Optical: systems and elements – Holographic system or element – Authentication
Patent
1997-05-09
1999-12-14
Spyrou, Cassandra
Optical: systems and elements
Holographic system or element
Authentication
359 29, 359 35, 359561, 356 71, G03H 100, G06K 974
Patent
active
060024992
ABSTRACT:
A real time fingerprint verification system includes a recording device and a verification device each having a fingerprint scanner for generating a flat, dimensionally undistorted, high contrast, fingerprint image, and an intensity sensitive, spatial light modulator (SLM) for receiving and transforming the flat fingerprint image into a planar, coherent light image. In the recording device, the planar coherent light image beam of the fingerprint from the SLM is Fourier transformed, and input into a microscope objective lens system which expands the Fourier transformed beam image sufficiently to allow mechanical blocking of its central portion or order, whereupon it is directed to interact as an object beam with a reference beam from the particular coherent light source to record a holographic matched filter. In the verification device, the planar coherent light image beam of the fingerprint is Fourier transformed and input into a microscope objective lens system to allow similar mechanical blocking of its central portion or order whereupon it is directed to interrogates a previously recorded holographic matched filter of a fingerprint image as an object beam for determining a match or not between the respective recorded and interrogating images. The spatial light modulator (SLM) in both the respective recording and verification devices enables phase correlation (optical path length determination) of one device to another device. X-Y alignment and rotational orinentation of he respective real time image and holographic matched filter image is accomplished by jittering (orbiting and angularly oscillating) either the interrogating object beam, real time, relative to the matched filter or visa versa.
REFERENCES:
patent: 3716301 (1973-02-01), Caulfield et al.
patent: 4876725 (1989-10-01), Tomko
patent: 5598485 (1997-01-01), Kobayashi et al.
Electronic Fingerprint Transmission Specification Prepared by: Federal Bureau of Investigation Criminal Justice Information Services Division May 2, 1997 --CJIS-RS-0010 (V4R3.
Bahuguna Ramendra D.
Corboline Thomas M.
Advanced Precision Technology Inc
Newhouse, Esq David E.
Schuberg Darren E.
Spyrou Cassandra
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