I have a segmented CT image of a pore geometry. I can compute the skeleton on the geometry no problem and get an estimated hydraulic radius at each location along the skeleton by interpolating the Euclidean distance transform. This method gives the distance between the pore centerline and the closest pore edge, essentially a measure of the radius of the inscribed sphere within a pore geometry. This is adequate for semi-cylindrical pores, but for irregular pores, the effective hydraulic radius is larger.
Is there a modified distance map transform that gives a better estimate of the effective hydraulic radius of a pore from a CT image?
If you have a segmentation of the pores you can use connected component labeling (http://www.mathworks.com/help/images/ref/bwconncomp.html) and regioprops (http://www.mathworks.com/help/images/ref/regionprops.html) and than for each pore you can find the 'Orientation' property of the pore which is the best ellipse that is fitted to the connected component.
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