本文介紹了OpenCV 的 cvWaitKey() 函數有什么作用?的處理方法，對大家解決問題具有一定的參考價值，需要的朋友們下面隨著小編來一起學習吧！
問題描述
cvWaitKey() 執行過程中會發生什么?有哪些典型的用例?我在 OpenCV 參考中看到了它，但文檔并不清楚其確切用途.
What happens during the execution of cvWaitKey()? What are some typical use cases? I saw it in OpenCV reference but the documentation isn't clear on its exact purpose.
推薦答案
cvWaitKey(x)/cv::waitKey(x) 做了兩件事:
- 它等待 x 毫秒以等待 OpenCV 窗口(即從
cv::imshow()創建)上的按鍵.請注意，它不會在 stdin 上偵聽控制臺輸入.如果在此期間按下某個鍵，則返回該鍵的 ASCII 代碼.否則，它返回-1.(如果 x 為零，它會無限期地等待按鍵.) - 它處理任何窗口事件，例如使用
cv::namedWindow()創建窗口，或使用cv::imshow()顯示圖像.
- It waits for x milliseconds for a key press on a OpenCV window (i.e. created from
cv::imshow()). Note that it does not listen on stdin for console input. If a key was pressed during that time, it returns the key's ASCII code. Otherwise, it returns-1. (If x is zero, it waits indefinitely for the key press.) - It handles any windowing events, such as creating windows with
cv::namedWindow(), or showing images withcv::imshow().
opencv 新手的一個常見錯誤是通過視頻幀循環調用 cv::imshow()，而不用 cv::waitKey(30) 跟蹤每次繪制代碼>.在這種情況下，屏幕上不會顯示任何內容，因為 highgui 從來沒有時間處理來自 cv::imshow() 的繪制請求.
A common mistake for opencv newcomers is to call cv::imshow() in a loop through video frames, without following up each draw with cv::waitKey(30). In this case, nothing appears on screen, because highgui is never given time to process the draw requests from cv::imshow().
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