Singer B, D'Zmura M
Department of Cognitive Sciences, University of California, Irvine 92717.
J Opt Soc Am A Opt Image Sci Vis. 1995 Apr;12(4):667-85. doi: 10.1364/josaa.12.000667.
We report the results of psychophysical experiments on color contrast induction. In earlier work [Vision Res. 34, 3111 (1994)], we showed that modulating the spatial contrast of an annulus in time induces an apparent modulation of the contrast of a central disk, at isoluminance. Here we vary the chromatic properties of disk and annulus systematically in a study of the interactions among the luminance and the color-opponent channels. Results show that induced contrast depends linearly on both disk and annulus contrast, at low and moderate contrast levels. This dependence leads us to propose a bilinear model for color contrast gain control. The model predicts the magnitude and the chromatic properties of induced contrast. In agreement with experimental results, the model displays chromatic selectivity in contrast gain control and a negligible effect of contrast modulation at isoluminance on the appearance of achromatic contrast. We show that the bilinear model for chromatic selectivity may be realized as a feed-forward multiplicative gain control. Data collected at high contrast levels are fit by embellishing the model with saturating nonlinearities in the contrast gain control of each color channel.
我们报告了关于颜色对比诱导的心理物理学实验结果。在早期的工作中[《视觉研究》34, 3111 (1994)]，我们表明，在等亮度条件下，随时间调制环形区域的空间对比度会诱导中心圆盘对比度的明显调制。在此，我们在一项关于亮度和颜色对立通道之间相互作用的研究中，系统地改变圆盘和环形区域的色度特性。结果表明，在低对比度和中等对比度水平下，诱导对比度线性地依赖于圆盘和环形区域的对比度。这种依赖性促使我们提出一个用于颜色对比增益控制的双线性模型。该模型预测了诱导对比度的大小和色度特性。与实验结果一致地，该模型在对比增益控制中显示出色度选择性，并且在等亮度条件下对比度调制对消色差对比度外观的影响可忽略不计。我们表明，用于色度选择性的双线性模型可以实现为前馈乘法增益控制。通过在每个颜色通道的对比增益控制中用饱和非线性来完善模型，拟合了在高对比度水平下收集的数据。
