STRICT GEOMETRIC CALIBRATION OF AN UNDERWATER LASER TRIANGULATION SYSTEM
STRICT GEOMETRIC CALIBRATION OF AN UNDERWATER LASER TRIANGULATION SYSTEM
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DOI：
10.5194/isprs-archives-xliii-b2-2021-689-2021
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发表时间：
2021
期刊：
影响因子：
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通讯作者：
H. Sardemann;C. Mulsow;H. Maas
中科院分区：
文献类型：
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作者：
H. Sardemann;C. Mulsow;H. Maas
本文将描述一种新的水下激光三角测量系统的标定方法。由线激光器和照相机组成的水下三角测量系统可用于确定水下物体的几何形状或水体底部的地形。将相机和激光投影仪放置在防水外壳内，会在空气-玻璃-水界面产生折射效应，包括激光光片和成像光线。这意味着水中有一个变形的激光平面，物体表面上有一条曲线。该方法对摄像机、激光器和外壳之间的几何形状进行了严格的建模。初步实验表明，该标定方法可应用于水深测量，水深测量精度可达0.2~0.3 mm，达到100 mm量级。
This paper will describe a novel approach for the calibration of an underwater laser triangulation system. Underwater triangulation systems, consisting of a line laser and a camera can be used to determine the geometry of submerged objects or the topography of a water body bottom. Placing camera and laser line projector inside a waterproof housing leads to refraction effects at the air-glass-water interfaces, both of the laser light-sheet and image rays. This implies a deformed laser plane in the water and a curved line on the object surface. The proposed approach strictly models the geometry between camera, laser and housing. First experiments show, that the calibration method can be applied for water depth measurements with accuracies of 0.2 – 0.3 mm at depths in the order of 100 mm.