在emgucv 3.1中绘制等高线

using Emgu.CV;
using Emgu.CV.CvEnum;
using Emgu.CV.Structure;
using System;
using System.Drawing;

class Program
{
    static void Main(string[] args)
    {
        // 创建一个新的Emgu.CV.Image对象
        Image<Gray, byte> image = new Image<Gray, byte>(500, 500);

        // 绘制一些图形到图像中
        image.Draw(new CircleF(new PointF(250, 250), 100), new Gray(255), 1);
        image.Draw(new CircleF(new PointF(250, 250), 50), new Gray(255), 1);
        image.Draw(new CircleF(new PointF(250, 250), 25), new Gray(255), 1);

        // 将图像转换为灰度图像
        Image<Gray, byte> grayImage = image.Convert<Gray, byte>();

        // 对灰度图像进行边缘检测
        Image<Gray, byte> edges = grayImage.Canny(100, 200);

        // 对边缘图像进行等高线检测
        VectorOfVectorOfPoint contours = new VectorOfVectorOfPoint();
        CvInvoke.FindContours(edges, contours, null, RetrType.List, ChainApproxMethod.ChainApproxSimple);

        // 绘制等高线
        Image<Bgr, byte> result = new Image<Bgr, byte>(500, 500);
        CvInvoke.DrawContours(result, contours, -1, new MCvScalar(0, 0, 255), 2);

        // 显示结果图像
        CvInvoke.Imshow("Result", result);
        CvInvoke.WaitKey(0);
    }
}