Table 1.

Error analysis of different concentric circle tests.

Number of Circles	Measured Coordinates (pixel)		True Coordinates (pixel)		Error (pixel)		Time
	$\mathit{u}$	$\mathit{\nu }$	$\mathit{u}$	$\mathit{\nu }$	$\mathit{u}$	$\mathit{\nu }$	(ms)
2	855.620117	855.671021	856	856	0.379883	0.328979	3707
4	855.615845	855.675781	856	856	0.384155	0.324219	3885
6	855.619934	855.677551	856	856	0.380066	0.322449	4134
8	855.619080	855.677856	856	856	0.380920	0.322144	4337
10	855.618164	855.677368	856	856	0.381836	0.322632	4477
12	855.611511	855.672791	856	856	0.388489	0.327209	4849
14	855.605957	855.669495	856	856	0.394043	0.330505	5184