Patent ID: 6707939
Filing Date: 2004-03-16
Classification: G06T,H04N

Abstract:
A method for compressing digital image data present as a matrix of MÃ—N pixels, to a reduced data set, which comprisesa) dividing the matrix of MÃ—N pixels into blocks of uÃ—v pixels, b) classifying the blocks of uÃ—v pixels into blocks containing only pixels of one block color, or single-color blocks, blocks containing pixels of a foreground color and pixels of a background color, or two-color blocks, and blocks containing pixels with more than two colors, or multicolor blocks, and c) coding, in the image data of the single-color blocks and the two-color blocks, by command code words and data words, pixel patterns which are repeated in at least one manner selected from the group consisting of from block to block and within a block, respectively.