Methods for digitally noise averaging and illumination equalizin

Details Methods for digitally noise averaging and illumination equalizin Methods for digitally noise averaging and illumination equalizin

1987-02-27

1989-03-07

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

382 4, 382 54, 358163, G06K 900, G06K 956

Patent

active

048114146

ABSTRACT:
Methods for operating a programmable digital computer to enhance images of fingerprints represented by an array of pixel values. Methods for noise averaging, illumination equalizing, directional filtering, unhairing, curvature correcting, and scale correcting a fingerprint image are disclosed.

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