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1. WO2020197083 - METHOD AND DEVICE FOR INTER PREDICTION ON BASIS OF DMVR AND BDOF

Publication Number WO/2020/197083
Publication Date 01.10.2020
International Application No. PCT/KR2020/001862
International Filing Date 11.02.2020
IPC
H04N 19/577 2014.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
19Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
50using predictive coding
503involving temporal prediction
51Motion estimation or motion compensation
577Motion compensation with bidirectional frame interpolation, i.e. using B-pictures
H04N 19/513 2014.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
19Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
50using predictive coding
503involving temporal prediction
51Motion estimation or motion compensation
513Processing of motion vectors
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 19/70 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 19/176 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
H04N 19/186 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
186the unit being a colour or a chrominance component
CPC
H04N 19/105
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
103Selection of coding mode or of prediction mode
105Selection of the reference unit for prediction within a chosen coding or prediction mode, e.g. adaptive choice of position and number of pixels used for prediction
H04N 19/157
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
19Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
10using adaptive coding
134characterised by the element, parameter or criterion affecting or controlling the adaptive coding
157Assigned coding mode, i.e. the coding mode being predefined or preselected to be further used for selection of another element or parameter
H04N 19/159
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
19Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
10using adaptive coding
134characterised by the element, parameter or criterion affecting or controlling the adaptive coding
157Assigned coding mode, i.e. the coding mode being predefined or preselected to be further used for selection of another element or parameter
159Prediction type, e.g. intra-frame, inter-frame or bidirectional frame prediction
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 19/513
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
19Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
50using predictive coding
503involving temporal prediction
51Motion estimation or motion compensation
513Processing of motion vectors
H04N 19/577
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
19Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
50using predictive coding
503involving temporal prediction
51Motion estimation or motion compensation
577Motion compensation with bidirectional frame interpolation, i.e. using B-pictures
Applicants
  • 엘지전자 주식회사 LG ELECTRONICS INC. [KR]/[KR]
Inventors
  • 박내리 PARK, Naeri
  • 남정학 NAM, Junghak
  • 장형문 JANG, Hyeongmoon
Agents
  • 인비전 특허법인 ENVISION PATENT & LAW FIRM
Priority Data
62/822,72422.03.2019US
Publication Language Korean (KO)
Filing Language Korean (KO)
Designated States
Title
(EN) METHOD AND DEVICE FOR INTER PREDICTION ON BASIS OF DMVR AND BDOF
(FR) PROCÉDÉ ET DISPOSITIF D'INTERPRÉDICTION BASÉE SUR LE DMVR ET LE BDOF
(KO) DMVR 및 BDOF 기반의 인터 예측 방법 및 장치
Abstract
(EN)
An image decoding method according to the present document comprises: deriving L0 and L1 motion vectors of a current block; deriving refined L0 and L1 motion vectors by applying decoder-side motion vector refinement (DMVR) to the current block on the basis of DMVR flag information indicating whether to apply the DMVR to the current block; deriving L0 prediction samples of the current block on the basis of the refined L0 motion vector, and L1 prediction samples of the current block on the basis of the refined L1 motion vector; deriving prediction samples of the current block on the basis of the L0 and L1 prediction samples by applying a bi-directional optical flow (BDOF) to the current block on the basis of BDOF flag information indicating whether to apply the BDOF to the current block; and generating restoration samples of the current block on the basis of the prediction samples, wherein the DMVR flag information is induced on the basis of a preset DMVR application condition, and the BDOF flag information is induced on the basis of a preset BDOF application condition.
(FR)
Un procédé de décodage d'image selon la présente invention consiste à : dériver des vecteurs de mouvement L0 et L1 d'un bloc actuel ; dériver des vecteurs de mouvement L0 et L1 affinés en appliquant un affinement de vecteur de mouvement de côté décodeur (DMVR) au bloc actuel en fonction d'informations de drapeau de DMVR indiquant s'il faut appliquer le DMVR au bloc actuel ; dériver des échantillons de prédiction de L0 du bloc actuel en fonction du vecteur de mouvement L0 affiné, et des échantillons de prédiction de L1 du bloc actuel en fonction du vecteur de mouvement L1 affiné ; dériver des échantillons de prédiction du bloc actuel en fonction des échantillons de prédiction de L0 et de L1 en appliquant un flux optique bidirectionnel (BDOF) au bloc actuel en fonction d'informations de drapeau de BDOF indiquant s'il faut appliquer le BDOF au bloc actuel ; et produire des échantillons de restauration du bloc actuel en fonction des échantillons de prédiction, les informations de drapeau de DMVR étant induites en fonction d'une condition d'application de DMVR prédéfinie, et les informations de drapeau de BDOF étant induites en fonction d'une condition d'application de BDOF prédéfinie.
(KO)
본 문서에 따른 영상 디코딩 방법은 현재 블록의 L0 및 L1 움직임 벡터를 도출하고, 현재 블록에 대해 DMVR(Decoder-side Motion Vector Refinement)을 적용할지 여부를 나타내는 DMVR 플래그 정보를 기반으로 현재 블록에 대해 DMVR을 적용하여 리파인된 L0 및 L1 움직임 벡터를 도출하고, 리파인된 L0 움직임 벡터를 기반으로 현재 블록의 L0 예측 샘플들 및 리파인된 L1 움직임 벡터를 기반으로 현재 블록의 L1 예측 샘플들을 도출하고, 현재 블록에 대해 BDOF(Bi-directional optical flow)를 적용할지 여부를 나타내는 BDOF 플래그 정보를 기반으로 현재 블록에 대해 BDOF를 적용하여 L0 및 L1 예측 샘플들을 기반으로 현재 블록의 예측 샘플들을 도출하고, 예측 샘플들을 기반으로 현재 블록의 복원 샘플들을 생성하며, DMVR 플래그 정보는 기설정된 DMVR 적용 조건을 기반으로 유도되며, BDOF 플래그 정보는 기설정된 BDOF 적용 조건을 기반으로 유도되는 것을 특징으로 한다.
Also published as
EP2020720894
EP20720894.3
KRKR1020207012296
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