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Fingerprint scanning device for use in identification

  • US 5,426,708 A
  • Filed: 06/11/1993
  • Issued: 06/20/1995
  • Est. Priority Date: 08/06/1992
  • Status: Expired due to Term
First Claim
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1. A fingerprint scanning device for use in identification comprising:

  • a fingerprint image input means adapted to photoelectronically input a specified fingerprint of an entrant, and storing two-dimensional monochrome image data of a ridge pattern of the entrant fingerprint as fingerprint image data;

    a feature extraction means having a calculator which treats the ridge pattern image with one-dimensional group-delay spectrum transform in X- and Y-directions which has a characteristic of isolating and emphasizing peaks of the individual frequency spectra in the form of differential with respect to a phase component frequency in Fourier transform analysis, and determining group-delay spectra in X- and Y-directions, respectively, as fingerprint feature portions; and

    a distinction means provided to collate the entrant feature portion with a registrant feature position which is registered by the fingerprint image input means so as to identify the entrant with the registrant when at least one of X-oriented and Y-oriented group-delay spectra is recognized to be the same between the entrant and the registrant by calculating whether Euclidean distances fall short of a predetermined threshold limit upon collating the individual ridge pattern image.

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