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