Method and apparatus for sensing color of articles

Details Method and apparatus for sensing color of articles Method and apparatus for sensing color of articles

1993-06-07

1996-02-20

Hille, Rolf

Optics: measuring and testing

By shade or color

356407, 356237, 250226, G01N 2127, G01N 2189

Patent

active

054934044

ABSTRACT:
Method and apparatus for sensing the color of articles wherein a first pair of wavelengths is selected on a plurality of light reflection curves in terms of reflected light wavelength spectrum, these curves being associated with a plurality of articles constituting a sample representative of the color range to be sensed. The first pair of wavelengths delimits a first range of wavelengths corresponding to light reflection values in these curves, the light reflection values in each of the curves being in a substantially linear relationship over said first range of wavelengths. Each article to be inspected is illuminated with light comprising the first pair of wavelengths, and the light reflected therefrom is measured to detect light reflection values corresponding to the first pair of wavelengths. A primary signal is produced which represents a resulting difference between said detected light reflection values, this signal being indicative of the color of the inspected article.

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