how to fix broad band in fft?
2 visualizaciones (últimos 30 días)
Mostrar comentarios más antiguos
Hy guys.
I'm trying to obtain the fft of a array. however the result are coming out to be braod band, i expected to get bands with a width of 1 pixel.
any suggestion for this problem.
Thanks and Regards
code:
clear all
clc
z=50;
a=ones(z,z);
for i=1:z
for j=2:z
a(i,j)=a(i,j-1)+1;
end
end
a = a.'*a;
subplot(121)
img(abs(a))
subplot(122)
img(abs(log(fftshift(fft2(a)))))
% this is a small example what is happening in my results
4 comentarios
Catalytic
el 9 de Feb. de 2022
Editada: Catalytic
el 9 de Feb. de 2022
"i expected that's the band will not be broad , only 1 pixel as width , because the analytique equation should fit my band at 100% to extract to amplitude and the phase"
I don't really understand that part. The fft2 and ifft2 form an invertible 1-1 pair. Because a=ones(50) produces a 1-pixel wide spectrum, no other a can do so. Otherwise fft2 would not be invertible.
Respuestas (0)
Ver también
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!