Determines how segments are fitted to a region.

Values of this enumeration:

• LSE - The segment is computed with Least Squares Error point fitting method.
• ConvexAxis - The segment is computed based on the major elliptic axis of the convex hull of the region.
• Tukey - The segment is computed with LSE point fitting method with Tukey's Biweight function as estimator.
• Siegel - The segment is computed with Siegel point fitting methods.