OpenCV2.4 例程三 (求外包圆和外包矩形)

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以下程序来自OpenCV例程：

#include "stdafx.h"#include "opencv2/highgui/highgui.hpp"#include "opencv2/imgproc/imgproc.hpp"#include <iostream>using namespace cv;using namespace std;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)cvWaitKey();if( key == 27 || key == 'q' || key == 'Q' ) // 'ESC'break;}return 0;}

结果图：