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1. WO2018136128 - DC COEFFICIENT SIGN CODING SCHEME

Publication Number WO/2018/136128
Publication Date 26.07.2018
International Application No. PCT/US2017/059241
International Filing Date 31.10.2017
Chapter 2 Demand Filed 09.05.2018
IPC
H04N 19/13 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
13Adaptive entropy coding, e.g. adaptive variable length coding or context adaptive binary arithmetic 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 19/18 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
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 19/13
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
13Adaptive entropy coding, e.g. adaptive variable length coding [AVLC] or context adaptive binary arithmetic coding [CABAC]
H04N 19/167
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
167Position within a video image, e.g. region of interest [ROI]
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 19/91
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
  • GOOGLE LLC [US]/[US]
Inventors
  • XU, Yaowu
  • HAN, Jingning
  • CHIANG, Ching-Han
Agents
  • BASILE, Jr., Andrew R.
  • KNIGHT, Michelle L.
  • OPENSHAW & CO
Priority Data
15/409,86219.01.2017US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) DC COEFFICIENT SIGN CODING SCHEME
(FR) SCHÉMA DE CODAGE DE SIGNE DE COEFFICIENT DC
Abstract
(EN)
A sign value of a DC coefficient of a current block is determined using neighbor blocks of the current block. First and second sign values are identified as respectively corresponding to an above neighbor block of the current block and a left neighbor block of the current block. A context value is calculated by applying a first weighting value to the first sign value and a second weighting value to the second sign value. The first weighting value is based on a boundary between the above neighbor block and the current block, and the second weighting value is based on a boundary between the left neighbor block and the current block. A probability value is selected based on the context value. The sign value of the DC coefficient of the current block is then determined using the probability model.
(FR)
Une valeur de signe d'un coefficient DC d'un bloc courant est déterminée à l'aide de blocs voisins du bloc courant. Des première et seconde valeurs de signe sont identifiées comme correspondant respectivement à un bloc voisin supérieur du bloc courant et à un bloc voisin gauche du bloc courant. Une valeur de contexte est calculée en appliquant une première valeur de pondération à la première valeur de signe et une seconde valeur de pondération à la seconde valeur de signe. La première valeur de pondération est basée sur une limite entre le bloc voisin supérieur et le bloc courant, et la seconde valeur de pondération est basée sur une limite entre le bloc voisin gauche et le bloc courant. Une valeur de probabilité est sélectionnée sur la base de la valeur de contexte. La valeur de signe du coefficient DC du bloc courant est ensuite déterminée à l'aide du modèle de probabilité.
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