cvBoundingRect

 1 #include<iostream>  
 2 #include<vector>  
 3 #include<opencv2/opencv.hpp>  
 4 
 5 using namespace cv;  
 6 using namespace std;  
 7 
 8 int main()  
 9 {  
10     Mat srcImage(Size(600, 600), CV_8UC3, Scalar(0));  
11 
12     RNG &rng = theRNG();  
13 
14     char key;  
15     while (1)  
16     {  
17         //随机生成一些点  
18         //首先就是随机生成点的总数量  
19         int g_nPointCount = rng.uniform(3, 30);  
20         //接下来就是随机生成一些点的坐标  
21         vector<Point> points;  
22         for (int i = 0; i < g_nPointCount; i++)  
23         {  
24             Point midPoint;  
25 
26             midPoint.x = rng.uniform(srcImage.cols / 4, srcImage.cols * 3 / 4);  
27             midPoint.y = rng.uniform(srcImage.rows / 4, srcImage.rows * 3 / 4);  
28 
29             points.push_back(midPoint);  
30         }  
31 
32         //显示刚刚随机生成的那些点  
33         for (int i = 0; i < g_nPointCount; i++)  
34         {  
35             circle(srcImage, points[i], 0, Scalar(rng.uniform(0, 255), rng.uniform(0, 255), rng.uniform(0, 255)), 3);  
36         }  
37 
38         //在生成的那些随机点中寻找最小包围矩形  
39         //rect变量中得到了矩形  
40         Rect rect = boundingRect(points);  
41 
42         //根据得到的矩形  绘制矩形  
43         rectangle(srcImage, rect, Scalar(rng.uniform(0, 255), rng.uniform(0, 255), rng.uniform(0, 255)), 3);  
44 
45         imshow("【绘制结束后的图像】", srcImage);  
46 
47         key = waitKey();  
48         if (key == 27)  
49             break;  
50         else  
51             srcImage = Scalar::all(0);  
52     }