基于点云簇组合特征的激光雷达地面分割方法

针对三维激光雷达在地面分割过程中存在分割不足和过分割的问题,提出一种基于点云簇组合特征的激光雷达地面分割方法。首先将三维点云投影到扇形栅格中进行连通域聚类,将梯度相差较小的栅格聚为一类。然后根据路面点云符合平面和直线几何特征的特点,对每一簇进行特征值计算以挑选路面栅格簇的候选簇,接着对其进行径向方向上的梯度检查以剔除误判栅格。最后使用三次B样条曲线进行平滑拟合,实现地面点与非地面点的分割。在不同路面状况的场景中对所提方法进行验证。实验结果表明,所提方法在含有多障碍物路面的准确率为97.50%,计算时间为27ms,说明所提方法的地面提取准确率更高,路面适应性更强。

Lidar Ground Segmentation Method Based on Point Cloud Cluster Combination Feature

Aiming at the problem of insufficient segmentation and over-segmentation of 3D lidar in multi-type scene,a lidar ground segmentation method based on the combined features of point cloud clusters is proposed.First,the three-dimensional point cloud is projected into a fan-shaped grid to cluster the connected domains,and the grids with small gradients are clustered into one category.Then,according to the characteristics of the pavement point cloud conforming to the geometric characteristics of the plane and the straight line,the eigenvalue of each cluster is calculated to select the candidate clusters of the pavement grid cluster,and then the gradient in the radial direction is checked to eliminate the misjudged grid.Finally,the cubic B-spline curve is used for smooth fitting to realize the division of ground points and non-ground points.The proposed method is verified in different road conditions.The experimental results show that the accuracy of the proposed method on roads with multiple obstacles is 97.50%,and the calculation time is 27 ms,indicating that the proposed method has higher ground extraction accuracy and stronger road adaptability.