Hetley Richard S, Stine Wm Wren
University of California, 3151 Social Science Plaza A, Irvine, CA 92697-5100, USA.
Seeing Perceiving. 2011;24(4):315-50. doi: 10.1163/187847511X584461.
While most of the work on stereopsis focuses on geometric disparities, humans also respond to intensity (contrast or luminance) disparities in the absence of geometric disparities. A rectangular-wave grating viewed with an intensity disparity engenders two perceptions: a perceived intensity, and a perceived rotation of the individual bars of the grating (the Venetian blind effect). Measuring perceived intensity and perceived rotation in gratings with intensity disparities, we found that the two degrees of freedom from the intensities presented to each eye are conserved in the form of two perceptions: perceived intensity is related to the sum of the grating intensities and perceived rotation is related to the difference. Perceived rotation as a function of intensity disparity was then modeled as a simple difference in the neural response of each eye. Perceived contrast and brightness as a function of intensity disparity were modeled using the two-stage gain-control model.
虽然大多数关于立体视觉的研究都集中在几何视差上，但在没有几何视差的情况下，人类也会对强度（对比度或亮度）视差做出反应。用强度视差观察矩形波光栅会产生两种感知：一种是感知到的强度，另一种是光栅各条带的感知旋转（百叶窗效应）。通过测量具有强度视差的光栅中的感知强度和感知旋转，我们发现呈现给每只眼睛的强度的两个自由度以两种感知的形式得以保留：感知强度与光栅强度之和相关，感知旋转与差值相关。然后将感知旋转作为强度视差的函数建模为每只眼睛神经反应的简单差异。使用两阶段增益控制模型对感知对比度和亮度作为强度视差的函数进行建模。
