System and method for determining which of a plurality of visually indistinguishable objects have been marked with a covert indicator
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United States of America Patent
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Oct 20, 1998
Grant Date -
N/A
app pub date -
Jul 29, 1997
filing date -
Jul 29, 1997
priority date (Note) -
Expired
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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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