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1. WO2002103615 - METHOD AND SYSTEM FOR ACHIEVING CODING GAINS IN WAVELET-BASED IMAGE CODECS

Publication Number WO/2002/103615
Publication Date 27.12.2002
International Application No. PCT/IB2002/002092
International Filing Date 07.06.2002
Chapter 2 Demand Filed 31.12.2002
IPC
G06T 9/00 2006.1
GPHYSICS
06COMPUTING; CALCULATING OR COUNTING
TIMAGE DATA PROCESSING OR GENERATION, IN GENERAL
9Image coding
H04N 7/26 2006.1
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
CPC
H04N 1/387
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
1Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
387Composing, repositioning or otherwise ; geometrically; modifying originals
H04N 19/10
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
19Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
10using adaptive coding
H04N 19/186
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
186the unit being a colour or a chrominance component
H04N 19/63
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
19Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
60using transform coding
63using sub-band based transform, e.g. wavelets
Applicants
  • NOKIA CORPORATION [FI]/[FI]
  • NOKIA INC. [US]/[US] (LC)
Inventors
  • ISLAM, Asad
  • CHEBIL, Fehmi
Agents
  • MAGUIRE, Francis, J.
Priority Data
09/883,10515.06.2001US
Publication Language English (en)
Filing Language English (EN)
Designated States
Title
(EN) METHOD AND SYSTEM FOR ACHIEVING CODING GAINS IN WAVELET-BASED IMAGE CODECS
(FR) PROCEDE ET SYSTEME PERMETTANT D'OBTENIR DES GAINS DE CODAGE DANS DES CODEURS-DECODEURS D'IMAGES A BASE D'ONDELETTES
Abstract
(EN) A method and system for coding and decoding RGB image. The RGB image component are converted into YUV components (10). One or more of the lower bit planes are eliminated (20). YUV components are transformed by forward wavelet (30). The codestream is decoded and transformed by inverse wavelet transform wavelet transform into YUV component (160). The bit-planes of YUV components are up-shifted (70). The up-shifted YUV are then converted into RGB component (80).
(FR) Cette invention concerne un procédé et un système de codage et de décodage d'une image RVB. Les composants de l'image RVB sont convertis en composantes YUV (10). Une ou plusieurs des tables de bits inférieures sont supprimées (20). Les composantes YUV sont transformées par une transformée en ondelettes directe (30). Le flux de codes est décodé et transformé par transformée en ondelettes inverse en un ensemble (160) de composantes YUV. Les trains de bits de ces composantes YUV sont décalés vers le haut (70). Les composantes YUV décalées vers le haut sont ensuite converties en composants RVB (80).
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