Apparatus and method for detecting a security feature in a currency note
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Aug 15, 2000
Grant Date -
N/A
app pub date -
Feb 12, 1998
filing date -
Feb 12, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An apparatus and method for detecting watermark and security thread in a currency note. Optical sensing circuits positioned from the surface of the currency note rely upon the transmissive and reflective characteristics of the security features and the note itself to determine the authenticity of the note and the security feature. The apparatus and methods determine a difference signal between the transmissive and reflective light signals and compare the difference signal to a series of known difference signals.
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