Table 1. Original and refined histograms bin sizes and selected threshold values of them by thresholding methods, and IoU criteria values are shown.
Methods | Median | Otsu |
Test images\Types of histogram | Original | Refined | Original | Refined |
Image 1DIBCO2019 track A | Bin number | 256 | 24,330 | 256 | 24,330 |
Threshold T= | 112 | 12,165 | 188 | 14,966 |
IoU | 0.94 | 0.92 | 0.91 | 0.88 |
Image 2DIBCO2019 track A | Bin number | 256 | 26,658 | 256 | 26,658 |
Threshold T= | 123 | 13,329 | 113 | 15,393 |
IoU | 0.23 | 0.96 | 0.97 | 0.94 |
Image 3Brodatz(#D34) | Bin number | 256 | 5,792 | 256 | 5,792 |
Threshold T= | 122 | 2,896 | 104 | 1,972 |
IoU | 0.23 | 0.68 | 0.29 | 0.87 |
Image 4Brodatz(#D42) | Bin number | 256 | 15,192 | 256 | 15,192 |
Threshold T= | 118 | 7,596 | 131 | 6,449 |
IoU | 0.49 | 0.58 | 0.49 | 0.66 |
Image 5 | Bin number | 256 | 6,583 | 256 | 6,583 |
Threshold T= | 111 | 3,291 | 68 | 2,276 |
IoU | 0.26 | 0.51 | 0.64 | 0.75 |
Image 6 | Bin number | 256 | 12,193 | 256 | 12,193 |
Threshold T= | 128 | 6,096 | 97 | 4,958 |
IoU | 0.67 | 0.83 | 0.93 | 0.94 |