opencv3 采集摄像头的画面canny化，或者读取视频

#include<opencv2/opencv.hpp>
#include<opencv2\opencv.hpp>
using namespace cv;

void main()
{
	VideoCapture capture(0);//("C:\\Users\\Administrator\\Desktop\\工作\\testv\\carchase.mpg");
	Mat edges;
	while(1)
	{
		Mat frame;
		capture>>frame;
		cvtColor(frame,edges,CV_BGR2GRAY);
		blur(edges,edges,Size(7,7));
		Canny(edges,edges,0,30,3);
		imshow("被canny后的视频",edges);
		waitKey(25);	 
	}
}