Discussion :

[sosdouble]

bonjour tout le monde j'utilise ce code là pour la segmentation d'une image en se basant sur la détection de contour mais quand je veux isoler chaque contour détecté a l'aide d'une image ROI j'ai eu une fenêtre noir ,quelqu'un peut m'aider a trouver une solution?!!

voilà le code:
IplImage *img_cv = cvLoadImage("lena.jpg",CV_LOAD_IMAGE_GRAYSCALE);



IplImage *img_pl = cvCreateImage( cvGetSize(img_cv),img_cv->depth,img_cv->nChannels);

cvCopy(img_cv,img_pl, NULL);

//Smooth image
cvSmooth(img_pl, img_pl, CV_GAUSSIAN, 3, 0, 0, 0);

// threshold image
cvThreshold(img_pl, img_pl, 150, 255, CV_THRESH_BINARY_INV);

//Morfologic filters
//Ouverture :érosion suivie d'une dilatation
cvErode(img_pl, img_pl, NULL,1);
cvDilate(img_pl, img_pl, NULL,1);



//Init variables for countours

CvSeq* contour2;



contour2 = 0;



IplImage* img_contornos;
CvSeq* contourLow;
contourLow = 0;

//Duplicate image for countour
img_contornos=cvCloneImage(img_pl);

//Create storage needed for contour detection
CvMemStorage* storage2 = cvCreateMemStorage(0);

//Search countours in preprocesed image
cvFindContours( img_contornos, storage2, &contour2, sizeof(CvContour),
CV_RETR_EXTERNAL, CV_CHAIN_APPROX_SIMPLE, cvPoint(0, 0) );

//Optimize contours, reduce points
contourLow=cvApproxPoly(contour2, sizeof(CvContour), storage2,CV_POLY_APPROX_DP,0,1);

//For each contour found
for( ; contourLow != 0; contourLow = contourLow->h_next ){

//We can draw the contour of object
cvDrawContours( img_contornos, contourLow, CV_RGB(0,255,0), CV_RGB(0,255,0), -1, 0, 8, cvPoint(0,0) );

printf( " %d elements:\n", contourLow -> total );
for( int i = 0; i < contourLow -> total; ++i )
{
CvPoint* pt = CV_GET_SEQ_ELEM( CvPoint, contourLow, i );
// printf( " %d, %d", pt -> x, pt -> y );

CvRect rect;
CvPoint pt1, pt2;
rect=cvBoundingRect(contourLow, NULL);
pt1.x = rect.x;
pt2.x = (rect.x+rect.width);
pt1.y = rect.y;
pt2.y = (rect.y+rect.height);
cvRectangle(img_cv, pt1,pt2, CV_RGB(0,255,0), 1, 8, 0);

cvSetImageROI(img_contornos,cvRect(pt1.x,pt1.y,50,80));
IplImage *img_rect = cvCreateImage( cvGetSize(img_contornos),img_contornos->depth,img_contornos->nChannels);

cvCopy(img_contornos, img_rect, NULL);
cvNamedWindow("segment",CV_WINDOW_AUTOSIZE);
cvShowImage("segment",img_rect);
cvResetImageROI(img_contornos);

}}


cvNamedWindow("pla",CV_WINDOW_AUTOSIZE);
cvShowImage("pla",img_cv);
cvResetImageROI(img_cv);
cvReleaseImage( &img_cv );