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Method of extracting a watermark

  • US 8,180,098 B2
  • Filed: 04/25/2003
  • Issued: 05/15/2012
  • Est. Priority Date: 05/22/2002
  • Status: Active Grant
First Claim
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1. A method of extracting a watermark which is embedded in an information signal, the information signal representing media content, the method comprising:

  • extracting a fingerprint from the information signal, the fingerprint identifying the media content represented by the information signal;

    retrieving a previously stored supporting signal pertaining to the information signal based on the fingerprint, the supporting signal being at least a part of an original signal on which the information signal is based, and the supporting signal being mapped to a fingerprint of the original signal; and

    detecting the watermark embedded in the information signal based on a difference between the information signal and the supporting signal.

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