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。

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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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