2017 Volume 126 Issue 6 Pages Cover06_01-Cover06_02
Example of Three-dimensional Image Analysis of a Liquefied Boring Core
A: Photograph of the surface of a half-cut core from a site where the 2011 off the Pacific coast of Tohoku Earthquake occurred (cut after CT scanning). The complex bends of the sand dyke are difficult to see. The scale in the longitudinal direction is 23 cm.
B: Soft X-ray image of a slab sample (thickness, 10 mm) taken from the half-cut core. The thick slab obscures the outline of the sand dyke.
C: Two-dimensional CT image (thickness, 0.3 mm) depicting the clear structure of the sand dyke.
D: Segmentation output by the GrowCut algorithm applied to C to extract only the sand dyke body. Details of the GrowCut are described in an article of this issue.
E: 209 two-dimensional segmented images are stacked to show the three-dimensional dyke structure with complex bends and branching.
A-C, and E are modifications of images of the article (Nakashima and Komatsubara, 2016).