TABLE I.
Example 1 - Signal to Noise Ratio (SNR): Comparison of New Method with other standard wavelet denoising methods at 16 and 4 scans. Hard and Soft represent hard and soft thresholding, respectively; dB is SNR in decibels; and DL is Decomposition Level (cf. Figures 3–8).
| Method | 16 scans | 4 scans | ||||||
|---|---|---|---|---|---|---|---|---|
|
| ||||||||
| SNR (dB) | SNR | SSIM | DL | SNR (dB) | SNR | SSIM | DL | |
|
| ||||||||
| Noisy | 35 | 57 | 0.9903 | - | 30 | 32 | 0.9684 | - |
| Minimax-Hard | 43 | 146 | 0.9959 | 7 | 38 | 81 | 0.9880 | 7 |
| Minimax-Soft | 46 | 201 | 0.9954 | 7 | 41 | 114 | 0.9890 | 12 |
| SUREShrink-Hard | 38 | 82 | 0.9938 | 9 | 32 | 41 | 0.9779 | 9 |
| SUREShrink-Soft | 44 | 157 | 0.9966 | 7 | 37 | 77 | 0.9905 | 12 |
| Zhao [9] | 46 | 209 | 0.9821 | 6 | 38 | 80 | 0.9790 | 6 |
| Poornachandra [38] | 44 | 167 | 0.9825 | 6 | 37 | 73 | 0.9803 | 6 |
| Zhang [39] | 46 | 209 | 0.9821 | 6 | 38 | 80 | 0.9778 | 6 |
| Lin [37] | 44 | 167 | 0.9825 | 6 | 38 | 79 | 0.9800 | 6 |
| New Method | 73 | 4438 | 0.9969 | 6 | 64 | 1567 | 0.9957 | 6 |