METHOD AND DEVICE FOR CONTEXT-ADAPTIVE BINARY ARITHMETIC CODING OR DECODING A SEQUENCE OF BINARY SYMBOLS REPRESENTING A SYNTAX ELEMENT RELATED TO VIDEO DATA

摘要

The present principles relate to a method and device for context-adaptive binary arithmetic coding a sequence of binary symbols representing a syntax element related to video data or a syntax element relative to a video data. The method comprises, for each bin of the sequence of binary symbols: - obtaining (100) a context value from a context defined for the binary symbol, said context value comprising bits representing the probability, called a first probability p, for the binary symbol to be equal to a binary value; - determining (110) a second probability p' by modifying said first probability p according to some information data representative of previously coded image data; - arithmetic coding (120) the binary symbol based on said second probability p'; and - updating (130) the first probability p of said context value according to the coded binary symbol.