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Techniques and systems for embedding and detecting watermarks in digital data

  • US 7,496,209 B2
  • Filed: 07/27/2004
  • Issued: 02/24/2009
  • Est. Priority Date: 07/29/2003
  • Status: Expired due to Fees
First Claim
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1. A method for embedding a watermark in data, including a processor to perform the steps of:

  • analysing the data to derive a transform matrix for extracting from the data amplitudes of statistically mutually independent components of the data;

    encoding the data using the transform matrix;

    classifying said components in accordance with their energies, into higher, lower and medium energy ranges;

    selecting the components classified in said medium energy range;

    modifying at least a portion of the selected components using a watermark pattern; and

    decoding the data using an inverse of the transform matrix to obtain watermarked data in which the watermark pattern is embedded.

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