Method and apparatus for compressing color or gray scale documen

Details Method and apparatus for compressing color or gray scale documen Method and apparatus for compressing color or gray scale documen

1996-12-20

1998-07-07

Vu, Kim Yen

Image analysis

Image segmentation

Distinguishing text from other regions

382284, 358534, 358456, 358464, H04N 164

Patent

active

057780927

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

REFERENCES:
patent: 5615281 (1997-03-01), Yamaguchi
patent: 5642204 (1997-06-01), Wang
patent: 5701365 (1997-12-01), Harrington et al.

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