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Method of extracting digital watermark information and method of judging bit value of digital watermark information

  • US 6,970,575 B2
  • Filed: 09/22/2003
  • Issued: 11/29/2005
  • Est. Priority Date: 09/02/1999
  • Status: Expired due to Fees
First Claim
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1. A digital watermark information extracting method in which digital watermark information is extracted from image data which has the digital watermark information embedded therein by altering at least one pixel data located at a predetermined position on a specific coordinate and is geometrically deformed. comprising:

  • an embedding position check step of performing the processing of extracting at least one pixel data at a predetermined position on the specific coordinate from the image data, obtaining difference between a data value of the pixel data thus extracted and a reference value, and outputting a bit value of the pixel data thus extracted which is judged from the difference and reliability of the bit value thus judged to judge whether the information is embedded in the pixel data while applying the geometrical deformation on the image data until it is confirmed that the reliability is higher than a predetermined value.

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