079350 priority Critical patent/WO2016183814A1/fr
Publication of WO2016183814A1 publication Critical patent/WO2016183814A1/fr

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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
    • H04N19/169—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
    • H04N19/186—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 colour or a chrominance component
    • 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 image and video processing.
  • the presented invention relates to image and video coding.
  • an image block is first intra/inter predicted, and then the residual signal is transform coded.
  • a coded block flag is first signaled to indicate the significance of the entire transform block. If CBF is not zero, then the transform coefficients are coded; else, the transform coefficients are inferred to be all zero.
  • the CBF flag is usually independently signaled for each color component.
  • a root CBF flag is used to indicate whether transform coefficients of all color components are zero. If root CBF is zero, then the CBF flags and transform coefficients of all color components are inferred to be zero. If root CBF is not zero, then it indicates that at least one CBF flag in one color component is not zero. So, for example, in YUV color format, if root CBF is not zero and CBF flag in U and V components are both zero, then the CBF flag for Y component is not explicitly coded and is inferred to be not zero. However, when U and V components are not both zero, the CBF flag for Y component should always be explicitly signaled.
  • CABAC Context Based Binary Arithmetic Coding
  • CBF coded block flag
  • Fig. 1 is a diagram illustrating an example of Y component CBF coding depending on the number of significant coefficients in U and V components.
  • CBF signaling for one color component depends on the number of significant coefficients in the other color components.
  • the YUV format is used as example in the following description. The same methods can be applied to other formats as well. It also should be noted that the proposed methods can be applied to any transform method or transform skip. In the case of transform skip, the coefficients in a transform block are the quantized residual signal.
  • CBF_Y, CBF_U, CBF_V denote the CBF of Y, U and V component, respectively.
  • NumSig_Y, NumSig_U, NumSig_V denote the number of significant coefficients in Y, U and V component, respectively.
  • coding of CBF_Y depends on NumSig_U and NumSig_V. For examples:
  • CBF_Y is not explicitly coded, and is inferred to be not zero.
  • CBF_Y is not explicitly coded, and is inferred to be not zero.
  • f (NumSig_U, NumSig_V) NumSig_U+NumSig_V.
  • coding of CBF_V depends on the NumSig_U. For examples:
  • coding of CBF_U depends on the NumSig_V. For examples:
  • context modeling in coding of CBF_Y depends on NumSig_U and NumSig_V. In other words, depending on different values of NumSig_U and NumSig_V, different context models are chosen for CABAC coding of CBF_Y. For examples:
  • f (NumSig_U, NumSig_V) TH
  • f (NumSig_U, NumSig_V) NumSig_U+NumSig_V.
  • context modeling in coding of CBF_V depends on the NumSig_U. In other words, depending on different values of NumSig_U, different context models are chosen to code CBF_V. For examples:
  • context modeling in coding of CBF_U depends on the NumSig_V. In other words, depending on different values of NumSig_V, different context models are chosen to code CBF_U. For examples:
  • the number TH in the above description can be a predefined value in both encoder and decoder or can be signaled to decoder.
  • Embodiments of CBF coding 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) .
  • 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.

Abstract

L'invention concerne un procédé de codage de drapeau de bloc codé CBF. La signalisation de CBF pour une composante de couleur dépend du nombre de coefficients importants dans les autres composantes de couleur.
PCT/CN2015/079350 2015-05-20 2015-05-20 Codage de drapeau de bloc codé par corrélation entre composantes WO2016183814A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/CN2015/079350 WO2016183814A1 (fr) 2015-05-20 2015-05-20 Codage de drapeau de bloc codé par corrélation entre composantes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2015/079350 WO2016183814A1 (fr) 2015-05-20 2015-05-20 Codage de drapeau de bloc codé par corrélation entre composantes

Publications (1)

Publication Number Publication Date
WO2016183814A1 true WO2016183814A1 (fr) 2016-11-24

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PCT/CN2015/079350 WO2016183814A1 (fr) 2015-05-20 2015-05-20 Codage de drapeau de bloc codé par corrélation entre composantes

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103227917A (zh) * 2012-01-31 2013-07-31 华为技术有限公司 解码方法和装置
WO2013142784A2 (fr) * 2012-03-23 2013-09-26 Qualcomm Incorporated Brouillage de drapeau de bloc codé dans un codage vidéo
CN103583048A (zh) * 2011-06-30 2014-02-12 松下电器产业株式会社 图像解码方法、图像编码方法、图像解码装置、图像编码装置及图像编码解码装置
CN104471934A (zh) * 2012-07-02 2015-03-25 三星电子株式会社 对视频进行熵编码的方法和设备以及对视频进行熵解码的方法和设备

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103583048A (zh) * 2011-06-30 2014-02-12 松下电器产业株式会社 图像解码方法、图像编码方法、图像解码装置、图像编码装置及图像编码解码装置
CN103227917A (zh) * 2012-01-31 2013-07-31 华为技术有限公司 解码方法和装置
WO2013142784A2 (fr) * 2012-03-23 2013-09-26 Qualcomm Incorporated Brouillage de drapeau de bloc codé dans un codage vidéo
CN104471934A (zh) * 2012-07-02 2015-03-25 三星电子株式会社 对视频进行熵编码的方法和设备以及对视频进行熵解码的方法和设备

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