Method and apparatus for determining the color of an object that

Details Method and apparatus for determining the color of an object that Method and apparatus for determining the color of an object that

1993-12-20

1995-06-27

McGraw, Vincent P.

Optics: measuring and testing

By shade or color

Tristimulus examination

356407, 356419, G01N 2127, G01J 351

Patent

active

054284503

ABSTRACT:
A method and apparatus for determining the color of an object which is transparent, diffusing, and absorbent, by illuminating an area of the object by means of a diffuse light flux that is substantially uniform and isotropic, by picking up the light backscattered by a small fraction of the illuminated area of the object by means of an optical system that comprises achromatic doublets and both infrared and ultraviolet filters, together with a diaphragm, and spectrally analyzing said light by means of interference filters and photodetectors. The invention is particularly suitable for determining the color of teeth in the mouth.

REFERENCES:
patent: 3383979 (1968-05-01), Gibson
patent: 3526777 (1970-09-01), Robinson
patent: 4022534 (1977-05-01), Kishner
patent: 4029391 (1977-06-01), French
patent: 4082458 (1978-04-01), Fukui et al.

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