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Methods and systems for watermark processing of line art images

  • US 6,567,534 B1
  • Filed: 07/27/2000
  • Issued: 05/20/2003
  • Est. Priority Date: 05/08/1995
  • Status: Expired due to Fees
First Claim
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1. A method of embedding binary data in a banknote, comprising:

  • providing nominal line art for the banknote;

    imposing a virtual grid of points over at least an excerpt of said line art, each of said points having a region associated therewith; and

    changing a luminance value of plural of said regions to embed binary data therein, wherein said changes are not apparent to a human viewer of the banknote, yet can be detected from visible light scan data corresponding to said banknote.

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