Image enhancer

Details Image enhancer Image enhancer

1982-09-03

1989-05-23

Willis, Davis L.

Optics: measuring and testing

Document pattern analysis or verification

382 5, G06K 900

Patent

active

048324850

ABSTRACT:
An image enhancer for providing a sharp, contrasting image of a pattern, such as a fingerprint pattern is disclosed. In one embodiment, an image enhancer is comprised of a viscous, opaque liquid interposed between an optical glass window and a reflective elastomeric membrane. Artificial lighting is evenly focused on the underside of the membrane and a sharp fingerprint image of a finger pressing said membrane against the window is produced. The image can be either photographed or focused on a conventional matrix of image sensors or pixels.

REFERENCES:
patent: 3200701 (1965-08-01), White
patent: 3482498 (1969-12-01), Becker
patent: 3865488 (1975-02-01), Del Rio
patent: 4322163 (1982-03-01), Schiller
patent: 4525859 (1985-06-01), Bowles et al.

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