IMAGE ENCODING DEVICE, IMAGE DECODING DEVICE, IMAGE ENCODING METHOD, IMAGE DECODING METHOD, AND MEDIUM

摘要

PROBLEM TO BE SOLVED: To provide an image encoding device, an image decoding device, an image encoding method, and an image decoding method which can perform encoding and decoding more efficiently than when conventional binary image encoding and decoding technologies are used by predicting encoded pixels from a previously obtained binary image having high correlation and encoding their differences, and providing a medium in which programs for making a compute execute those operations are recorded. SOLUTION: This device is provided with a block dividing means 1(101) which inputs an object binary image to be encoded and divides the object binary image into blocks containing pixels to obtain an object block, a block dividing means 2(102) which divides the previously obtained reference binary image into blocks containing pixels to obtain a reference block, an exclusive OR block constituting means (103) which scans the said object block and reference block in order to detect exclusive OR between both pixel values and constitute an exclusive OR block, and an exclusive OR encoding means (104) which generates a code sequence of the exclusive OR and outputs it as encoded data.