Table 3.

Instance-level evaluation of the thresholding method ¹⁶ and the proposed method.

Methods	Bubble numbers						Instance-level recall
	≥ 0.5	≥ 0.6	≥ 0.7	≥ 0.8	≥ 0.9	GT	RI0.5	RI0.6	RI0.7	RI0.8	RI0.9
Thresholding	371	283	184	98	19	685	0.54	0.41	0.27	0.14	0.03
Proposed	631	620	599	552	411	685	0.92	0.91	0.87	0.81	0.60