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Fragile and emerging digital watermarks

  • US 20050041835A1
  • Filed: 04/29/2004
  • Published: 02/24/2005
  • Est. Priority Date: 07/02/2001
  • Status: Active Grant
First Claim
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1. A method for analyzing an image of a printed object to determine whether the printed object is a copy or an original, said method comprising:

  • analyzing a machine readable auxiliary signal that is embedded in the image, wherein the auxiliary signal is embedded at embedding locations using a print structure that changes in response to a copy operation, the change causing a convergence of a characteristic such that the machine readable signal becomes more detectable; and

    based on evaluating the machine readable auxiliary signal, determining whether the printed object is a copy or an original.

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