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The Parameters Research of 3D Vision Reconstruction System Based on Parallel Mechanism

Author: ZhangZhenBo
Tutor: KongLingFu
School: Yanshan University
Course: Applied Computer Technology
Keywords: Parallel mechanism Reconstructed space Self-occlusion Point cloud curvature Quadratic parametric surfaces
CLC: TP391.41
Type: Master's thesis
Year: 2009
Downloads: 37
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Abstract


Parallel mechanism with its own number of advantages , at home and abroad in recent years, much attention . Combination of 6 - DOF parallel mechanism structured light vision technology to build a special significance and application prospects based the parallel institutions 3D visual reconfigurable systems . 3D visual reconstruction of the main parameters of the system based on parallel mechanism as the object of study , based on in-depth analysis of the research status of several important indicators . First , based on the analysis of the optical triangulation principle , design the reconstruction of the system of the three-dimensional visual space optical path diagram , the establishment of a world coordinate system , the mathematical transformations between the model the camera observation coordinate system and the image coordinate system . This model simplifies the setting of the original model , making the system more general applicability . Secondly, a comprehensive analysis of the CCD camera system , digital projection system , parallel mechanism workspace and systematic errors , and other factors , optimizing the design of the structural parameters of the system , and on this basis given reconfigurable systems based the parallel institutions 3D visual Reconstruction of the spatial extent . Again, for the self-occlusion problems prevalent in the structured light 3D reconstruction system , and the phenomenon of self-occlusion detection method , which uses the secondary parametric surfaces based on Euclidean distance to estimate the point cloud curvature , by the curvature variation analysis of point cloud data reconstruction of the object to determine the existence of self-occlusion . Experiments show that the change in curvature of the the step point cloud data has a great difference between the change in curvature of the continuous point cloud data , the use of such a special curvature changing phenomenon surface reconstruction can be determined whether there is a self - shielding phenomenon , and more accurate positioning block location. The parallel mechanism has a unique advantage in terms of the determination of the spatial orientation , with its motion characteristics can reduce self-occlusion phenomenon in order to gain more surface three-dimensional information . Finally, verified by experimental simulation of system error , the validity and correctness of the self-occlusion algorithm .

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CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > Computer applications > Information processing (information processing) > Pattern Recognition and devices > Image recognition device
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