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Method and system for watermark detection

  • US 20060039580A1
  • Filed: 02/13/2004
  • Published: 02/23/2006
  • Est. Priority Date: 08/30/2000
  • Status: Active Grant
First Claim
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1. A method for detecting a watermark in an image of a document including data, the steps of the method comprising:

  • measuring the distribution of the data on the document;

    determining a characteristic frequency of the distribution of the data on the document; and

    comparing the characteristic frequency of the data on the document with the frequency which is associated with the document to determine if the document is authentic.

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