https://blog.csdn.net/myjiayan/article/details/72427995
convolution in frequency domain
convolution in spatial domain == multiplication in frequency domain.
FFT Fast Fourier Transform
smoothing and blur
low and high pass filter
properties of Fourier Transform
Fourier pair
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作者：matdodo
来源：CSDN
原文：https://blog.csdn.net/myjiayan/article/details/72427995
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