Particle Convexity

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Particle Convexity

Olga Fishkis
Hello,
I would like to measure convexity of particles ( Convex Hull Perimeter divided by particle perimeter).
Although the value of convexity has to vary between 0 and 1  (convex hull perimeter is no longer than the particle perimeter), the convexity values for some of my particles calculated by "Calculate convexity and solidarity" are higher than one. Does anybody have an idea how to overcome this problem?
Thanks a lot.
Olga