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Sent: 26 January 2021 09:03
Subject: Longest axis/minimum containing sphere of 3D object?
Hello everyone!
I have a stack of binary images that is to be interpreted as a 3D image. I have background (in black) and one irregular-shaped object in it (the model of a soil aggregate). I now want to know the longest axis of this object.
I thought the easiest way would be to let a function find the smallest containing sphere and take the diameter. I am aware that in BoneJ, there is a function that allows to find an optimal sphere based on points that are marked by hand. This is, however, not quite what I need and I hope to find a solution without too much manual work, since actually, I have a bit more than one stack. Is anyone aware of a function that can do that?
Another way might be to use the 3D Convex Hull package that can find me the vertices of a convex hull of a 3D object. Does anyone have an idea how to find the largest pair-wise distance between them in ImageJ? Or is this something that's better done with another program?