Research Article
Modified Discrete Grey Wolf Optimizer Algorithm for Multilevel Image Thresholding
Table 3
The comparison of MDGWO’s efficiency between Otsu and Kapur.
| Image | | Otsu thresholds | PSNR | Kapur thresholds | PSNR |
| Cameraman | 2 | 70 | 144 | | | | 11.9475 | 44 | 106 | | | | 14.4629 | 3 | 58 | 119 | 156 | | | 12.9933 | 44 | 98 | 148 | | | 19.9337 | 4 | 40 | 93 | 139 | 170 | | 16.0180 | 39 | 83 | 119 | 156 | | 21.1684 | 5 | 35 | 81 | 121 | 149 | 174 | 16.3710 | 23 | 58 | 94 | 125 | 159 | 23.1191 |
| Lena | 2 | 92 | 151 | | | | 13.1029 | 93 | 163 | | | | 14.7164 | 3 | 80 | 126 | 171 | | | 15.7626 | 70 | 121 | 172 | | | 17.5144 | 4 | 75 | 114 | 145 | 180 | | 16.4291 | 43 | 81 | 127 | 171 | | 20.1729 | 5 | 73 | 109 | 136 | 161 | 189 | 16.7206 | 41 | 73 | 103 | 141 | 178 | 21.8208 |
| Baboon | 2 | 97 | 149 | | | | 12.4396 | 78 | 141 | | | | 16.0302 | 3 | 83 | 123 | 160 | | | 13.7731 | 46 | 103 | 151 | | | 18.6340 | 4 | 70 | 105 | 136 | 167 | | 14.9493 | 34 | 75 | 117 | 159 | | 20.5198 | 5 | 66 | 98 | 125 | 150 | 175 | 16.0012 | 29 | 64 | 100 | 134 | 170 | 22.0929 |
| Butterfly | 2 | 100 | 152 | | | | 12.4400 | 87 | 150 | | | | 14.9325 | 3 | 81 | 118 | 159 | | | 14.2563 | 62 | 104 | 152 | | | 18.5539 | 4 | 73 | 101 | 129 | 164 | | 14.6987 | 49 | 88 | 128 | 168 | | 21.0711 | 5 | 69 | 95 | 121 | 149 | 177 | 16.4688 | 48 | 80 | 113 | 145 | 180 | 22.4539 |
| Maize | 2 | 92 | 168 | | | | 13.6677 | 84 | 165 | | | | 14.0407 | 3 | 76 | 128 | 187 | | | 15.2676 | 59 | 113 | 171 | | | 16.5853 | 4 | 65 | 104 | 150 | 200 | | 16.7309 | 45 | 80 | 125 | 187 | | 18.9818 | 5 | 56 | 86 | 123 | 164 | 208 | 18.5649 | 39 | 74 | 108 | 147 | 198 | 20.8792 |
| Sea Star | 2 | 85 | 157 | | | | 14.8445 | 81 | 160 | | | | 14.8595 | 3 | 69 | 120 | 178 | | | 17.6040 | 60 | 111 | 172 | | | 17.4583 | 4 | 59 | 99 | 137 | 187 | | 19.4039 | 46 | 89 | 131 | 184 | | 19.4487 | 5 | 51 | 85 | 117 | 150 | 193 | 21.4000 | 47 | 83 | 118 | 150 | 196 | 20.9681 |
| Smiling Girl | 2 | 60 | 123 | | | | 13.1358 | 88 | 145 | | | | 18.0033 | 3 | 47 | 100 | 131 | | | 12.8470 | 44 | 91 | 145 | | | 19.1148 | 4 | 28 | 74 | 111 | 136 | | 15.6914 | 24 | 67 | 100 | 145 | | 20.0759 | 5 | 20 | 63 | 95 | 124 | 158 | 18. 2260 | 44 | 83 | 115 | 152 | 203 | 21.7937 |
| Surfer | 2 | 92 | 162 | | | | 12.5401 | 52 | 141 | | | | 16.4343 | 3 | 71 | 111 | 177 | | | 16.0569 | 52 | 103 | 168 | | | 18.9343 | 4 | 47 | 81 | 118 | 179 | | 20.8786 | 49 | 86 | 131 | 185 | | 20.7218 | 5 | 46 | 77 | 105 | 143 | 196 | 21.6071 | 24 | 53 | 88 | 126 | 183 | 21.8961 |
|
|