Development of express assessment system of road surface with stereo image processing and GPS

本研究开发了用于路面评估的立体摄像系统。在本研究中，首先利用标定立体相机系统拍摄的静态照片重建路面目标的三维坐标。随后，通过提供适当的初始条件和图像相关方法，提出了一种改进的迭代封闭点方法，对不同视图网格得到的各种坐标进行对齐。已经进行了几次实地测试，以评估该系统的能力。在对所有测量坐标进行对齐后，该系统不仅可以提供准确的局部缺陷信息，如补丁、裂缝或坑洼，还可以提供路面长距离范围内的全局波动信息。

This research developed a stereo camera system for road surface assessment. In this study, first the static photos taken by a calibrated stereo camera system are utilized to reconstruct the three-dimensional coordinates of targets in the pavement. Subsequently to align the various coordinates obtained from different view meshes, one modified Iterative Closet Point method is proposed by affording the appropriate initial conditions and image correlation method. Several field tests have been carried out to evaluate the capabilities of this system. After succeeding to align all the measured coordinates, this system can offer not only the accurate information of local deficiency such as the patching, crack or pothole, but also global fluctuation in a long distance range of the road surface.