#include <opencv2/opencv.hpp>
#include <opencv2/highgui/highgui_c.h>
#include <iostream>

using namespace cv;
using namespace std;

int main()
{
    char c = 0;
    VideoCapture capture(0);//打开摄像头
    while(1)
    {
    Mat frame;
    capture >>frame;
    Mat midImage; 
    cvtColor(frame,midImage, CV_BGR2GRAY);//转化为灰度图
    GaussianBlur( midImage, midImage, Size(9, 9), 2, 2 );//进行霍夫圆变换
    vector<Vec3f> circles;
    HoughCircles( midImage, circles, CV_HOUGH_GRADIENT,1.5, 10, 200, 100, 0, 0 );//霍夫圆变换
    for( size_t i = 0; i < circles.size(); i++ )
    {
    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 );//打印圆心坐标
     circle( frame, center, radius, Scalar(255,50,255), 3, 8, 0 );//绘制圆轮廓
     printf("x = %d,y = %d\n",cvRound(circles[i][0]),cvRound(circles[i][1]));}
     namedWindow("检测结果");
     imshow("检测结果", frame);
     c = cvWaitKey(30);
     if (c == 27)
     {
     break;
     }
     }
     return 0;
     }

代码有缺陷，霍夫圆测量并不准确