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1. WO2020197084 - DMVR-BASED INTER PREDICTION METHOD AND APPARATUS

Publication Number WO/2020/197084
Publication Date 01.10.2020
International Application No. PCT/KR2020/001863
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 19/11 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
103Selection of coding mode or of prediction mode
11among a plurality of spatial predictive coding modes
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
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
62/822,72922.03.2019US
Publication Language Korean (KO)
Filing Language Korean (KO)
Designated States
Title
(EN) DMVR-BASED INTER PREDICTION METHOD AND APPARATUS
(FR) PROCÉDÉ ET APPAREIL D'INTER-PRÉDICTION SUR LA BASE D'UN DMVR
(KO) DMVR 기반의 인터 예측 방법 및 장치
Abstract
(EN)
A video decoding method according to the present document comprises the steps of: deriving L0 and L1 motion vectors of a current block; deriving decoder-side motion vector refinement (DMVR) flag information indicating whether to apply a DMVR to the current block; when the DMVR flag information indicates that the DMVR is to be applied to the current block, deriving refined L0 and L1 motion vectors on the basis of the L0 and L1 motion vectors by applying the DMVR to the current block; deriving prediction samples of the current block on the basis of the refined L0 and L1 motion vectors; and generating reconstructed samples of the current block on the basis of the predicted samples, wherein the step of deriving DMVR flag information comprises deriving the DMVR flag information by applying the DMVR to the current block when the height of the current block is 8 or more, and when the values of L0 and L1 luma weighted prediction flag information are both 0.
(FR)
D'après la présente invention, un procédé de décodage vidéo comprend les étapes consistant à : dériver des vecteurs de mouvement L0 et L1 d'un bloc actuel ; dériver des informations d'indication d'affinement de vecteur de mouvement côté décodeur (DMVR) indiquant s'il faut appliquer un DMVR au bloc actuel ; lorsque les informations d'indication de DMVR indiquent que le DMVR doit être appliqué au bloc actuel, dériver des vecteurs de mouvement L0 et L1 affinés sur la base des vecteurs de mouvement L0 et L1 en appliquant le DMVR au bloc actuel ; dériver des échantillons de prédiction du bloc actuel sur la base des vecteurs de mouvement L0 et L1 affinés ; et générer des échantillons reconstruits du bloc actuel sur la base des échantillons prédits, l'étape de dérivation des informations d'indication de DMVR supposant de dériver les informations d'indication de DMVR en appliquant le DMVR au bloc actuel lorsque la hauteur du bloc actuel est supérieure ou égale à 8 et lorsque les valeurs des informations d'indication de prédiction pondérée de luminance L0 et L1 sont toutes deux égales à 0.
(KO)
본 문서에 따른 영상 디코딩 방법은 현재 블록의 L0 및 L1 움직임 벡터를 도출하는 단계, 현재 블록에 대해 DMVR(Decoder-side Motion Vector Refinement)을 적용할지 여부를 지시하는 DMVR 플래그 정보를 유도하는 단계, DMVR 플래그 정보가 현재 블록에 대해 DMVR을 적용하는 것으로 지시하는 경우, 현재 블록에 대해 DMVR을 적용하여 L0 및 L1 움직임 벡터를 기반으로 리파인된 L0 및 L1 움직임 벡터를 도출하는 단계, 리파인된 L0 및 L1 움직임 벡터를 기반으로 현재 블록의 예측 샘플들을 도출하는 단계, 예측 샘플들을 기반으로 현재 블록의 복원 샘플들을 생성하는 단계를 포함하며, DMVR 플래그 정보를 유도하는 단계는, 현재 블록의 높이(Height)가 8 이상인 경우와, L0 및 L1 루마 가중 예측 플래그 정보의 값이 모두 0인 경우, 현재 블록에 대해 DMVR을 적용하는 것으로 DMVR 플래그 정보를 유도하는 것을 특징으로 한다.
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