Patent ID: 6445826
Filing Date: 2002-09-03
Classification: H04N

Abstract:
An image decoding apparatus which receives an encoded image signal obtained by encoding an image signal comprising a plurality of blocks and decodes the encoded image signal, said encoded image signal comprising pixel value signal and shape signal which is binary information and indicates whether each pixel is significant or not, said apparatus comprising:first decoding means for decoding the encoded image signal to obtain mode identifying information indicating shape encoding mode corresponding to the shape signal and pixel value encoding mode corresponding to the pixel value signal, wherein the shape encoding mode and the pixel value encoding mode are included in coded data corresponding to one of the blocks; and second decoding means for, on the basis of the obtained mode identifying information, subjecting an encoded block of the pixel value signal to decoding process adapted to the pixel value encoding mode and subjecting an encoded block of the shape signal to decoding process adapted to the shape encoding mode.