Boynton R M, Nagy A L, Eskew R T
Department of Psychology, University of California, San Diego, La Jolla 92093.
Perception. 1986;15(6):755-63. doi: 10.1068/p150755.
Discrimination steps were measured for three subjects, along oblique axes passing through nine points in a 25 td constant-luminance chromaticity plane. When plotted in a normalized cone-excitation chromaticity diagram, the best-fitting discrimination ellipses for a given subject have approximately the same shape and orientation regardless of the reference chromaticity. Their orientation is consistent with the hypothesis that excitation of B-cones affects the red-green opponent balance, otherwise determined by R- and G-cone excitations, in a manner independent of initial cone-excitation levels. The CIELAB formula predicts an orientation for normalized ellipses in agreement with the data, but it also predicts systematic changes in the ratio of minor to major axes which are not observed experimentally.
针对三名受试者，沿着穿过25 td恒定亮度色度平面中九个点的斜轴测量辨别步骤。当绘制在归一化的锥体激发色度图中时，对于给定受试者，最佳拟合辨别椭圆无论参考色度如何，都具有大致相同的形状和方向。它们的方向与以下假设一致：B锥体的激发以独立于初始锥体激发水平的方式影响红-绿对立平衡，否则由R锥体和G锥体的激发决定。CIELAB公式预测的归一化椭圆方向与数据一致，但它还预测了长轴与短轴比率的系统性变化，而这在实验中并未观察到。
