σ | BM3D | DNCNN | FFDNET | IRCNN |
15 | 0.9361 | 0.9335 | 0.9339 | 0.9337 |
25 | 0.8892 | 0.8898 | 0.8907 | 0.8902 |
30 | 0.8676 | 0.8701 | 0.8711 | 0.8704 |