docs: public List<PointIndex2D_F64> getLandmarkByIndex( QrCode qr) {
  		pixelControl.get(0).set(qr.ppCorner.get(0));
  		pixelControl.get(1).set(qr.ppCorner.get(1));
  		pixelControl.get(2).set(qr.ppCorner.get(2));
  		pixelControl.get(3).set(qr.ppCorner.get(3));
  
  		pixelControl.get(4).set(qr.ppRight.get(0));
  		pixelControl.get(5).set(qr.ppRight.get(1));
  		pixelControl.get(6).set(qr.ppRight.get(2));
  		pixelControl.get(7).set(qr.ppRight.get(3));
  
  		pixelControl.get(8).set(qr.ppDown.get(0));
  		pixelControl.get(9).set(qr.ppDown.get(1));
  		pixelControl.get(10).set(qr.ppDown.get(2));
  		pixelControl.get(11).set(qr.ppDown.get(3));
  
  		// put it back into distorted pixels. Required by FiducialDetectorPnP
  		for (int i = 0; i < pixelControl.size(); i++) {
  			PointIndex2D_F64 p = pixelControl.get(i);
  			undistToDist.compute(p.x,p.y,p);
  		}
  
  		return pixelControl;
  	}