Fig. 6

2D images illustrating the effects of spatial filtering and segmentation of volume tomogram. The same region with a size of 512 × 512 pixels is shown for clarity. The raw and filtered images are displayed in the upper row, the segmented image and the combination of raw images with inscribed phase 3D interfaces (bright white curves) are shown in the lower row (pores are black). The phase interface can be thick when it represents a plane coinciding with the image plane. The pixel/voxel size a is 2.59 µm