extract 64 lowest frequency components of fft

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How to extract 64 lowest frequency components using fourier transform of an image
fft2 or fftn which function to use, and how to get the 64 feature vector as fft2 and fftn returns a matrix ouput

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Sulaymon Eshkabilov
Sulaymon Eshkabilov 2021년 5월 24일
For image analysis, fft2 is to be used and that is quite straightforward.
Here is an additional help discussion on this:
Good luck.

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