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Volume: 6 | Article ID: art00014
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Four-Color Matrix Method for Correction of Tristimulus Colorimeters – Part 2
Yoshi Ohno
Steven W. Brown
  DOI :  10.2352/CIC.1998.6.1.art00014  Published Online :  January 1998
Abstract

The Four-Color Method was developed to improve the accuracy of tristimulus colorimeters for measurements of color displays. It was verified that the method works well for cathode ray tubes (CRTs). The accuracy of this method has been studied further for spectral variations of displays including CRTs, liquid crystal displays (LCDs) and organic light emitting diode (OLED) displays. A theory for additional photometric (Y) correction is also given. A simulation was conducted using data of actual tristimulus colorimeters and displays having variations in their spectral power distributions. The results show that, if the correction matrix is made with one type of display and other types of display are measured, the error correction will not be effective. If the calibration and measurement is limited to one type of display, the residual errors are found to be within 0.002 in chromaticity x, Y and a color difference of 2 ΔEab. An experiment was also conducted to verify the Four-Color Method for measurements of an LCD. The errors of a colorimeter for 14 colors were reduced to within 0.002 in x, Y and 1 ΔEab. It has been experimentally verified that the method works well for LCDs as well.

Journal Title : Color and Imaging Conference
Publisher Name : Society of Imaging Science and Technology
Publisher Location : 7003 Kilworth Lane, Springfield, VA 22151, USA
Subject Areas :
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 DOI 10.2352/CIC.1998.6.1.art00014
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Yoshi Ohno, Steven W. Brown, "Four-Color Matrix Method for Correction of Tristimulus Colorimeters – Part 2"  in Proc. IS&T 6th Color and Imaging Conf.,  1998,  pp 65 - 68,  https://doi.org/10.2352/CIC.1998.6.1.art00014

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Copyright © Society for Imaging Science and Technology 1998
72010350
Color and Imaging Conference
color imaging conf
2166-9635
Society of Imaging Science and Technology
7003 Kilworth Lane, Springfield, VA 22151, USA
2166-9635(19980101)1998:1L.65;1-
cic_v1998n1/splitsection14.xml
/ist/cic/1998/00001998/00000001/art00014
Articles
Four-Color Matrix Method for Correction of Tristimulus Colorimeters – Part 2
OhnoYoshi
BrownSteven W.
01011998
1998
1
65
68
1998
The Four-Color Method was developed to improve the accuracy of tristimulus colorimeters for measurements of color displays. It was verified that the method works well for cathode ray tubes (CRTs). The accuracy of this method has been studied further for spectral variations of displays including CRTs, liquid crystal displays (LCDs) and organic light emitting diode (OLED) displays. A theory for additional photometric (Y) correction is also given. A simulation was conducted using data of actual tristimulus colorimeters and displays having variations in their spectral power distributions. The results show that, if the correction matrix is made with one type of display and other types of display are measured, the error correction will not be effective. If the calibration and measurement is limited to one type of display, the residual errors are found to be within 0.002 in chromaticity x, Y and a color difference of 2 ΔEab. An experiment was also conducted to verify the Four-Color Method for measurements of an LCD. The errors of a colorimeter for 14 colors were reduced to within 0.002 in x, Y and 1 ΔEab. It has been experimentally verified that the method works well for LCDs as well.