import cv2
import numpy as np
# from matplotlib import pyplot as plt

img = cv2.imread('messi5.jpg',0)
f = np.fft.fft2(img)
fshift = np.fft.fftshift(f)
magnitude_spectrum = 20*np.log(np.abs(fshift))
print magnitude_spectrum
#cv2.imshow('input',f)
rows, cols = img.shape
crow,ccol = rows/2 , cols/2
fshift[crow-30:crow+30, ccol-30:ccol+30] = 0
f_ishift = np.fft.ifftshift(fshift)
img_back = np.fft.ifft2(f_ishift)
img_back = np.abs(img_back)

cv2.imshow('input',img)
cv2.imshow('transformada abs',img_back)
if cv2.waitKey(0) == 27:
    cv2.destroyAllWindows()