python pyautogui录屏

while True:
    im2=pyautogui.screenshot("im2.png",region=(869,762,500,500))#region可调参，屏幕定位
    im2.save("im2.png")
    im3=cv2.imread("im2.png")
    cv2.imshow("im2.png",im3)
    cv2.waitKey(1)
cv2.destroyWindow("im2.png")