Python实现位图分割的效果

import cv2
import numpy as np
import matplotlib.pyplot as plt
img = cv2.imread('Fig3.13.jpg', 0)
imgBS = np.zeros_like(img)
plt.figure("Image")
plt.subplot(2, 4, 1)
plt.imshow(img, cmap='gray')
plt.axis('off')
plt.title('original')
for n in range(1, 8):
 for x in range(img.shape[0]):
  for y in range(img.shape[1]):
gray = img[x, y] & pow(2, n-1)
if gray == pow(2, n-1):
 imgBS[x, y] = 255
else:
 imgBS[x, y] = 0
 plt.subplot(2, 4, n+1)
 plt.imshow(imgBS, cmap='gray')
 plt.axis('off')
 plt.title(str(n) + 'bit')
plt.show()