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1. WO2020198497 - METHODS AND APPARATUS FOR PREDICTION REFINEMENT FOR DECODER SIDE MOTION VECTOR REFINEMENT WITH OPTICAL FLOW

Publication Number WO/2020/198497
Publication Date 01.10.2020
International Application No. PCT/US2020/024996
International Filing Date 26.03.2020
IPC
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 19/44 2014.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
19Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
44Decoders specially adapted therefor, e.g. video decoders which are asymmetric with respect to the encoder
H04N 19/136 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
134characterised by the element, parameter or criterion affecting or controlling the adaptive coding
136Incoming video signal characteristics or properties
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 19/109 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
109among a plurality of temporal predictive coding modes
CPC
H04N 19/109
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
109among a plurality of temporal predictive coding modes
H04N 19/136
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
136Incoming video signal characteristics or properties
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 19/44
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
19Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
44Decoders specially adapted therefor, e.g. video decoders which are asymmetric with respect to the encoder
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
Applicants
  • VID SCALE, INC. [US]/[US]
Inventors
  • CHEN, Wei
  • HE, Yuwen
  • LUO, Jiancong
Agents
  • SHAH, Quasim
Priority Data
62/823,93526.03.2019US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) METHODS AND APPARATUS FOR PREDICTION REFINEMENT FOR DECODER SIDE MOTION VECTOR REFINEMENT WITH OPTICAL FLOW
(FR) PROCÉDÉS ET APPAREILS D'AFFINEMENT DE PRÉDICTION SERVANT À UN AFFINEMENT DE VECTEUR DE MOUVEMENT CÔTÉ DÉCODEUR AVEC UN FLUX OPTIQUE
Abstract
(EN)
Methods, devices, apparatus, systems, architectures and interfaces to improve motion vector (MV) refinement based sub-block (SB) level motion compensated prediction are provided. A decoding method includes receiving a bitstream of encoded video data, the bitstream including at least one block of video data including a plurality of SBs; performing a MV derivation, including a decoder based MV (DMVR) process, for at least one SB in the block to generate a refined MV for each SB; performing SB based motion compensation on the at least one sub-block to generate a SB based prediction within each SB; obtaining a spatial gradient for the prediction within each SB; determining a MV offset for each pixel in each SB; obtaining an intensity change in each SB based on the spatial gradients and MV offsets via an optical flow equation; and refining the prediction within each SB based on the obtained intensity changes.
(FR)
L'invention concerne des procédés, des dispositifs, des appareils, des systèmes, des architectures et des interfaces permettant d'améliorer une prédiction compensée par mouvement de sous-bloc (SB) basée sur un affinement de vecteur de mouvement (MV). Un procédé de décodage comprend la réception d'un flux binaire de données vidéo codées, le flux binaire comprenant au moins un bloc de données vidéo comprenant une pluralité de SBs; la réalisation d'une dérivation MV, comprenant un processus MV basé sur un décodeur (DMVR), pour au moins une SB dans le bloc pour générer un MV affiné pour chaque SB; la réalisation d'une compensation de mouvement basée sur le SB sur l'au moins un sous-bloc afin de générer une prédiction basée sur le SB à l'intérieur de chaque SB; l'obtention d'un gradient spatial pour la prédiction à l'intérieur de chaque SB; la détermination d'un décalage MV pour chaque pixel dans chaque SB; l'obtention d'un changement d'intensité dans chaque SB sur la base des gradients spatiaux et des décalages MV par l'intermédiaire d'une équation de flux optique; et l'affinage de la prédiction à l'intérieur de chaque SB sur la base des changements d'intensité obtenus.
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