Effective color modeling method for predictive image...

G - Physics – 06 – T

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G06T 9/00 (2006.01) H04N 11/02 (2006.01)

Patent

CA 2754753

A method for effective color modeling for predictive image encoding. Colors are processed on a binary basis, when each color index is treated as a binary value. Binary digits are processed sequentially with the use of context-based approach. The context is calculated as a unique combination of binary values of already processed digits, the position of the digit currently being processed and an additional identifier from a limited set of identifiers that describe differences between the predicted color index and the averaged color index being reconstructed during bitwise processing. Color mapping, table operations and a special rules for efficient difference identification are proposed as major enhancements of the method.

La présente invention concerne un procédé de modélisation de couleur efficace permettant un codage d'image prédictif. Des couleurs sont traitées sur une base binaire, lorsque chaque indice de couleur est traité en tant que valeur binaire. Des chiffres binaires sont traités de façon séquentielle grâce à l'utilisation d'une approche contextuelle. Le contexte est calculé comme une combinaison unique de valeurs binaires de chiffres déjà traités, la position du chiffre étant en cours de traitement et un identifiant supplémentaire issu d'un ensemble limité d'identifiants qui décrivent des différences entre l'indice de couleur prédit et l'indice de couleur moyen étant reconstruit pendant le traitement binaire. Un mappage des couleurs, des opérations de table et des règles spéciales permettant une identification efficace des différences constituent des améliorations majeures du procédé.

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