Improved Bat Algorithm Applied to Multilevel Image Thresholding

Table 9

The number of evaluations for all test images and all threshold values for Otsu’s method.

Alg.	Trsh. 2	Trsh. 3	Trsh. 4	Trsh. 5	Total
PSO	56	85	665	25206	3326
DE	95	294	1164	4245	5798
CS	1323	2322	3669	5665	12979
FA	72	171	230	889	1362
BA	10	40	196	2110	2356
IBA	53	99	158	249	559