源码如下:
import numpy as np
import cv2
img = 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()
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