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Electronic watermarking in the compressed domain utilizing perceptual coding

  • US 6,493,457 B1
  • Filed: 11/16/1998
  • Issued: 12/10/2002
  • Est. Priority Date: 12/03/1997
  • Status: Expired due to Term
First Claim
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1. A perceptual coder for encoding at least one compressed audio or video signal to include hidden data, comprising, in combination:

  • means for setting quantization step sizes to obtain a set of integer values after quantization of said at least one compressed signal, said means for setting step sizes employing at least one perceptual technique;

    means for adding the hidden data to said at least one compressed signal;

    means for quantizing said at least one compressed signal; and

    means for selecting a set of multipliers during the quantization, said adding of the hidden data occurring during the quantization.

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