Patent Document ID: 5491564
Application ID: 08202070
Patent Status: 1

Claim One:
1. A method of data compression for a binary image, comprising: a first step of calculating an image statistic from an input binary image; a second step of performing area classification of said input binary image according to said image statistic and preparing area classification data; and a third step of producing reference data to be used in Markov model encoding; said reference data is composed of a first data portion corresponding to said area classification data and a second data portion comprising a data portion other than said first data portion, said second data portion including at least one value which is selected in accordance with said area classification data from (i) a predicted gray-level value of an attentional pixel calculated from encoded pixels, (ii) a pixel value of the encoded pixel having a strong correlation with said attentional pixel, and (iii) a pixel value of a pixel neighboring said attentional pixel.