现有的结构光视觉测量系统中,相机和结构光投射器安装在玻璃管内部以实现全景测量,但玻璃管会导致光发生折射而带来畸变。针对上述畸变,分析了光线在两个圆柱形表面折射的过程,研究了两个异面的折射平面所带来的畸变,建立了一种全景结构光视觉测量通用畸变校正模型。采用全景结构光视觉测量系统对内径为288.50 mm的铝管进行测量,基于全景结构光视觉测量通用畸变校正模型计算铝管的内径。实验结果表明,系统的重复性精度为0.047 mm,测量精度为0.23 mm,系统具有较好的稳定性和可靠性,所提出的全景结构光视觉测量通用畸变校正模型具有较高的准确性。

In the existing structured-light vision measurement systems, the camera and the projector are installed inside a glass tube to cover the omnidirectional field of view, inevitably causing the refraction distortion. To address the distortion mentioned above, the refraction on two cylindrical interfaces is analyzed and the distortion caused by two non-coplanar refraction planes is investigated. A general distortion correction model of omnidirectional structured-light vision measurement is established. An aluminum tube with an internal diameter of 288.50 mm is measured by the omnidirectional structured-light vision measurement system and the internal diameter of this aluminum tube is calculated based on the proposed general distortion correction model. The experimental results indicate that the repeatability and precision reach 0.047 mm and 0.23 mm, respectively. The measurement system is stable and reliable, and the proposed general distortion correction model of omnidirectional structured-light vision measurement is highly accurate.