Figure 5. Large Beads Porosity and Number of Clusters vs.threshold value
Figure 6 shows the analysis of the glass-bead sample at threshold 0.45. Figure 6A presents the applied pore cluster analysis to this sample, resulting in a singular pore system, with all the pores being connected. The histogram in Figure 6B shows that there likely is one main pore system and, with the mode consisting of one voxel probably generated by imaging noise and processing artifacts. The singular pore system surrounds the glass beads. These results indicate that the PCA protocol developed for our studies faithfully reflects the physical reality of the system under consideration.