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Shape Parameters or Form factors.

Shape parameters or form factors are derived from more basic measurements such as area, diameter, perimeter, area of convex hull.  The Blob Tool does not calculate the Form Factors.  You can calculate them using the Spreadsheet Tool, or write the blob statistics to a file and use Excel*.

Definitions of diameter vary -- I prefer to use the maximum caliper diameter in most instances.

From  J. Russ  Image Processing Handbook, Vol. 2, p. 525