Fig. 3: Pore structure of the SBE.

a Segmented polymer model. b Segmented pore model. c Distance map of the pores (grayscale) in the polymer model (blue). d The distributions of equivalent diameter, and e volume of the polymers and pores. f In the watershed algorithm, the brightness of a grayscale image is treated as height information. The grayscale image is transferred to a 3D terrain, where the red lines are ridges, and the blue regions are catchment basins.