text: #encoding:utf-8
  import cv2  
  import numpy as np  
  import matplotlib.pyplot as plt
   
  #读取图片
  img = cv2.imread('lena-hd.png')
  test = img
  
  #方法一：Numpy加法运算
  result1 = img + test
  
  #方法二：OpenCV加法运算
  result2 = cv2.add(img, test)
  
  #显示图像
  cv2.imshow("original", img)
  cv2.imshow("result1", result1)
  cv2.imshow("result2", result2)
  
  #等待显示
  cv2.waitKey(0)
  cv2.destroyAllWindows()
  