用于等待按鈕。當用戶按下按鈕時，句子將被執(zhí)行并獲得返回值。

retval=cv2.waitKey([delay]) Retval：表示返回值； Delay：鍵觸發(fā)的時間，單位為ms。3、實例

import cv2lena=cv2.imread('D:pmjcvlena.bmp')cv2.namedWindow('lesson')cv2.imshow('lesson',lena)key=cv2.waitKey()

實例擴展:

# 需要導(dǎo)入模塊: import cv2 [as 別名]# 或者: from cv2 import waitKeyEx [as 別名]def on_process_messages(self, sleep_time=0):has_windows = Falsehas_capture_keys = Falseif len(self.named_windows) != 0: has_windows = Trueif len(self.capture_keys_windows) != 0: has_capture_keys = Trueif has_windows or has_capture_keys: wait_key_time = max(1, int(sleep_time*1000) ) ord_key = cv2.waitKeyEx(wait_key_time)shift_pressed = False if ord_key != -1:chr_key = chr(ord_key) if ord_key <= 255 else chr(0)if chr_key >= ’A’ and chr_key <= ’Z’: shift_pressed = True ord_key += 32elif chr_key == ’?’: shift_pressed = True ord_key = ord(’/’)elif chr_key == ’<’: shift_pressed = True ord_key = ord(’,’)elif chr_key == ’>’: shift_pressed = True ord_key = ord(’.’)else: if sleep_time != 0:time.sleep(sleep_time)if has_capture_keys and ord_key != -1: self.add_key_event ( self.focus_wnd_name, ord_key, False, False, shift_pressed)

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