C1 - 3D measuring methods
Model-based photogrammetric 3D monitoring of dynamic processes
Hans-Gerd Maas (Institute of Photogrammetry and Remote Sensing) in cooperation with Viktor Mechtcherine (Institute of Construction Materials)
2D crack pattern from photogrammetric image sequence analysis
Visualization of crack widths (color code and heights of prisms)
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.
Stereo high speed camera system
Publications:
Liebold, Frank; Maas, Hans-Gerd: Advanced spatio-temporal filtering techniques for photogrammetric image sequence analysis in civil engineering material testing. In: ISPRS Journal of Photogrammetry and Remote Sensing, Volume 111, January 2016, Pages 13-21, ISSN 0924-2716, http://dx.doi.org/10.1016/j.isprsjprs.2015.10.013 (2016)
Liebold, Frank; Maas, Hans-Gerd: 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 (2018), Nr. 2, S. 193–200