Method and apparatus for processing a document by segmentation i

Details Method and apparatus for processing a document by segmentation i Method and apparatus for processing a document by segmentation i

1996-02-20

1999-03-16

Kelley, Christopher S

Image analysis

Image segmentation

Distinguishing text from other regions

382112, 382164, 382169, 382128, 382180, 382226, 382270, 382271, G06K 934

Patent

active

058839739

ABSTRACT:
A multi-stage, preprocessing technique increases the quality of a monochrome or colored mixed-mode document printed on a binary-type printer. The document is preferably apportioned into a plurality of small tiles, each of which provides information to the inventive technique for eventually defining the modes as either text or images. The multi-stage technique comprises a first stage for normalizing a non-ideal histogram of the mixed-mode document to a histogram having an ideal distribution of selected pixel values. A second stage classifies each tile as either text, image or background, while a third stage collates groups of tiles in both vertical and horizontal directions to remove variances in the document. Those portions of the document classified as images are then halftone processed, while the text areas are threshold processed to thereby significantly improve the reproduction quality of the printed document.

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