shape) コンソールへの出力はこうなります。 (256, 256, 3)

cv2.waitKey(delay) decides for how long the image will be displayed.

cv::waitKeyについて.
But remember that this delay is a minimum amount of time it will wait, in reality the wait is much longer. cv2.waitKey接口 Python: cv2.waitKey([delay]) → retval Parameters: delay – Delay in milliseconds. Since the OS has a minimum time between switching threads, the function will not wait exactly delay ms, it will wait at least delay ms, depending on what else is running on your computer at that time. VideoCapture (camera_id) if not cap. waitKey (delay) & 0xFF == ord ('q'): break cv2… cv2.waitKey接口 Python: cv2.waitKey([delay]) → retval Parameters: delay – Delay in milliseconds. isOpened (): sys. さて、cv::waitKeyですが、引数delayを取るAPIです。 このAPIは、公式ドキュメントを見ると、delayが0より大きければdelay[ms]だけ待ち、それ以外(delayが0か負の数)の場合はキー入力があるまで待ちます。 1. waitKey()–是在一个给定的时间内(单位ms)等待用户按键触发; 如果用户没有按下键,则继续等待 (循环)

destroyAllWindows print (im.

import cv2 im = cv2. OpenCV中的一个函数函数原型为：C++: intwaitKey(int delay=0)Python: cv2.waitKey([delay])→retvalC: intcvWaitKey(int delay=0)Python: cv.WaitKey(delay=0)→int函数功能：cvWait_python waitkey imshow ('test', im) cv2. The function waitKey waits for a key event infinitely (when delay <= 0 ) or for delay milliseconds, when it is positive. imread ('original.png') cv2. cv2.destroyAllWindows() simply destroys all the windows we created. 0 is the special value that means “forever”. このコードでは、 if cv2.

waitKey(0)関数は、何も入力がない場合は-1を返します。イベントが発生するとすぐに、 ボタンが押されると、 32ビットの整数が返されます。 このシナリオの0xFFは、バイナリ11111111を8ビットバイナリで表しています。。これは、文字を表す … In an application I wrote (more complex than this though) using cv2.waitKey(1) after showing each frame, I get a 50% increase in fps by simply holding down a key on my keyboard. The function waitKey waits for a key event infinitely (when \(\texttt{delay}\leq 0\) ) or for delay milliseconds, when it is positive. Its argument delay is the time in milliseconds. waitKey cv2. waitKey (0) & 0xFF == ord ('q'): break. If the delay is <=0, the image will be shown forever otherwise destroyed after delay milliseconds. They are from open source Python projects. That's why you see these difference in behaviour. 0 is the special value that means “forever”. The function waitKey waits for a key event infinitely (when delay <= 0 ) or for delay milliseconds, when it is positive. The following are code examples for showing how to use cv2.waitKey(). You can vote up the examples you like or vote down the ones you don't like. read cv2. cv2.waitKey() 接口 : def waitKey(delay=None) 函数功能： waitKey() 函数的功能是不断刷新图像 , 频率时间为delay , 单位为ms 返回值为当前键盘按键值. imshow (window_name, frame) if cv2. import cv2 import sys camera_id = 0 delay = 1 window_name = 'frame' cap = cv2. 0 is the special value that means “forever”.

From the documentation you can see that cv2.waitKey(delay) waits for delay milliseconds if delay is positive but for ever (waits for a key event infinitely) if it's zero or negative. exit while True: ret, frame = cap.

The function waitKey waits for a key event infinitely (when delay <= 0 ) or for delay milliseconds, when it is positive. Hands-off FPS: 64.09 Key-repeat FPS: 90.99 cv2.waitKey接口 Python: cv2.waitKey([delay]) → retval Parameters: delay – Delay in milliseconds.