C1 3D measurement techniques of fracture processes

Doctoral Researcher
Frank Liebold

Principal Investigator
Hans-Gerd Maas

in cooperation with 
Viktor Mechtcherine

Project poster
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2D crack pattern from photogrammetric image sequence analysis
© Institute of Photogrammetry and Remote Sensing

2D crack pattern from photogrammetric image sequence analysis

In order to further develop photogrammetric techniques for 3D monitoring of dynamic processes, the target variables (e.g. deformations, crack widths) shall be introduced as unknown directly into the parameter estimation process, thus combining the geometrical model of photogrammetry with deformation models from mechanics. From a stochastic point of view, this has the advantage of higher redundancy and the implicit use of covariance in the measurement process, leading to an increase in accuracy and reliability. This is particularly relevant when photogrammetric measuring techniques are employed close to the limit of their applicability, as often the case in the evaluation of high-speed camera image sequences of highly dynamic processes. The model-based approach aims to compensate for this impairment and to make stereo high-speed camera systems a universally applicable tool in the analysis of high-dynamic processes.

Peer Reviewed Journal Publications

  • Elias M., Eltner, A., Liebold, F., Maas, H.-G.: Assessing the influence of temperature changes on the geometric stability of smartphone- and Raspberry Pi cameras. In Sensors, 20(3) (2020), 643.
  • Liebold, F., Maas, H.-G.: Strategy for Crack Width Measurement of Multiple Crack Patterns in Civil Engineering Material Testing Using a Monocular Image Sequence Analysis. In PFG (2020) – in press
  • Riedel, M., Deutsch, J., Liebold, F., Ihlenfeld, S.: Beleuchtungsabhängige Effekte bei der Bildmessung von kreisförmigen Zielmarken. In AVN 127(2) (2020), 51-60.
  • Liebold, F., Maas, H.-G., Deutsch, J.: Photogrammetric determination of 3D crack opening vectors from 3D displacement fields. In ISPRS Journal of Photogrammetry and Remote Sensing, 164 (2020), 1-10
  • Liebold, F., Maas, H.-G. Sub-pixel Accuracy Crack Width Determination on Concrete Beams in Load Tests by Triangle Mesh Geometry Analysis. In ISPRS Ann. Photogramm. Remote Sens., Spatial inf. Sci., IV-2 (2018),193-200, Riva, Italy.

Other Publications

  • Riedel, M., Deutsch, J., Liebold, F., Ihlenfeld, S.: 2019. Untersuchung beleuchtungsabhängiger Effekte bei der Bildmessung. In Photogrammetrie – Laserscanning – Optische 3D-Messtechnik (Beiträge Oldenburger 3D-Tage (2019). Hrsg. Luhmann/Schuhmacher), Verlag Herbert Wichmann (2019),120-132, Oldenburg, Germany.
  • Liebold, F., Maas, H.-G., Heravi, A.A.: Crack Width Measurement for Non-planar Surfaces by Triangle Mesh Analysis in Civil Engineering Material Testing. In Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XLII-2/W18 (2019), 107-113, Strasbourg, France.