Table 5.

Runtime of proposed methods with the optimal parameters.

Methods	Time of dictionary learning	Time of recognizing one VOI
SR1	13520 s (K-SVD)	1.27 s (OMP)
SR2	241 s (K-Means)	0.29 s (OMP)
SR3	350 s (K-Means)	0.13 s (OMP1)