ENCODING APPARATUS AND METHOD, DECODING APPARATUS AND METHOD, RECORDING MEDIUM, AND PROGRAM

摘要

PROBLEM TO BE SOLVED: To realize field/frame encoding at a macro block level using the CABAC (context-based adaptive binary arithmetic coding) system even when received image information is of an interlaced scanning format.

SOLUTION: A frame/field flag context model 91 in an arithmetic encoding section 58 encodes first a frame/field flag among syntax elements of received image compression information. When a macro block being a processing object is subjected to frame base encoding, a context model 92 of a frame base specified at present in the H.26 L standard is used. On the other hand, when the macro block being the processing object is subjected to field encoding, a field- based context model 94 is applied to the syntax elements. This invention is applicable to an image information encoding apparatus and an image information decoding apparatus.

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