The Scientific World Journal / 2014 / Article / Tab 2

Research Article

Improved Bat Algorithm Applied to Multilevel Image Thresholding

Table 2

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

Images Threshold values Objective function Time (ms)

Barbara 2 82, 147 2608.610778507 39
3 75, 127, 176 2785.163280467 89
4 66, 106, 142, 182 2856.262131671 3014
5 57, 88, 118, 148, 184 2890.976609405 100079

Living room 2 87, 145 1627.909172752 39
3 76, 123, 163 1760.103018395 88
4 56, 97, 132, 168 1828.864376614 2945
5 49, 88, 120, 146, 178 1871.990616316 130397

Boats 2 93, 155 1863.346730649 38
3 73, 126, 167 1994.536306242 89
4 65, 114, 147, 179 2059.866280428 2931
5 51, 90, 126, 152, 183 2092.775965336 75879

Goldhill 2 94, 161 2069.510202452 38
3 83, 126, 179 2220.372641501 88
4 69, 102, 138, 186 2295.380469158 2775
5 63, 91, 117, 147, 191 2331.156597921 74674

Lake 2 85, 154 3974.738214185 39
3 78, 140, 1944112.631097687 89
4 67, 110, 158, 198 4180.886161109 2613
5 57, 88, 127, 166, 200 4216.943583790 73019

Aerial 2 125, 178 1808.171050536 46
3 109, 147, 190 1905.410606582 103
4 104, 134, 167, 202 1957.017965982 2670
5 99, 123, 148, 175, 205 1980.656737348 99880

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