1 #include "opencv2/imgproc/imgproc.hpp" 2 #include "opencv2/highgui/highgui.hpp" 3 #include <fstream> 4 #include <iostream> 5 6 using namespace cv; 7 using namespace std; 8 9 static void help() 10 { 11 cout << "\nThis sample program demonstrates the use of the convexHull() function\n" 12 << "Call:\n" 13 << "./convexhull\n" << endl; 14 } 15 16 int main( int /*argc*/, char** /*argv*/ ) 17 { 18 Mat img(500, 500, CV_8UC3); 19 RNG& rng = theRNG(); 20 21 help(); 22 23 for(;;) 24 { 25 char key; 26 int i, count = (unsigned)rng%100 + 1; 27 28 vector<Point> points; 29 30 for( i = 0; i < count; i++ ) 31 { 32 Point pt; 33 pt.x = rng.uniform(img.cols/4, img.cols*3/4); 34 pt.y = rng.uniform(img.rows/4, img.rows*3/4); 35 36 points.push_back(pt); 37 } 38 39 vector<int> hull; 40 convexHull(Mat(points), hull, true); 41 42 img = Scalar::all(0); 43 for( i = 0; i < count; i++ ) 44 circle(img, points[i], 3, Scalar(0, 0, 255), FILLED, LINE_AA); 45 46 int hullcount = (int)hull.size(); 47 Point pt0 = points[hull[hullcount-1]]; 48 49 for( i = 0; i < hullcount; i++ ) 50 { 51 Point pt = points[hull[i]]; 52 line(img, pt0, pt, Scalar(0, 255, 0), 1,LINE_AA); 53 pt0 = pt; 54 } 55 56 imshow("hull", img); 57 58 key = (char)waitKey(); 59 if( key == 27 || key == 'q' || key == 'Q' ) // 'ESC' 60 break; 61 } 62 63 return 0; 64 } 65
