Defining a notch filter

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Ayesha ch
Ayesha ch 2017-5-26
编辑： Ayesha ch 2017-5-26
Hi, I'm new to Matlab. I'm trying to define a notch filter in matlab and implement it. The steps I've read for manually defining a notch filter so far are:
1- Taking the fft
2-Taking fftshift of the image
3- Defining the noise frequences in the fftshift image as notch centers
4-Implementing notch filter
I've done steps 1 and 2
I=imread('cameraman.tif');
F=fft2(I);
F = fftshift(F); % Center FFT
F = abs(F); % Get the magnitude
F = log(F+1); % Use log, for perceptual scaling, and +1 since log(0) is undefined
F = mat2gray(F); % Use mat2gray to scale the image between 0 and 1
imshow(F,[]);
Now I don't know how to get the frequencies to set as the notch centers. Kindly help!

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