System and method for determining if a fingerprint image contain

Details System and method for determining if a fingerprint image contain System and method for determining if a fingerprint image contain

1996-10-23

1999-11-30

Kelley, Christopher S

Image analysis

Applications

Personnel identification

382125, 382272, G06K 900

Patent

active

059956402

ABSTRACT:
A fingerprint image is divided into blocks of pixels. The blocks are also determined to be within the foreground or background of the image. A dryness process determines a mean intensity of pixels within each foreground block, a second mean intensity of pixels for those pixels whose intensities are smaller than the mean intensity, a standard deviation of intensities of all pixels within the respective foreground block, and a contrast measure being a function of a first ratio of the second mean intensity to the standard deviation. A comparator that determines that the foreground block is a dry block if the contrast measure is larger than a dryness threshold and that the image is a dry image if a second ratio of the number of dry blocks to total number of foreground blocks is larger than a third dryness threshold.

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