def lp_surveillance():
folder_name = 'license plate - ' + du.current_time_str()
def detect_lp():
img_path = du.save_img(drone, folder_name)
plates = au.detect_plates(alpr, img_path)
if plates is not None:
au.print_plates(plates)
du.manual_control(drone, func=detect_lp)
def manual_flight():
du.manual_control(drone)
