（23）霍夫圆

知识点看这个博客：

https://blog.csdn.net/qq_41167777/article/details/84940109

===========================

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

Mat src, dst, gray_src;
const char* input_win = "input";
const char* out_put = "hough-line-detection";

int main(int agrc, char** agrv) {

    src = imread("C:\Users\32829\Desktop\aa.jpg");
    if (!src.data) {
        printf("no load..
");
        return -1;
    }
    namedWindow(input_win, CV_WINDOW_AUTOSIZE);
    namedWindow(out_put, CV_WINDOW_AUTOSIZE);
    imshow(input_win, src);

    Mat moutput;
    medianBlur(src, moutput, 3);
    cvtColor(moutput, moutput, CV_BGR2GRAY);

    //霍夫圆检测
    vector<Vec3f> pcircles;
    HoughCircles(moutput, pcircles, CV_HOUGH_GRADIENT, 1, 10, 100, 30, 5, 100);
    src.copyTo(dst);
    for (size_t i = 0; i < pcircles.size(); i++) {
        Vec3f cc = pcircles[i];
        circle(dst, Point(cc[0], cc[1]), cc[2], Scalar(0, 255, 255), 2, LINE_AA);
        circle(dst, Point(cc[0], cc[1]), 2, Scalar(98, 23, 255), 2, LINE_AA);
    }
    imshow(out_put, dst);
    waitKey(0);
    return 0;
}

=================================