message: doc(tutorial_py_fourier_transform): Correct errors in tutorial for integer division and filter symmetry
diff: @@ -79,11 +79,11 @@ using **np.ifft2()** function. The result, again, will be a complex number. You
  absolute value.
  @code{.py}
  rows, cols = img.shape
  -crow,ccol = rows/2 , cols/2
  -fshift[crow-30:crow+30, ccol-30:ccol+30] = 0
  +crow,ccol = rows//2 , cols//2
  +fshift[crow-30:crow+31, ccol-30:ccol+31] = 0
  f_ishift = np.fft.ifftshift(fshift)
  img_back = np.fft.ifft2(f_ishift)
  -img_back = np.abs(img_back)
  +img_back = np.real(img_back)
  plt.subplot(131),plt.imshow(img, cmap = 'gray')
  plt.title('Input Image'), plt.xticks([]), plt.yticks([])
  