Qt Code: 
  1. void Dialog::createCam()
  2. {
  3.     timer = new QTimer(this);
  4.     cam = cvCaptureFromCAM(-1);
  5.     if(cam==NULL)
  6.         qDebug()<<"Error: No Camera Detect.";
  7.  
  8.     timer->start(33);
  9.     connect(timer,SIGNAL(timeout()),this,SLOT(getFrame()));
  10.     connect(timer,SIGNAL(timeout()),this,SLOT(prcFrame()));
  11. }
  12.  
  13. void Dialog::getFrame()
  14. {
  15.     frame = cvQueryFrame(cam); //get what camera see
  16.     image = QImage ((const uchar*)frame->imageData,frame->width,frame->height,QImage::Format_RGB888).rgbSwapped();//rgbSwapped() make color better
  17.  
  18.     qPainter = new QPainter(&image);// all qPainter to draw rectangle on original image according to point get from Filter image
  19.     qPainter->begin(this);
  20.     qPainter->setPen(QPen(Qt::red,3,Qt::SolidLine));
  21.     qPainter->drawRect(rect.x,rect.y,rect.x+rect.width,rect.y+rect.height);
  22.     qPainter->end();
  23.     ui->original->setPixmap(QPixmap::fromImage(image));
  24.  
  25. }
  26.  
  27. void Dialog::prcFrame()
  28. {
  29.     imgHSV= cvCloneImage(frame);
  30.     cvCvtColor(frame,imgHSV,CV_BGR2HSV);
  31.     imgFilter= cvCreateImage(cvSize(frame->width,frame->height),IPL_DEPTH_8U,1);
  32.     cvInRangeS(imgHSV,cvScalar(ui->hueSlide1->value(),ui->satSlide1->value(),ui->lumSlide1->value(),0),cvScalar(ui->hueSlide2->value(),ui->satSlide2->value(),ui->lumSlide2->value(),0),imgFilter);
  33.     QImage imgThresdhed = QImage ((const uchar*)imgFilter->imageData,imgFilter->width,imgFilter->height,QImage::Format_Indexed8).rgbSwapped();
  34.     ui->filter->setPixmap(QPixmap::fromImage(imgThresdhed)); //convert to QImage and show as Filter image
  35.  
  36.     unsigned char *data_hsv= (unsigned char*)imgHSV->imageData;
  37.     int step_hsv = imgHSV->widthStep/sizeof(unsigned char), chanels_hsv=imgHSV->nChannels;
  38.     storage=cvCreateMemStorage(0);
  39.  
  40.     cvFindContours(imgFilter, storage, &contour, sizeof(CvContour), CV_RETR_EXTERNAL, CV_CHAIN_APPROX_SIMPLE,cvPoint(0,0)); //FindContours
  41.  
  42.         for(;contour;contour = contour->h_next)
  43.         {
  44.             area1=fabs(cvContourArea(contour,CV_WHOLE_SEQ,1 ));
  45.  
  46.             if(area1<100 || area1>50000 )
  47.             {
  48.                 cvSeqRemove(contour,0);
  49.                 continue;
  50.             }
  51.  
  52.             total =0;
  53.             total_S=0;
  54.             total_V=0;
  55.  
  56.             for(l = 0;l<contour->total;++l)
  57.             {
  58.                 pt = (CvPoint *)cvGetSeqElem(contour,l);
  59.                 qDebug()<<"pt"<<pt;
  60.                 H = data_hsv[step_hsv*pt->y+chanels_hsv*pt->x+0];
  61.                 qDebug()<<"H"<<H;
  62.                 S = data_hsv[step_hsv*pt->y+chanels_hsv*pt->x+1];
  63.                 qDebug()<<"S"<<S;
  64.                 V = data_hsv[step_hsv*pt->y+chanels_hsv*pt->x+2];
  65.                 qDebug()<<"V"<<V;
  66.                 total = H + total;
  67.                 total_S= S + total_S;
  68.                 total_V= V + total_V;
  69.             }
  70.  
  71.             avg = total / (contour->total);
  72.             avg_S=total_S / (contour->total);
  73.             avg_V=total_V / (contour->total);
  74.  
  75.             if((avg>=ui->hueSlide1->value())&&(avg<=ui->hueSlide2->value())&&(avg_S>=ui->satSlide1->value())&&(avg_S<=ui->satSlide2->value())&&(avg_V>=ui->lumSlide1->value())&&(avg_V<=ui->lumSlide2->value())) // compare contours size
  76.             {
  77.                 for(i = N-1; i >= 0; --i)
  78.                 {
  79.                   if(area1 > maxArea1[i])
  80.                   {
  81.                     maxArea1[i] = area1;
  82.                     contours1[i] = contour;
  83.                     for(m = (i-1); m >= 0; --m)
  84.                     {
  85.                        if(maxArea1[m] < maxArea1[m+1])
  86.                        {
  87.                          tmp_area1 = maxArea1[m+1];
  88.                          tmp_cont = contours1[m+1];
  89.                          maxArea1[m+1] = maxArea1[m];
  90.                          contours1[m+1] = contours1[m];
  91.                          maxArea1[m] = tmp_area1;
  92.                          contours1[m] = tmp_cont;
  93.                         }
  94.                     }
  95.                   break;
  96.                   }
  97.                 }
  98.             }
  99.         }
  100.        rect = ((CvContour*)contours1[0])->rect; //rect point
  101.  
  102.  
  103.         cvReleaseMemStorage(&storage);
  104.         cvReleaseImage(&imgFilter);
  105.         cvReleaseImage(&imgHSV);
  106. }
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