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

  • US 20050025338A1
  • Filed: 08/23/2004
  • Published: 02/03/2005
  • Est. Priority Date: 11/04/2002
  • Status: Active Grant
First Claim
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1. A method of obtaining information about a first digital representation of a sequence of images that may be derived from a second digital representation of the sequence of images, 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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