可能重复： OpenCV-cvWaitKey（）
我想过滤视频帧。
for(;;)
{
cap.read( frame);
medianBlur(frame,framedst,5);
imshow("frame",frame);
imshow("framedst",framedst);
if( waitKey (30) >= 0) break;
}
What does the waitKey(30) mean? Because if I comment out the line if( waitKey (30) >= 0) break;, the above code doesn't work!
最佳答案
The function waitKey() waits for a key event for a "delay" (here, 30 milliseconds). As explained in the OpenCV documentation, HighGui (imshow() is a function of HighGui) need a call of waitKey regularly, in order to process its event loop.
即，如果您不调用waitKey，HighGui将无法处理Windows事件，例如重绘，调整大小，输入事件等。因此，即使有1ms的延迟，也只需调用它即可：)
