Table 4.

Optical marker comparison, triangulation error, and Euclidian distance

Optical marker detection	Triangulation error		Euclidean distance
Method	MSER	SURF	MSER	SURF
Markers amount	52	43	52	43
Mean [mm]	0.290	0.303	0.627	0.622
Standard deviation [mm]	0.124	0.133	0.101	0.107
Rms [mm]	0.315	0.331	0.635	0.631
Min [mm]	0.018	0.028	0.232	0.223
Quartile 1 [mm]	0.207	0.202	0.579	0.567
Median [mm]	0.279	0.313	0.621	0.624
Quartile 3 [mm]	0.390	0.399	0.685	0.684
Max [mm]	0.557	0.595	0.840	0.823