Optics: measuring and testing – Document pattern analysis or verification
Patent
1991-07-26
1992-12-29
McGraw, Vincent P.
Optics: measuring and testing
Document pattern analysis or verification
G06K 920
Patent
active
051755939
ABSTRACT:
A fingerprint photographing system comprising: a prism having a detection surface where a finger is pressed thereon; a luminous source for irradiating light to the detection surface; a camera for detecting the light reflected upon the detection surface; and means for comparing the image before and after the finger is pressed upon the detection surface and for storing the image of fingerprint to a memory when the number of pixels of the image with a predetermined density difference is in the range of predetermined number.
REFERENCES:
patent: 4832485 (1989-05-01), Bowles
patent: 5074661 (1991-12-01), Reynolds et al.
Matsuura et al., "A Method for Fingerprint Image Enhancement Using the Ridge Direction", The Transactions of the Institute of Electronics, Information and Communication Engineers, 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, vol. J72-D-II, No. 5, pp. 707-714, May 1989.
Hoshino et al., "Automated Fingerprint Identification by Minutianetwork Feature-Matching Processes-", The Transactions . . . of Electronics, Infor. & Communication Engineers, vol. J72-D-II, No. 5, pp. 733-740, May 1989.
Asai et al., "Automated Fingerprint Identification by Minutia-Network Extraction Process", The Transactions . . . Electronics, Information . . . Engineers, vol. J72-D-II, No. 5, pp. 724-732, May 1989.
"Algorithm of Fingerprint Verification System", Nikkei Electronics, Jan. 1989 (No. 464).
Kumagai Ryohei
Maruta Kazuo
Ezel Inc.
McGraw Vincent P.
Sharp Corporation
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