IMAGE CODING METHOD, IMAGE DECODING METHOD, IMAGE CODER, IMAGE DECODER, IMAGE CODING PROGRAM, IMAGE DECODING PROGRAM AND RECORDING MEDIUM WITH THE PROGRAMS

摘要

PROBLEM TO BE SOLVED: To improve the coding efficiency in coding a moving picture by reducing the code quantity without changing filter coefficients for forming image information at fractional positions.

SOLUTION: A motion searching unit 16 executes a motion search over all patterns of filter coefficients designated by a filter coefficient designator 15 to obtain motion vectors based on image information inputted to an image input unit 11, a filter coefficient determining unit 17 determines filter coefficients at which the difference evaluation value Wm is minimum as filter coefficients of a macro block, a filter coefficient selective motion vector coding unit 18 codes a combination of information of whether the determined filter coefficients are different from reference filter coefficients with motion vector information, and a filter coefficient coding unit 19 codes information of designating the filter coefficient if the determined filter coefficients are different from the reference filter coefficients.

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