Bandreject filtering on an image

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ram on 12 Mar 2014
Commented: Saumya Verma on 15 Apr 2019
How do i create a bandreject filter which i want to apply on an image ??
I want to create a bandrejectFilter of radius 10 and want to apply on an image
I know the code that i have written is wrong.Can somebody please help me with it
% Use Bandreject filter
u0=256; % Cutoff frequency
if D(u,v)<266
else H(u,v)=0
if D(u,v)>266
else H(u,v)=0

Accepted Answer

Image Analyst
Image Analyst on 12 Mar 2014
I don't understand that at all. All you're doing it some kind of strange way of intensity thresholding. Do you want to threshold a range of intensities or do a spatial frequency filter?
If you want a band reject spatial frequency filter, what I would do is to take the FFT, then call fftshift, then multiply by a black ring to zero out the stuff in the designated frequency range, then unshift and inverse fft.
Saumya Verma
Saumya Verma on 15 Apr 2019
Please upload the final code

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