Re: particle analysis-Feret diameter

Regarding the banana, for a few years, I've been doing analyses on cells that 
change their morphology dramatically, sometimes being shaped very much like 
banana and others like an egg, as well as some other very different shapes.  I 
need info on the smallest and largest "diameters", the degree of variability, 
roundness, etc., and have found the convex hull and the various radii defining 
it to be a useful way of distinguishing amongst the shapes and relating them to 
their biological correlates.  I've been using FracLac for this, which also 
gives fractal, multifractal, and lacunarity values that are useful in defining 
the cell shapes.  As to the banana, I looked at breakfast and measured the 
roundness and radii of the convex hull, lacunarity, and density within the 
convex hull.  The banana had a fractal dimension of 1, though-boring, eh?

Audrey