Method of, and apparatus for, edge enhancement of fingerprint mi

Details Method of, and apparatus for, edge enhancement of fingerprint mi Method of, and apparatus for, edge enhancement of fingerprint mi

1989-04-03

1990-06-26

McGraw, Vincent P.

Optics: measuring and testing

Document pattern analysis or verification

356369, 382 4, G06K 920

Patent

active

049366807

ABSTRACT:
A method for enhancement of edge detail in fingerprint minutia first illuminates the finger with light passing through a polarizer in a first direction with respect to the polarization plane, for at least a portion of one rotation of the light source/polarizer about an optical axis generally perpendicular to the finger. The light reflected from the finger is converted to video data during at least a selected part of the rotation and the first set of video data is stored in a first storage means register. The illuminating, converting and storing steps are then repeated with light from a second direction, substantially orthogonal the first direction, illuminating the finger, and with a second set of video data, (for at least the same part of another rotation) being stored in a second register. Arithmetically processing of the video data in the first and second storage registers is used to obtain a video output signal in which image edge detail data has been enhanced with respect to edge detail data obtainable from either the first and second sets of video data.

REFERENCES:
patent: 4160237 (1979-07-01), McMahon
patent: 4385831 (1983-05-01), Ruell

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