孙茜, 薛庆生, 张冬雪, 白皓轩. 水下目标物三维激光重建方法研究[J]. 红外与激光工程, 2022, 51(8): 20210693. DOI: 10.3788/IRLA20210693
引用本文: 孙茜, 薛庆生, 张冬雪, 白皓轩. 水下目标物三维激光重建方法研究[J]. 红外与激光工程, 2022, 51(8): 20210693. DOI: 10.3788/IRLA20210693
Sun Qian, Xue Qingsheng, Zhang Dongxue, Bai Haoxuan. Research on the 3D laser reconstruction method of underwater targets[J]. Infrared and Laser Engineering, 2022, 51(8): 20210693. DOI: 10.3788/IRLA20210693
Citation: Sun Qian, Xue Qingsheng, Zhang Dongxue, Bai Haoxuan. Research on the 3D laser reconstruction method of underwater targets[J]. Infrared and Laser Engineering, 2022, 51(8): 20210693. DOI: 10.3788/IRLA20210693

水下目标物三维激光重建方法研究

Research on the 3D laser reconstruction method of underwater targets

  • 摘要: 文中提出了一种水下线激光的三维重建系统,由相机、绿色线形激光器和转台组成,通过对系统扫描获得的图像进行分析与处理,实现对目标区域的三维重建。采用边缘检测算法与基于极值法的高斯拟合法相结合的条纹中心提取算法,利用坐标转换公式,得到相应的三维点云坐标。点云处理方面,将alpha shapes边界提取算法和Delaunay三角剖分相结合,实现对点云的滤波与重建。针对实验中由于光线在不同介质表面折射造成的视角误差问题,提出了一种折射校正算法,并用已知尺寸的标准球进行了误差实验。结果表明,在500~1200 mm的工作距离内,系统可以实现对水下目标物体及区域的三维形貌还原,重建误差小于0.6 mm,满足设计要求,为水下三维重建技术提供新的参考。

     

    Abstract: A three-dimensional reconstruction system for underwater lasers is proposed, which is composed of a camera, green linear laser and turntable. The three-dimensional reconstruction of the target area is realized by analyzing and processing the image scanned by the system. In the aspect of point cloud processing, this paper combines the alpha shape boundary extraction algorithm and Delaunay triangulation to realize the filtering and reconstruction of point clouds. Aiming at the problem of viewing angle error caused by light refraction on different media surfaces in the experiment, a refraction correction algorithm is proposed, and the error experiment is carried out with a standard ball of known size. The results show that at a working distance of 500-1200 mm, the system can restore the three-dimensional morphology of underwater target objects and regions, and the reconstruction error is less than 0.6 mm, which meets the design requirements and provides a new reference for underwater three-dimensional reconstruction technology.

     

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