Patent ID: 6400844
Filing Date: 2002-06-04
Classification: G06K

Abstract:
A method of segmenting digital image data for mixed raster content processing, comprising:a) acquiring a block of the digital image data, wherein the digital image data is composed of light intensity signals in discrete locations; b) designating a classification for said block and providing an indication about a context of said block; c) segmenting said light intensity signals in said block into an upper subset and a lower subset based upon said designated classification; d) generating a selector set which tracks said light intensity segmentation; and e) separately compressing the digital image data contained in said upper and lower subsets; wherein said block is classified as one of either substantially uniform data, substantially smooth data, substantially weak edge data, or substantially edge data, and further comprising; i. measuring an amount of light intensity signal variation throughout said block; ii. assigning a classification to said block based upon said measured light intensity signal variation; and iii. updating said context indication for said block, and designating said classification for said block based upon said updated context.