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Adaptive dictionary for a fingerprint recognizer

  • US 5,210,797 A
  • Filed: 10/29/1990
  • Issued: 05/11/1993
  • Est. Priority Date: 10/30/1989
  • Status: Expired due to Term
First Claim
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1. A method for fingerprint recognition including a registration means having a write mode and a read mode comprising the steps of:

  • receiving an initial fingerprint pattern of light beams reflected on a surface of a finger;

    storing said initial fingerprint pattern in a first storage area of a plurality of storage areas within a memory when said registration means is in the write mode;

    receiving a second fingerprint pattern of light beams reflected on the surface of the finger when said registration means is in the read mode;

    comparing segments of fingerprint pattern already stored with segments of the second fingerprint pattern when said registration switch is in the read mode;

    providing a correspondence signal when at least a predetermined number of segments correspond;

    storing said segments of the second fingerprint pattern in a second storage area of the memory;

    computing the number of occurrences of correspondence between the segments of fingerprint pattern stored in the memory and the segments of the second fingerprint pattern;

    receiving a third fingerprint pattern of light beams reflected on the surface of the finger when said registration switch is in the read mode;

    comparing the segments of fingerprint pattern already stored in the storage areas of the memory with segments of the third fingerprint pattern;

    providing a correspondence signal when at least a predetermined number of segments correspond; and

    storing the third fingerprint pattern in the memory in place of a fingerprint pattern with the lowest number of occurrences of correspondence among the fingerprint patterns already stored in the registration areas of the memory whereby all of the storage areas store different fingerprint patterns.

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