Method and device for context adaptive binary arithmetic coding of a sequence of binary symbols representing a syntax element associated with picture data

摘要

The present principles are related to a method and a device for context adaptive binary arithmetic coding / decoding of a sequence of binary symbols representing a syntax element associated with picture data pertaining to a picture block. The method comprising: for each binary symbol of a sequence of binary symbols: determining (110) a context according to the size of the picture block and the binary symbol to be coded; And - arithmetic coding / decoding (120) said binary symbols in consideration of said determined context; Determining (110) the context comprises: determining (910) a context according to the size of the picture block when the size of the picture block is a power of two; And determining a context according to a block size immediately above or below a size of the picture block, the block size being equal to a power of 2, when the size of the picture block is not a power of two (920).