Table 5. Comparison of range measurements.

Scanner	Target Distance	Mean Value	Relative Error
	(mm)	${\stackrel{-}{\mathit{x}}}_{\mathit{M}}$(mm)	${\stackrel{-}{\mathit{\eta }}}_{\mathit{M}}$ (%)
URG-04LX [19]	1000	987	1.3
URG-04LX [22]	3600	3625	-0.7
UTM-30LX [28]	1500	1505	-0.3
UTM-30LX [38]	1200	1220	1.6