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Optically variable personalized indicia for identification documents

  • US 8,033,477 B2
  • Filed: 04/12/2010
  • Issued: 10/11/2011
  • Est. Priority Date: 12/24/2001
  • Status: Expired due to Fees
First Claim
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1. An identification document comprising:

  • a document layer comprising a material for receiving printing of thermally transferable optically variable pigment;

    a first indicium printed on the document layer, the first indicium being printed to the document layer by a thermally transferred optically variable pigment;

    the first indicium being at least partially overlaid with a second indicium printed to the document layer by a thermally transferred covert pigment,wherein the first and the second indicia are printed on the document layer by;

    disposing a thermally transferable optically variable pigment in a mass transfer panel of a printer ribbon configured for dye diffusion thermal transfer printing or mass transfer printing to form a first layer;

    disposing a thermally transferable covert pigment in the mass transfer panel to form a second layer over the first layer;

    printing the first and second indicia as part of a mass transfer printing process, such that, the second indicium printed in covert pigment at least partially overlays the first indicium printed in optically variable pigment; and

    wherein the first indicium comprises a digital image, the digital image formed by;

    providing an initial image that is to be used as a model to generate the optically variable image, the digital image comprising personalized data;

    detecting edges or boundaries within the digital image, the detected edges or boundaries forming an intermediate image; and

    emphasizing the edges or boundaries within the intermediate image.

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