Apparatus and method for detecting a security feature in a curre

Details Apparatus and method for detecting a security feature in a curre Apparatus and method for detecting a security feature in a curre

1998-02-12

2000-08-15

Le, Que T.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

356 71, G06K 500

Patent

active

061040363

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.

REFERENCES:
patent: 4296326 (1981-10-01), Haslop et al.
patent: 4524276 (1985-06-01), Ohtombe
patent: 4980569 (1990-12-01), Crane et al.
patent: 5260582 (1993-11-01), Danek et al.
patent: 5468971 (1995-11-01), Ebstein et al.
patent: 5630755 (1997-05-01), Walsh et al.

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