包围轮廓的矩形边界 opencv

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

using namespace std;
using namespace cv;

int main()
{
    Mat image(600, 600, CV_8UC3);  //创建一个600*600 8位无符号字符型的3通道图像
    RNG& rng = theRNG();     ////用其引用来接收theRNG函数返回的随机数生成器

    while (1)
    {   
        char key; // 键值
        int count = rng.uniform(3,103);//随机生成点的数量3-103
        vector<Point>points;  //二维点集存在这个向量里面

        for (int i = 0; i < count; i++)   //点的坐标
        {
            Point point;
            point.x = rng.uniform(image.cols / 4, image.cols * 3 / 4);
            point.y = rng.uniform(image.rows / 4, image.cols * 3 / 4);
            points.push_back(point);  //生成的点放进points这个向量里面
        }
        //寻找最小面积的包围矩形
        RotatedRect box = minAreaRect(Mat(points));
        Point2f vertex[4];
        box.points(vertex);

        image = Scalar::all(0);//初始化图像为全黑色
        //随机化点的颜色 并画出
        for (int i = 0; i < count; i++)
        {
            circle(image, points[i], 3, Scalar(rng.uniform(0, 255), rng.uniform(0, 255), rng.uniform(0, 255)), FILLED, LINE_AA);
        }
        for (int i = 0; i < 4; i++)
        {
            line(image, vertex[i],vertex[(i+1)%4], Scalar(255, 255, 255), 2, LINE_AA);
        }
        //显示效果图
        imshow("矩形包围示例", image);
        //按下ESC退出程序
        key = (char)waitKey();
        if (key == 27)
            break;
    }

    return 0;
}