cv2.waitKey(x)解析

1.函数说明

def waitKey(delay=None): # real signature unknown; restored from __doc__"""waitKey([, delay]) -> retval. @brief Waits for a pressed key.. . The function waitKey waits for a key event infinitely (when \f$\texttt{delay}\leq 0\f$ ) or for delay. milliseconds, when it is positive. 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. It returns the code of the pressed key or -1 if no key was. pressed before the specified time had elapsed.. . @note. . This function is the only method in HighGUI that can fetch and handle events, so it needs to be. called periodically for normal event processing unless HighGUI is used within an environment that. takes care of event processing.. . @note. . The function only works if there is at least one HighGUI window created and the window is active.. If there are several HighGUI windows, any of them can be active.. . @param delay Delay in milliseconds. 0 is the special value that means "forever"."""pass

2.解释

函数waitKey无限地等待一个按键产生的事件即者当它为正数时，等待延迟时间单位为毫秒。由于操作系统在切换线程之间的时间最短，该函数将不会等待确切的延迟ms，它将等待至少延迟ms，这取决于当时在您的计算机上运行的其他内容。它返回按下的键的代码，如果在指定的时间之前没有按下键，则返回-1。
简而言之如果有正数x输入则 等待x ms，如果在此期间有按键按下，则立即结束并返回按下按键的ASCII码，否则返回-1
如果x=0，那么无限等待下去，直到有按键按下

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