Enveloppe convexe : ConvexHull

Moi j'ai utilisé la fonction cvconvexhull2 pour dessiner.
Voila le code :
Code:
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#include <iostream>
#include <cv.h>
#include <highgui.h>
using namespace std;
 
int main()
{  IplImage *img=cvLoadImage(votre image);
   IplImage *image ;
    CvMemStorage* storage=cvCreateMemStorage();
    int i, count = rand()%100 + 1, hullcount;
       CvPoint pt0;
       CvSeq* ptseq = cvCreateSeq( CV_SEQ_KIND_GENERIC|CV_32SC2,sizeof(CvContour),sizeof(CvPoint),storage );
       CvSeq* hull;
       for( i = 0; i < count; i++ )
       { pt0.x = rand() % (img->width/2) + img->width/4;
         pt0.y = rand() % (img->height/2) + img->height/4;
        cvSeqPush( ptseq, &pt0 );}
 IplImage*    g_gray = NULL;
int        g_thresh = 100;
CvMemStorage*     g_storage = NULL;
CvMemStorage* g=NULL ;
 
     if( g_storage == NULL ){
                g_gray = cvCreateImage( cvGetSize( img ), 8, 1 );
                g_storage = cvCreateMemStorage(0);
        } else {
                cvClearMemStorage( g_storage );
        }
 
        CvSeq* contours =0;
        cvCvtColor( img, g_gray, CV_BGR2GRAY );
        cvThreshold( g_gray, g_gray, g_thresh, 255, CV_THRESH_BINARY );
        cvFindContours( g_gray, g_storage, &contours );
        // hull = cvConvexHull2( contours, 0, CV_CLOCKWISE, 0 );
         CvSeq  *li=cvConvexityDefects(contours,hull,g) ;
          for(int i=0;i<li->total;i++)
         {CvPoint* q = (CvPoint*)cvGetSeqElem ( contours, i );
              int  k=q->x ;
               int v=q->y ;
             CvScalar pix=cvGet2D(img,v,k) ;
                pix.val[0]=0 ;
               pix.val[1]=0;
                pix.val[2]=255 ;
               cvSet2D(img,v,k,pix);
                 }
 
 
 
         hullcount = hull->total;
 
          pt0 = **CV_GET_SEQ_ELEM( CvPoint*, hull, hullcount - 1 );
         for( i = 0; i < hullcount; i++ )
         {  CvPoint pt = **CV_GET_SEQ_ELEM( CvPoint*, hull, i );
            cvLine( img, pt0, pt, CV_RGB( 0, 255, 0 ));
               pt0 = pt; }
                cvNamedWindow("ma fan",CV_WINDOW_AUTOSIZE);
 
      cvShowImage("ma fan",img);
 
      cvWaitKey(0);
      cvDestroyAllWindows();
      cvReleaseImage(&img);
}
J’espère que je vous ai répondu.
Bon courage.