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Methods and devices for recognizing banknotes and responding accordingly

  • US 6,427,020 B1
  • Filed: 04/15/1999
  • Issued: 07/30/2002
  • Est. Priority Date: 05/08/1995
  • Status: Expired due to Fees
First Claim
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1. A method of deterring reproduction of a security document, comprising:

  • encoding the security document with plural-bit digital data, said encoding not being apparent to a human observer of the security document;

    providing sampled image data corresponding to said security document as scanned by a visible light scanning device;

    analyzing said image data to detect the digital data therein, said detection signifying that the image data likely corresponds to a security document; and

    intervening in response to detection of the digital data.

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