TABLE 3.
Pixel numbers and pixel ratio of each clutter levels.
| Clutter levels | Pixel number (PN, px) | Pixel ratio (PR, %) |
| Level 1 | 10,254 | 2.14 |
| Level 2 | 15,631 | 3.26 |
| Level 3 | 21,545 | 4.49 |
| Level 4 | 28,353 | 5.91 |
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