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Robust digital watermarking

  • US 6,738,493 B1
  • Filed: 04/26/2000
  • Issued: 05/18/2004
  • Est. Priority Date: 06/24/1998
  • Status: Expired due to Term
First Claim
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1. A method of detecting a watermark from watermarked data comprising the steps of:

  • receiving watermarked data where the watermarked data comprises n×

    n blocks of watermarked data;

    summing the n×

    n blocks of watermarked data to form at least one n×

    n block of summed watermarked data;

    cyclically shifting the block in the spatial domain to register the block, and extracting the watermark from the at least one n×

    n block.

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