本文共 1249 字，大约阅读时间需要 4 分钟。

• 例子：摄像头实时检测圆形物体的中心（用的霍夫圆变换）

#include 
   
      using namespace std;using namespace cv;int main(){   	//【1】从摄像头读入视频	VideoCapture capture(1);	//=============存取视频=====================	//int w = capture.get(CV_CAP_PROP_FRAME_WIDTH);	//int h = capture.get(CV_CAP_PROP_FRAME_HEIGHT);	//int count = capture.get(CV_CAP_PROP_FRAME_COUNT);	//int fps = capture.get(CV_CAP_PROP_FPS);		//VideoWriter wri;	//wri.open("1.avi", CV_FOURCC('D', 'I', 'V', 'X'), fps, Size(w, h));	//=============================================	//【2】循环显示每一帧	while (1)	{   		Mat frame;  //定义一个Mat变量，用于存储每一帧的图像		Mat midImage, dstImage;//临时变量和目标图的定义		capture >> frame;  //读取当前帧		cvtColor(frame, midImage, COLOR_BGR2GRAY);		GaussianBlur(midImage, midImage, Size(9, 9), 2, 2);		//【4】进行霍夫圆变换		vector
    
      circles;		HoughCircles(midImage, circles, HOUGH_GRADIENT, 1.5, 10, 200, 100, 0, 0);		for (size_t i = 0; i < circles.size(); i++)		{   			//参数定义			Point center(cvRound(circles[i][0]), cvRound(circles[i][1]));			int radius = cvRound(circles[i][2]);			//绘制圆心			circle(frame, center, 3, Scalar(0, 255, 0), -1, 8, 0);			//绘制圆轮廓			circle(frame, center, radius, Scalar(155, 50, 255), 3, 8, 0);			//wri << frame;//保存视屏		}		imshow("读取视频", frame);  //显示当前帧		waitKey(10);  //延时30ms	}	return 0;}
    
   

转载地址：http://dfunz.baihongyu.com/