Select these parameters to compute diameters of objects. The diameter is defined as the length of the line segments connecting opposite boundary points and passing through the Centroid. A set of diameters is obtained from a family of such lines with angles evenly varying from 0 to 179 degrees to the horizontal. The step between consecutive angles is defined by the Angle step option in Measurements Preferences
DMax returns the length of the longest line connecting two points of the object's outline and passing through the center of gravity.
DMin returns the length of the shortest line connecting two points of the object's outline and passing through the center of gravity.
DAvrg returns the average length of diameters measured at 1-degree intervals.
DRatio returns the ratio of the maximum diameter divided by the minimum diameter.
The parameters are calculated in calibrated units.