code: @Override
  	public void getCenter(int which, Point2D_F64 location) {
  		CalibrationObservation view = detector.getDetectedPoints();
  
  		location.set(0,0);
  		for (int i = 0; i < view.size(); i++) {
  			PointIndex2D_F64 p = view.get(i);
  			location.x += p.x;
  			location.y += p.y;
  		}
  
  		location.x /= view.size();
  		location.y /= view.size();
  	}
docs: Returns the detection point average location.  This will NOT be the same as the geometric center.
  
  @param which Fiducial's index
  @param location (output) Storage for the transform. modified.