架空输电走廊地表三维重建网格中杆塔的剔除

由于立体匹配和模型自动重建的不确定性和不完整性,基于无人机多视影像重建输电走廊三维表面模型时,很难精确完整地构建出架空输电区域内的杆塔模型。自动重建的杆塔不仅无法加以利用,而且还会与人工重建的矢量杆塔叠加显示,影响可视化效果。为此,提出一种基于矢量杆塔模型的自动重建杆塔剔除方法。首先,根据矢量杆塔类型构建裁切空间包围盒;其次,根据矢量杆塔的空间位置和裁切空间包围盒,定位出残缺塔身在重建模型中的空间范围;最后,基于射线碰撞检测算法,设计一种附有自适应距离约束的残缺杆塔三角面检测方法来自动剔除残缺塔。该算法能够自适应处理杆塔底座细节,剔除不需要的三角面,同时保留塔脚基座和其他地面信息。实验结果表明本文方法的正确性和实用性。

Elimination of Pylons from Reconstructed 3D Ground Mesh of Power Transmission Corridors

 Due to the uncertainty and incompleteness of stereo matching and automatic reconstruction, it is impossible to reconstruct the power pylons mesh completely and perfectly from Unmanned Aerial Vehicle (UAV) images. The automatic reconstructed pylon mesh is not only difficult to be utilized, but also could affect the visualization effect of manually extracted power pylon models. Thus, this paper proposes an approach to eliminate these needless pylon meshes automatically based on vector pylon model. Firstly, the spatial bounding boxes of a pylon are constructed according to vector pylon type. Secondly, according to the vector pylon position and its spatial bounding boxes, the range of the needless pylon is located in the reconstructed mesh tile. Finally, based on the ray collision checking method, an algorithm of Incomplete Pylon Detection with Adaptive Distance Constraint (IPD-ADC) is designed to automatically eliminate the damaged towers. The proposed method can adaptively process the details of the tower base and eliminate unnecessary triangular surface while retaining the tower base and other ground information. The experiments show the correctness and practicality of the proposed method.