利用三维激光扫描技术进行万寿寺塔变形监测

Deformation monitoring of Wanshou temple tower based on 3D laser scanning

针对传统测量方法在古塔遗址变形监测中存在过程复杂、精度较低等问题,本文采用三维激光扫描技术进行变形监测,提出了一种基于最小二乘的塔体倾斜度计算方法。该方法首先提取出每层塔体的轮廓点云,然后根据最小二乘原理拟合出每层塔体的圆心,最后对其每层圆心进行线性拟合提取塔体中轴线,进而计算塔体倾斜量。以西安万寿寺古塔为例,较传统监测方法,本文算法能够快速计算出塔体的倾斜度,有效提升了工作效率。

Aiming at the problem that adopting traditional measurement approaches to monitor the deformation with respect to ancient tower site is with complex process and low precision, this paper use 3 D laser scanning method to perform the deformation monitoring while propose a slope calculation algorithm based on least squares principle. The method tirstly extracts the contour point cloud of each layer with respect to the tower first, then fits the center of each layer according to the principle of least squares, conducting linear fitting to extract the central axis of the tower, and finally calculates the tilt amount of the tower. Taking the deformation monitoring of Wanshou temple tower in Xi’an as an example, the experimental results show that the proposed algorithm can quickly calculate the inclination of the tower and improve the working efficiency in contrast to the traditional monitoring methods.