Patent ID: 6473531
Filing Date: 2002-10-29
Classification: H04N

Abstract:
An image information coding system comprising:coded image information decoding means for decoding input coded image information and outputting first decoded image information and code attribute information; image information dividing means for dividing the first decoded image information outputted from said decoding means into rectangular regions consisting of a predetermined number of pixels; image information analyzing means for measuring a statistic of divided image information outputted from said image information dividing means and analyzing to what degree said divided image information is apt to be degraded in its image quality by coding, said image information analyzing means then outputting image quality control information; coding parameter control means for deciding a coding parameter for obtaining a desired image quality with respect to second decoded image information in accordance with said image quality control information, said second decoded image information being the result of coding and decoding of said first decoded image information; and image information coding means for encoding said divided image information with use of the coding parameter outputted from said coding parameter control means, wherein said image information analyzing means predicts the degradation of said first decoded image information and the degree of influence thereof on the image information analysis on the basis of the code attribute information outputted from said coded image information decoding means, then makes correction in accordance with the result of said prediction, and thereafter analyzes said divided image information.