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Digital watermarking in a perceptually uniform domain

  • US 6,792,129 B1
  • Filed: 08/23/2000
  • Issued: 09/14/2004
  • Est. Priority Date: 08/25/1999
  • Status: Expired due to Term
First Claim
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1. A method of detecting a watermark in a digital media object comprising:

  • for a set of features {xi*} extracted from a digital data set, transforming each feature xi* to a corresponding perceptual domain feature zi* in a perceptual domain feature set {zi*};

    providing a set of pseudorandom numbers {S1i} derived from a selected watermark key; and

    calculating a correlation figure q for {zi*} and {S1i};

    wherein the transforming operates on a set of frequency-based coefficients, transforming a frequency-based coefficient to a corresponding perceptual domain coefficient according to at least one of a frequency sensitivity function value, a luminance sensitivity adjustment, and a self-contrast masking coefficient.

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