Method and apparatus for determining the color of a translucent

Details Method and apparatus for determining the color of a translucent Method and apparatus for determining the color of a translucent

1992-12-15

1995-01-17

Evans, F. L.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

356405, 356407, 356425, G01J 350

Patent

active

053830202

ABSTRACT:
The invention relates to a method and to apparatus for determining the color of a translucent object such as a tooth by measuring the reflectance of said object at wavelengths corresponding essentially to sensitivity maxima of the human eye to hue and to saturation, by calculating the luminance of white included in the luminance of the object illuminated by a determined standard illuminant, by calculating a saturation percentage for the color of the object as seen by the human eye, and by determining the pigmentations of said color relative to white.

REFERENCES:
patent: 3986777 (1976-10-01), Roll
patent: 4654794 (1987-03-01), O'Brien
patent: 4836674 (1989-06-01), Leguime et al.
patent: 4881811 (1989-11-01), O'Brien

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