## 4 Experiments
### Experimental Results and Analysis

Table 10: Average SSIM results of different methods on BSD50 with various noise levels. \begin{table}
\begin{tabular}{c c c c c c c} \hline \hline \multirow{2}{*}{**Method**} & \multicolumn{5}{c}{**Noise Level**} \\ \cline{2-7}  & \(\sigma\) = **10** & \(\sigma\) = **20** & \(\sigma\) = **30** & \(\sigma\) = **40** & \(\sigma\) = **50** & \(\sigma\) = **60** \\ \hline BM3D & 0.9509 & 0.9030 & 0.8680 & 0.8403 & 0.8139 & 0.7966 \\ FFDNet & 0.9545 & 0.9143 & 0.8831 & 0.8559 & 0.8323 & 0.8121 \\ NCSR & 0.9524 & 0.9038 & 0.8677 & 0.8295 & 0.8038 & 0.7794 \\ DrCNN & 0.9545 & 0.9143 & 0.8831 & 0.8559 & 0.8323 & 0.8121 \\ WNNM & 0.9527 & 0.9053 & 0.8695 & 0.8385 & 0.8146 & 0.7916 \\ RED-Net & 0.9527 & 0.9079 & 0.8721 & 0.8411 & 0.8147 & 0.7949 \\ TWSC & 0.9547 & 0.9044 & 0.8590 & 0.8200 & 0.7881 & 0.7627 \\ CsNet & 0.9547 & 0.9109 & 0.8763 & 0.8461 & 0.8185 & 0.7958 \\ DIP & 0.9442 & 0.9002 & 0.8671 & 0.8391 & 0.8167 & 0.7977 \\ Proposed & **0.9550** & **0.9306** & **0.9029** & **0.8789** & **0.8554** & **0.8366** \\ \hline \hline \end{tabular}
\end{table} 
Table 11: Average FSIM results of different methods on BSD50 with various noise levels. \begin{table}
\begin{tabular}{c c c c c c} \hline \hline \multirow{2}{*}{**Method**} & \multicolumn{5}{c}{**Noise Level**} \\ \cline{2-7}  & \(\sigma\) = **10** & \(\sigma\) = **20** & \(\sigma\) = **30** & \(\sigma\) = **40** & \(\sigma\) = **50** & \(\sigma\) = **60** \\ \hline BM3D & 33.72 & 29.70 & 27.91 & 26.66 & 25.82 & 25.14 \\ FFDNet & 33.92 & 30.19 & 28.44 & 27.29 & 26.43 & 25.74 \\ NCSR & 33.42 & 29.58 & 27.60 & 26.27 & 25.35 & 24.59 \\ DrCNN & 34.02 & 30.21 & 28.42 & 27.22 & 26.37 & 25.63 \\ WNNM & 33.53 & 29.73 & 27.81 & 26.54 & 25.63 & 24.92 \\ RED-Net & 33.37 & 29.51 & 27.75 & 26.60 & 25.75 & 25.09 \\ TWSC & 33.48 & 29.70 & 27.74 & 26.46 & 25.52 & 24.79 \\ CsNet & 33.59 & 29.67 & 27.90 & 26.75 & 25.91 & 25.20 \\ DIP & 32.39 & 29.00 & 27.15 & 25.87 & 24.84 & 23.90 \\ Proposed & **35.52** & **31.85** & **29.75** & **28.35** & **27.25** & **26.43** \\ \hline \hline \end{tabular}
\end{table} 
Table 9: Average PSNR results of different methods on BSD50 with various noise levels. \begin{table}
\begin{tabular}{c c c c c c c} \hline \hline \multirow{2}{*}{**Method**} & \multicolumn{5}{c}{**Noise Level**} \\ \cline{2-7}  & \(\sigma\) = **10** & \(\sigma\) = **20** & \(\sigma\) = **30** & \(\sigma\) = **40** & \(\sigma\) = **50** & \(\sigma\) = **60** \\ \hline BM3D & 0.9127 & 0.8195 & 0.7485 & 0.6901 & 0.6426 & 0.6066 \\ FFDNet & 0.9277 & 0.8541 & 0.7933 & 0.7420 & 0.6991 & 0.6627 \\ NCSR & 0.9190 & 0.8281 & 0.7603 & 0.6950 & 0.6517 & 0.5154 \\ DrCNN & 0.9283 & 0.8526 & 0.7888 & 0.7353 & 0.6927 & 0.6511 \\ WNNM & 0.9223 & 0.8378 & 0.7721 & 0.7155 & 0.6732 & 0.6335 \\ RED-Net & 0.9228 & 0.8413 & 0.7644 & 0.6900 & 0.6322 & 0.5806 \\ TWSC & 0.9215 & 0.8370 & 0.7669 & 0.7089 & 0.6603 & 0.6189 \\ CsNet & 0.9604 & 0.9122 & 0.8602 & 0.8143 & 0.7663 & 0.6922 \\ DIP & 0.8997 & 0.7864 & 0.8029 & 0.7765 & 0.7363 & 0.7019 \\ Proposed & **0.9604** & **0.9287** & **0.8867** & **0.8534** & **0.8176** & **0.7861** \\ \hline \hline \end{tabular}
\end{table} 
Table 13: Average SSIM results of different methods on 10 images in Flickr1024 with various noise levels.