Table 9. Comparison of impact of color variations.

Color	Scanner	Target Distance	Mean Value	Relative Error
		(mm)	${\stackrel{-}{\mathit{x}}}_{\mathit{M}}$ (mm)	${\stackrel{-}{\mathit{\eta }}}_{\mathit{M}}$ (%)
Red	URG-04LX [19]	1500	1476	1.60
	URG-04LX [22]	3600	3648	-1.33
	UTM-30LX [29]	1500	1489	0.73
Black	URG-04LX [19]	1500	1485	1.00
	URG-04LX [22]	3600	3649	-1.36
	UTM-30LX [28]	1500	1504	-0.27
	UTM-30LX [29]	1500	1492	0.53
White	URG-04LX [19]	1500	1480	1.33
	URG-04LX [22]	3600	3649.9	-1.39
	UTM-30LX [29]	1500	1483	1.13
Green	URG-04LX [19]	1500	1470	2.00
	UTM-30LX [29]	1500	1489	0.73