65 lines
1.4 KiB
C++
65 lines
1.4 KiB
C++
#include "opencv2/imgproc/imgproc.hpp"
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#include "opencv2/highgui/highgui.hpp"
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#include <fstream>
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#include <iostream>
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using namespace cv;
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using namespace std;
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static void help()
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{
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cout << "\nThis sample program demonstrates the use of the convexHull() function\n"
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<< "Call:\n"
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<< "./convexhull\n" << endl;
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}
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int main( int /*argc*/, char** /*argv*/ )
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{
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Mat img(500, 500, CV_8UC3);
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RNG& rng = theRNG();
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help();
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for(;;)
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{
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char key;
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int i, count = (unsigned)rng%100 + 1;
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vector<Point> points;
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for( i = 0; i < count; i++ )
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{
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Point pt;
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pt.x = rng.uniform(img.cols/4, img.cols*3/4);
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pt.y = rng.uniform(img.rows/4, img.rows*3/4);
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points.push_back(pt);
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}
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vector<int> hull;
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convexHull(Mat(points), hull, true);
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img = Scalar::all(0);
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for( i = 0; i < count; i++ )
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circle(img, points[i], 3, Scalar(0, 0, 255), CV_FILLED, CV_AA);
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int hullcount = (int)hull.size();
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Point pt0 = points[hull[hullcount-1]];
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for( i = 0; i < hullcount; i++ )
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{
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Point pt = points[hull[i]];
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line(img, pt0, pt, Scalar(0, 255, 0), 1, CV_AA);
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pt0 = pt;
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}
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imshow("hull", img);
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key = (char)waitKey();
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if( key == 27 || key == 'q' || key == 'Q' ) // 'ESC'
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break;
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}
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return 0;
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}
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