Patent ID: 6414717
Filing Date: 2002-07-02
Classification: G06T,H04N

Abstract:
Picture data converting apparatus for converting first picture data into second picture data whose picture quality is lower than that of the first picture data comprising:an intermediate picture data generator for generating from said first picture data intermediate picture data whose picture quality approximates that of the second picture data; a store for storing the intermediate picture data; a block extractor for extracting from the intermediate picture data a plurality of pixel data for each block which is part of one screen; a predictive coefficient generator for generating predictive coefficients according to the extracted intermediate picture pixel data and the first picture data at a position corresponding to the extracted intermediate picture pixel data; a pixel value updater for updating the pixel values of the extracted intermediate picture pixel data according to the predictive coefficients, the intermediate picture data, and the first picture data; a predictive picture data generator for generating predictive picture data whose picture quality approximates that of the first picture data according to the updated pixel values of the extracted intermediate picture pixel data and the predictive coefficients; an error detector for detecting an error between the first picture data and the predictive picture data; and a controller responsive to said error for deciding whether or not the intermediate picture data is used as an output picture.