Table 7.
Friedman ranking test for the methods of PSNR for NORMAL experiment
| PSNR_rank | K | AO | WOA | SSA | RSA-SSA | RSA | MPA | PSO |
|---|---|---|---|---|---|---|---|---|
| NORMAL1 | 2 | 5 | 7 | 4 | 1 | 6 | 3 | 2 |
| 3 | 5 | 1 | 4 | 3 | 2 | 6 | 7 | |
| 4 | 7 | 1 | 3 | 2 | 4 | 5 | 6 | |
| 5 | 1 | 4 | 2 | 3 | 5 | 7 | 6 | |
| 6 | 2 | 7 | 3 | 4 | 1 | 6 | 5 | |
| SUM | 17 | 13 | 16 | 13 | 18 | 25 | 21 | |
| Mean rank | 3.4 | 2.6 | 3.2 | 2.6 | 3.6 | 5 | 4.2 | |
| Final rank | 3 | 1 | 2 | 1 | 4 | 6 | 5 | |
| NORMAL2 | 2 | 1 | 7 | 6 | 3 | 5 | 2 | 4 |
| 3 | 3 | 6 | 5 | 2 | 1 | 7 | 4 | |
| 4 | 7 | 1 | 2 | 4 | 6 | 5 | 3 | |
| 5 | 3 | 4 | 6 | 1 | 2 | 5 | 7 | |
| 6 | 2 | 1 | 7 | 3 | 5 | 6 | 4 | |
| SUM | 15 | 17 | 24 | 13 | 18 | 19 | 17 | |
| Mean rank | 3 | 3.4 | 4.8 | 2.6 | 3.6 | 3.8 | 3.4 | |
| Final rank | 2 | 3 | 6 | 1 | 4 | 5 | 3 | |
| NORMAL3 | 2 | 2 | 5 | 6 | 3 | 1 | 4 | 7 |
| 3 | 3 | 7 | 2 | 1 | 4 | 5 | 6 | |
| 4 | 2 | 1 | 6 | 4 | 5 | 3 | 7 | |
| 5 | 4 | 3 | 7 | 2 | 6 | 5 | 1 | |
| 6 | 7 | 4 | 6 | 3 | 5 | 2 | 1 | |
| SUM | 16 | 17 | 26 | 13 | 21 | 19 | 14 | |
| Mean rank | 3.2 | 3.4 | 5.2 | 2.6 | 4.2 | 3.8 | 2.8 | |
| Final rank | 3 | 4 | 7 | 1 | 6 | 5 | 2 |