#include "opencv2/highgui/highgui.hpp" #include "opencv2/imgproc/imgproc.hpp" #include <iostream> using namespace cv; using namespace std; static void help() { cout << "This program demonstrates finding the minimum enclosing box or circle of a set\n" "of points using functions: minAreaRect() minEnclosingCircle().\n" "Random points are generated and then enclosed.\n" "Call:\n" "./minarea\n" "Using OpenCV version %s\n" << CV_VERSION << "\n" << endl; } int main( int /*argc*/, char** /*argv*/ ) { help(); Mat img(500, 500, CV_8UC3); RNG& rng = theRNG(); for(;;) { int i, count = rng.uniform(1, 101); vector<Point> points; for( i = 0; i < count; i++ ) { Point pt; pt.x = rng.uniform(img.cols/4, img.cols*3/4); pt.y = rng.uniform(img.rows/4, img.rows*3/4); points.push_back(pt); } RotatedRect box = minAreaRect(Mat(points)); Point2f center, vtx[4]; float radius = 0; minEnclosingCircle(Mat(points), center, radius); box.points(vtx); img = Scalar::all(0); for( i = 0; i < count; i++ ) circle( img, points[i], 3, Scalar(0, 0, 255), CV_FILLED, CV_AA ); for( i = 0; i < 4; i++ ) line(img, vtx[i], vtx[(i+1)%4], Scalar(0, 255, 0), 1, CV_AA); circle(img, center, cvRound(radius), Scalar(0, 255, 255), 1, CV_AA); imshow( "rect & circle", img ); char key = (char)waitKey(); if( key == 27 || key == 'q' || key == 'Q' ) // 'ESC' break; } return 0; }