Method of enhancing the resolution of a fingerprint image in a f

Details Method of enhancing the resolution of a fingerprint image in a f Method of enhancing the resolution of a fingerprint image in a f

1988-11-09

1990-04-17

Dees, Jose

Radiation imagery chemistry: process, composition, or product th

Luminescent imaging

430395, 427 1, G03C 516, A61B 510

Patent

active

049179870

ABSTRACT:
A method for enhancing fingerprint images comprises the steps of applying a chemical compound to the fingers to be printed in which the compound contains a first constituent in the form of a conventional ink or inkless reagent. The first constituent is arranged by itself (i.e., ink) or in conjunction with a developer (i.e., inkless) to provide a visible image of a fingerprint when applied to a porous surface, such as a conventional fingerprint card under light within the visible spectrum. A second constituent is included in the compound which is arranged to fluoresce within the visible spectrum (i.e., 500 to 650 nm) when subject to U.V. radiation, preferably centered at 550 nm.
The compound from the fingers is then deposited onto a porous surface and a visible image is formed therefrom representing the ridge patterns of the fingers. The surface is then illuminated with visible and ultraviolet light and the fluorescence of the second constituent enhances the brightness of the image. The image is focused onto a photosensitive surface (e.g., video camera tube or photographic film) having a maximum sensitivity to light within the yellowish-green spectrum and the image is converted into information representative of the ridge patterns of the fingers (e.g., by computer or development of the film.

REFERENCES:
patent: 2066535 (1937-01-01), Lucas
patent: 4176205 (1979-11-01), Molina
patent: 4504408 (1985-03-01), Morton
patent: 4708882 (1987-11-01), Asano et al.

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