Process for discriminating the color of a surface and apparatus

Details Process for discriminating the color of a surface and apparatus Process for discriminating the color of a surface and apparatus

1999-04-08

2000-12-05

Evans, F. L.

Optics: measuring and testing

By shade or color

Trichromatic examination

356425, 250226, G01J 350

Patent

active

061574538

ABSTRACT:
The invention relates to a process for discriminating the color of a surface, comprising the steps of acquiring at least a colored acquisition surface, comparing the color of a detecting surface with said at least one color previously acquired so that said color can be recognized. In particular, the acquisition step comprises the steps of sequentially illuminating the acquisition surface with each of three light beams corresponding to three primary colors, each of said light beams being generated by a respective emission source supplied with a supply current IR, IG, IB; picking up by means of a light-receiving element the light scattered from the illuminated acquisition surface; generating an electric signal VR, VG, VB proportional to the luminous intensity of the picked-up light, as the acquisition surface is being illuminated with each of the three beams and controlling the supply current IR, IG, IB of the emission sources such that at least two of the electric signals VR, VG, VB generated are identical with each other within a predetermined tolerance margin.

REFERENCES:
patent: 4678338 (1987-07-01), Kitta et al.
patent: 4917500 (1990-04-01), Lugos
patent: 5021645 (1991-06-01), Satula et al.
patent: 5229841 (1993-07-01), Taranowski et al.
patent: 5325386 (1994-06-01), Jewell et al.

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