Optics: measuring and testing – By shade or color – Tristimulus examination
Patent
1986-12-16
1988-09-27
LaRoche, Eugene R.
Optics: measuring and testing
By shade or color
Tristimulus examination
356416, 36457104, G01N 2125
Patent
active
047737611
ABSTRACT:
A photoelectric colorimeter which comprises a photoelectric conversion section including an optical filter to analyze light coming from a test piece and a reference calibrating sample into primary color elements, and a photosensor to convert each of said primary color elements into an electric signal; and a data processing section including a calibration constant calculating device for calculating a calibration constant for each of a plurality of reference calibrating samples on the basis of a calibration point of each of the reference calibrating samples and an information inputted from said photoelectric conversion section, a chromaticity point calculation device for calculating a chromaticity point of the test piece and that of each reference calibrating sample, a memory device for memorizing the calibration constant and calibration point of each of the reference calibrating samples, a device for estimating a new calibration constant suitable for the chromaticity point of the test piece between the respective calibration constants of the reference calibrating samples through the interpolation using a positional relation between the chromaticity point of the calibration point and that of the test piece as a parameter, and a correction device for correcting measured value of the test piece by the new calibration constant.
REFERENCES:
patent: 4055813 (1977-10-01), French
patent: 4125329 (1978-11-01), French et al.
patent: 4165180 (1979-08-01), Failes
patent: 4350441 (1982-09-01), Wicnienski
patent: 4654794 (1987-03-01), O'Brien
Sugiyama Masami
Tasaka Yoshihiro
Ham Seung
LaRoche Eugene R.
Minolta Camera Kabushiki Kaisha
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