Apparatus and method for testing bank notes for genuineness usin

Details Apparatus and method for testing bank notes for genuineness usin Apparatus and method for testing bank notes for genuineness usin

1994-12-21

1996-06-25

Boudreau, Leo

Image analysis

Applications

Reading paper currency

382280, 356 71, G06K 900

Patent

active

055307728

ABSTRACT:
In apparatus for detecting counterfeit bank-notes, an electronic camera forms a digital representation of a small area of the bank-note. The digital image is stored in an image memory. The Fourier transform of the digital image is then computed and analyzed to determine if it contains high spatial frequency components, and if so, the note is identified as counterfeit. The analyzer may use pattern recognition techniques. In a modification, Fourier transforms of a plurality of small areas are formed and averaged and the average is analyzed. This invention is particularly suitable for identifying counterfeit bank-notes having regular patterns e.g. of lines or dots, therein, such as are produced by color photocopiers or offset lithography printing.

REFERENCES:
patent: 4454610 (1984-06-01), Sziklai
patent: 4817176 (1989-03-01), Marshall et al.
patent: 4843631 (1989-06-01), Steinpichler et al.
patent: 4881270 (1989-11-01), Knecht et al.
patent: 5175775 (1992-12-01), Iwaki et al.
English Abstract for NL 9201701, Derwent Publications Ltd., Abstract No. 94-174353.

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