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Apparatus and method for inserting and detecting watermark based on stochastic model

  • US 6,853,676 B2
  • Filed: 12/14/2000
  • Issued: 02/08/2005
  • Est. Priority Date: 06/15/2000
  • Status: Active Grant
First Claim
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1. An apparatus for inserting a watermark based on a stochastic model, said apparatus comprising:

  • means for generating a spread spectrum signal by using a user key from outside;

    means for estimating an autocorrelation matrix of an original signal from outside as an object for inserting a watermark;

    means for decomposing the autocorrelation matrix to an eigenvector matrix and an eigenvalue matrix;

    means for shaping a watermark from the spread spectrum signal in reference to both the eigenvector matrix and the eigenvalue matrix; and

    means for adding the watermark to the original signal.

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