Improved Bat Algorithm Applied to Multilevel Image Thresholding

Table 1

Thresholds, objective function values, and time processing provided by the exhaustive search for Kapur’s method.

Images	𝐾	Threshold values	Objective function	Time (ms)
Barbara	2	96, 168	12.668336540	25
	3	76, 127, 178	15.747087798	341
	4	60, 99, 141, 185	18.556786861	11103
	5	58, 95, 133, 172, 210	21.245645310	666869
Living room	2	94, 175	12.405985592	31
	3	47, 103, 175	15.552622213	339
	4	47, 98, 149, 197	18.471055578	12612
	5	42, 85, 124, 162, 197	21.150302316	478114
Boats	2	107, 176	12.574798244	25
	3	64, 119, 176	15.820902860	342
	4	48, 88, 128, 181	18.655733570	11461
	5	48, 88, 128, 174, 202	21.401608305	469862
Goldhill	2	90, 157	12.546393623	24
	3	78, 131, 177	15.607747002	329
	4	65, 105, 147, 189	18.414213765	11958
	5	59, 95, 131, 165, 199	21.099138996	399458
Lake	2	91, 163	12.520359742	24
	3	72, 119, 169	15.566286745	336
	4	70, 111, 155, 194	18.365636309	12658
	5	64, 99, 133, 167, 199	21.024982760	410753
Aerial	2	68, 159	12.538208248	29
	3	68, 130, 186	15.751881495	347
	4	68, 117, 159, 200	18.615899102	11390
	5	68, 108, 141, 174, 207	21.210455499	599570