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Digital watermark screening and detection strategies

  • US 6,768,809 B2
  • Filed: 02/04/2003
  • Issued: 07/27/2004
  • Est. Priority Date: 02/14/2000
  • Status: Expired due to Term
First Claim
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1. A method of analyzing a signal suspected of being embedded with an auxiliary signal, the method comprising:

  • computing detection values from a suspect signal, where each detection value corresponds to a measure of an auxiliary signal embedded in the suspect signal, the auxiliary signal being detected comprises a set of attributes embedded at locations within the suspect signal, and each detection value is a measure of the set of attributes;

    computing a relative detection value based on an analysis of two or more of the detection values relative to each other; and

    controlling detector action based on the relative detection value.

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