Table 2. Accuracy analysis for the three methods (normalized value)

Metrics (average)	COM	SSA	Proposed method
MSE	7.20	1.80	1.20
RMSE	2.68	1.34	1.09
Euclidean distance	2.63	1.28	1.08

COM, Center-of-Mass; SSA, sieve search centroiding algorithm; MSE, mean square error; RMSE, root mean square error.