APPARATUS AND METHOD FOR GIVING PRESISTENCE TO COMPRESSED IMAGE DATA BY USING LARGE-AREA BLOCK CONVERSION

摘要

PURPOSE: To provide technology and a device for giving rigidity against the burst error of the data pattern of picture data showing local redundancy. CONSTITUTION: Prior to compressing/encoding localizing (blocking) picture data into a 'holography form' by 7401 -740N for transmission/storage, a converter 720 executes global block conversion such as global block Hadamard conversion by a converter 720. To globally convert a picture is to diffuse picture data of the picture elements of the picture or the respective blocks of the conversion coefficient by a regulated global method which is regularly ordered for the whole picture for generating picture data which is intentionally 'smeared'. Even if a part of 'smeared' picture data is eliminated in transmission or reproduction by converting picture data which is 'smeared' in terms of an inverted global block at the time of expansion, the whole picture can effectively be re-constructed to a certain degree from remaining 'smeared' picture data.