Image signal coding and decoding apparatus

摘要

Image signal coding and decoding apparatus is adapted to reduce the redundancy between move vectors in divided blocks of an image to realize enhanced data compression. The coding apparatus comprises a local decoder (9) for locally decoding quantized data; a move detector (11) for calculating the move vectors of individual subblocks defined by dividing each of macroblocks (MB) for move compensation of a dynamic image; a controller (12) for selecting an optimal process for the move vectors to minimize the redundancy; a move compensator for forming a predictive image; and a difference calculator (2) for calculating the difference between the predictive image and the original image signal corresponding thereto. The image signal decoding apparatus comprises an inverse multiplexer for separating the coded data into variable-length coded data and vector coded data; and a controller (30) for selecting an optimal move vector process on the basis of the vector coded data. <IMAGE>