Image analysis – Histogram processing – For setting a threshold
Patent
1991-07-19
1993-02-16
Razavi, Michael T.
Image analysis
Histogram processing
For setting a threshold
356 19, G06K 974
Patent
active
051877481
ABSTRACT:
An optical apparatus for a fingerprint identification system having a multi-LED for emitting a light, a prism having a slant surface to which a fingerprint being identified is contacted and in which the incident light is absorbed at each ridge but reflected at each valley of the fingerprint, a cover glass functioning as a partial reflecting glass adapted to partially relfect the beam representing a fingerprint image reflected from the prism, a target adapted for focusing a virtual image of the fingerprint thereon, a magnifying glass for magnifying the fingerprint image partially reflected by the cover glass, thereby allowing the user to easily see the fingerprint image, a producing lens for producing the fingerprint image transmitted through the cover glass, and a CCD camera module for converting the fingerprint image produced by the producing lens into an electric signal. The optical fingerprint identification system enables a user to easily adjust the identifying position of the fingerprint improving the accuracy of the fingerprint identification.
REFERENCES:
patent: 3771129 (1973-11-01), McMahon
patent: 3947128 (1976-03-01), Weinberger et al.
patent: 3975711 (1976-08-01), McMahon
patent: 4053228 (1977-10-01), Schiller
patent: 4455083 (1984-06-01), Elmes
Goldstar, Inc.
Jung Yon
Razavi Michael T.
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