Color discrimination data input apparatus

Details Color discrimination data input apparatus Color discrimination data input apparatus

1991-03-12

1993-06-22

Evans, F. L.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

356310, 356330, 356328, 356416, 356419, 364526, G01J 328, G01N 2125

Patent

active

052219593

ABSTRACT:
A color discrimination data input apparatus includes a light source for generating illumination light for illuminating a target object, a spectroscope for producing a spectrum having a plurality of spectral components, a color classification filter set to have a light-transmitting characteristic to pass only a light component having a wavelength range suitable for classification from the spectral components generated by the spectroscope in order to classify the spectral components reflected by the target object into predetermined classes, a photoelectric converting circuit for converting a reflected spectral component, upon radiation of the spectral component passing through the color classification filter on the target object, into an electrical signal, classifying circuit for classifying the reflected spectral components in accordance with the electrical signal output from the photoelectric converting circuit, the color estimating circuit of estimating a color of the target object from the reflected spectral component classified into any one of the classes by the classifying circuit on the basis of a preset absolute color estimation matrix, and an output unit for outputting a classification result obtained from the classifying circuit and an object color measurement result output from the color estimating circuit.

REFERENCES:
patent: 4193691 (1980-03-01), Fjarlie
patent: 4790654 (1988-12-01), Clarke
Article entitled "Color Recognition Systems" By Timo Jaaskelainen, published in the Japanese Journal of Optics, vol. 18, 1989.
Article entitled An Optimal Set of Discriminant Vectors By Donald H. Foley, et al, published in IEEE Transactions on Computers, vol. C-24, No. 3, Mar. 1975, pp. 281-289.
Article entitled Optical Implementation Of The Hotelling Trace Criterion For Image Classification By Zu-Han Gu, et al, published in Optical Engineering, vol. 23, No. 6, Nov.-Dec. 1984, pp. 727-731.
Article entitled Color Representation Using Statistical Pattern Recognition, J. Parkkinen, et al, published Applied Optics, vol. 26, No. 19, Oct. 1, 1987, pp. 4240-4245.
Article entitled "Color Recognition Systems" By Timo Jaaskelainen, published in Laboratory of Applied Physics, Faculty of Engineering, Saitama University and received Aug. 30, 1988.

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