Automatic adaptive anisotropic digital filtering and biasing of

Details Automatic adaptive anisotropic digital filtering and biasing of Automatic adaptive anisotropic digital filtering and biasing of

1989-07-14

1991-03-26

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

36472412, 382 52, G06K 936

Patent

active

050036181

ABSTRACT:
Adaptive anisotropic digital filtering is automatically applied to the gray cale values of substantially of all the pixels in at least a portion of a digital image by, for each such pixel, selecting and angularly orienting the matrix of coefficients of an anisotropic filter kernel as a weighting function of the gray scale values of pixels in eight, 45 degree sectors under the kernel, and then performing a convolution of the gray scale values of pixels under the kernel with the rotated kernel to generate a filtered value for the center pixel. Local brightness of the image is adjusted either in conjunction with anisotropic filtering or separately by comparing for each pixel the average gray scale value of the pixels under the kernel with a reference value and applying a bias function to the center pixel grey scale value to brighten or darken the image dependent upon the results of the comparison.

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patent: 4811414 (1989-03-01), Fishbine et al.
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