Hierarchical Artificial Bee Colony Optimizer with Divide-and-Conquer and Crossover for Multilevel Threshold Image Segmentation

Table 7

Objective values and thresholds by the Otsu method and their PRI.

Image	= 2			= 3			= 4
	Objective values	Optimal thresholds	PRI	Objective values	Optimal thresholds	PRI	Objective values	Optimal thresholds	PRI
38092		101,180	0.74248		77,132,190	0.78598		64,111,152,197	0.7994
14037		61,128	0.73614		33,77,131	0.8019		33,73,109,147	0.79968
24077		81,175	0.6821		66,126,199	0.73976		63,112,163,217	0.7637
163085		69,110	0.61394		57,85,119	0.65081		52,77,102,132	0.6706
101085		87,174	0.63896		58,113,184	0.70822		47,90,140,200	0.73810
101087		107,196	0.76849		89,135,206	0.81706		67,105,144,209	0.84213
Mean CPU time	1.4427			61.421			2644.543