用旋转柱面投影仪实现360度高精度三维扫描
Cylindrical Mechanical Projector for Omnidirectional Fringe Projection Profilometry
- 设计可旋转的柱面投影仪，通过开孔条纹实现全向投影
- 单相机系统下深度重建不确定度仅0.215毫米
- 适合需要全方位三维建模的应用场景
近年来，元宇宙与3D通信等领域对360度三维重建的需求显著增加，推动了高精度、大范围三维感知技术的发展。尽管数字条纹投影法因高精度和灵活实现而广泛应用，但仍存在单向投影和可用光谱受限等根本性缺陷。为此，本文提出一种基于圆柱机械投影仪的新型三维重建方法。该系统由旋转平台和带有ON/OFF双间隔开孔的圆柱形图案发生器组成，可实现多频相移条纹的全向投影。结合多波长解包裹算法与准标定技术，仅用单个相机即实现高精度三维重建。实验结果经重复性、可再现性分析及测量不确定度评估验证，表明系统具有可靠性能与实际可行性。重构深度的扩展不确定度为0.215毫米。
原文摘要 · Abstract (English)
The demand for 360-degree 3D reconstruction has significantly increased in recent years across various domains such as the metaverse and 3D telecommunication. Accordingly, the importance of precise and wide-area 3D sensing technology has become emphasized. While the digital fringe projection method has been widely used due to its high accuracy and implementation flexibility, it suffers from fundamental limitations such as unidirectional projection and a restricted available light spectrum. To address these issues, this paper proposes a novel 3D reconstruction method based on a cylindrical mechanical projector. The proposed method consists of a rotational stage and a cylindrical pattern generator with ON/OFF slots at two distinct intervals, enabling omnidirectional projection of multi-frequency phase-shifted fringe patterns. By applying a multi-wavelength unwrapping algorithm and a quasi-calibration technique, the system achieves high-accuracy 3D reconstruction using only a single camera. Experimental results, supported by repeatability and reproducibility analyses together with a measurement uncertainty evaluation, confirm reliable measurement performance and practical feasibility for omnidirectional 3D reconstruction. The expanded uncertainty of the reconstructed depth was evaluated as 0.215 mm.
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