Method and system for enhancement of a digitized image

Details Method and system for enhancement of a digitized image Method and system for enhancement of a digitized image

1988-07-15

1990-07-10

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

382 27, 382 50, 382 52, 358166, 358447, 358464, G06K 936

Patent

active

049411900

ABSTRACT:
A system and method of modifying pixels supplied to the system that a multiple level signals for a digitized image wherein a moving pixel window with a center pixel, D.sub.c, is used from which the annular means, m.sub.a, of the center pixel (the mean of the 2.sup.N pixel values of the window surrounding the center pixel, where N is an integer of 1 or more) is determined with the center pixel and selected pixels surrounding the center pixel, D.sub.c, are used to determine a measure of deviation (center deviation, .sigma..sub.c) of the center pixel relative to the center pixel that is used to obtain a modification gain, f(.sigma..sub.c,C.sub.g). The center pixel, D.sub.c, its annular mean, m.sub.a, and its modification gain, f(.sigma..sub.c,C.sub.g) or F'(.sigma..sub.c,C.sub.g) are used to obtain a modified center pixel value, D.sub.c 40 , in accordance with one of the following equations that are of the form for an algorithm for determining the unsharp marking filter value for an image pixel:

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