Table 1. Calculated signal-to-noise ratio data from examined filters according to artificial Gaussian noise (standard deviation (SD)) in synthetic images.
Image/filter | Gaussian noise |
|||
SD = 10 | SD = 20 | SD = 30 | SD = 40 | |
Unprocessed | 2.22 | 1.36 | 1.09 | 0.94 |
Gauss 3 × 3/0.4 | 6.88 | 4.16 | 3.3 | 2.83 |
Gauss 5 × 5/0.4 | 11.31 | 6.87 | 5.38 | 4.62 |
Mean 3 × 3 | 6.67 | 4.03 | 2.91 | 2.73 |
Mean 5 × 5 | 11.13 | 6.76 | 5.33 | 4.56 |
Median 3 × 3 | 5.84 | 2.81 | 1.9 | 1.46 |
Median 5 × 5 | 10.18 | 4.7 | 3.01 | 2.19 |