Use other approaches to remove outliers

[jfoclpf]

Another approach: pie

1. Draw a convex hull polygon around the points
2. Find the centroid of the polygon
3. Split this polygon in N pie slices around the centroid, each portion having an angle of 2*Pi/N
4. Strip outliers in each pie slice, based on the distance of each point to the centroid minus the median of the points in each pie slice

Another approach: chaikin

1. Draw a concave hull polygon around the points
2. Smooth the polygon with Chaikin's algorithm
3. Strip out the points which are not included in the smoothed polygon.
4. Repeat points 1 till 4 N times.
   
   In this picture the smoothed polygon does not include the previous point