Table 1 Comparison of various denoising methods by PSNR (dB)
Methods | Noise variance | |||||
|---|---|---|---|---|---|---|
| Â | 15 | 20 | 25 | 30 | 40 | 50 |
Image 1 | Â | |||||
 Noisy image | 24.87 | 22.40 | 20.78 | 18.19 | 16.69 | 14.91 |
 VisuShrink | 22.93 | 21.51 | 21.49 | 19.71 | 19.90 | 17.90 |
 NeighShrink | 25.23 | 23.43 | 22.89 | 21.93 | 20.63 | 19.58 |
 BiShrink | 25.32 | 24.48 | 23.19 | 23.58 | 22.43 | 21.93 |
 Proposed algorithm | 26.24 | 25.65 | 25.02 | 24.36 | 23.12 | 22.99 |
Image 2 | Â | |||||
 Noisy image | 24.90 | 22.42 | 20.76 | 18.18 | 16.64 | 14.82 |
 VisuShrink | 24.28 | 21.72 | 21.68 | 20.82 | 20.01 | 19.65 |
 NeighShrink | 27.37 | 24.95 | 24.02 | 22.31 | 19.80 | 23.12 |
 BiShrink | 26.74 | 25.47 | 25.01 | 20.48 | 23.40 | 23.53 |
 Proposed algorithm | 27.74 | 25.34 | 24.90 | 23.95 | 23.36 | 22.63 |
Image 3 | Â | |||||
 Noisy image | 25.07 | 22.58 | 20.90 | 18.23 | 16.63 | 14.81 |
 VisuShrink | 24.25 | 22.29 | 25.04 | 22.92 | 22.65 | 21.87 |
 NeighShrink | 27.32 | 26.26 | 25.45 | 22.59 | 22.46 | 19.13 |
 BiShrink | 28.22 | 27.37 | 25.15 | 23.29 | 23.26 | 23.21 |
 Proposed algorithm | 28.02 | 28.42 | 26.55 | 25.02 | 25.03 | 24.92 |