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Table 1 The number of regions and edges in smoothing method

From: Preservation of image edge feature based on snowfall model smoothing filter

Gaussian filter Snowfall model
σ Edge retention Region Amount Edge retention Region
0.0 4799 3780 0 4799 3780
0.5 4309 3755 20 3031 3833
1.0 3034 3653 40 2290 3864
1.5 2107 3210 60 1721 3733
2.0 1570 2848 80 1400 3515
2.4 1220 2501 90 1222 3382