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並前往https://www.bogotobogo.com/python/OpenCV_Python/python_opencv3_Signal_Processing_with_NumPy_Fourier_Transform_FFT_DFT_2.php

Signal Processing with NumPy II - Image Fourier Transform

fftshift(). Once we found the frequency transform, we can find the magnitude spectrum: magnitude_spectrum = 20*np.log(np.abs(fshift))

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