Frequency domain filter

Catalog

〇, The Fourier transform

One , low pass filter

1, Ideal low pass filter （ILPF）

2, Butterworth filter

3, Gauss filter

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〇, The Fourier transform

https://blog.csdn.net/nameofcsdn/article/details/118400482

Using two-dimensional Fourier transform and inverse transform , Frequency domain filter can be realized .

One , low pass filter

Low pass filter is used to filter high frequency information , Remove some edge information and noise .

There are three kinds of common ： Ideal low pass filter （ It's sharp ）、 Butterworth filter 、 Gauss filter （ It's smooth ）.

1, Ideal low pass filter （ILPF）

 

2, Butterworth filter

3, Gauss filter