Python OpenCV显示图像并保存图像

源码如下：

import numpy as npimport cv2img = cv2.imread('lena.jpg',0)cv2.imshow('image',img)k = cv2.waitKey(0)if k == 27:    cv2.destroyAllWindows()elif k == ord('s'):    cv2.imwrite('lena.png',img)    cv2.destroyAllWindows()