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Apparatus and methods for improving detection of watermarks in content that has undergone a lossy transformation

  • US 6,782,116 B1
  • Filed: 11/04/2002
  • Issued: 08/24/2004
  • Est. Priority Date: 11/04/2002
  • Status: Expired due to Term
First Claim
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1. A method of obtaining information about a first digital representation that may be derived from a second digital representation, the second digital representation having a watermark embedded therein and the method comprising the steps of:

  • extracting a first watermark vector from a portion of the first digital representation that corresponds to a portion of the second digital representation in which the watermark is embedded;

    obtaining a second watermark vector that is a replica of the watermark'"'"'s watermark vector; and

    computing a similarity of the first watermark vector with the second watermark vector.

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