Method of processing image signal

Details Method of processing image signal Method of processing image signal

1985-06-10

1988-02-09

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

382 41, 382 54, G06K 936

Patent

active

047245441

ABSTRACT:
A method of processing image or picture signals, including the steps of setting an n.times.n picture element matrix window (where n is an odd number) with respect to an image signal obtained by scanning an original picture; calculating a correction amount for pixel information at a center position of the window by a predetermined formula obtained on the basis of all of the pixel information within the window; subtracting pixel information of respective picture elements in the window by a suitable subtrahend; calculating the correction amount from added values obtained by adding all the pixel information within the window; converting the correction amount into a correcting value by multiplying the correction amount by a correction coefficient which also takes into consideration the effect of the subtraction on the correction amount; and correcting the pixel information by using the correcting value.

REFERENCES:
patent: 4398256 (1983-08-01), Nussmeier et al.
patent: 4464788 (1984-08-01), Sternberg et al.
patent: 4499598 (1985-02-01), Chittineni
patent: 4506382 (1985-03-01), Hada et al.

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