CODING DEVICE AND METHOD, RECORDING MEDIUM, AND PROGRAM

摘要

PROBLEM TO BE SOLVED: To realize field/frame coding at a macroblock level using a CABAC system even when input image information is in an interlaced scanning format.SOLUTION: A coding device for coding image information comprises: context model means that when an adjacent macroblock adjacent to a target macroblock to be coded is coded in a field mode and the target macroblock is coded in a frame mode, a motion vector prediction error of the adjacent macroblock is converted to be adapted to the frame mode of the target macroblock to calculate a context model corresponding to a motion vector prediction error of the target macroblock; and context-adaptive arithmetic coding means that performs context-adaptive arithmetic coding on the image information using the context model calculated by the context model means.