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Perceptual modeling of media signals based on local contrast and directional edges

  • US 20040136565A1
  • Filed: 10/10/2003
  • Published: 07/15/2004
  • Est. Priority Date: 06/19/2000
  • Status: Active Grant
First Claim
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1. A method of reducing human perceptibility of visible artifacts attributable to embedding a digital watermark in a media signal, said method comprising:

  • determining a contrast measurement for at least some local areas of the media signal;

    adjusting a contrast measurement for a local area if the contrast measurement is above a predetermined level; and

    embedding the digital watermark in the at least some local areas in a manner determined at least in part by their respective contrast measurement.

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