The nontarget-based displacement measurement approaches that use structural features have been developed for the wider adoption of computer vision-based methods in real-world applications. However, nontarget-based approaches still require the target or known structural metric information to obtain the displacement. This study proposes a nontarget-based displacement measurement method using LiDAR combined with a camera. The displacement calculation from the acquired image and point cloud information was presented based on coordinate transforms from the image to the world coordinate system. The proposed method was also designed to compensate measurement errors caused by out-of-plane motion. The proposed method was validated in two laboratory experiments and field testing using a full-scale railway bridge.

已经开发了使用结构特征的基于非目标的位移测量方法，以便在实际应用中更广泛地采用基于计算机视觉的方法。然而，非基于目标的方法仍然需要目标或已知的结构度量信息来获得位移。本研究提出了一种使用激光雷达结合相机的非目标位移测量方法。基于图像到世界坐标系的坐标变换，提出了基于获取的图像和点云信息的位移计算。所提出的方法还旨在补偿由平面外运动引起的测量误差。所提出的方法在两个实验室实验和使用全尺寸铁路桥梁的现场测试中得到验证。