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Fig. 4


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(a) Filtered high-resolution micro-CT image of Sample 2, Site B, at voxel resolution of 2.15 μm. The filter used is a non-local means filter with a search window of 21 and a pixel neighborhood of 5. (b) Binary version of (a) obtained using a combination of gradient marker-based watershed and top-hat segmentations. The pores are shown in black.

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