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Extraction of embedded watermarks from a host content using a plurality of tentative watermarks

  • US 8,923,548 B2
  • Filed: 11/03/2011
  • Issued: 12/30/2014
  • Est. Priority Date: 11/03/2011
  • Status: Active Grant
First Claim
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1. A method, comprisingextracting a plurality of tentative watermarks from an embedded host content, each tentative watermark representing a candidate watermark with an associated probability of false watermark detection that exceeds a desired probability of false watermark detection;

  • obtaining estimated distortion information associated with one or more distortions present in the embedded host contents using at least two of the extracted tentative watermarks;

    based on the estimated distortion information, obtaining one or more pre-distorted watermark templates, each pre-distorted watermark template representing a watermark that would be extracted from the host content when a specific distortion or a specific combination distortions is present in the host content; and

    re-evaluating at least one of the extracted tentative watermarks using the one or more pre-distorted watermark templates.

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