P. B. Albee, G. C. Stockman, and A. J. M. Smucker, "Extraction of Pores from Microtomographic Reconstructions of Intact Soil Aggregates," Preprint ANL/MCS-P790-0100, January 2000. [pdf]
Segmentation of features is often a necessary step in the analysis of volumetric data. We have developed a simple technique for extracting voids from irregular volumetric datasets. In this work we look at extracting pores from soil aggregates. First we identify a threshold that gives good separability of the object from the background. We then segment the object and perform connected components analysis on the pores within the object. Using our technique, pores that break the surface can be segmented along with pores completely contained in the initially segmented object.