Predictive coding method and decoding method for dynamic image

Details Predictive coding method and decoding method for dynamic image Predictive coding method and decoding method for dynamic image

H - Electricity

04

N

H04N 7/32 (2006.01) G06T 9/00 (2006.01) H04N 7/26 (2006.01) H04N 7/36 (2006.01)

Patent

CA 2279923

A predictive coding method for a dynamic image having two types of prediction modes of global motion compensation and local motion compensation, wherein an unnecessary code word MCSEL is reduced as much as possible, even by one bit, thus improving the compression efficiency. A coder outputs a code word MCBPC indicating presence/absence of DCT coefficients of a macroblock type and two color-difference signal blocks. After that, only when the block is not an infra-frame coded block, a coder outputs a code word MCSEL indicating whether the current macroblock is predicted by global motion compensation or predicted by local motion compensation.

L'invention concerne un procédé de codage prédictif pour image dynamique, pouvant être mise en oeuvre selon deux types de mode de prévision: compensation de mouvement globale et compensation de mouvement locale. Selon ledit procédé, un mot de code MCSEL non nécessaire est réduit autant que possible, même d'un bit, ce qui améliore l'efficacité de compression. Un codeur émet un mot de code MCBPC indiquant la présence ou l'absence de coefficient DCT d'un type de macrobloc et deux blocs de signal de différence de couleur. Ensuite, seulement lorsque le bloc n'est pas un bloc codé intratrame, un codeur émet un mot de code MCSEL indiquant si le macrobloc actuel est prédit par compensation de mouvement globale ou par compensation de mouvement locale.

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