frequency spectrum　fft2

2020 8 4
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About frequency analysis of luminance image (csv). I am dealing with images (luminance image 3840 x 3841) and I want to analyze the frequency (cycle/degree). What you want to know is how many frequencies are included (in frequency spectrum etc.). I don't understand the procedure after doing the two-dimensional Fourier transform (fft2). The sampling frequency is 128.2 cycle/degree. Please tell me the commands to display the spectrum.

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