APPLICATION OF FOURIER ANALYSIS TO VISIBILITY OF GRATINGS
APPLICATION OF FOURIER ANALYSIS TO VISIBILITY OF GRATINGS
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DOI：
10.1113/jphysiol.1968.sp008574
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发表时间：
1968-01-01
影响因子：
5.5
通讯作者：
ROBSON, JG
中科院分区：
文献类型：
--
作者：
CAMPBELL, FW;ROBSON, JG
各种光栅模式的对比度阈值测量在广泛的空间频率范围内。亮度分布为正弦波、正方形波、矩形波或锯齿波的光栅检测的对比度阈值可以用傅里叶理论简单地联系起来。在很宽的空间频率范围内，光栅的对比度阈值仅由其波形的基本傅立叶分量的振幅决定。复杂波形的光栅不能与正弦波光栅区分，直到它们的对比度提高到高谐波分量达到其独立阈值的水平。这些发现可以用神经系统中存在的线性操作独立机制来解释，这些机制对有限的空间频率范围有选择性地敏感。
The contrast thresholds of a variety of grating patterns were measured over a wide range of spatial frequencies. Contrast thresholds for the detection of gratings whose luminance profiles are sine, square, rectangular or saw-tooth waves can be simply related using Fourier theory. Over a wide range of spatial frequencies the contrast threshold of a grating is determined only by the amplitude of the fundamental Fourier component of its wave form. Gratings of complex wave form cannot be distinguished from sine-wave gratings until their contrast has been raised to a level at which the higher harmonic components reach their independent threshold. These findings can be explained by the existence within the nervous system of linearly operating independent mechanisms selectively sensitive to limited ranges of spatial frequencies.