Image analysis – Applications – Personnel identification
Patent
1993-06-11
1995-06-20
Mancuso, Joseph
Image analysis
Applications
Personnel identification
356 71, G06K 974, G06K 900
Patent
active
054267080
ABSTRACT:
In a fingerprint scanning device for use in identification, a fingerprint image input device is provided to photoelectronically input a specified fingerprint of an entrant. A monochrome image data of the ridge pattern of the entrant fingerprint is stored as fingerprint image data. A feature extraction device has a calculator which treats the ridge pattern image with one-dimensional group-delay spectrum transform in X- and Y-directions. The feature extraction device has the 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-direction respectively as fingerprint feature portions. A distinction device is provided to collate the entrant feature portion with a registrant feature portion which is registered by the fingerprint image input means so as to identify the entrant with the registrant when X-oriented and Y-oriented group-delay spectra are recognized as being 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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Hamada Toshio
Umezaki Taizo
Chuo Hatsujo Kabushiki Kaisha
Fox David
Mancuso Joseph
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