为了研究人眼对反射样品颜色在恰可察觉小色差辨色阈值水平上的颜色视觉特性, 对印在半光相纸上的17个CIE基本颜色中心区域, 约1000对颜色色样, 采用心理物理实验方法中的固定刺激法, 在CIE1976a*-b*平面上分别测得16名色觉正常的观察者在不同颜色区域的辨色阈值, 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,等明度a*-b*平面非视觉均匀, 人眼对一、二象限的色宽容度普遍高于三、四象限的色宽容度, 对高彩度的橙色具有最高的宽容度, 对蓝色具有最低的宽容度, 所有的颜色在红-绿方向的视觉色差尺度均低于黄-蓝方向。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 study the human color vision characteristics, the just-noticeable color difference discrimination threshold experiment at the 17 basic CIE color centers with about 1000 pairs of samples was carried out by 16 observers with normal color vision on the CIE1976 a*-b* plane, by using reflective samples color stimuli based on the psychophysical method of constant stimuli. And the color discrimination thresholds were represented via chromaticity ellipses. The detailed processing and analysis of the experimental results indicate that the color discrimination characteristics of human eyes are different for individual color regions and directions in the a*-b* plane,and namely the CIE1976 a*-b* plane is visually non-uniform. The visual color tolerance in the third and fourth quadrants is smaller than the first and second quadrants, the biggest tolerance is in the region of high chroma orange, and the smallest is in blue.The visual color difference scale in the red-green direction is generally smaller than that in the yellow-blue one for the 17 CIE color centers. The experimental data provides references for the improvement of uniform color space and color-difference formula.