Table 1 The standard deviation estimate of each sub-band coefficients
From: The UDWT image denoising method based on the PDE model of a convexity-preserving diffusion function
Test image | Noiseless height frequency sub-band standard deviation | High-frequency noisy sub-band | Noiseless low-frequency sub-band standard deviation | High-frequency noisy sub-band | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
30 dB noise | 50 dB noise | 30 dB noise | 50 dB noise | |||||||
Standard deviation | Disparity | Standard deviation | Disparity | Standard deviation | Disparity | Standard deviation | Disparity | |||
Tank | 6.341 | 8.946 | 2.605 | 12.372 | 6.031 | 134.649 | 134.648 | 0.001 | 134.764 | 0.115 |
5.973 | 14.507 | 8.534 | 22.912 | 16.939 | ||||||
5.494 | 27.205 | 21.711 | 44.715 | 39.221 | ||||||
Elaine | 7.684 | 9.956 | 2.272 | 13.203 | 5.519 | 143.211 | 143.21 | 0.001 | 143.521 | 0.31 |
4.912 | 14.125 | 9.213 | 22.777 | 17.865 | ||||||
5.553 | 27.301 | 21.748 | 44.828 | 39.275 | ||||||
Sea | 7.218 | 9.581 | 2.363 | 12.911 | 5.693 | 119.241 | 119.246 | 0.005 | 119.429 | 0.188 |
7.264 | 15.101 | 7.837 | 23.332 | 16.068 | ||||||
6.142 | 27.345 | 21.203 | 44.913 | 38.771 | ||||||