Plot the 2D FFT of an image

Question

I'm trying to plot the 2D FFT of an image:

from scipy import fftpack, ndimage
import matplotlib.pyplot as plt

image = ndimage.imread('image2.jpg', flatten=True)     # flatten=True gives a greyscale image
fft2 = fftpack.fft2(image)

plt.imshow(fft2)
plt.show()

But I get TypeError: Image data can not convert to float.

How to plot the 2D FFT of an image?

Answer 1

The result of any fft is generally composed of complex numbers. That is why you can't plot it this way. Depending on what you're looking for you can start with looking at the absolute value

plt.imshow(abs(fft2))