Variable length coding method and variable length decoding...

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H03M 7/40 (2006.01) G06T 9/00 (2006.01) G11B 20/14 (2006.01) H03M 5/14 (2006.01) H03M 7/46 (2006.01) H04N 7/26 (2006.01) H04N 7/30 (2006.01) H04N 7/50 (2006.01)

Patent

CA 2467266

An image coding apparatus (103) for coding a quantization coefficient of an image signal as data to be processed includes a run length coder (RLE2) for assigning a variable length code to the quantization coefficient by using a coding table. According to a first code table, the run length coder (RLE2) creates a second code table optimized for the data to be processed. According to a quantization parameter (QP) or a variable length coding selection signal (VlcSel), the first or the second code table is selected as a code table to be used for assigning the variable length code. Thus, it is possible to effectively remove the information redundancy present in the data to be processed and to improve the compression ratio of an image signal.

L'invention concerne un appareil (103) de codage d'image permettant de coder un coefficient de quantification d'un signal d'image en tant que données à traiter, comprenant un codeur de longueur de plage (RLE2) permettant d'attribuer un code de longueur variable à un coefficient de quantification, au moyen d'un tableau de codage. Selon un premier tableau de codage, le codeur de longueur de plage (RLE2) permet de créer un second tableau de codage optimisé pour les données à traiter. Selon un paramètre de quantification (QP) ou un signal de sélection de codage de longueur variable (VlcSel), le premier tableau de codage ou le second tableau de codage est sélectionné en tant que tableau de codage à utiliser pour l'attribution du code de longueur variable. Ainsi, il est possible de retirer de manière efficace la redondance d'information présente dans les données à traiter et d'améliorer le taux de compression d'un signal d'image.

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