Python - Filtro paso alto

import cv2

import numpy as np

from matplotlib import pyplot as plt

import skimage.transform as tf

import math

lenaToday = cv2.imread('LenaToday.png',0)

f= np.fft.fft2(lenaToday)

fshift = np.fft.fftshift (f)

print (fshift.shape, fshift.dtype)

Espectro = (np. log (np.abs(fshift)))

plt.title('Espectro')

plt.imshow(Espectro,cmap ='gray')

rows,cols =lenaToday.shape

crow,ccol = rows//2, cols//2

mask = np.ones((rows,cols),np.uint8)

mask[crow-30:crow+30, ccol-30:ccol+30]=0

print (fshift.shape)

fshift =fshift*mask

f_ishift = np.fft.ifftshift(fshift)

lenaToday_filtro = np.fft.ifft2(f_ishift)

lenaToday_filtro = np.abs(lenaToday_filtro)

plt.title('LenaToday HPF')

plt.imshow(lenaToday_filtro,cmap='gray')