3D Least Squares Matching Applied to Micro-Tomography Data

Research output: Contribution to journalConference articleContributedpeer-review

Contributors

Abstract

The paper introduces 3D least squares matching as a technique to analyze multioral micro-tomography data in civil engineering material testing. Time series of tomography voxel data sets are recorded during an in-situ tension test of a strain-hardening cement-based composite probe at consecutive load steps. 3D least squares matching is a technique to track cuboids in consecutive voxel data sets minimizing the sum of the squares of voxel value differences after a 12-parameter 3D affine transformation. For a regular grid of locations in each voxel data set of the deformed states, a subvoxel-precise 3D displacement vector field is computed. Discontinuities in these displacement vector fields indicate the occurrence of cracks in the probes during the load tests. These cracks are detected and quantitatively described by the computation of principal strains of tetrahedrons in a tetrahedral mesh, that is generated between the matching points. The subvoxel-accuracy potential of the technique allows the detection of very small cracks with a width much smaller than the actual voxel size.

Details

Original languageEnglish
Pages (from-to)533-539
Number of pages7
JournalInternational Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences
Volume43
Issue numberB2-2021
Publication statusPublished - 28 Jun 2021
Peer-reviewedYes

External IDs

Scopus 85116063808

Keywords

Keywords

  • 3D Least Squares Matching, Computed Tomo-graphy, Cuboid Tracking, In-situ Test, Material Testing, Displacement Vector Field, Computed Tomography, Displacement Vector Field