用阴极射线管显示器研究辨色阈值Ⅱ:典型色差公式评价

利用由辨色阈值实验得到的CIELAB颜色空间中等明度a*-b*平面上的视觉数据,对四个典型色差公式CIELAB、CMC、CIE94和CIEDE2000在辨色阈值水平上的色差预测性能进行测试和评价,并采用性能因子PF/3来表示各色差公式的优劣。对于原始形式(kC=kH=1)的色差公式,CIEDE2000的色差预测性能最好,其次为CIE94和CMC,CIELAB最差。采用对kC和kH进行优化后的色差公式,CIEDE2000的色差预测性能依然最佳,其余三个色差公式的预测性能基本相同;除了CIELAB明显改善外,其他公式的色差预测性能只比原始形式略有提高。色差公式CIEDE2000在黄色和蓝色区域的色差预测性能表现优异,但在灰色、红色和绿色区域的预测性能仍有待进一步改进。

Study of Color Discrimination Threshold Using CRT Display. Part Ⅱ : Evaluation of Classical Color-Difference Formulae

The visual data obtained from the color discrimination threshold experiment carried out in the iso-lightness a*-b* plane of CIELAB color space were used to test the four classical color-difference formulae,CIELAB,CMC,CIE94 and CIEDE2000,in terms of performance factor PF/3.For the original forms(kC=kH=1),CIEDE2000 outperformed others,followed by CIE94 and CMC,with CIELAB the worst.For the color-difference formulae with kC and kH optimized,CIEDE2000 still performed the best,while the color-difference prediction performances of other three formulae were almost the same;except for CIELAB improved obviously,others were enhanced a little in comparison with their individual original forms.The CIEDE2000 formula performed excellently in the yellow and blue color regions,but its color-difference prediction performances in the gray,red and green regions remained to be further improved.