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Access control systems

  • US 7,958,359 B2
  • Filed: 04/30/2001
  • Issued: 06/07/2011
  • Est. Priority Date: 04/30/2001
  • Status: Active Grant
First Claim
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1. A method comprising:

  • receiving optical data from an optical sensor, the optical data being associated with an object presented to the optical sensor, wherein the object comprises optically-detectable, machine-readable indicia encoded using digital watermarking, said indicia comprising an orientation component and an identifier;

    determining, at a electronic processor a series of orientations of the orientation component;

    transmitting the identifier to a server;

    receiving a series of expected orientations based on the identifier;

    comparing the series of expected orientations with the determined series of orientations; and

    determining an access status based on the comparison.

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