Apparatus and method for testing bank notes for genuineness using Fourier transform analysis
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United States of America Patent
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Jun 25, 1996
Grant Date -
N/A
app pub date -
Dec 21, 1994
filing date -
Jul 4, 1994
priority date (Note) -
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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.
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