Image analysis – Applications – Personnel identification
Patent
1997-07-08
1998-10-13
Boudreau, Leo H.
Image analysis
Applications
Personnel identification
382124, 356 71, G06K 900
Patent
active
058224459
ABSTRACT:
A fingerprint identifying device includes a transparent prism having a fingerprint receiving face, a fingerprint viewing face at an acute angle to the fingerprint receiving face, two opposed parallel faces perpendicular to the fingerprint receiving face and a further light-absorbing face generally opposite to the fingerprint viewing face. A light source in the form of a bank of LEDs is provided for transmitting light into the prism. A light diffuser is provided for light transmitted from the light source such that in operation diffused light is transmitted into the prism through both of the parallel faces and against the fingerprint receiving face to provide substantially uniform illumination of a finger contacting the fingerprint receiving face, a fingerprint image being visible through the fingerprint viewing face. Preferably, the bank of LEDs is disposed at the two opposed parallel faces adjacent to the fingerprint receiving face. It is also preferred if the light source extends above the plane of the fingerprint receiving face to illuminate the edges of a finger from outside of the prism.
REFERENCES:
patent: 3482498 (1969-12-01), Becker
patent: 3527535 (1970-09-01), Monroe
patent: 5210588 (1993-05-01), Lee
patent: 5467403 (1995-11-01), Fishbine et al.
Boudreau Leo H.
Dew Engineering and Development Limited
Mehta Bhavesh
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