Advanced spatio-temporal filtering techniques for photogrammetric image sequence analysis in civil engineering material testing

Liebold, Frank; Maas, Hans‐Gerd

doi:10.1016/j.isprsjprs.2015.10.013

Cited by 22 publications

(22 citation statements)

References 17 publications

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“…The approach presented in this paper continues the work described in (Liebold and Maas, 2016) and (Koschitzki et al, 2011). A short overview of this approach is given in the following chapter.…”

Section: Introductionmentioning

confidence: 87%

“…Because of the typical accuracy of the matching algorithm (in extrem cases 0.10 px and even better, see (Grün, 2012)), some noise occurs in the principal strain values. To get rid of these noise effects, a bilateral filter can be applied (Liebold and Maas, 2016). The extended triangles with principal strains larger than a threshold can be merged to a region and labeled, see Figure 4.…”

Section: Image Analysis For Deformation Measurementmentioning

confidence: 99%

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Sub-Pixel Accuracy Crack Width Determination on Concrete Beams in Load Tests by Triangle Mesh Geometry Analysis

Liebold

Maas

2018

ISPRS Ann. Photogramm. Remote Sens. Spatial Inf. Sci.

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ABSTRACT:This paper deals with the determination of crack widths of concrete beams during load tests from monocular image sequences. The procedure starts in a reference image of the probe with suitable surface texture under zero load, where a large number of points is defined by an interest operator. Then a triangulated irregular network is established to connect the points. Image sequences are recorded during load tests with the load increasing continuously or stepwise, or at intermittently changing load. The vertices of the triangles are tracked through the consecutive images of the sequence with sub-pixel accuracy by least squares matching. All triangles are then analyzed for changes by principal strain calculation. For each triangle showing significant strain, a crack width is computed by a thorough geometric analysis of the relative movement of the vertices.

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Section: Introductionmentioning

confidence: 87%

Section: Image Analysis For Deformation Measurementmentioning

confidence: 99%

Sub-Pixel Accuracy Crack Width Determination on Concrete Beams in Load Tests by Triangle Mesh Geometry Analysis

Liebold

Maas

2018

ISPRS Ann. Photogramm. Remote Sens. Spatial Inf. Sci.

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“…Furthermore, the specific behavior of the investigated brittle-matrix composites necessitates dedicated strain evaluation approaches, which facilitate an accurate quantification of the cracking and fracture processes. These aspects are addressed in the project C1, in which algorithms are developed for an automatic strain and crack pattern quantification under various loading speeds and on surfaces with different geometric properties [27,28]. These developments do not only directly support the experimental projects, but are also used for verification and validation purposes in the numerical simulations.…”

Section: Interdisciplinary Projectsmentioning

confidence: 99%

Mineral-bonded composites for enhanced structural impact safety - Overview of the format, goals and achievements of the research group GRK 2250

Curosu¹

2019

Proceedings of the 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures

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Existing concrete and reinforced concrete structures feature, as a rule, a relatively low resistance against various types of dynamic loading, such as earthquake, impact or blast. This makes it important to develop effective and feasible solutions for the enhancement of the structural impact resistance, for example, by applying thin layers of strengthening material. In the frame of the Research Training Group GRK 2250 "Mineral-bonded composites for enhanced structural impact safety", established in 2017 by the German Research Foundation (DFG) at the TU Dresden, design concepts for such strengthening layers are developed and investigated experimentally and numerically. The contribution provides an overview about the goals, structure and multidisciplinary research done by the Research Training Group and presents some representative results on the impact resistance of ductile composites with continuous textile and/or short fiber reinforcement.

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“…For each epoch, all 3D points that could be matched successfully in the current time step are triangulated into a mesh using Delaunay triangulation as it is done in (Koschitzki et al, 2011), (Liebold, Maas, 2016) and (Liebold, Maas, 2018), see Fig. 4.…”

Section: Preparation and Acquisition Of The Datamentioning

confidence: 99%

Crack Width Measurement for Non-Planar Surfaces by Triangle Mesh Analysis in Civil Engineering Material Testing

Liebold¹,

Maas²,

Heravi³

2019

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

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Abstract. This publication concentrates on the photogrammetric crack width measurement of crack patterns of concrete probes under impact loading in high-speed stereo image sequences. The presented algorithm works for non-planar specimens with deformations that only appear tangential to the surface and the method is based on triangle mesh analysis. Experiments were conducted with cylindrical specimens with an impact load affecting parallel to the main axis of the cylinder.

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Advanced spatio-temporal filtering techniques for photogrammetric image sequence analysis in civil engineering material testing

Cited by 22 publications

References 17 publications

Sub-Pixel Accuracy Crack Width Determination on Concrete Beams in Load Tests by Triangle Mesh Geometry Analysis

Sub-Pixel Accuracy Crack Width Determination on Concrete Beams in Load Tests by Triangle Mesh Geometry Analysis

Mineral-bonded composites for enhanced structural impact safety - Overview of the format, goals and achievements of the research group GRK 2250

Crack Width Measurement for Non-Planar Surfaces by Triangle Mesh Analysis in Civil Engineering Material Testing

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