17 November 2011 Stereo vision system based on the laser dot matrix projection
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Proceedings Volume 8197, 2011 International Conference on Optical Instruments and Technology: Optical Systems and Modern Optoelectronic Instruments; 819704 (2011) https://doi.org/10.1117/12.906542
Event: International Conference on Optical Instruments and Technology (OIT2011), 2011, Beijing, Beijing, China
Abstract
Binocular stereo vision system has been widely used in 3D shape and deformation measurement. Many experimental systems and instruments have been developed based on this method. To realize the stereo vision measurement, the measured surface must carry some image "structures", such as points, fringes, or even random speckles, so that the parallax of the dual camera could be obtained by matching the "structures". However, for on-line inspection of black surface, the general projection methods are impossible to produce the appropriate "structures". In this paper a new binocular stereo vision system based on the laser dot matrix projection is presented. The laser projector is made up of two pieces of orthogonal fine grating and laser diode, when the laser beam was projected to the grating, a laser dot matrix will be formed and this high contrast dot matrix could be imaged on any surfaces, including the black surfaces. Furthermore, the image quality is greatly improved by mounting a red color filter (if a red laser) on the camera lens. Finally, a 3D shape measurement of a black cylinder is completed to verify the validity of the system.
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Chenglin Liu, Shaopeng Ma, Qinwei Ma, Xiangfu Zeng, "Stereo vision system based on the laser dot matrix projection", Proc. SPIE 8197, 2011 International Conference on Optical Instruments and Technology: Optical Systems and Modern Optoelectronic Instruments, 819704 (17 November 2011); doi: 10.1117/12.906542; https://doi.org/10.1117/12.906542
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