Image analysis – Applications – Personnel identification
Patent
1992-12-10
1997-03-11
Boudreau, Leo
Image analysis
Applications
Personnel identification
382168, 382294, G06K 900
Patent
active
056109938
ABSTRACT:
An image positioning method for co-centering two images including ridges with each other, first a density value of each pixel of an image to be examined and a reference image are calculated. A change of density value between pixels in neighborhoods along the first and the second directions of each pixel of the image to be examined and the reference image are determined and a histogram of density change along the first and second directions of the image to be examined and the reference image is also determined. A maximum or minimum point of the histogram of the first and second directions is determined as a characteristic point of the image to be examined and the reference image. The image to be examined and the reference image are determined to fit when the characteristic points coincide with each other.
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patent: 4827527 (1989-05-01), Morita et al.
patent: 5040224 (1991-08-01), Hara
Matsuura et al., "A Method for Fingerprint Image Enhancement Using the Ridge Direction", The Transactions of the Institute of Electronics, Information and Communication Engineers, D-II, vol. J72-D-II, No. 2, pp. 302-306, Feb. 1989.
Sasakawa et al., "Personal Verification System With High Tolerance of Poor Quality Fingerprints", The Transactions of the Institute of Electronics, Information and Communication Engineers, D-II, vol. J72-D-II, No. 5, pp. 707-714, May 1989.
Asai et al. "Automated Fingerprint Identification by Minutia-Network Feature--Matching Processes-", The Transactions of the Institute of Electronics, Information and Communication Engineers, D-II, vol. J72-D-II, No. 5, pp. 733-740, May 1989.
Asai et al., "Automated Fingerprint Identification by Minutia-Network Feature--Feature Extraction Process-", The Transactions of the Institute of Electronics, Information and Communication Engineers, D-II, vol. J72-D-II, No. 5, pp. 724-732, May 1989.
"Algorithm of Fingerprint Verification System", Nikkei Electronics, Jan. 9, 1989 (No. 464).
Boudreau Leo
Johns Andrew W.
Yozan Inc.
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