Experimental study of the influence of refraction on underwater three-dimensional reconstruction using the SVP camera model
Experimental study of the influence of refraction on underwater three-dimensional reconstruction using the SVP camera model
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DOI：
10.1364/ao.51.007591
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发表时间：
2012-11-01
期刊：
影响因子：
1.9
通讯作者：
Yang, Yee-Hong
中科院分区：
文献类型：
--
作者：
Kang, Lai;Wu, Lingda;Yang, Yee-Hong
在水下成像系统中，透视相机通常放置在水箱外部或具有平面玻璃窗的防水外壳中。当光线穿过水玻璃和空气玻璃界面时，发生光的折射，使得基于单视点（SVP）相机模型的传统多视图几何无效。虽然最近的水下视觉研究主要集中在具有挑战性的主题校准这样的系统，没有以前的工作有系统地研究了折射对水下三维（3D）重建的影响。本文通过对折射畸变的理论分析和仿真，论证了SVP相机模型用于水下三维重建的可能性。定量评价了SVP摄像机模型在水下多视三维重建中的性能。实验结果揭示了一个相当令人惊讶的和有用的，但被忽视的事实，SVP相机模型与径向畸变校正和焦距调节可以补偿折射，并实现高精度的多视图水下三维重建（在0.7毫米内的对象的尺寸为200毫米）相比，陆基系统的结果。这样的观察证明了在水下应用中使用SVP相机模型来重建可靠的3D场景是合理的。我们的研究结果可以用来指导系统参数的选择在水下三维成像装置的设计。(C)2012美国光学学会
In an underwater imaging system, a perspective camera is often placed outside a tank or in waterproof housing with a flat glass window. The refraction of light occurs when a light ray passes through the water-glass and air-glass interface, rendering the conventional multiple view geometry based on the single viewpoint (SVP) camera model invalid. While most recent underwater vision studies mainly focus on the challenging topic of calibrating such systems, no previous work has systematically studied the influence of refraction on underwater three-dimensional (3D) reconstruction. This paper demonstrates the possibility of using the SVP camera model in underwater 3D reconstruction through theoretical analysis of refractive distortion and simulations. Then, the performance of the SVP camera model in multiview underwater 3D reconstruction is quantitatively evaluated. The experimental results reveal a rather surprising and useful yet overlooked fact that the SVP camera model with radial distortion correction and focal length adjustment can compensate for refraction and achieve high accuracy in multiview underwater 3D reconstruction (within 0.7 mm for an object of dimension 200 mm) compared with the results of land-based systems. Such an observation justifies the use of the SVP camera model in underwater application for reconstructing reliable 3D scenes. Our results can be used to guide the selection of system parameters in the design of an underwater 3D imaging setup. (C) 2012 Optical Society of America