Method For Measuring Chroma Value By a Colorimeter
First Claim
1. A method for measuring chroma value by a calorimeter, comprising the steps of:
- (a) illuminating on the surface of an object with a multi-band illuminant, and wherein the multi-band illuminant comprises a plurality of single wavelength lights which is distributed in the visible light band and the multi-band illuminant individually make a plurality of different spectrum illuminants, S(λ
)*x(λ
), S(λ
)*y(λ
) and S(λ
)*z(λ
);
(b) forming a reflective light which reflect form an illuminating light on the surface of the object, and wherein the reflective light passes through a power meter within the colorimeter;
(c) computing an chroma value of the object by the luminous intensity which is received by the power meter, wherein the distributed spectrum illuminants, S(λ
)*x(λ
), S(λ
)*y(λ
) and S(λ
)*z(λ
), from the multi-band illuminant illuminate on the object in turn, and to be received by the multi-band power meter after times the reflectance of the object R(λ
), that is the same as integration, then the X, Y, Z data are obtained, and owing to considering a frequency response of the power meter on every wavelength, multi-band illuminant is used for forming the distributed spectrum illuminants individually, S(λ
)*x(λ
)/PM(λ
), S(λ
)*y(λ
)/PM(λ
) and S(λ
)*z(λ
)/PM(λ
), that is
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Abstract
A method for measuring chroma value by colorimeter to solve the drawbacks of conventional technologies, such as an inaccurate illuminant and the filter of color-matching function is difficult to be deposited and manufactured within an filter mod colorimeter, and an expensive spectrometer used within an spectrum mode calorimeter. The present invention does not need the spectrometer and the filter of color-matching function, and can measure an accurate chroma value of an object by using a multi-band illuminant illuminating the object and a power meter. Besides, the multi-band illuminant can be adjusted the illumination condition of standard illuminator under different color temperature, and measure the chroma value of the object under different color temperature. The accuracy of the measured chroma value is up to the level of the spectrum mode colorimeter, and the price is cheaper than the spectrum mode calorimeter.
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Citations
6 Claims
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1. A method for measuring chroma value by a calorimeter, comprising the steps of:
-
(a) illuminating on the surface of an object with a multi-band illuminant, and wherein the multi-band illuminant comprises a plurality of single wavelength lights which is distributed in the visible light band and the multi-band illuminant individually make a plurality of different spectrum illuminants, S(λ
)*x(λ
), S(λ
)*y(λ
) and S(λ
)*z(λ
);(b) forming a reflective light which reflect form an illuminating light on the surface of the object, and wherein the reflective light passes through a power meter within the colorimeter; (c) computing an chroma value of the object by the luminous intensity which is received by the power meter, wherein the distributed spectrum illuminants, S(λ
)*x(λ
), S(λ
)*y(λ
) and S(λ
)*z(λ
), from the multi-band illuminant illuminate on the object in turn, and to be received by the multi-band power meter after times the reflectance of the object R(λ
), that is the same as integration, then the X, Y, Z data are obtained, and owing to considering a frequency response of the power meter on every wavelength, multi-band illuminant is used for forming the distributed spectrum illuminants individually, S(λ
)*x(λ
)/PM(λ
), S(λ
)*y(λ
)/PM(λ
) and S(λ
)*z(λ
)/PM(λ
), that is - View Dependent Claims (2, 3, 4, 5, 6)
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Specification
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- Resources
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Current AssigneeNational Central University
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Original AssigneeNational Central University
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InventorsYang, Tsung-Hsun, Lin, Wei-Ping
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Granted Patent
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Time in Patent OfficeDays
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Field of Search
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US Class Current356/51
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CPC Class CodesG01J 3/50 using electric radiation de...G01J 3/501 Colorimeters using spectral...G01N 21/25 Colour; Spectral properties...
