103 lines
3.5 KiB
C
103 lines
3.5 KiB
C
#include <opencv2/imgproc/imgproc_c.h>
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#include "opencv2/highgui/highgui.hpp"
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#include <stdio.h>
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void help()
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{
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printf("\nThis program creates an image to demonstrate the use of the \"c\" contour\n"
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"functions: cvFindContours() and cvApproxPoly() along with the storage\n"
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"functions cvCreateMemStorage() and cvDrawContours().\n"
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"It also shows the use of a trackbar to control contour retrieval.\n"
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"\n"
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"Call:\n"
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"./contours\n");
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}
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#define w 500
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int levels = 3;
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CvSeq* contours = 0;
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void on_trackbar(int pos)
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{
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IplImage* cnt_img = cvCreateImage( cvSize(w,w), 8, 3 );
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CvSeq* _contours = contours;
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int _levels = levels - 3;
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if( _levels <= 0 ) // get to the nearest face to make it look more funny
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_contours = _contours->h_next->h_next->h_next;
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cvZero( cnt_img );
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cvDrawContours( cnt_img, _contours, CV_RGB(255,0,0), CV_RGB(0,255,0), _levels, 3, CV_AA, cvPoint(0,0) );
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cvShowImage( "contours", cnt_img );
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cvReleaseImage( &cnt_img );
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}
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int main( int argc, char** argv )
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{
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int i, j;
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CvMemStorage* storage = cvCreateMemStorage(0);
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IplImage* img = cvCreateImage( cvSize(w,w), 8, 1 );
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help();
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cvZero( img );
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for( 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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CvScalar white = cvRealScalar(255);
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CvScalar black = cvRealScalar(0);
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if( i == 0 )
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{
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for( j = 0; j <= 10; j++ )
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{
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double angle = (j+5)*CV_PI/21;
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cvLine(img, cvPoint(cvRound(dx+100+j*10-80*cos(angle)),
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cvRound(dy+100-90*sin(angle))),
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cvPoint(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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cvEllipse( img, cvPoint(dx+150, dy+100), cvSize(100,70), 0, 0, 360, white, -1, 8, 0 );
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cvEllipse( img, cvPoint(dx+115, dy+70), cvSize(30,20), 0, 0, 360, black, -1, 8, 0 );
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cvEllipse( img, cvPoint(dx+185, dy+70), cvSize(30,20), 0, 0, 360, black, -1, 8, 0 );
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cvEllipse( img, cvPoint(dx+115, dy+70), cvSize(15,15), 0, 0, 360, white, -1, 8, 0 );
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cvEllipse( img, cvPoint(dx+185, dy+70), cvSize(15,15), 0, 0, 360, white, -1, 8, 0 );
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cvEllipse( img, cvPoint(dx+115, dy+70), cvSize(5,5), 0, 0, 360, black, -1, 8, 0 );
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cvEllipse( img, cvPoint(dx+185, dy+70), cvSize(5,5), 0, 0, 360, black, -1, 8, 0 );
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cvEllipse( img, cvPoint(dx+150, dy+100), cvSize(10,5), 0, 0, 360, black, -1, 8, 0 );
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cvEllipse( img, cvPoint(dx+150, dy+150), cvSize(40,10), 0, 0, 360, black, -1, 8, 0 );
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cvEllipse( img, cvPoint(dx+27, dy+100), cvSize(20,35), 0, 0, 360, white, -1, 8, 0 );
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cvEllipse( img, cvPoint(dx+273, dy+100), cvSize(20,35), 0, 0, 360, white, -1, 8, 0 );
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}
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cvNamedWindow( "image", 1 );
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cvShowImage( "image", img );
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cvFindContours( img, storage, &contours, sizeof(CvContour),
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CV_RETR_TREE, CV_CHAIN_APPROX_SIMPLE, cvPoint(0,0) );
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{
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const char* attrs[] = {"recursive", "1", 0};
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cvSave("contours.xml", contours, 0, 0, cvAttrList(attrs, 0));
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contours = (CvSeq*)cvLoad("contours.xml", storage, 0, 0);
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}
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// comment this out if you do not want approximation
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contours = cvApproxPoly( contours, sizeof(CvContour), storage, CV_POLY_APPROX_DP, 3, 1 );
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cvNamedWindow( "contours", 1 );
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cvCreateTrackbar( "levels+3", "contours", &levels, 7, on_trackbar );
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on_trackbar(0);
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cvWaitKey(0);
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cvReleaseMemStorage( &storage );
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cvReleaseImage( &img );
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return 0;
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}
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#ifdef _EiC
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main(1,"");
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#endif
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