MOTION VECTOR GENERATOR, IMAGE CODER, MOTION VECTOR GENERATING METHOD AND IMAGE CODING METHOD

摘要

PROBLEM TO BE SOLVED: To provide a motion vector generator that generates a motion vector more properly corresponding to a characteristic of an image to be coded and encodes the image without incurring deterioration in the image quality and to provide an image coder or the like provided with the motion vector generator. SOLUTION: The motion vector generator is provided with plural vector generators 10, 11 that generate respectively a motion vector with other frame corresponding to each retrieval range and each retrieval accuracy by using mutually different retrieval ranges and mutually different retrieval accuracies by each macro block in one frame of an input signal Sin in the case that the motion vector is generated for motion compensation when the input signal Sin including an image of plural frames is coded by using the motion compensation by inter-frame prediction and a comparator 12, and a switch 13, that selects a motion vector among plural generated motion vectors and outputs the selected motion vector as the motion vector corresponding to the macro block in correspondence with a characteristic of the image in the macro block.