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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