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1. WO2013001013 - METHOD FOR DECODING A SCALABLE VIDEO BIT-STREAM, AND CORRESPONDING DECODING DEVICE

Publication Number WO/2013/001013
Publication Date 03.01.2013
International Application No. PCT/EP2012/062586
International Filing Date 28.06.2012
IPC
H04N 7/26 2006.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
7Television systems
24Systems for the transmission of television signals using pulse code modulation
26using bandwidth reduction
H04N 7/50 2006.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
7Television systems
24Systems for the transmission of television signals using pulse code modulation
26using bandwidth reduction
50involving transform and predictive coding
CPC
H04N 19/126
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
126Details of normalisation or weighting functions, e.g. normalisation matrices or variable uniform quantisers
H04N 19/139
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
137Motion inside a coding unit, e.g. average field, frame or block difference
139Analysis of motion vectors, e.g. their magnitude, direction, variance or reliability
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 19/187
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
187the unit being a scalable video layer
H04N 19/33
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
19Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
30using hierarchical techniques, e.g. scalability
33in the spatial domain
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
Applicants
  • CANON KABUSHIKI KAISHA [JP]/[JP] (AllExceptUS)
  • LE LEANNEC, Fabrice [FR]/[FR] (UsOnly)
  • LASSERRE, Sébastien [FR]/[FR] (UsOnly)
Inventors
  • LE LEANNEC, Fabrice
  • LASSERRE, Sébastien
Agents
  • SANTARELLI
Priority Data
1111198.630.06.2011GB
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) METHOD FOR DECODING A SCALABLE VIDEO BIT-STREAM, AND CORRESPONDING DECODING DEVICE
(FR) PROCÉDÉ POUR DÉCODER UN TRAIN DE BITS VIDÉO EXTENSIBLE, ET DISPOSITIF DE DÉCODAGE CORRESPONDANT
Abstract
(EN)
The invention relates to video compression of scalable video (11). Where the base layer (14) is decoded using temporal prediction and the enhancement layer (20) has no temporal prediction, the decoding of the enhancement layer comprises: decoding (331), from the bit-stream EBS, and dequantizing (332) DCT coefficients formula (I) of the enhancement layer; using the motion information Ml of the base layer to predict (405) coefficients of the enhancement layer; and transforming the predicted coefficients into DCT predicted coefficients Y; using parameters α,β in the bit-stream to obtain a probabilistic distribution GGD(αii) of the DCT coefficients; obtaining a probabilistic distribution GGD(αnn) of the differences between the dequantized DCT coefficients formula (I) and the DCT predicted coefficients Y; and merging (38) these coefficients, based on the obtained probabilistic distributions. This improves the rate-distortion ratio of encoded scalable video.
(FR)
La présente invention se rapporte à la compression vidéo d'une vidéo extensible 11. Lorsque la couche de base 14 est décodée par prédiction temporelle et que la couche d'amélioration 20 n'a pas de prédiction temporelle, le décodage de la couche d'amélioration consiste : à décoder 331, à partir du train de bits EBS, et à déquantifier 332 une formule de coefficients DCT (I) de la couche d'amélioration ; à utiliser les données de mouvement Ml de la couche de base dans le but de prédire 405 des coefficients de la couche d'amélioration ; et à transformer les coefficients prédits en coefficients DCT prédits Y ; à utiliser des paramètres α,β du train de bits dans le but d'obtenir une distribution probabilistique GGD(αii) des coefficients DCT ; à obtenir une distribution probabilistique GGD(αnn) des différences entre la formule de coefficients DCT déquantifiée (I) et les coefficients DCT prédits Y ; et à fusionner 38 ces coefficients, sur la base des distributions probabilistiques obtenues. Il est possible, de cette manière, d'améliorer le rapport entre distorsion et rendement de la vidéo extensible codée.
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