Fingerprint image refinement

Details Fingerprint image refinement Fingerprint image refinement

1983-06-23

1986-02-04

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

356 71, G06K 936

Patent

active

045690804

ABSTRACT:
In an optical fingerprint image processing apparatus a light beam is scanned across a finger placed against a transparent platen in order to provide a reflected modulated light beam carrying fingerprint information. The modulated light beam is imaged and the image is intercepted by an array of photo receptors that detect the image and convert the optical signal into electrical signals. The improvement is in placing a diffuser element, which may be a ground glass wafer, in the interrogating light beam. The diffusion of the light beam acts as an effective filter to eliminate the higher spatial frequency components of the optical image and thus provide a fingerprint image having improved continuity.

REFERENCES:
patent: 3443098 (1969-05-01), Lewis
patent: 3511571 (1970-05-01), Ogle
patent: 3882462 (1975-05-01), McMahon
patent: 4120585 (1978-10-01), Depalma et al.
patent: 4322163 (1982-03-01), Schiller
Claassen et al., "Fingertip Orienting and Ridge Viewing Apparatus", IBM Technical Disclosure Bulletin, vol. 8, No. 3, 1965, pp. 435-436.

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