The results show that Fourier Series Smoothing method is not only an efficient method, but also is easy to estimate image quality using modulation transfer function.
试验结果表明：付立叶级数滤波法是一种行之有效的方法，并便利于用调制传递函数评价影象质量。
The OTF (Optical Transfer Function) of an optical system can be evaluated by the Fourier Transform of the first derivative of the optical image of an knife-edge (object).
对光学系统输出刀口像的一阶导数做傅里叶变换，可以得到该系统的光学传递函数（OTF）。
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