7.opencv-python；cv2库；形态学；开运算、闭运算：图像膨胀与腐蚀交换顺序

import cv2 #opencv读取的格式是BGR
import numpy as np
import matplotlib.pyplot as plt#Matplotlib是RGB
%matplotlib inline 
 
# 读取
img=cv2.imread('lena.jpg')
img_gray = cv2.cvtColor(img,cv2.COLOR_BGR2GRAY)
 
# 图像二值化
ret, thresh1 = cv2.threshold(img_gray, 127, 255, cv2.THRESH_BINARY)

# 卷积核3x3，值置1
kernel = np.ones((3,3),np.uint8) 
# 先腐蚀后膨胀
opening = cv2.morphologyEx(thresh1, cv2.MORPH_OPEN, kernel)
# 先膨胀后腐蚀
closing = cv2.morphologyEx(thresh1, cv2.MORPH_CLOSE, kernel)
# 图像拼一块
res = np.hstack((opening,closing))

# 图像显示
cv2.imshow('res',res)
cv2.waitKey(0)
cv2.destroyAllWindows()

先腐蚀去毛刺。