Patent ID: 6243416
Filing Date: 2001-06-05
Classification: H04N

Abstract:
A method of coding an image made up of pixels having pixel values by dividing the image into blocks, comprising the steps of:providing a table of predetermined patterns identical in size and shape to said blocks, said patterns including a plurality of patterns each having at least two regions defined by at least one internal edge, said patterns being identified by pattern identifiers;detecting internal edges in said blocks, thereby matching each block among said blocks with one of the patterns in said table;calculating, for each block among said blocks, one representative pixel value for each region in the pattern matching said block, said one representative pixel value being calculated from the pixel values of the pixels in said block in positions corresponding to said region; andcoding each said block by a pattern identifier identifying the pattern matching the block, accompanied by the representative pixel value calculated for each region in the pattern thus identified.