95 lines
3.1 KiB
C++
95 lines
3.1 KiB
C++
#include "opencv2/imgproc/imgproc.hpp"
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#include "opencv2/highgui/highgui.hpp"
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#include <math.h>
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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
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<< "\nThis program illustrates the use of findContours and drawContours\n"
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<< "The original image is put up along with the image of drawn contours\n"
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<< "Usage:\n"
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<< "./contours2\n"
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<< "\nA trackbar is put up which controls the contour level from -3 to 3\n"
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<< endl;
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}
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const int w = 500;
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int levels = 3;
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vector<vector<Point> > contours;
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vector<Vec4i> hierarchy;
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static void on_trackbar(int, void*)
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{
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Mat cnt_img = Mat::zeros(w, w, CV_8UC3);
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int _levels = levels - 3;
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drawContours( cnt_img, contours, _levels <= 0 ? 3 : -1, Scalar(128,255,255),
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3, LINE_AA, hierarchy, std::abs(_levels) );
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imshow("contours", cnt_img);
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}
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int main( int argc, char**)
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{
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Mat img = Mat::zeros(w, w, CV_8UC1);
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if(argc > 1)
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{
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help();
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return -1;
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}
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//Draw 6 faces
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for( int i = 0; i < 6; i++ )
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{
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int dx = (i%2)*250 - 30;
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int dy = (i/2)*150;
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const Scalar white = Scalar(255);
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const Scalar black = Scalar(0);
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if( i == 0 )
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{
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for( int j = 0; j <= 10; j++ )
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{
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double angle = (j+5)*CV_PI/21;
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line(img, Point(cvRound(dx+100+j*10-80*cos(angle)),
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cvRound(dy+100-90*sin(angle))),
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Point(cvRound(dx+100+j*10-30*cos(angle)),
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cvRound(dy+100-30*sin(angle))), white, 1, 8, 0);
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}
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}
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ellipse( img, Point(dx+150, dy+100), Size(100,70), 0, 0, 360, white, -1, 8, 0 );
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ellipse( img, Point(dx+115, dy+70), Size(30,20), 0, 0, 360, black, -1, 8, 0 );
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ellipse( img, Point(dx+185, dy+70), Size(30,20), 0, 0, 360, black, -1, 8, 0 );
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ellipse( img, Point(dx+115, dy+70), Size(15,15), 0, 0, 360, white, -1, 8, 0 );
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ellipse( img, Point(dx+185, dy+70), Size(15,15), 0, 0, 360, white, -1, 8, 0 );
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ellipse( img, Point(dx+115, dy+70), Size(5,5), 0, 0, 360, black, -1, 8, 0 );
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ellipse( img, Point(dx+185, dy+70), Size(5,5), 0, 0, 360, black, -1, 8, 0 );
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ellipse( img, Point(dx+150, dy+100), Size(10,5), 0, 0, 360, black, -1, 8, 0 );
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ellipse( img, Point(dx+150, dy+150), Size(40,10), 0, 0, 360, black, -1, 8, 0 );
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ellipse( img, Point(dx+27, dy+100), Size(20,35), 0, 0, 360, white, -1, 8, 0 );
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ellipse( img, Point(dx+273, dy+100), Size(20,35), 0, 0, 360, white, -1, 8, 0 );
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}
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//show the faces
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namedWindow( "image", 1 );
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imshow( "image", img );
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//Extract the contours so that
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vector<vector<Point> > contours0;
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findContours( img, contours0, hierarchy, RETR_TREE, CHAIN_APPROX_SIMPLE);
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contours.resize(contours0.size());
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for( size_t k = 0; k < contours0.size(); k++ )
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approxPolyDP(Mat(contours0[k]), contours[k], 3, true);
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namedWindow( "contours", 1 );
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createTrackbar( "levels+3", "contours", &levels, 7, on_trackbar );
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on_trackbar(0,0);
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waitKey();
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return 0;
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}
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