OpenCV 调用摄像头

#include <opencv2/highgui/highgui.hpp>  
#include <opencv2/imgproc/imgproc.hpp>  
#include <opencv2/core/core.hpp>  

using namespace cv;  


int main()  
{  
	VideoCapture cap(0);  
	if(!cap.isOpened())  
	{  
		return -1;  
	}  
	Mat frame;  
	Mat edges;  

	bool stop = false;  
	while(!stop)  
	{  
		cap>>frame;  
		imshow("video",frame);  
		if(waitKey(30) >=0)  
			stop = true;  
	}  
	return 0;  
}