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1. WO2020071879 - TRANSFORM COEFFICIENT CODING METHOD AND DEVICE THEREFOR

Publication Number WO/2020/071879
Publication Date 09.04.2020
International Application No. PCT/KR2019/013100
International Filing Date 07.10.2019
IPC
H04N 19/60 2014.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
19Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
60using transform coding
H04N 19/91 2014.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
19Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
90using coding techniques not provided for in groups H04N19/10-H04N19/85103
91Entropy coding, e.g. variable length coding or arithmetic coding
H04N 19/124 2014.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
19Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
10using adaptive coding
102characterised by the element, parameter or selection affected or controlled by the adaptive coding
124Quantisation
H04N 19/70 2014.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
19Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
70characterised by syntax aspects related to video coding, e.g. related to compression standards
H04N 19/132 2014.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
19Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
10using adaptive coding
102characterised by the element, parameter or selection affected or controlled by the adaptive coding
132Sampling, masking or truncation of coding units, e.g. adaptive resampling, frame skipping, frame interpolation or high-frequency transform coefficient masking
H04N 19/176 2014.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
19Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
10using adaptive coding
169characterised 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
17the unit being an image region, e.g. an object
176the region being a block, e.g. a macroblock
CPC
H04N 19/124
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
19Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
10using adaptive coding
102characterised by the element, parameter or selection affected or controlled by the adaptive coding
124Quantisation
H04N 19/132
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
19Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
10using adaptive coding
102characterised by the element, parameter or selection affected or controlled by the adaptive coding
132Sampling, masking or truncation of coding units, e.g. adaptive resampling, frame skipping, frame interpolation or high-frequency transform coefficient masking
H04N 19/176
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
19Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
10using adaptive coding
169characterised 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
17the unit being an image region, e.g. an object
176the region being a block, e.g. a macroblock
H04N 19/18
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
19Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
10using adaptive coding
169characterised 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
18the unit being a set of transform coefficients
H04N 19/60
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
19Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
60using transform coding
H04N 19/70
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
19Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
70characterised by syntax aspects related to video coding, e.g. related to compression standards
Applicants
  • 엘지전자 주식회사 LG ELECTRONICS INC. [KR]/[KR]
Inventors
  • 유선미 YOO, Sunmi
  • 김승환 KIM, Seunghwan
  • 최정아 CHOI, Jungah
  • 최장원 CHOI, Jangwon
  • 허진 HEO, Jin
Agents
  • 인비전 특허법인 ENVISION PATENT & LAW FIRM
Priority Data
62/741,61205.10.2018US
Publication Language Korean (KO)
Filing Language Korean (KO)
Designated States
Title
(EN) TRANSFORM COEFFICIENT CODING METHOD AND DEVICE THEREFOR
(FR) PROCÉDÉ DE CODAGE DE COEFFICIENT DE TRANSFORMÉE ET DISPOSITIF ASSOCIÉ
(KO) 변환 계수 코딩 방법 및 그 장치
Abstract
(EN)
An image decoding method performed by a decoding device according to the present document comprises a step of receiving a bitstream containing residual information, and a step of deriving a quantized transform coefficient for a current block on the basis of the residual information contained in the bitstream, wherein the residual information includes a context syntax element coded on the basis of the context, and if the size of a transformation block is changed as much as a sub-block region having a predetermined size and the current block is the last sub-block in the sub-block region and the last quantized transform coefficient is in the current block, then the step of deriving a quantized transform coefficient includes context-based decoding of the context syntax element on the basis of a predetermined maximum value for the context syntax element, wherein the maximum value is determined on the basis of the size of the sub-block region.
(FR)
La présente invention concerne un procédé de décodage d'image mis en oeuvre par un dispositif de décodage qui comprend une étape de réception d'un train de bits contenant des informations résiduelles, et une étape de dérivation d'un coefficient de transformée quantifié pour un bloc courant sur la base des informations résiduelles contenues dans le train de bits, les informations résiduelles comprenant un élément de syntaxe de contexte codé sur la base du contexte, et si la taille d'un bloc de transformation est modifiée autant qu'une région de sous-bloc présentant une taille prédéterminée et que le bloc courant est le dernier sous-bloc dans la région de sous-bloc et que le dernier coefficient de transformée quantifié se trouve dans le bloc courant, puis l'étape de dérivation d'un coefficient de transformée quantifié qui comprend le décodage basé sur le contexte de l'élément de syntaxe de contexte sur la base d'une valeur maximale prédéterminée pour l'élément de syntaxe de contexte, la valeur maximale étant déterminée sur la base de la taille de la région de sous-bloc.
(KO)
본 문서에 따른 디코딩 장치에 의하여 수행되는 영상 디코딩 방법은, 레지듀얼 정보를 포함하는 비트스트림을 수신하는 단계, 상기 비트스트림에 포함된 상기 레지듀얼 정보를 기반으로 현재 블록에 대한 양자화된 변환 계수를 도출하는 단계를 포함하고, 상기 레지듀얼 정보는 컨텍스트 기반으로 코딩된 컨텍스트 구문요소를 포함하고, 변환 블록의 크기가 기설정된 크기의 서브 블록 영역으로 변경되고, 상기 현재 블록이 상기 서브 블록 영역 내 마지막 서브 블록이고, 상기 현재 블록에 마지막 양자화된 변환 계수가 존재하는 경우, 상기 양자화된 변환 계수를 도출하는 단계는, 상기 컨텍스트 구문요소에 대한 기설정된 최대치에 기초하여 상기 컨텍스트 구문요소를 컨텍스트 기반으로 디코딩하고, 상기 최대치는 상기 서브 블록 영역의 크기에 기초하여 결정되는 특징으로 한다.
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