Method and apparatus for compressing color or gray scale documents

摘要: A technique for compressing a color or gray scale pixel map representing document. The is decomposed into three-plane representation, reduced-resolution foreground plane, background and high-resolution binary selector plane. plane contains the information of items such as text. "background" page continuous tone pictures that are contained on page. stores selecting from either during decompression. Each respective planes compressed using compression optimal corresponding data type. Also described method decompressing documents three representation at arbitrary resolutions.