Compression/decompression method for image data

H - Electricity – 04 – N

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H04N 7/12 (2006.01) H04N 7/26 (2006.01) H04N 7/30 (2006.01) H04N 7/54 (2006.01)

Patent

CA 2126307

A compression/decompression method for image data allows addition of a code amount control amount in units of data of one block without necessitating an excessive header capacity. In compression, a quantization conversion coefficient of a quantization conversion coefficient set is replaced with a code amount control amount, and a resulted quantization conversion coefficient set is coded, whereafter a quantization coefficient of a quantization coefficient set corresponding to the code amount control amount of the quantization conversion coefficient set is changed to 0. In decompression, the quantization coefficient set is extracted, and coded data are decoded in units of data of one block. Then, the code amount control amount is extracted from the quantization conversion coefficient set of the decoded data.

L'invention a trait à une méthode de compression/décompression de données d'imagerie qui permet d'ajouter une valeur code valeur contrôle dans les unités de données d'un bloc sans faire appel à une capacité d'en-tête excessive. Au cours du processus de compression, le coefficient de conversion de la quantification d'un ensemble de coefficient de conversion de quantification est remplacé par une valeur code valeur contrôle et l'ensemble de coefficient de conversion de quantification obtenu est codé, puis un coefficient de quantification d'un ensemble de coefficient de quantification correspondant à la valeur code valeur contrôle de l'ensemble de coefficient de conversion de quantification est remplacé par 0. Au cours du processus de décompression, il faut extraire l'ensemble de coefficient de quantification et les données codées sont décodées en unités de données d'un bloc. Ensuite la valeur code valeur contrôle est extraite de l'ensemble de coefficient de quantification des données décodées.

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