Switching between dct coefficient coding modes

H - Electricity – 03 – M

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H03M 7/46 (2006.01) G06T 9/00 (2006.01) H03M 7/48 (2006.01) H04N 7/26 (2006.01)

Patent

CA 2745314

A system and method is provided for improving efficiency when entropy coding a block of quantized transform coefficients in video coding. Quantized coefficients are coded in two separate coding modes, namely, a run mode to a level mode coding mode. "Rules" for switching between these two modes are provided, and various embodiments are realized by 5 allowing an entropy coder to adaptively decide when to switch between the two coding modes based on context information, the rules and/ or by explicitly signaling the position of switching (e.g., whether or not it should switch coding modes).

L'invention porte sur un système et un procédé damélioration de  l'efficacité lors d'un codage entropique d'un bloc de coefficients de transformée quantifiés en codage vidéo. Des coefficients quantifiés sont codés en deux modes de codage séparés, à savoir un mode dexécution et un mode de niveau. Des « règles » pour commuter entre ces deux modes sont utilisées, et divers modes de réalisation sont consistent à permettre à un codeur entropique de décider de façon adaptative quand commuter entre les deux modes de codage sur la base d'informations de contexte, des règles et/ou par la signalisation explicite de la position de commutation (déterminant, par exemple, si ledit codeur doit commuter ou non entre les modes de codage).

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