OpenCV轮廓vectorvector

OpenCV轮廓vectorvector，vector，vector，vector

https://blog.csdn.net/Ahuuua/article/details/80593388

 

轮廓周围绘制矩形框

vector<vector<Point>>，vector<V e c 4 i>，vector<R e c t>，vector<R o t a t e d R e c t>

刚开始学OpenCV没多久遇到这些个东西不知道是什么，搞得很不舒服。

通过给轮廓绘制矩形框弄明白了这些东西。

vector<vector<Point>>：

vector容器里面放了一个vector容器，子容器里放点

vector<V e c 4 i>：放了4维int向量

vector<R e ct>： 像素width * height   from  位置(x*y)

vector<R o t a t e d R e c t>：如图三个成员

上述结果的代码如下：

1.  
   #include <opencv2/opencv.hpp>
2.  
   #include <iostream>
3.  
    
4.  
   using namespace cv;
5.  
   using namespace std;
6.  
    
7.  
   int main() {
8.  
   Mat src, gray_src, drawImg, bin_output;
9.  
    
10.  
    src = imread("F:/Temp_vs/pic/09.jpg");
11.  
    namedWindow("input", CV_WINDOW_AUTOSIZE);
12.  
    namedWindow("output", CV_WINDOW_AUTOSIZE);
13.  
    imshow("input", src);
14.  
     
15.  
    cvtColor(src, gray_src, CV_BGR2GRAY);
16.  
    blur(gray_src, gray_src, Size(10, 10), Point(-1, -1), BORDER_DEFAULT);
17.  
     
18.  
    //这些个类型
19.  
    vector<vector<Point>> contours;
20.  
    vector<Vec4i> hierarchy;
21.  
     
22.  
    threshold(gray_src, bin_output, 144, 255, 0); //二值化
23.  
    findContours(bin_output, contours, hierarchy, RETR_TREE, CHAIN_APPROX_SIMPLE, Point(0, 0)); //找轮廓
24.  
     
25.  
    //这些个类型
26.  
    vector<vector<Point>> contours_poly(contours.size());
27.  
    vector<Rect> poly_rects(contours.size());
28.  
    vector<RotatedRect> minRect(contours.size());
29.  
     
30.  
    //取点
31.  
    for (size_t i = 0; i < contours.size(); i++)
32.  
    {
33.  
    approxPolyDP(Mat(contours[i]), contours_poly[i], 3, true); //减少轮廓点数
34.  
     
35.  
    poly_rects[i]=boundingRect(contours_poly[i]);//获取绘制矩形数据
36.  
     
37.  
    if (contours_poly[i].size() > 5) {
38.  
    minRect[i] = minAreaRect(contours_poly[i]);//获取绘制旋转矩形数据
39.  
    }
40.  
    }
41.  
     
42.  
    //开始绘制
43.  
    src.copyTo(drawImg);
44.  
    Point2f pst[4];//储存单个旋转矩形的四个点
45.  
    cout << "----------Point2f pst[4]------------" << endl;
46.  
    for (size_t i = 0; i < contours.size(); i++)
47.  
    {
48.  
    rectangle(drawImg, poly_rects[i], Scalar(255, 0, 0), 2, 8);//绘制矩形框
49.  
     
50.  
    minRect[i].points(pst);//用线段画矩形，将RotatedRect类型转化为四个点
51.  
     
52.  
    for (size_t u = 0; u < 4; u++)
53.  
    {
54.  
    line(drawImg, pst[u], pst[(u + 1) % 4], Scalar(0, 255, 0), 2, 8);
55.  
    cout << pst[u]; //显示pst的数据
56.  
    }
57.  
    cout << endl;
58.  
    Rect brect = minRect[i].boundingRect(); //返回包含旋转矩形的最小矩形
59.  
    rectangle(drawImg, brect,Scalar(0, 0, 255));
60.  
    }
61.  
    cout << endl;
62.  
    imshow("output", drawImg);
63.  
     
64.  
    cout << "----------vector<vector<Point>> contours_poly------------" << endl;
65.  
    for (size_t i = 0; i < contours_poly.size(); i++)
66.  
    {
67.  
    cout << "第" << i << "行：";
68.  
    for (size_t j = 0; j < contours_poly[i].size(); j++)
69.  
    {
70.  
    cout<<contours_poly[i][j];
71.  
    }
72.  
    cout << endl;
73.  
    }
74.  
    cout << endl;
75.  
     
76.  
    cout << "----------vector<Vec4i> hierarchy------------" << endl;
77.  
    for (size_t i = 0; i < hierarchy.size(); i++)
78.  
    {
79.  
    cout << hierarchy[i] << endl;
80.  
    }
81.  
    cout << endl;
82.  
     
83.  
    cout << "----------vector<Rect> poly_rects------------" << endl;
84.  
    for (size_t i = 0; i < poly_rects.size(); i++)
85.  
    {
86.  
    cout << poly_rects[i]<<endl;
87.  
    }
88.  
    cout << endl;
89.  
     
90.  
    cout << "---------vector<RotatedRect> minRect------------" << endl;
91.  
    for (size_t i = 0; i <minRect.size(); i++) //显示一下点minRect
92.  
    {
93.  
    cout <<"angle:"<< minRect[i].angle<<" center:"<< minRect[i].center<<" size:"<< minRect[i].size<<endl;
94.  
    }
95.  
    cout << endl;
96.  
     
97.  
    waitKey(0);
98.  
    return 0;
99.  
    }