Python - Remuestreo de imágenes-Aliasing

import cv2

import numpy as np

import matplotlib.pyplot as plt

import skimage

from skimage.transform import rescale

img = cv2.imread('madera2.jpg')

A = img[::2,::2] #aplico 3 veces la eliminación de filas y columnas pares.

B = A[::2,::2]

C = B[::2,::2]

plt.title("imread")

plt.imshow(C[...,::-1])

D = rescale(img,0.5,multichannel=True)

E = rescale(D,0.5,multichannel=True)

F = rescale(E,0.5,multichannel=True)

plt.title("rescale")

plt.imshow(F[...,::-1])