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Videometrics Measurement for Dynamic Topography of Large Flexible Cable Net Based on Tiny Light Spot Markers |
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| Authors: | Qin S. Ma Q. Liu G. Zhu H. Ma S. |
| Affiliation: | 1.School of Areospace Engineering, Beijing Institute of Technology, Beijing, P.R. China ;2.Equipment Testing and Diagnosis Technology Research Center, Institute of Flexible Electronics Technology of THU, Zhejiang, Jiaxing, P.R. China ;3.School of Naval Architecture, Ocean & Civil Engineering, Shanghai Jiao Tong University, Shanghai, P.R. China ; |
| Abstract: | Background: Traditional videometric method can not be used in the measurement of large flexible cable-net structure for its large overall size and small partial size. ObjectiveA videometrics technique was proposed in this work to measure the topography and deformation of a large cable net structure. MethodsTiny spots with high brightness (and large gray gradient) are used to mark the cable net nodes. By arranging the imaging light path properly, the light spot markers can be enlarged and accurately identified in the captured images. ResultsThe relationship between the imaging parameters and the gray distribution of the light spot markers were derived and verified. And a topographical measurement experiment of a cable net structure was carried out with the proposed videometrics technique. ConclusionsThe topography/deformation of the cable net can be measured with tiny-light spot markers, and the effectiveness and robustness of the technique on topography and deformation measurement of large cable-net structures are demonstrated. |
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