Abstract
X-ray computed tomography images of three-phase silica sand and glass bead specimens are analyzed and used to evaluate the segmentation performances of Otsu-, and recursion-based multilevel algorithms. A global image segmentation technique that combines iterative and recursive algorithms, namely a refined statistics-based global segmentation is proposed for segmenting multi-phase granular geomaterials. The performance of the proposed algorithm is tested by segmenting partially saturated silica sand and glass bead specimens. For the tested silica sand specimen, the refined statistics method estimated void ratio and degree of saturation were 0.67 and 39.35%. The estimates for the glass bead specimen yielded 0.64 and 43.49%, respectively. The true void ratio (0.66) and degree of saturation (37.71%) were determined with a user-controlled Image processing software package—Image-Pro. It was found that the proposed method estimated the void ratio and the degree of saturation with 1.52 and 4.35 percent errors for the silica sand and with 15.63 and 0.34 percent errors for the glass bead, respectively. The computational time of the proposed method was found to be shorter than other methods considered. Overall, it is concluded that the proposed technique performed better in segmenting three-phase granular geomaterials.
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This work was supported by the Center for Advanced Infrastructure and Transportation (CAIT) through the national University Transportation Centers (UTC) Program (Grant No. 5232). Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of CAIT.
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Manahiloh, K.N., Abera, K.A. & Motalleb Nejad, M. A Refined Global Segmentation of X-Ray CT Images for Multi-phase Geomaterials. J Nondestruct Eval 37, 54 (2018). https://doi.org/10.1007/s10921-018-0508-y
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DOI: https://doi.org/10.1007/s10921-018-0508-y