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Method and device for allocating core points of finger prints

  • US 5,140,642 A
  • Filed: 04/23/1991
  • Issued: 08/18/1992
  • Est. Priority Date: 04/23/1991
  • Status: Expired due to Term
First Claim
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1. A method for allocating a core point of a finger print in the form of a binary image constituted by a plurality of windows, comprising the following steps:

  • (1) finding out ridge flows of said finger print--assigning a direction code to each of said windows of the binary image;

    (2) correcting the ridge flows --correcting the direction codes in order to eliminate noises; and

    (3) allocating the core point --allocating the core point in accordance with the corrected direction codes.

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