Transform the high passed 2-D FFT phase to Log Polar space
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I want to transform the high passed 2-D FFT phase to Log Polar space, can anyone help me with the matlab code for this
FA = fftshift(fft2(I));
w=0.5; % frequency normalized
N=2; %filter order
b=butter(N,w,'high');
A=ftrans2(b);
IA=imresize(A,[512 512]);
highPass=IA.*abs(FA);% high passed shifted fft2 of image I
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Answers (1)
Walter Roberson
on 11 Feb 2012
Your filter creation is badly broken, so transforming it to Log Polar is not going to produce meaningful results.
For more on your filter creation, see your previous question, http://www.mathworks.com/matlabcentral/answers/28591-high-pass-filter
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