Symmetrical appearance of bright and dark Mach bands from an exponential illumination gradient.
Symmetrical appearance of bright and dark Mach bands from an exponential illumination gradient.
复制标题
指数照明梯度中亮和暗马赫带的对称外观。
DOI：
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发表时间：
1971
影响因子：
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通讯作者：
M. Davidson
中科院分区：
文献类型：
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作者：
J. Whiteside;M. Davidson
观察员观看了两个家庭的马赫带诱导刺激，其中梯度区域的亮度分布G在刺激之间变化。在一个家族中，函数G几乎是连续变化的，从凸的，通过线性和指数，到更明显的凹形式。指数分布被选为最对称的明亮和黑暗的马赫带的位置和外观。第二类是一系列幂函数，其中决定G的指数在1.47和12.50之间变化。相反，可能的期望的基础上史蒂文斯的幂律的亮度感知，这些刺激出现相当不对称的指数刺激。这些结果与人类视觉系统中侧抑制相互作用的线性阶段之前的对数变换的假设是一致的。
Observers viewed two families of Mach-band-inducing stimuli in which the luminance distribution G of the gradient region varied among stimuli. In one family, the function G was varied almost continuously from a convex, through a linear and an exponential, to an even more pronounced concave form. The exponential distribution was selected as appearing the most symmetrical in terms of the placement and appearance of the bright and dark Mach bands. The second family was a series of power functions in which the exponent that determines G varied between 1.47 and 12.50. Contrary to possible expectations based on Stevens’s power law for brightness perception, these stimuli appeared considerably less symmetric than the exponential stimulus. These results are consistent with the hypothesis of a logarithmic transformation prior to a linear stage of lateral inhibitory interaction in the human visual system.