opencv C++ 求连通域直径的代码

以下是求连通域直径的代码：

#include <opencv2/opencv.hpp>
#include <iostream>

using namespace cv;
using namespace std;

int main()
{
    Mat src = imread("test.jpg", IMREAD_GRAYSCALE);
    if (src.empty())
    {
        cout << "Could not open or find the image!\n";
        return -1;
    }

    // 二值化
    Mat binary;
    threshold(src, binary, , 255, THRESH_BINARY | THRESH_OTSU);

    // 连通域分析
    Mat labels, stats, centroids;
    int num_labels = connectedComponentsWithStats(binary, labels, stats, centroids);

    // 找到最大连通域
    int max_label = 1, max_area = stats.at<int>(1, CC_STAT_AREA);
    for (int i = 2; i < num_labels; i++)
    {
        int area = stats.at<int>(i, CC_STAT_AREA);
        if (area > max_area)
        {
            max_label = i;
            max_area = area;
        }
    }

    // 找到最大连通域的最小外接圆
    Point2f center;
    float radius;
    minEnclosingCircle(Mat(labels == max_label), center, radius);

    // 输出直径
    cout << "直径：" << 2 * radius << endl;

    return ;
}

希望对你有帮助！