Richert, ClaudiaClaudiaRichertWu, YijuanYijuanWuHablitzel, Murilo P.Murilo P.HablitzelLilleodden, EricaEricaLilleoddenHuber, NorbertNorbertHuber2021-10-212021-10-212021-07-14MRS Advances 6 (20): 519-523 (2021-07-14)http://hdl.handle.net/11420/10554Segmentation of scanning electron microscopy (SEM) images of focused ion beam (FIB) cross-sections through indented regions in nanoporous gold (np-Au) is carried out. A key challenge for image analysis of open porous materials is the appropriate binarization of the pore and gold ligament regions while excluding material lying below the cross-sectional plane. Here, a manual approach to thresholding is compared to global and local approaches. The global thresholding resulted in excessive deviations from the nominal solid fraction, due to a strong gray-scale gradient caused by the tilt angle during imaging and material shadowing. In contrast, the local thresholding approach delivered local solid fractions that were free of global gradients, and delivered a quality comparable to the manual segmentation. The extracted densification profiles vertically below the indenter as well as parallel to the surface showed an exponential-type decay from the indenter tip towards the nominal value of 1 far from the indenter. Graphic abstract: [Figure not available: see fulltext.]en2059-8521202120519523Springer Nature Switzerland AGhttps://creativecommons.org/licenses/by/4.0/TechnikJournal Article10.15480/882.383510.1557/s43580-021-00099-w10.15480/882.3835Journal Article