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Embedded optical signatures in documents

  • US 8,177,136 B2
  • Filed: 10/28/2010
  • Issued: 05/15/2012
  • Est. Priority Date: 12/19/2003
  • Status: Active Grant
First Claim
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1. A method of validating a document having an optical signature comprised of a predefined disuniform edge of the document, comprising the steps of:

  • placing the edge of the document against a background; and

    determining if the edge is disuniform and comparing the detected disuniform edge to the known predefined optical signature of the document thereby indicating if the document is valid based on a match between the detected disuniform edge and the optical signature of the document.

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