c++ - 在opencv中按下按键时显示

Question

有一个程序可以从摄像头获取实时信息:我想在按下键盘上的某个键时执行一些操作而不打扰正在进行的过程。我试过了

if(waitKey(30) == '27')
  cout << "ESC pressed";

但是这个不行。

Answer 1

Documentation:
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.

据我从您的问题中了解到，您似乎没有任何事件窗口。如果是这种情况，首先在 imshow 函数的帮助下显示图像，然后等待按下任意键。