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Digital watermark systems and methods

  • US 7,987,370 B2
  • Filed: 11/14/2007
  • Issued: 07/26/2011
  • Est. Priority Date: 02/20/1997
  • Status: Expired due to Fees
First Claim
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1. A digital watermarking method comprising:

  • receiving coefficients in a transform domain representation;

    inserting digital watermark data by altering at least one of the coefficients in accordance with digital watermark data to be encoded;

    inverse-transforming the at least one altered coefficients; and

    applying an inverse spectral whitening operation to results of the inverse-transforming act, to yield digitally watermarked content;

    wherein the foregoing acts are performed by programmable computer circuitry.

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