用异谱反射色检验CIE颜色匹配函数的表现

Performance of CIE Color Matching Functions Tested by Metamerism Reflected Samples

为测试CIE推荐各颜色匹配函数(CMFs)CIE1931、CIE1964和CIE2006的计算性能,首先使用前期研究中两组基于配对比较法实验采集到的年轻和老年观察者异谱反射色色差比较数据,检验了CIE现有各CMFs的表现。研究发现CIE2006(22,4°)和CIE1931 2°的计算色差ΔE;分别与56名年轻和40名老年观察者的目视色差ΔV间的STRESS值最小,一致性最好。在RAL K5色卡中选择了明度值L;在34.4~71.6范围内的5个不同非彩色作为目标色,使用Epson喷墨打印机围绕每个目标色分别制作了16个异谱样本。组织了26名年轻观察者基于灰梯尺法进行80对样本的色差比较,结果表明目视色差ΔV与CIE2006(22,2°)CMFs的计算色差ΔE;间STRESS值最小。本次实验的观察视场为8.17°×16.26°,现有CIE2006 CMFs在大视场下对异谱反射色间色差的计算性能还需要进一步改进。

In order to test the performances of CIE recommended color matching functions, including CIE1931, CIE1964, and CIE2006, the visual color differences from young and aged observers in the previous study based on paired-comparison experiments are used to test the performances of CMFs. The results indicate that CIE2006(22, 4°) and CIE1931 2° are recommended for young and aged observers with the minimum STRESS values, with the most consistent of the calculated color difference ΔE;and the visual color difference ΔV of 56 young observers and 40 old observers, respectively. Further, we selected five neutral target colors from RAL K5 color chart with the L;values ranging from 34.4--71.6, and 16 metamerism samples were prepared by the Epson inkjet printer around each target color sample. The target and compared samples were metamerism sample pairs. 26 young observers were organized to carry out the color difference experiment of the 80 sample pairs with the gray scale method. The results indicate that the computed color differences ΔE;from CIE 2006(22,2°) CMFs are accorded with the visual color difference ΔV with the minimum STRESS values, with the observation field of 8.17°×16.26°. The existing CIE2006 CMFs are needed to improve in the calculation of large field of view in consideration of the color difference of metamerism reflected samples.