Method for measuring chromaticity values by a colorimeter
First Claim
1. A method for measuring chromaticity values in a colorimeter, comprising:
- (a) emitting three visible band light of different spectra, S(λ
)* x(λ
)/PM(λ
), S(λ
)* y(λ
)/PM(λ
) and S(λ
)* z(λ
)/PM(λ
) individually on a surface of an object with a multi-band illuminant, wherein the multi-band illuminant comprises a plurality of color light emitting diodes (LEDs) to form the spectra, S(λ
)* x(λ
)/PM(λ
), S(λ
)* y(λ
)/PM(λ
) and S(λ
)* z(λ
)/PM(λ
) individually based on a requested S(λ
) of a certain color temperature;
(b) receiving reflective lights reflected off the surface of the object with a power meter, wherein the power meter is calibrated to perform the function of 683*∫
PM(λ
)dλ
, wherein the reflective lights are with spectra ofR(λ
)*[S(λ
)* x(λ
)/PM(λ
)], R(λ
)*[S(λ
)* y(λ
)]/PM(λ
)] andR(λ
)*[S(λ
)* z(λ
)/PM(λ
)];
(c) computing chromaticity values X, Y, Z of the object based upon a luminous intensity received by the power meter, wherein the power meter receives the reflective lights reflected off the surface of the object; and
(d) obtaining the chromaticity values X, Y, Z that is
1 Assignment
0 Petitions
Accused Products
Abstract
A method measures chromaticity values using a colorimeter to solve the drawbacks of conventional technologies, such as an inaccurate illuminant, the filter of color-matching function being difficult to be deposited and manufactured within a filter mod colorimeter, and using an expensive spectrometer within a spectrum mode colorimeter. The spectrometer and the filter of color-matching function is not needed, and an accurate chromaticity value of an object by using a multi-band illuminant illuminating the object and a power meter. Further, the multi-band illuminant can adjust the illumination condition of a standard illuminator under different color temperatures, and the chromaticity values of the object can be measured under different color temperatures. The accuracy of the measured chromaticity values is up to the level of the spectrum mode colorimeter, and the price is less than the spectrum mode colorimeter.
-
Citations
2 Claims
-
1. A method for measuring chromaticity values in a colorimeter, comprising:
-
(a) emitting three visible band light of different spectra, S(λ
)*x (λ
)/PM(λ
), S(λ
)*y (λ
)/PM(λ
) and S(λ
)*z (λ
)/PM(λ
) individually on a surface of an object with a multi-band illuminant, wherein the multi-band illuminant comprises a plurality of color light emitting diodes (LEDs) to form the spectra, S(λ
)*x (λ
)/PM(λ
), S(λ
)*y (λ
)/PM(λ
) and S(λ
)*z (λ
)/PM(λ
) individually based on a requested S(λ
) of a certain color temperature;(b) receiving reflective lights reflected off the surface of the object with a power meter, wherein the power meter is calibrated to perform the function of 683*∫
PM(λ
)dλ
, wherein the reflective lights are with spectra ofR(λ
)*[S(λ
)*x (λ
)/PM(λ
)], R(λ
)*[S(λ
)*y (λ
)]/PM(λ
)] andR(λ
)*[S(λ
)*z (λ
)/PM(λ
)];(c) computing chromaticity values X, Y, Z of the object based upon a luminous intensity received by the power meter, wherein the power meter receives the reflective lights reflected off the surface of the object; and (d) obtaining the chromaticity values X, Y, Z that is - View Dependent Claims (2)
-
Specification
-
- Resources
-
Current AssigneeNational Central University
-
Original AssigneeNational Central University
-
InventorsYang, Tsung-Hsun, Lin, Wei-Ping
-
Primary Examiner(s)Chowdhury; Tarifur
-
Assistant Examiner(s)Pajoohi; Tara S
-
Application NumberUS11/874,994Publication NumberTime in Patent Office1,229 DaysField of Search356/243.5, 356/402, 356/405, 356/406, 356/407US Class Current356/407CPC Class CodesG01J 3/50 using electric radiation de...G01J 3/501 Colorimeters using spectral...G01N 21/25 Colour; Spectral properties...
