腐蚀

import cv2
import numpy as np
import matplotlib.pyplot as plt
img = cv2.imread('test9.jpg')
img = cv2.cvtColor(img,cv2.COLOR_BGR2RGB)
kernel = np.ones((3,3),np.uint8)
erosion = cv2.erode(img,kernel,iterations = 1)
plt.subplot(121),plt.imshow(img),plt.title('original')
plt.xticks([]),plt.yticks([])
plt.subplot(122),plt.imshow(erosion),plt.title('erosion')
plt.xticks([]),plt.yticks([])
plt.show()

测试时候用的test9.jpg

 test3.jpg如下：