绘制图像的2D FFT [英] Plot the 2D FFT of an image

问题描述

我正在尝试绘制图像的 2D FFT:

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()

但是我得到了 TypeError:图像数据无法转换为浮点数.

如何绘制图像的2D FFT?

推荐答案

任何 fft 的结果一般都是由复数组成.这就是为什么你不能以这种方式绘制它.根据您要查找的内容，您可以先查看绝对值

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))

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