How to convert spatial domain to frequency domain

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mohd akmal masud
mohd akmal masud 2024-11-24
回答： Animesh 2024-11-24
Dear all,
I have set daya (as attached), the was coding as below to view my spatial domain (image).
Anyone can help me how to convert it into frequency domain?
clc
clear all
close all
sz = [128 128 1];
fname = 'pointlmf.a00';
fid = fopen(fname);
data = fread(fid,'*float'); % assuming uint
fclose(fid);
% this is blindly devectorized
% may still be transposed, but i can't tell due to symmetry
% note that data is unit-scale single-precision float
data = reshape(data,sz);

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回答（1 个）

Animesh
Animesh 2024-11-24
Hey @mohd akmal masud
To convert your spatial domain data into the frequency domain using MATLAB, you can use the Fast Fourier Transform (FFT) with the "fft2" function.
Here is how you can do it:
frequencyDomainData = fft2(data);
% Shift the zero-frequency component to the center of the spectrum
frequencyDomainDataShifted = fftshift(frequencyDomainData);
You can refer the following MathWorks documentation for more information on "fft2" function:
https://www.mathworks.com/help/releases/R2023b/matlab/ref/fft2.html

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