Facsimile dynamic thresholding apparatus and method of use there

Details Facsimile dynamic thresholding apparatus and method of use there Facsimile dynamic thresholding apparatus and method of use there

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:
patent: 4266249 (1981-05-01), Chai et al.
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.

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