Image analysis – Applications – Personnel identification
Patent
1996-09-09
1999-10-05
Boudreau, Leo H.
Image analysis
Applications
Personnel identification
382124, 356 71, 34082534, G06K 900
Patent
active
059636572
ABSTRACT:
Surface relief of a finger etc. is read using an optical-fiber prism unit, with fiber terminations at one end to contact the surface, and at the other for light passage along fibers from the first. Light enters where NA<0.5 and fiber diameter is constant with longitudinal position. The device is in a 1.4-2 L case, with a battery or power input, converter to form a corresponding data array for verifying, digital signal processor to do the verifying, and output to indicate or implement a decision. A video controller (with custom-programmed logic circuit) operates the sensors to develop the data array; an ADC digitizes the array; memory holds an authorized-user skin-pattern template, firmware for the processor, and data used in verifying; an output register holds the decision signal--all on a control, address, and data bus. High-power, radiative elements and a fast high-impedance data reader are on a common board in an isolating layout. The prism unit is cylindrical, held by a cylindrical-section cradle and forming a novel condenser lens to support lights and couple light to the prism. The imager has a cylindrical wall, transverse face for output of a skin pattern, and angled elliptical face to contact skin. To make many optical-fiber prisms each with one transverse and one angled face, transverse and angled cuts through a fused-fiber cylinder are alternated. The verifier can be within, and respond to the analysis to control, a door handle or lock: a hand need not move from reading position to open the door.
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Bolton Clive
Bowker J. Kent
Lubard Stephen C.
Miller Stephen G.
Wartman John M.
Areté Associates
Boudreau Leo H.
Mehta Bhavesh
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