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Menu:   Measure > Parameters  
Script:   SelectParam ("Rectangularity")  

Select this parameter to compute the rectangular form-factor of objects. The rectamgularity is derived from the axes of the equivalent ellipse and describes how the area of the object is close to the area of its bounding box
. The rectangularity is close to 1 for rectangular objects objects and less than 1 for objects of a different shape.

The following formula is used in calculations: