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.

Objective

A videometrics technique was proposed in this work to measure the topography and deformation of a large cable net structure.

Methods

Tiny 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.

Results

The 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.

Conclusions

The 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.

中文翻译：

---

基于微小光斑标记的大型柔性索网动态地形视频测量

背景：

大型柔性索网结构整体尺寸较大，局部尺寸较小，传统的视频测量方法无法用于测量。

客观的

在这项工作中提出了一种视频测量技术来测量大型索网结构的地形和变形。

方法

高亮度（和大灰度梯度）的小点用于标记电缆网节点。通过合理安排成像光路，可以放大并准确识别拍摄图像中的光点标记。

结果

推导出并验证了成像参数与光斑标记灰度分布的关系。并利用所提出的视频测量技术对索网结构进行了地形测量实验。

结论

索网的形貌/变形可以用微小的光斑标记来测量，证明了该技术在大型索网结构的形貌和变形测量中的有效性和鲁棒性。