Form factor of a region.

Describes the form of a region on the basis of its circularity. A perfect circle is given the value 1. The more elongated the region is, the smaller the form factor. The calculation is based on the Area filled and Perimeter Crofton parameters.

• Formula: 4 × π × Area / PerimeterCrofton²
• Unit: none
• Value range: 0...1