WO2017000222A1 - Groupage de segments de dérivation et masquage de données de signe amélioré pour le codage résiduel - Google Patents

Groupage de segments de dérivation et masquage de données de signe amélioré pour le codage résiduel Download PDF

Info

Publication number
WO2017000222A1
WO2017000222A1 PCT/CN2015/082833 CN2015082833W WO2017000222A1 WO 2017000222 A1 WO2017000222 A1 WO 2017000222A1 CN 2015082833 W CN2015082833 W CN 2015082833W WO 2017000222 A1 WO2017000222 A1 WO 2017000222A1
Authority
WO
WIPO (PCT)
Prior art keywords
pass
coeff
flag
scan
size
Prior art date
Application number
PCT/CN2015/082833
Other languages
English (en)
Inventor
Han HUANG
Jicheng An
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/CN2015/082833 priority Critical patent/WO2017000222A1/fr
Priority to CN202011088607.1A priority patent/CN112272298B/zh
Priority to PCT/CN2016/086808 priority patent/WO2016206590A1/fr
Priority to CA2988451A priority patent/CA2988451C/fr
Priority to CN201680036906.6A priority patent/CN107710759B/zh
Priority to EP18215487.2A priority patent/EP3484149B1/fr
Priority to US15/737,406 priority patent/US10382768B2/en
Priority to EP16813706.5A priority patent/EP3292690B1/fr
Publication of WO2017000222A1 publication Critical patent/WO2017000222A1/fr
Priority to US16/171,475 priority patent/US10582203B2/en

Links

Images

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
    • H04N19/48—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using compressed domain processing techniques other than decoding, e.g. modification of transform coefficients, variable length coding [VLC] data or run-length data
    • 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
    • H04N19/467—Embedding additional information in the video signal during the compression process characterised by the embedded information being invisible, e.g. watermarking
    • 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 invention relates generally to image and video coding.
  • Transform coding is widely used in typical image/video coder.
  • An image block either original signal or prediction residual, is first transformed, scaled and quantized, and then the quantized transform coefficients are entropy coded.
  • a Coding Group is defined as a set of 16 consecutive coefficients in scan order. Given the scan order, a CG corresponds to a 4x4 subblock, an example of 8x8 TU consisting 4 CGs is shown in Fig. 1.
  • a syntax element coded_sub_block_flag is signaled to indicate whether a subblock contains non-zero coefficients. If significant, then the coefficient significant flag, sign flag, and absolute level of the subblock are further coded by up to five scan passes. Each scan pass codes a syntax element within a CG, when necessary, as follows:
  • coeff_abs_level_greater1_flag flag indicating whether the absolute value of a coefficient level is greater than 1.
  • coeff_abs_level_greater2_flag flag indicating whether the absolute value of a coefficient level is greater than 2.
  • the bins in the first 3 passes are coded in regular mode (use context)
  • the bins in scan pass 4 and 5 are coded in bypass mode.
  • Grouping bypass bins can increase the throughput of the entropy coder.
  • coding the sign of the last non-zero coefficient is omitted when sign data hiding is applied.
  • the sign value is derived by the parity of the sum of the levels of the CG, even corresponds to positive and odd corresponds to negative.
  • the criterion is the distance in scan order between the first and last non-zero coefficients. If the distance is larger than a threshold, 4 in HEVC, then sign data hiding is applied.
  • Fig. 1 is a diagram illustrating an example of coding groups for 8x8 TU.
  • 3 coefficient scan passes are performed within each CG to code the syntax elements significant_coeff_flag, coeff_abs_level_greater1_flag, and coeff_abs_level_greater2_flag in the first pass of CG scan, 2 coefficient scan passes are performed within each CG to code the syntax coeff_sign_flag and coeff_abs_level_remaining elements in the second pass of CG scan.
  • the CG size in the second pass can be different from the CG size in the first pass.
  • the CG in the first pass corresponds to a 4x4 block size
  • the CG in the second pass corresponds to a 4x2 or 2x4 block size. In this way, the sub-block size for significant flag coding and sign data hiding can be optimized separately.
  • the CG in the first pass corresponds to a 4x4, 4x2 or 2x4 block size depending on TU size, but the CG in the second pass corresponds to a fixed block size, 4x4 for example.
  • the CG in the second pass corresponds to N consecutive coefficients in a predefined scan order (the scan order used in the first pass) .
  • the number N can be 4, 6, 8, 10, 12, 16, 24, 32, 64 et al.
  • the criterion for sign date hiding depends on the CG size in the second pass. For example, if the CG size in the second pass is 24, then the criterion is: when distance between the first and last non-zero coefficients in a CG is larger than 6 (or 8 et al) .
  • the CG sizes in the two passes are explicitly signaled independently.
  • 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.

Landscapes

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

Abstract

L'invention concerne un procédé de groupage de segments de dérivation et de masquage de données de signe amélioré
PCT/CN2015/082833 2015-06-23 2015-06-30 Groupage de segments de dérivation et masquage de données de signe amélioré pour le codage résiduel WO2017000222A1 (fr)

Priority Applications (9)

Application Number Priority Date Filing Date Title
PCT/CN2015/082833 WO2017000222A1 (fr) 2015-06-30 2015-06-30 Groupage de segments de dérivation et masquage de données de signe amélioré pour le codage résiduel
CN202011088607.1A CN112272298B (zh) 2015-06-23 2016-06-23 转换系数编解码的方法及装置
PCT/CN2016/086808 WO2016206590A1 (fr) 2015-06-23 2016-06-23 Procédé et appareil pour un codage de coefficient de transformation de blocs non carrés
CA2988451A CA2988451C (fr) 2015-06-23 2016-06-23 Procede et appareil pour un codage de coefficient de transformation de blocs non carres
CN201680036906.6A CN107710759B (zh) 2015-06-23 2016-06-23 转换系数编解码的方法及装置
EP18215487.2A EP3484149B1 (fr) 2015-06-23 2016-06-23 Procédé et appareil pour un codage de coefficient de transformation de blocs non carrés
US15/737,406 US10382768B2 (en) 2015-06-23 2016-06-23 Method and apparatus for transform coefficient coding of non-square blocks
EP16813706.5A EP3292690B1 (fr) 2015-06-23 2016-06-23 Procédé et appareil pour un codage de coefficient de transformation de blocs non carrés
US16/171,475 US10582203B2 (en) 2015-06-23 2018-10-26 Method and apparatus for transform coefficient coding of non-square blocks

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2015/082833 WO2017000222A1 (fr) 2015-06-30 2015-06-30 Groupage de segments de dérivation et masquage de données de signe amélioré pour le codage résiduel

Publications (1)

Publication Number Publication Date
WO2017000222A1 true WO2017000222A1 (fr) 2017-01-05

Family

ID=57607487

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2015/082833 WO2017000222A1 (fr) 2015-06-23 2015-06-30 Groupage de segments de dérivation et masquage de données de signe amélioré pour le codage résiduel

Country Status (1)

Country Link
WO (1) WO2017000222A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130272424A1 (en) * 2012-04-16 2013-10-17 Qualcomm Incorporated Sign hiding techniques for quantized transform coefficients in video coding
US20140307800A1 (en) * 2013-04-12 2014-10-16 Qualcomm Incorporated Rice parameter update for coefficient level coding in video coding process
CN104221288A (zh) * 2012-04-13 2014-12-17 佳能株式会社 对编码视频数据的变换单位的子集编码和解码的方法、设备和系统

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104221288A (zh) * 2012-04-13 2014-12-17 佳能株式会社 对编码视频数据的变换单位的子集编码和解码的方法、设备和系统
US20130272424A1 (en) * 2012-04-16 2013-10-17 Qualcomm Incorporated Sign hiding techniques for quantized transform coefficients in video coding
US20140307800A1 (en) * 2013-04-12 2014-10-16 Qualcomm Incorporated Rice parameter update for coefficient level coding in video coding process

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
JOEL SOLE ET AL.: "Transform Coefficient Coding in HEVC", IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS FOR VIDEO TECHNOLOGY, vol. 22, no. 12, 31 December 2012 (2012-12-31), pages 1767, 1772, XP011487805 *
VIVIENNE SZE ET AL.: "Parallel Context Processing of Coefficient Level", JOINT COLLABORATIVE TEAM ON VIDEO CODING (JCT-VC) OF ITU-T SG 16 WP3 AND ISO/IEC JTC1 SC29/WG11 6TH MEETING, 22 July 2011 (2011-07-22), Torino, XP030009153 *

Similar Documents

Publication Publication Date Title
JP7227283B2 (ja) 変換係数符号化
WO2017041271A1 (fr) Modélisation de contexte efficace pour le codage d'un bloc de données
US8068043B2 (en) Method and apparatus for video processing in context-adaptive binary arithmetic coding
JP5944510B2 (ja) 構文要素のコンテキスト−適応バイナリ算術符号化（Ｃｏｎｔｅｘｔ−ＡｄａｐｔｉｖｅＢｉｎａｒｙＡｒｉｔｈｍｅｔｉｃＣｏｄｉｎｇ）の方法と装置
KR20170135940A (ko) 비디오 코딩에서의 팔레트 모드 콘텍스트 코딩 및 이진화를 위한 방법
WO2012139192A2 (fr) Procédés et dispositifs de codage et de décodage de la position du dernier coefficient significatif
AU2016200045B2 (en) Method for coding video quantization parameter and method for decoding video quantization parameter
WO2016205999A1 (fr) Groupe de codage adaptatif pour codage d'image/de vidéo
US10085025B2 (en) Image quantization parameter encoding method and image quantization parameter decoding method
WO2017000222A1 (fr) Groupage de segments de dérivation et masquage de données de signe amélioré pour le codage résiduel
AU2015252148B2 (en) Image quantization parameter encoding method and image quantization parameter decoding method
WO2013155663A1 (fr) Procédés et appareils de réduction de contexte pour le codage d'indicateurs d'importance

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 15896753

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 15896753

Country of ref document: EP

Kind code of ref document: A1