Apparatus for producing fingerprint images which are substantial

Details Apparatus for producing fingerprint images which are substantial Apparatus for producing fingerprint images which are substantial

1993-09-10

1995-05-16

McGraw, Vincent P.

Optics: measuring and testing

Document pattern analysis or verification

G06K 920

Patent

active

054165733

ABSTRACT:
An apparatus for imaging a finger so as to produce a fingerprint image free of artifacts created by moisture on the finger. An optical platen having a surface for receiving the finger to be imaged is illuminated by a light source. A light detector is provided for receiving light from the platen surface which is internally reflected at the surface. A fingerprint image is formed by light which is internally reflected at the regions intermediate the finger ridges and absorbed/dispersed where the ridges contact the surface, The observation angle of the detector is sufficiently large so that moisture on a person's fingers does not affect the light which is internally reflected at the surface and detected. The resultant fingerprint image is free of artifacts attributable to moisture.

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D. T. Follette, E. B. Hultmark & J. G. Jordon, "Direct Optical Input System for Fingerprint Verification," IBM Technical Disclosure Bulletin, vol. 16, No. 11, Apr. 1974, pp. 3572-3573.

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