Hi together, so I got a little problem.

I got a webcam, and the with many other tutorials I managed to convert its OpenCv Image to an QImage. For displaying it to the desktop I use a GraphicsView.
The QImage gets put into a QGraphicsScene, and this finally gets showed in the GraphicsView.
A QTimer which is activated every 100ms, catchs a Image from the Wcam, transfers it to a QImage. And then it gets showed.
But now the Problem is that the picture in the viewer isn't fluid. The transfering from OpenCv to QImage isnt a problem. I think theres a problem with updating the qimage,scene or viewer.

out of CameraCalibrator.cpp
Qt Code: 
  1. bool CameraCalibrator::refreshImage()
  2. {   
  3. 	IplImage* img = mCam->grab();
  4. 	if (img)
  5. 	{
  6. 	  mScene->addPixmap(QPixmap::fromImage(IplImageToQImage(img))); 
  7. 	  mScene->update(0,0,mScene->width(),mScene->height());
  8. 	  return true;
  9. 	}
  10. 	return false;
  11. }
  12.  
  13. bool CameraCalibrator::Connect()
  14. {
  15. 	mCam->vrmLogger();
  16. 	if (mCam->connect())
  17. 	{
  18. 		IplImage* iImage = mCam->grab();
  19. 		mScene = new QGraphicsScene(this);
  20. 		mScene->addPixmap(QPixmap::fromImage(IplImageToQImage(iImage))); 
  21. 		resize(width()+(mScene->width()- mViewer->width()),height()+(mScene->height()-mViewer->height()));
  22. 		mViewer->setScene(mScene);
  23. 		mViewer->setViewportUpdateMode(QGraphicsView::FullViewportUpdate);
  24. 		mActionLoad->setEnabled(true);
  25. 		mActionSave->setEnabled(true);
  26. 		mActionMatch->setEnabled(true);
  27. 		mTimer = new QTimer();
  28. 		connect(mTimer, SIGNAL(timeout()), this, SLOT(refreshImage()));
  29. 		mTimer->start(1000/10);
  30. 		return true;
  31. 	}
  32. 	else
  33. 	{
  34. 		mActionLoad->setEnabled(false);
  35. 		mActionSave->setEnabled(false);
  36. 		mActionMatch->setEnabled(false);
  37. 		return false;
  38. 	}
  39. }
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out of CameraCalibrator.h
Qt Code: 
  1. QTimer* mTimer;
  2. 	QGraphicsView* mViewer;
  3. 	QGraphicsScene* mScene;
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These are the two important functions. Does anyone else see the failure?
I really dont get it.