NMSE value comparison. The blue line shows the NMSE values obtained by the conventional bilateral filter and the red line shows the NMSE values obtained by the proposed bilateral filter. Both filters have big NMSE values when σ r is small. The proposed filter has smaller NMSE values than the conventional bilateral filter after σr reaches the optimal point.
Tang et al. BMC Genomics 2010 11(Suppl 2):S9 doi:10.1186/1471-2164-11-S2-S9