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The Kuwahara filter is an edge preserving noise filter. It splits an area into 4 overlapping regions and picks the average of the region that has the smallest variance.
 
Before:
 
After applying a Kuwahara Filter of Size 5:
 
Before:
 
After applying a Kuwahara Filter of Size 5:
 
Before:
 
After applying a Kuwahara Filter of Size 5:
 
Before:
 
After applying a Kuwahara Filter of Size 5:
 
Before:
 
After applying a Kuwahara Filter of Size 5: