Automated investigation of concrete defects has attracted attention with well-developed computer vision techniques. However, most studies in defect reconstruction mainly focus on identifying and measuring defects on a two-dimensional surface. Few progresses have been made to explore the 3D reconstruction of concrete defects. This study describes an affordable optical laser triangulation system fusing a linear laser ray generator and a sports camera to reconstruct the concrete defects. The proposed system adopts a modified spacetime analysis approach to solve two critical imaging errors in typical laser triangulation approaches. By comparing the outputs of the proposed system and two typical laser triangulation approaches, the results show that the proposed system can eliminate the imaging errors and generate 3D reconstruction models of concrete defects with acceptable accuracy.

借助成熟的计算机视觉技术，对混凝土缺陷的自动调查引起了人们的关注。然而，大多数缺陷重建研究主要集中在识别和测量二维表面上的缺陷。在探索混凝土缺陷的 3D 重建方面几乎没有取得进展。本研究描述了一种经济实惠的光学激光三角测量系统，该系统融合了线性激光射线发生器和运动摄像机来重建具体缺陷。所提出的系统采用改进的时空分析方法来解决典型激光三角测量方法中的两个关键成像误差。通过比较所提出系统的输出和两种典型的激光三角测量方法，