Watt R J, Morgan M J
Vision Res. 1983;23(12):1465-77. doi: 10.1016/0042-6989(83)90158-x.
Experiments are reported that measure the precision with which observers can (a) discern the degree of blur of an edge, (b) distinguish between two different types of blur, and relate the locations of two such edges by judging their (c) misalignment or (d) separation. Three blurring functions were used, and detailed examination of the retinal stimulus in each case leads to a simple hypothesis for the visual coding of edge blur. This is interpreted in terms of a general and primitive code for the transduction of local and widespread spatial luminance changes, in which stationary points in an approximation to the second derivative are detected and localized. The phenomena of illusory brightness changes in Mach bands and the Chevreul illusion find a ready explanation in this theory.
本文报道了一些实验，这些实验测量了观察者能够（a）辨别边缘模糊程度、（b）区分两种不同类型模糊以及通过判断两条此类边缘的（c）错位或（d）间距来关联它们位置的精度。使用了三种模糊函数，对每种情况下视网膜刺激的详细检查得出了一个关于边缘模糊视觉编码的简单假设。这可以根据一种用于转导局部和广泛空间亮度变化的通用且原始的编码来解释，其中检测并定位了近似二阶导数中的驻点。马赫带中的虚幻亮度变化现象和谢弗勒尔错觉在该理论中得到了现成的解释。
