On the use of ArUco markers in long term monitoring of timber structures

0575794 - ÚTAM 2024 RIV US eng C - Conference Paper (international conference)
Kunecký, Jiří
On the use of ArUco markers in long term monitoring of timber structures.
WCTE 2023. Proceedings from the 13th World conference on timber engineering. Red Hook (NY): Curran Associates, 2023 - (Nyrud, A.; Malo, K.; Nore, K.), s. 558-563. ISBN 9781713873273.
[World conference on timber engineering. WCTE /13./. Oslo (NO), 19.06.2023-22.06.2023]
R&D Projects: GA ČR(CZ) GA21-29389S
Institutional support: RVO:68378297
Keywords : monitoring of timber structures * ArUco markers * measurement of displacement * long term monitoring
OECD category: Construction engineering, Municipal and structural engineering
https://doi.org/10.52202/069179-0076

For research and monitoring purposes, there is a need to measure long-term displacements of parts, joints, etc. Of course, existing solutions (LVDT, Tell tales, etc.) can be used, but they are relatively expensive or inaccurate. The article describes a simple procedure based on an optical method using ArUco markers originating from computer vision applications (robotics). This technique uses not only marker tracking, but also along with it image rectification using
projective transformation, and thus works well in 2D structures (beams, walls). The illustrated principle allows to take only two images (the original and another one after a certain time) and to quantify the displacement and rotation of the
markers identified in the images. Reference points have to be specified. The displacement fields are then interpolated and a final map is produced. This can be of interest to anyone working in practice, conducting research on the long-term
behavior of joints, monitoring the creep of wooden structures or for any monitoring purpose - including laboratory tasks.
The article describes accuracy and error estimation and shows an example of use.
Permanent Link: https://hdl.handle.net/11104/0345514