Filter High Pass Using Fourier Transform
5 views (last 30 days)
Show older comments
Hi, I tried fourier’s transform with a few high pass filters, but the code I made was not showing the process. So, someone could help me check the code.
FFT_ihpf=getimage(handles.axes5);
[M, N]= size(FFT_ihpf);
ft_ihpf=fft2(double(FFT_ihpf));
ihpf=fftshift(ft_ihpf);
figure(1);
imshow(abs(ft_ihpf),[]);
figure(2);
imshow(abs(ihpf),[]);
ihpf_logshift=log(1+abs(ihpf));
% axes (handles.axes10);
figure(3); imshow(abs(ihpf_logshift),[]);
n=2;
D0=20;
% D0= str2double(get(handles.edit5, 'String'));
% D0 =D0/100;
% % u=0:(M-1);
% % v=0:(N-1);
% % idX = find (u > M/2);
% % u(idX) = u(idX) - M;
% % idY = find (v > N/2);
% % v(idY) = v(idY) - N;
u = M/2;
v = N/2;
for i=1:M;
for j=1:N;
[V, U] = meshgrid(v, u);
D = sqrt((i-u).^2+(v-j).^2);
% H = double(D > D0);%IHPF
H = 1./(1 + (D0./D).^(2*n)); %BHPF
% H = 1-exp(-(D)^2/(2*(D0^2)));%GHPF
end
end
filter_G = H .* ihpf_logshift;
% axes(handles.axes11)
figure(4);
imshow(abs(filter_G),[]);
Out_ifft=ifftshift(filter_G);
% axes(handles.axes12)
figure(5);
imshow(abs(Out_ifft),[]);
ori= ifft2(Out_ifft);
figure(6);
imshow(log(abs(ori)));
but the result of IFFT2 showing no image and only black figure. please help me.
0 Comments
Answers (0)
See Also
Categories
Find more on Image Processing and Computer Vision in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!