一种改进RANSAC算法的三维激光扫描断面直径提取方法

A 3D Laser Scanning Section Diameter Extraction Method with Improved RANSAC Algorithm

传统方法检测轨道交通结构信息周期长、作业效率低,而移动式三维激光扫描速度快但数据量大,计算效率低。本文针对地铁盾构断面的特点提出了一种改进RANSAN算法的三维激光扫描断面直径提取方法,该方法有效减少了算法的迭代次数,提高了计算效率,同时通过改进RANSAC的算法获取隧道最大断面直径与TM50全站仪获取的隧道最大断面直径进行对比分析,试验结果表明:基于改进的RANSAC算法提取隧道最大断面直径具有较高的精度和可靠性,可为地铁隧道变形监测提供有力的数据支撑。

Aiming at the problems of long information cycle and low efficiency of traditional methods for detecting rail transit structures,while the mobile 3D laser scanning speed is fast,but the data volume is large and the calculation efficiency is low,in view of the char-acteristics of metro shield section,this paper proposes a 3D laser scanning section diameter extraction method based on the improved RANSAN algorithm,which effectively reduces the number of iterations of the algorithm and increases the calculation efficiency.At the same time,the maximum section diameter of the tunnel obtained by the improved RANSAC algorithm is compared with the maximum section diameter of the tunnel obtained by the TM50 total station.The test results show that the extraction of the maximum section di-ameter of the tunnel based on the improved RANSAC algorithm has high accuracy and reliability,and can provide scientific data sup-port for deformation monitoring of subway tunnel.