傅里叶分析在光栅可见度中的应用。
Application of Fourier analysis to the visibility of gratings.
作者信息
Campbell F W, Robson J G
出版信息
J Physiol. 1968 Aug;197(3):551-66. doi: 10.1113/jphysiol.1968.sp008574.
Abstract
- The contrast thresholds of a variety of grating patterns have been measured over a wide range of spatial frequencies.2. 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.3. 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.4. 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.5. 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.
摘要
已在很宽的空间频率范围内测量了各种光栅图案的对比度阈值。
利用傅里叶理论可以简单地关联检测亮度分布为正弦波、方波、矩形波或锯齿波的光栅的对比度阈值。
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波傅里叶分量的幅度决定。
复杂波形的光栅在其对比度提高到较高谐波分量达到其独立阈值的水平之前，无法与正弦波光栅区分开来。
这些发现可以通过神经系统中存在对有限空间频率范围有选择性敏感的线性操作独立机制来解释。
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