Fingerprint input apparatus

Details Fingerprint input apparatus Fingerprint input apparatus

1991-03-04

1993-01-05

Goldstein, Herbert

Image analysis

Histogram processing

For setting a threshold

336 71, G06K 920

Patent

active

051778025

ABSTRACT:
A fingerprint input apparatus is constructed to have simple construction. It serves to provide an excellen S/N ratio and reliably input a fingerprint pattern. The fingerprint input apparatus includes a light source for emitting a ray of light, a lightguide plate having a predetermined location at which a finger can be contact with the lightguide plate, a unit for directing the ray of light into at least one surfaces of the lightguide plate in a manner to keep such an angle of incidence as allowing the ray of light to be totally reflected within the lightguide plate, the lightguide plate being constructed to direct the ray of light into the predetermined location, and an image pickup unit located near the predetermined location of the lightside plate and outside of an opposite surface to a surface having the predetermined location, the image pickup unit being constructed to pick up a right irregularly reflected on a fingerprint surface of the finger contacted with the predetermined location.

REFERENCES:
patent: 3975711 (1976-08-01), McMahon
patent: 4246568 (1981-01-01), Peterson
patent: 4569080 (1986-02-01), Schiller
patent: 4785171 (1988-11-01), Dowling, Jr. et al.
patent: 4905293 (1990-02-01), Asai et al.
patent: 5077803 (1991-12-01), Kato et al.

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