Stereo vision based hand-held laser scanning system design

Hanwei Xiong; Jun Xu; Jinming Wang

doi:10.1117/12.907044

1 December 2011 Stereo vision based hand-held laser scanning system design

Hanwei Xiong, Jun Xu, Jinming Wang

Proceedings Volume 8201, 2011 International Conference on Optical Instruments and Technology: Optoelectronic Measurement Technology and Systems; 82012A (2011) https://doi.org/10.1117/12.907044
Event: International Conference on Optical Instruments and Technology (OIT2011), 2011, Beijing, Beijing, China

Abstract

Although 3D scanning system is used more and more broadly in many fields, such computer animate, computer aided design, digital museums, and so on, a convenient scanning device is expansive for most people to afford. In another hand, imaging devices are becoming cheaper, a stereo vision system with two video cameras cost little. In this paper, a hand held laser scanning system is design based on stereo vision principle. The two video cameras are fixed tighter, and are all calibrated in advance. The scanned object attached with some coded markers is in front of the stereo system, and can be changed its position and direction freely upon the need of scanning. When scanning, the operator swept a line laser source, and projected it on the object. At the same time, the stereo vision system captured the projected lines, and reconstructed their 3D shapes. The code markers are used to translate the coordinate system between scanned points under different view. Two methods are used to get more accurate results. One is to use NURBS curves to interpolate the sections of the laser lines to obtain accurate central points, and a thin plate spline is used to approximate the central points, and so, an exact laser central line is got, which guards an accurate correspondence between tow cameras. Another way is to incorporate the constraint of laser swept plane on the reconstructed 3D curves by a PCA (Principle Component Analysis) algorithm, and more accurate results are obtained. Some examples are given to verify the system.

Citation Download Citation

Hanwei Xiong, Jun Xu, and Jinming Wang "Stereo vision based hand-held laser scanning system design", Proc. SPIE 8201, 2011 International Conference on Optical Instruments and Technology: Optoelectronic Measurement Technology and Systems, 82012A (1 December 2011); https://doi.org/10.1117/12.907044

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KEYWORDS

3D scanning

Cameras

Laser scanners

Stereo vision systems

Principal component analysis

3D modeling

Laser systems engineering

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