用阴极射线管显示器研究辨色阈值Ⅰ:实验数据及人眼颜色视觉特性分析

Study on Color Discrimination Threshold Using CRT Display Part I: Analysis of Experimental Data and Human Color Vision Characteristics

为了研究人眼在辨色阈值水平上的颜色视觉特性,在阴极射线管(CRT)显示器上显示颜色刺激,采用交叉阶梯法进行心理物理实验,在CIE1976a*-b*平面上分别测得3名色觉正常的观察者在5个CIE基本颜色中心区域的辨色阈值。采用性能因子PF/3讨论观察者的测试精度,并以色度椭圆表示辨色阈值实验结果。通过对实验数据的详细处理和分析表明,在等明度的a*-b*平面上各色区及各颜色方向上人眼的辨色特性是各向异性的,即CIE1976a*-b*平面为非视觉均匀;人眼在5个CIE基本颜色中心区域上红-绿方向的视觉色差尺度均小于黄-蓝方向。本文的实验结果可为均匀颜色空间及其色差公式的改进和发展提供原始数据和参考依据。

In order to research the human color vision characteristics, the color discrimination threshold experiment at the five basic CIE color centers was carried out by a panel of 3 observers with normal color vision on the CIE1976 a^＊-b^＊ plane using CRT-generated color stimuli based on the psychophysical method of interleaved staircase. The observer test accuracy was estimated using performance factor PF/3, and the color discrimination thresholds were represented via chromaticity ellipses. The detailed processing and analysis of the experimental results indicated that the color discrimination characteristics of human eyes were different for individual color regions and color directions in the iso-lightness a^＊-b^＊ plane, and namely the CIE1976 a^＊-b^＊ plane is visually non-uniform. The visual color-difference scale in the red-green direction was generally smaller than that in the yellow-blue one for the five CIE color centers. The experimental data could provide references for the improvement of uniform color space and color-difference formula.