Image analysis – Image enhancement or restoration – Variable threshold – gain – or slice level
Patent
1990-12-03
1995-10-03
Chan, Wing F.
Image analysis
Image enhancement or restoration
Variable threshold, gain, or slice level
358466, 358447, 358455, G06K 938
Patent
active
054558735
ABSTRACT:
A facsimile system for scanning a graphic image to produce a stream of output bits representative of an m.times.n array of picture elements of the image, each output bit being corrected to compensate for the average tone of a subarray of surrounding picture elements. The average tone is measured by a count of those gray levels, representative of the picture elements of the subarray, that exceed a nominal threshold. Thus the tone of the subarray dynamically adjusts the threshold of the gray level to output bit conversion of each picture element.
REFERENCES:
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patent: 4345314 (1982-08-01), Melamud et al.
patent: 4509195 (1985-04-01), Nadler
patent: 4720745 (1988-01-01), DeForest et al.
patent: 4731862 (1988-03-01), Tsuda et al.
patent: 4742399 (1988-05-01), Kitamura
patent: 5097520 (1992-03-01), Bessho et al.
Chan Wing F.
Freilich Arthur
Information International Inc.
Lee Ping W.
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