| Image | [24] | [25] | [26] | proposed |
| Lena | 55.04 | 56.29 | 57.32 | 58.47 |
| Baboon | 49.38 | 50.11 | 50.45 | 50.52 |
| Barbara | 55.05 | 56.25 | 57.72 | 58.83 |
| Airplane | 57.33 | 60.21 | 60.47 | 61.04 |
| Elaine | 52.00 | 52.91 | 53.68 | 55.11 |
| Lake | 52.72 | 53.79 | 54.57 | 56.98 |
| Boat | 52.64 | 53.32 | 54.11 | 55.31 |
| Peppers | 52.31 | 52.83 | 54.99 | 57.03 |
| Average | 53.31 | 54.46 | 55.41 | 56.66 |