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Apparatus and method for matching image characteristics such as fingerprint minutiae

  • US 4,896,363 A
  • Filed: 04/24/1989
  • Issued: 01/23/1990
  • Est. Priority Date: 05/28/1987
  • Status: Expired due to Term
First Claim
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1. A method of matching a live image and a master image having any random or nonrandom distribution of characteristic features throughout an image, comprising the steps of:

  • generating a set of points representative of the characteristic features of the live image;

    generating a set of points representative of the characteristic features of the master image; and

    evaluating the match between the live characteristic points and the master characteristic points, said step of evaluating consisting essentially of the further steps of;

    deriving the distances between a plurality of pairs of the live characteristic points;

    deriving the distances between a plurality of pairs of the master characteristic points; and

    comparing the live distances with the master distances to determine whether of not the live image matches the master image;

    wherein the steps of deriving the distances between pairs of the live characteristic points and deriving the distances between pairs of the master characteristic points comprise for each such step the step of forming, for each point in the set of points, a spectrum of values representing the distances between the point and each other point in the set of points.

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