Method of enhancing image sharpness for image reproduction using

Details Method of enhancing image sharpness for image reproduction using Method of enhancing image sharpness for image reproduction using

1989-02-03

1990-11-20

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 79, 358166, 358447, H04N 146

Patent

active

049722565

ABSTRACT:
An original image is read with an image reader for each pixel, whereby color component signals (Yi, Mi, Ci, Ki) expressing the original image are obtained. A sharp signal generator extracts the gray component from the combination of the color component signals, to output the gray component as a sharp signal (S.sub.O). The difference between the sharp signal (S.sub.O) and an unsharp signal (U) is linearly combined with the color component signals, to thereby give sharpness-enhanced signals (ES.sub.Y, ES.sub.M, ES.sub.C, ES.sub.K).

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patent: 4845550 (1989-07-01), Urabe et al.
patent: 4868671 (1989-09-01), Murakami

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