Table 6.
Summary of Friedman ranking test for the methods of PSNR for the COVID-19 experiment
| PSNR_rank | AO | WOA | SSA | RSA-SSA | RSA | MPA | PSO |
|---|---|---|---|---|---|---|---|
| COVID1 | 2 | 3 | 6 | 1 | 2 | 4 | 5 |
| COVID2 | 3 | 5 | 7 | 1 | 4 | 2 | 6 |
| COVID3 | 5 | 6 | 4 | 1 | 7 | 3 | 2 |
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