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1. WO2020060867 - SCALAR QUANTIZER DECISION SCHEME FOR DEPENDENT SCALAR QUANTIZATION

Publication Number WO/2020/060867
Publication Date 26.03.2020
International Application No. PCT/US2019/051089
International Filing Date 13.09.2019
IPC
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 19/136 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 19/18 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
18the unit being a set of transform coefficients
H04N 19/192 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
189characterised by the adaptation method, adaptation tool or adaptation type used for the adaptive coding
192the adaptation method, adaptation tool or adaptation type being iterative or recursive
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
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 19/136
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 19/18
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 19/192
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
19Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
10using adaptive coding
189characterised by the adaptation method, adaptation tool or adaptation type used for the adaptive coding
192the adaptation method, adaptation tool or adaptation type being iterative or recursive
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 19/91
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-H04N19/85, e.g. fractals
91Entropy coding, e.g. variable length coding [VLC] or arithmetic coding
Applicants
  • INTERDIGITAL VC HOLDINGS, INC. [US]/[US]
Inventors
  • CHEN, Ya
  • LELEANNEC, Fabrice
  • POIRIER, Tangi
  • DE LAGRANGE, Philippe
Agents
  • DORINI, Brian J.
  • LU, Xiaoan
  • SHEDD, Robert D.
Priority Data
18290103.321.09.2018EP
19305641.320.05.2019EP
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) SCALAR QUANTIZER DECISION SCHEME FOR DEPENDENT SCALAR QUANTIZATION
(FR) PROCÉDÉ DE DÉCISION DE QUANTIFICATEUR SCALAIRE POUR QUANTIFICATION SCALAIRE DÉPENDANTE
Abstract
(EN)
When dependent scalar quantization is used, the choice of the quantizer depends on the decoding of the preceding transform coefficient, and the entropy decoding of a transform coefficient depends on quantizer choice. To maintain high throughput in hardware implementations for transform coefficient entropy coding, several decision schemes of the scaler quantizer are proposed. In one implementation, the state transition and the context model selection are based on only regular coded bins. For example, the state transition can be based on the sum of the SIG, gt1 and gt2 flags, the exclusive-or function of the SIG, gt1 and gt2 flags, or based on only the gt1 or gt2 flag. When a block of transform coefficients is coded, the regular mode bins can be coded first in one or more scan passes, and the remaining bypass coded bins are grouped together in another one or more scan passes.
(FR)
Selon la présente invention, lorsque la quantification scalaire dépendante est utilisée, le choix du quantificateur dépend du décodage du coefficient de transformation précédent, et le décodage entropique d'un coefficient de transformation dépend du choix du quantificateur. Afin de maintenir un rendement élevé dans des mises en œuvre matérielles correspond à un codage entropique de coefficient de transformation, plusieurs procédés de décision du quantificateur scalaire sont proposés. Dans un mode de réalisation, la transition d'état et la sélection de modèle de contexte sont basées sur uniquement des segments codés réguliers. Par exemple, la transition d'état peut être basée sur la somme du SIG, des drapeaux gt1 et gt2, de la fonction ou de la fonction exclusive du SIG, des drapeaux gt1 et gt2, ou sur la base uniquement du drapeau gt1 ou gt2. Lorsqu'un bloc de coefficients de transformation est codé, les segments de mode régulier peuvent être codés d'abord dans un ou plusieurs passages de balayage, et les segments codés de dérivation restants sont groupés ensemble dans un autre ou plusieurs passages de balayage.
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