High contrast fingerprint image detector

Details High contrast fingerprint image detector High contrast fingerprint image detector

1995-09-08

1997-04-22

Johns, Andrew

Image analysis

Applications

Personnel identification

356 71, G06K 900

Patent

active

056235534

ABSTRACT:
In a fingerprint input apparatus used to detect an image of a fingerprint, light is emitted towards a finger which is placed on an image detecting surface of a prism. An incident angle of light on the image detecting surface is less than a critical angle. An image sensor detects light which has been diffused by the fingerprint and directed towards the image sensor.

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patent: 4924085 (1990-05-01), Kato et al.
patent: 5109427 (1992-04-01), Yang
patent: 5177802 (1993-01-01), Fujimoto et al.
patent: 5233404 (1993-08-01), Lougheed et al.
patent: 5416573 (1995-05-01), Sartor, Jr.
English Translation of European Patent Application 045 913 to Rull et al., publ. Feb. 1982.
English Translation of Japanese Kokai 3-194677 to Takeda et al., publ. Aug. 1991.
English Translation of Japanese Kokai 2-270087 to Shindo, publ. Nov. 1990.

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