Optics: measuring and testing – Document pattern analysis or verification
Patent
1986-12-01
1987-09-01
McGraw, Vincent P.
Optics: measuring and testing
Document pattern analysis or verification
350 68, 356394, 356398, 382 4, G06K 920, G06K 974, G02B 2610
Patent
active
046905545
ABSTRACT:
A device employing the optical autocorrelation method for automatically comparing the fingerprint of an individual with a previously identified exemplar utilizes a pair of multifaceted mirrors rotating about mutually perpendicular axes to sweep an image of the fingerprint over the surface of the exemplar in a raster. To maintain the image in focus, a pair of independent identical relay lens systems are positioned in the light path and arranged symmetrically with respect to a common intermediate image plane. The mirrors are positioned so that as they rotate their reflective facets coincide successively with the aperture stop locations of the respective lens system. To compensate for possible angular misalignment of the fingerprint and the exemplar, novel independent optical means are provided for effectively rotating the image about the principal axis of the light path.
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Finkel Robert Louis
McGraw Vincent P.
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