Spatial integrating optical correlator for verifying the authenticity of a person, product or thing
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United States of America Patent
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Nov 24, 1998
Issued Date -
N/A
app pub date -
Jul 11, 1997
filing date -
Nov 14, 1994
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method of verifying the authenticity of an object is disclosed employing a spatial integrating optical correlator. An unreadable and hence non-counterfeitable mask (e.g., a. complex mask or a phase mask) is coupled to the object and the optical correlator compares the mask with a reference mask on which it is scanned over. The correlator produces a correlation spot or image having an intensity which exceeds a given level if the mask is genuine. An alternate embodiment includes a fingerprint or other personalized pattern bonded to the mask, and the fingerprint or other personalized pattern on the card is compared to a reference fingerprint or other personalized pattern of the card holder for added security.
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