OpenCV官方文档学习记录（18）

 1 #include <opencv2\opencv.hpp>
 2 #include <iostream>
 3 #include <string>
 4 #include <vector>
 5 
 6 #pragma comment( linker, "/subsystem:\"windows\" /entry:\"mainCRTStartup\"" )
 7 
 8 using namespace std;
 9 using namespace cv;
10 
11 void showImg(const string &win_name, const Mat &img)
12 {
13     namedWindow(win_name, CV_WINDOW_AUTOSIZE);
14     imshow(win_name, img);
15 }
16 
17 int main(void)
18 {
19     Mat src = imread("panzi.jpg");
20     if (src.empty())
21         return -1;
22     Mat dst;
23     cvtColor(src, dst, CV_BGR2GRAY);
24     showImg("dst", dst);
25     GaussianBlur(dst, dst, Size(9, 9), 2, 2);
26     vector<Vec3f> circles;
27     HoughCircles(dst, circles, CV_HOUGH_GRADIENT, 1, dst.rows / 8, 200, 100, 0, 0);
28     for (size_t i = 0; i < circles.size(); ++i)
29     {
30         Point center(cvRound(circles[i][0]), cvRound(circles[i][1]));
31         int radius = cvRound(circles[i][2]);
32         circle(src, center, 3, Scalar(0, 255, 0), -1, 8, 0);//绘制圆心
33         circle(src, center, radius, Scalar(0, 0, 255), 3, 8, 0);//绘制圆
34     }
35     showImg("after ciecle decete", src);
36     waitKey();
37     return 0;
38 }