docs: boolean sanityCheck(Intrinsic calib ) {
  		if(UtilEjml.isUncountable(calib.fx))
  			return false;
  		if(UtilEjml.isUncountable(calib.fy))
  			return false;
  		if(UtilEjml.isUncountable(calib.skew))
  			return false;
  
  		if( calib.fx < 0 )
  			return false;
  		if( calib.fy < 0 )
  			return false;
  
  		return true;
  	}