How to convert spatial domain to frequency domain

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);

Answer 1

[Animesh]

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