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Identification document and related methods

  • US 20070016790A1
  • Filed: 09/25/2006
  • Published: 01/18/2007
  • Est. Priority Date: 11/19/1998
  • Status: Active Grant
First Claim
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1. A security document comprising:

  • a substrate;

    a first graphic carried by the substrate, the first graphic conveying a photographic image to human viewers thereof, the first graphic being steganographically encoded to convey first plural bits of data recoverable by computer analysis of said first graphic; and

    a second graphic carried by the substrate, the second graphic conveying a visual image to human viewers thereof, wherein the second graphic is steganographically encoded to convey second plural bits of data recoverable by computer analysis of said second graphic; and

    wherein the steganographically encoded first plural bits of data and the steganographically encoded second plural bits of data cooperate to evidence authenticity of the security document.

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