Recognition and repairing of surface hole in three dimensional laser scanning system

To solve the hole-problem of the reconstructed surface in three dimensional laser scanning system, the hole-recognition and repair method based on the Floyd shortest path selection algorithm is proposed.We process one by one all the boundary points of the three dimensional surface which might constitute a hole, and adopt the tree search algorithm to obtain the boundary points, which are directly or indirectly connected to the processed point, and use them as the routing nodes, then the boundary sides which are connected with the nodes are used as the routing sides, and we set the length of the boundary sides according to the search level of the nodes.When the newly searched boundary point overlap with the already searched points, we firstly process the distance matrix and the routing matrix to find the hole endpoint by the Floyd algorithm, and then make use of the repeated point and the hole endpoint to generate the hole boundary sides set.Finally, we deal with the hole boundary sides set using the wave front method.The experimental results show that the proposed method can accurately identify the special hole-structures, such as a hole connected with an isolated boundary side and two adjacent holes, and has better versatility and robustness compared with the traditional method.Compared with two traditional methods, the number of the repaired holes has been increased by 54.1% and 21.3%, respectively.