基于共面约束的高铁表面点云数据匹配方法

Point cloud registration for high-speed railway surfaces using coplanarity constraints

  • 摘要: 点云配准广泛应用于机器人检测和场景重建中不同测量位姿数据的融合。然而,针对高铁车体等大尺度场景中常见的平面特征,传统基于点对点距离和点到平面距离的配准方法在初始姿态不佳时易陷入局部极小值。为解决这些问题,提出了一种基于共面约束的鲁棒多维点云配准方法。首先,对二维平面特征中的点云进行投影,并定义二维点对点(point-to-point in two-dimension, PTP-2D)距离以约束不同平面特征之间的距离。该约束能够有效规避局部极小值,但会引发平移向量解的非唯一性。因此,引入三维点到点(point-to-point in three-dimension, PTP-3D)约束以限定平移向量解集,并进一步定义多维点到点距离(point-to-point in multi-dimension, PTP-MD)平衡收敛速度与配准精度。为验证PTP-MD方法的有效性,将其与四种经典配准方法在高速列车车身点云上进行了对比。试验结果表明,相比于传统的点云匹配方法,该方法能够显著摆脱局部极小值。

     

    Abstract: Point cloud registration is extensively utilized in robotic inspection and scene reconstruction to integrate data from various measurement poses. However, for large-scale scenes such as high-speed train bodies and buildings, which exhibit prominent planar features, traditional registration methods based on point-to-point and point-to-plane distances are susceptible to converging at local minima when the initial pose estimation is inaccurate. Moreover, these methods tend to slide along the tangent spaces of planar features, leading to suboptimal alignment. To address these challenges, this paper proposes a robust multi-dimensional point cloud registration method. Initially, the point cloud is projected onto planar features to define a point-to-point in two-dimensional (PTP-2D) distance, which effectively constrains the distances between different planar features and mitigates the risk of falling into local minima. However, this constraint introduces non-uniqueness in the translation vector solution. Consequently, a point-to-point in three-dimensional (PTP-3D) constraint is incorporated to further refine the solution set of translation vectors, resulting in the definition of a point-to-point in multi-dimensional (PTP-MD) distance. The effectiveness and efficiency of the proposed PTP-MD method are validated through comparisons with four classical registration methods on high-speed train body inspection. Simulation results indicate that the proposed method significantly alleviates the local minima problem and effectively prevents sliding along tangent planes.

     

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