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Anti-counterfeiting method and apparatus using digital screening

  • US 6,104,812 A
  • Filed: 01/12/1998
  • Issued: 08/15/2000
  • Est. Priority Date: 01/12/1998
  • Status: Expired due to Term
First Claim
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1. A method as implemented on a computer system for digitally producing encoded screens for incorporating secondary information composed of pixels as an anti-counterfeiting security feature into a visible primary image for use on a document, the method comprising the steps of:

  • (a) providing a user selected basic screen;

    (b) creating an encoded screen from the user selected basic screen and the secondary information by;

    (1) using the pixels as digital information carriers,(2) modifying a parameter of the digital information carriers, and(3) placing the modified parameter of the digital information carriers within a plurality of color layers of the primary image based on the secondary information,(c) generating a compensated screen containing the secondary information hidden within by compensating the encoded screen for any distortions;

    (d) screening the primary image with the compensated screen to produce a combined output image in accordance with a reproduction technology corresponding to the user selected encoding principle; and

    (e) reproducing the document using the reproduction technology, the document incorporating the combined output image.

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