Biological detecting system and fingerprint collating system emp

Details Biological detecting system and fingerprint collating system emp Biological detecting system and fingerprint collating system emp

1989-09-14

1991-12-31

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

356 71, G06K 900

Patent

active

050778030

ABSTRACT:
A biological detecting system comprising a light source; a condensing optical system for condensing a light beam from the light source and irradiating the surface of a sample to be detected with a spot of light, an imaging optical system for condensing light reflected or scattered by an irradiated portion of the sample and forming an image of the irradiated portion at a predetermined location, and a photodetector arranged at the predetermined location to detect the size of the image of the irradiated portion and output a detection signal indicating the detected size of the image.

REFERENCES:
patent: 4553837 (1985-11-01), Marcus
patent: 4783167 (1988-11-01), Schiller et al.
patent: 4936680 (1990-06-01), Henkes et al.

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