Yang Di, Qiao Dayong, Xia Changfeng
Opt Express. 2020 Oct 26;28(22):33240-33253. doi: 10.1364/OE.408444.
Structured light is an optical 3D surface measurement technique with the merits of high speed and high robustness. However, the huge size of traditional digital light processing (DLP) projectors limits its convenience in numerous applications. In this paper, a one-axis MEMS mirror is used as the structured light projector in 3D modeling systems, and has the advantages of small volume and low cost. Limited by the inability to project orthogonal patterns and projection distortion, it is difficult for the one-axis MEMS mirror based 3D modeling system to obtain high accuracy through existing calibration methods. This paper proposed a calibration method for structured light 3D modeling systems that can only project stripes in one direction with projection distortion. A curved surface equation called curved light surface model was proposed to replace the ideal plane equation as the mathematic model of the projected structured light stripes. Experiment results verified that this method can significantly reduce the effect of projection distortion and an accuracy of 0.11 mm was achieved when measuring a standard dumbbell-shaped object with 201.10 mm center-to-center distance.
结构光是一种光学三维表面测量技术，具有高速和高鲁棒性的优点。然而，传统数字光处理（DLP）投影仪的巨大尺寸限制了其在众多应用中的便利性。本文中，单轴微机电系统（MEMS）镜被用作三维建模系统中的结构光投影仪，具有体积小、成本低的优点。受限于无法投射正交图案和投影畸变，基于单轴MEMS镜的三维建模系统难以通过现有校准方法获得高精度。本文提出了一种针对只能在一个方向投射条纹且存在投影畸变的结构光三维建模系统的校准方法。提出了一种名为曲面光面模型的曲面方程，以取代理想平面方程作为投射结构光条纹的数学模型。实验结果验证了该方法能显著降低投影畸变的影响，在测量中心距为201.10 mm的标准哑铃形物体时，实现了0.11 mm的精度。
