Noorlander C, Heuts M J, Koenderink J J
J Opt Soc Am. 1981 Apr;71(4):453-9. doi: 10.1364/josa.71.000453.
Contrast-detection thresholds for various combinations of chromaticity and luminance differences were obtained for spatiotemporal square-wave modulation of a yellow field. The results are expressed in terms of excitation of the Vos-Walraven R,G primaries. For every spatiotemporal frequency the thresholds can be approximated by an ellipse in the red-green plane. Large variations were found in the orientation, magnitude, and eccentricity of the discrimination ellipses. It seems that a simple threshold function appears to be sufficient to describe the experimental data. Although the eye does not perceive hue contrast for high spatial frequencies, its sensitivity is not governed mainly by summation of the red and green channels.
通过对黄色场进行时空方波调制，获得了色度和亮度差异的各种组合的对比度检测阈值。结果以Vos-Walraven R、G原色的激发来表示。对于每个时空频率，阈值可以由红-绿平面中的椭圆近似。在辨别椭圆的方向、大小和偏心率方面发现了很大的变化。似乎一个简单的阈值函数就足以描述实验数据。尽管眼睛在高空间频率下无法感知色调对比度，但其灵敏度并非主要由红色和绿色通道的总和决定。
