Re: 3D caliper

Posted by Michael Doube on
URL: http://imagej.273.s1.nabble.com/3D-caliper-tp3689657p3689659.html

For local diameter, Local Thickness is great.  Bob, I salute you.

What about the minimum oriented bounding box, or the 3D Feret diameter?

It's trivial to get a bounding box in the x, y and z axes, and you can also work out some rotated coordinate system (e.g. from moments of inertia or best-fit ellipsoid) that describes oriented axes and work out the maximum distance from the centroid in each of the rotated axes.

How might one find a bounding box that has the least volume, or shortest sum of edge lengths, or a non-brute-force Feret?

Mike

________________________________________
From: ImageJ Interest Group [[hidden email]] On Behalf Of Robert Dougherty
Subject: Re: 3D caliper

Glen,

You might look at the local thickness plugins on my site.

Bob

On Jan 15, 2010, at 10:57 AM, Glen MacDonald wrote:

> Hello,
> Is there a plugin or other method for 3D caliper diameter?  I have someone needing to get the diameter of Purkinje dendrites and of glia processes.  I'd like to get lateral and axial  diameters, or maximum lateral diameter.