基于三维激光扫描技术的路面断板深度检测

Detection method for the depth of pavement broken block in cement concrete based on 3D laser scanning technology

针对传统的路面检测方法无法直接获得路面的深度信息,设计了一种基于三维激光扫描技术的路面断板深度检测方法。该方法首先通过三维激光扫描仪得到路面点云数据,其次将路面断板数据沿水平方向分为若干切片,然后对每一断板切片上下平面分别进行拟合,最终根据上下平面之间的距离确定断板的深度。根据实际工程需要,提出了一种基于动态阈值的平面拟合迭代算法,不仅可以有效地识别并去除断板点云数据中的无效点,而且可以在点云数据三个方向都存在误差的情况下实现平面计算。实验结果表明,该方法不仅能得到整个路面断板的深度信息,还能反映出断板深度沿水平方向的变化趋势。

Because the depth information of pavement could not be got directly by traditional method of pavement detection, a detection method for the depth of broken block in pavement based on 3D laser scanning technology was presented. The point cloud data of the broken crack can be obtained by a 3D laser scanner. The crack data can be divided into several slices along the horizontal direction, and the depth information for each of the slices can be estimated by the distance between the up and down planes respectively. According to the practical engineering, a novel plane fitting iterative algorithm based on dynamic threshold was proposed, it can not only identify and remove invalid points in the point cloud data effectively, but also accomplish plane calculation with errors in three directions. Experiments show that the proposed method can not only get the depth information of the whole pavement broken block, but also reflect the change trend of the depth of the broken block along the horizontal direction.