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I am developing an image analysis app and I need to calculate the aspect ratio of a segmented particle.
According to
http://www.sympatec.com/Science/Characterisation/05_ParticleShape.html
the AR is given by (FIG 1) Xfmin/Xfmax.
Any suggestion of an algorithm to get this values (Xf)?
You seem to want the width and diameter of a concave polygon. Maybe you can use the rotating caliper algorithm for that, maybe after splitting your concave polygon in a number of convex polygons.