期刊
OPTICS AND LASERS IN ENGINEERING
卷 138, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.optlaseng.2020.106366
关键词
Parallel-axis structured light system; Telecentric lens; 3D reconstruction model
类别
资金
- National Natural Science Foundation of China (NSFC) [61603360]
This paper introduces a novel and simple 3D reconstruction model based on a parallel-axis structured light system, which is more convenient and time-saving compared to traditional methods. Experimental results demonstrate that the proposed method can achieve high-precision 3D shape measurement.
Conventional high-accuracy three-dimensional (3D) reconstruction methods usually involve complicated and time-consuming system calibration. This paper presents a novel and simple 3D reconstruction model based on a parallel-axis structured light system. Compared to the traditional structured light system, the proposed system contains a perspective projection unit and a telecentric imaging unit. Instead of obtaining the complicated structured light system parameters, the proposed model only requires the retrieval of a product matrix which could be easily calibrated by using an ordinary white plane. For an arbitrary point A on the object surface, it is mathematically proved that the product matrix of its phase map and height distribution is proportional to the distance between A and projector optical center in XY plane, and independent of the depth in Z direction. Experiments were carried out to measure a step-height object and a cylindrical surface, and the results verify that the proposed method can achieve high-accuracy 3D shape measurement.
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