1 #include<opencv2/opencv.hpp>
2 #include<iostream>
3
4 using namespace std;
5 using namespace cv;
6
7 int main()
8 {
9 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
10 RNG& rng = theRNG(); ////用其引用来接收theRNG函数返回的随机数生成器
11
12 while (1)
13 {
14 char key; // 键值
15 int count = rng.uniform(3,103);//随机生成点的数量3-103
16 vector<Point>points; //二维点集存在这个向量里面
17
18 for (int i = 0; i < count; i++) //点的坐标
19 {
20 Point point;
21 point.x = rng.uniform(image.cols / 4, image.cols * 3 / 4);
22 point.y = rng.uniform(image.rows / 4, image.cols * 3 / 4);
23 points.push_back(point); //生成的点放进points这个向量里面
24 }
25 //寻找最小面积的包围矩形
26 RotatedRect box = minAreaRect(Mat(points));
27 Point2f vertex[4];
28 box.points(vertex);
29
30 image = Scalar::all(0);//初始化图像为全黑色
31 //随机化点的颜色 并画出
32 for (int i = 0; i < count; i++)
33 {
34 circle(image, points[i], 3, Scalar(rng.uniform(0, 255), rng.uniform(0, 255), rng.uniform(0, 255)), FILLED, LINE_AA);
35 }
36 for (int i = 0; i < 4; i++)
37 {
38 line(image, vertex[i],vertex[(i+1)%4], Scalar(255, 255, 255), 2, LINE_AA);
39 }
40 //显示效果图
41 imshow("矩形包围示例", image);
42 //按下ESC退出程序
43 key = (char)waitKey();
44 if (key == 27)
45 break;
46 }
47
48 return 0;
49 }
![](https://img2018.cnblogs.com/blog/1408690/201809/1408690-20180928191526975-1544664339.png)
![](https://img2018.cnblogs.com/blog/1408690/201809/1408690-20180928191531851-1448423233.png)
![](https://img2018.cnblogs.com/blog/1408690/201809/1408690-20180928191537827-1814405697.png)