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Watermark detection using a fourier mellin transform

  • US 6,408,082 B1
  • Filed: 11/30/1999
  • Issued: 06/18/2002
  • Est. Priority Date: 04/25/1996
  • Status: Expired due to Fees
First Claim
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1. A method for detecting a watermark comprising:

  • obtaining a data set representing media content;

    transforming the data set in a selected transform domain;

    remapping the transformed data set into a log polar coordinate system;

    performing a correlation between a detection watermark and the transformed data set in the log polar coordinate system to compute one or more orientation parameters that approximate an orientation of a watermark pattern in the data set.

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