3D optical flow for large CT data of materials microstructures. (22nd February 2022)

• Record Type: Journal Article
• Authors: Nogatz, Tessa; Redenbach, Claudia; Schladitz, Katja
• Is Part Of: Strain. Volume 58:Number 3(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-02-22
• Subjects: digital volume correlation -- full field displacement -- in situ testing -- motion estimation -- optical flow; Strains and stresses -- Measurement -- Periodicals; 624.176
• DOI: 10.1111/str.12412
• Languages: English
• ISSNs: 0039-2103

Abstract

Abstract: We compute three‐dimensional displacement vector fields to estimate the deformation of microstructural data sets in mechanical tests. For this, we extend the well‐known optical flow by Brox et al. to three dimensions, with special focus on the discretization of nonlinear terms. We evaluate our method first by synthetically deforming foams and comparing against this ground truth and second with data sets of samples that underwent real mechanical tests. Our results are compared to those from state‐of‐the‐art algorithms in materials science and medical image registration. By a thorough evaluation, we show that our proposed method is able to resolve the displacement best among all chosen comparison methods.