Fingerprint recognition device using a hologram

Details Fingerprint recognition device using a hologram Fingerprint recognition device using a hologram

1990-11-13

1992-04-28

Moore, David K.

Image analysis

Histogram processing

For setting a threshold

382 31, 356348, 359 15, 359561, G06K 900

Patent

active

051094274

ABSTRACT:
A fingerprint recognition device is disclosed which is capable of making a more definite fingerprint recognition by using a hologram. The device includes a laser for emitting light, a collimator for making the light travel in parallel, and a tetragonal prism for forming a fingerprint image on it all of which are arranged along the first optical axis. A hologram is provided for shifting the position of the fingerprint image to a second optical axis, an image-forming lens for forming the fingerprint image, and an area CCD for converting the fingerprint image to electrical signals are arranged along the second optical axis. The area CCD is connected to a circuit which amplifies and analyzes the electrical signals. Accordingly, a virtual image of a fingerprint is shifted onto the optical axis of the image-forming lens by the hologram so as to be formed as a virtual image, the virtual image is formed on the area CCD by the image-forming lens to generate electrical signals according to the fingerprint image. The electrical signals are transferred to the circuit which amplifies and analyzes the signals, and then the fingerprint is recognized.

REFERENCES:
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patent: 3799643 (1974-03-01), Mailer
patent: 4174179 (1979-11-01), Tschudi et al.
patent: 4681435 (1987-07-01), Kubota et al.
patent: 4785171 (1988-11-01), Dowling, Jr. et al.
patent: 4876725 (1989-10-01), Tomko
patent: 4925300 (1990-05-01), Rachlin

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