Mac-pycharm安装cv2
1.左上角preferences...
2.如图所示点击鼠标所在位置的加号
3.搜索框输入opencv，然后选择opencv-python，之后点击左下角Install Package
搜索框输入numpy，选择numpy，然后左下角安
4.输入简单的demo，运行（下面给出代码）
import numpy as np
import cv2
path = 'picture/dragon.jpeg'
new_path = 'picture/dragon_grey.jpeg'
img = cv2.imread(path, 0)
cv2.imshow(path, img)
k = cv2.waitKey(0)
if k == 27:# wait for ESC key to exit
cv2.destroyAllWindows()
elif k == ord('s'): # wait for 's' key to save and exit
cv2.imwrite(new_path, img)
cv2.destroyAllWindows()