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Personal identification devices and access control systems

  • US 5,608,387 A
  • Filed: 05/26/1994
  • Issued: 03/04/1997
  • Est. Priority Date: 11/30/1991
  • Status: Expired due to Term
First Claim
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1. A personal identification device comprising a store of personal identity statements and a store of complex images including key complex images linked with personal identity statements and false complex images not associated with personal identity statements, a complex image being an image that is recognizable when already known but not readily capable of unique description to a person to whom it is not known so that when a particular complex image is included in a set of similar but not identical complex images, the particular complex image is distinguishable from other complex images in the set, by the human senses of a person familiar with the particular complex image, within a predetermined time interval when the whole set is displayed, but it is not readily possible to describe the particular complex image in terms which are sufficiently precise that another human being unfamiliar with the particular complex image can subsequently identify it among other complex images of the set using normal unaided human senses to discern the particular image, and within a time interval similar to the predetermined time interval, and provided that reference to and comparison with other complex images of the displayed set is not permitted as part of a description.

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