Image processing system for adaptive coding of color document im

Details Image processing system for adaptive coding of color document im Image processing system for adaptive coding of color document im

1994-09-06

1997-12-09

Boudreau, Leo

Image analysis

Image segmentation

Distinguishing text from other regions

382239, 382257, 358462, G06K 934

Patent

active

056968426

ABSTRACT:
An image processing system includes an input part for reading an image from a color document containing a multilevel gradation graphic image and a text image, a region separator part for separating the image into a plurality of elemental blocks having M.times.N picture elements according to a type of image data that is contained in each elemental block, whether the elemental block contains a black-and-white line portion of the image or a halftone portion of the image, and an encoding part for encoding image data in the black-and-white line portion through an encoding process appropriate for bi-level image data and for encoding image data in the halftone portion through an encoding process appropriate for multilevel gradation image data so as to produce a compressed image.

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A. Katayama, "Encoding System for Character/Picture Documents", Institute of Image Processing and Electronics Engineers of Japan, No. 31, 1990, pp. 131-136.

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