Open AccessCalibration based on ray-tracing for multi-line structured light projection system
Author(s) -
Xiaoting Lu,
Qingyin Wu,
Huang Haotao
Publication year - 2019
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.27.035884
Subject(s) - structured light , subpixel rendering , computer science , projector , optics , structured light 3d scanner , ray tracing (physics) , robustness (evolution) , calibration , computer vision , projection (relational algebra) , coordinate system , artificial intelligence , algorithm , physics , scanner , pixel , biochemistry , chemistry , quantum mechanics , gene
Multi-line Structured Light Projection System (MSLPS) is widely used with the advantages of high-contrast stripes and high robustness in high-speed dynamic reconstruction in comparison with Phase Modulation System (PMS). However, existing calibration methods are either sophisticated or low-accuracy in large visual field application because the bending of line structured light plane caused by lens distortion is inevitable and projector calibration is necessary. Therefore, in this paper, we present an accurate and robust calibration method based on ray-tracing, which establishes accurate relationship between subpixel coordinates of each bending line structured light plane and 3D coordinates based on camera coordinate system without projector calibration. As long as placing a checkerboard at random positions, MSLPS can be calibrated and hence is more suitable in practical application. Experimental results demonstrated that, compared with existing line structured light strategies, the proposed method could achieve more accurate and robust 3D reconstruction and the calibration process is simpler and easier to implement.