Image discrimination with continuous tone area thinning

Details Image discrimination with continuous tone area thinning Image discrimination with continuous tone area thinning

1987-11-02

1989-08-29

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358464, 358447, H04N 140

Patent

active

048622834

ABSTRACT:
Apparatus and method for discriminating between regions of text and continuous tone areas of mixed format documents and for selecting print
o-print decisions to be made by either an image processing algorithm optimized for text or an image processing algorithm optimized for continuous tone. A video signal of digital values indicative of pixels representing the image content of the document is applied to a two-level comparator to produce a preliminary text mode or continuous tone mode decision. A continuous tone preliminary decision is changed to a text decision if the pixel of interest is within a predetermined distance of a text pixel.

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