Image analysis – Applications – Personnel identification
Patent
1997-10-29
2000-05-09
Mehta, Bhavesh
Image analysis
Applications
Personnel identification
G06K 900
Patent
active
060614641
ABSTRACT:
A fingerprint-reading system including a sensor on which a finger, whose imprint is to be read, is pressed. The sensor has an active surface of elements sensitive to variations in temperature and integrated heating resistors that create a transient variation in the temperature of the sensitive elements thereby to generate temporary charges in each element when pressed by a finger. The charges are output in synchronism with creation of the transient variations in the temperature of the sensitive elements to provide stable images of the fingerprint which may be motionless. The output of the sensor enables real-time display of the fingerprint images and processing of authentication data. The heating resistor enables the sensor to produce stable images of a fingerprint by producing an internal excitation to offset the tendency of electrical charges, induced by variations of the physical temperature of the finger, from disappearing because the temperature of the finger has reached equilibrium.
REFERENCES:
patent: 4353056 (1982-10-01), Tsikos
patent: 4358677 (1982-11-01), Ruell et al.
patent: 4394773 (1983-07-01), Ruell
patent: 4429413 (1984-01-01), Edwards
patent: 4577345 (1986-03-01), Abramov
patent: 4582985 (1986-04-01), Lofberg
"Thomson-CSF"
Mehta Bhavesh
LandOfFree
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