Image analysis – Applications – Personnel identification
Patent
1996-11-08
1998-11-03
Moore, David K.
Image analysis
Applications
Personnel identification
382115, 382168, G06K 900
Patent
active
058321020
ABSTRACT:
In order to extract position and direction of the first joint line of a fingerprint for stable pattern positioning in fingerprint comparison, an apparatus for extracting fingerprint features comprises a vertical strip divider (11) for dividing digitized data of a fingerprint into data of a plurality of strips with straight lines parallel to a y direction; a projection calculator (12) for obtaining histograms, each of said histograms calculated by accumulating pixel values of each of said plurality of strips in an x direction perpendicular to said y direction; a valley candidate calculator (13) for detecting candidate valleys from said histograms, one of said histograms having a locally minimum value at each of said candidate valleys; and a valley information integrator (116) for calculating a position of a joint line of said fingerprint from positional information of said candidate valleys detected by said valley candidate calculator (13).
REFERENCES:
patent: 4394683 (1983-07-01), Liptay-Wagner et al.
patent: 5359672 (1994-10-01), Okumura et al.
Teruo Akiyama et al., "Automated Entry System For Printed Documents", Recognition, vol. 23, No. 11, 1990, pp. 1141-1154.
M. Takeda et al., "Finger Image Identification Method for Personal Vertification", 10th Int. conf. on Pattern Recognition, Jun. 1990, pp. 761-766.
R.O. Duda et al., "Use of the Hough Transformation to Detect Lines and Curves in Pictures", Communications of the ACM Association For Computer Machinery, vol. 15, No. 1, Jan. 1972, pp. 11-15.
Chen Wenpeng
Moore David K.
NEC Corporation
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