Patent ID: 7254273
Filing Date: 2007-08-07
Classification: H03M,H04N

Abstract:
1. A predictive data coding apparatus for still images containing a template generating means comprising: a database means that stores template information relating with positions of reference pixels together with the attribute parameters of the data; a looking up means to look up template information in said database means using said attribute parameters as looking up keys; a deciding means that decides whether optimization should be carried out or not according to a capability of the template that is obtained by said looking up means; a template optimizing means that generates the optimum template by using an optimization method that uses one or both of the code compression rate and the entropy as an estimation function and a registering means that registers the template information that is outputted from said template optimizing means to said database means wherein; a prediction of the value of a pixel in said image information is carried out by using the status of pixels that surround said pixel, said template with higher accuracy is generated through statistical processing and through analysis, assuming the dithering type used for generating the image to be compressed and additionally selecting reference pixels out of ideally placed pixels of the dither images by using a database in which relationship between the assumed dithering type and the template, and said image information is coded by using the result of said prediction.