Image analysis – Histogram processing – For setting a threshold
Patent
1981-07-30
1984-01-31
Boudreau, Leo H.
Image analysis
Histogram processing
For setting a threshold
324 711, 382 68, G06K 928
Patent
active
044294131
ABSTRACT:
A fingerprint sensor for transforming the topological pattern of a finger into an electric output signal. The sensor includes an array of cells arranged beneath a contact surface for sensing the pressure and/or temperature variations existing at the surface as a result of a fingerprint pressed against it. Each cell includes a transistor set to operate at a point within its amplification range. This operating point is varied in dependence upon the pressure and/or temperature at the adjacent contact surface. A circuit is provided to measure the amount of current passing through the transistor in each cell and to derive an electrical output signal therefrom.
REFERENCES:
patent: 3622989 (1971-11-01), Dowdy
patent: 3781855 (1973-12-01), Killen
patent: 3993888 (1976-11-01), Fellman
patent: 4053228 (1977-10-01), Schiller
patent: 4189749 (1980-02-01), Hiroshima et al.
patent: 4353056 (1982-10-01), Tsikos
Preliminary Date Sheet "Solid State Image Sensor Array RA100.times.100" to EG & G Reticon (3-10-80).
"Solid-State Imagers With Integrated Fixed-Pattern Noise Suppression" to Koch et al., Siemens Forsch.-u Entwickl.-Ber. Bd 8 (1979), Nr. 5.
"Vibrit-Piezokeramik von Siemens" Datenblatt-Stand Nov. 1980.
Boudreau Leo H.
Milde Jr. Karl F.
Siemens Corporation
LandOfFree
Fingerprint sensor does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Fingerprint sensor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Fingerprint sensor will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2349802