System and method for determining which of a plurality of visual

Details System and method for determining which of a plurality of visual System and method for determining which of a plurality of visual

1997-07-29

1998-10-20

Font, Frank G.

Optics: measuring and testing

Document pattern analysis or verification

283 86, 359 2, 235457, 235494, G06K 974, G03H 100, B42D 1500

Patent

active

058254757

ABSTRACT:
A system and method for determining which of a plurality of visually indistinguishable objects have been marked with a covert indicator in which a portion of a surface of each of a first type of objects are provided with a covert holographic indicator which is exposed to be viewed but which is detectable only when illuminated with a coherent reference light of predetermined wavelength. The surfaces of objects are scanned with a coherent reference light with the predetermined wavelength, and evaluated to determine whether the scanned surfaces include the covert holographic indicator. The presence of the covert holographic indicator indicates that the object on which the covert holographic indicator is detected is one of the first type of objects. The first type of object may be a winning game ticket, or a genuine, as opposed to counterfeit, article.

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