基于镜像几何约束的单摄像机三维重构  

Three-Dimensional Reconstruction Method Using Single CCD Based on Geometric Constraint of Bilateral Symmetry

作　　者：胡春海[1] 刘斌[1] 

机构地区：[1]燕山大学测试计量技术及仪器河北省重点实验室,河北秦皇岛066004

出　　处：《中国激光》2010年第10期2576-2581,共6页Chinese Journal of Lasers

基　　金：河北省教育厅科学发展计划(2006455)资助课题

摘　　要：采用带有正八边形标记点的平面镜和单目CCD相机对空间物体进行三维重构。依据镜像对称几何学原理,利用空间物体与其在平面镜中的像构建镜像对称结构。镜像对称物体的单幅透视图几何等价于对称视点下的两幅视图,它们相差一个反射变换,并且具有自极几何对应性。平面镜不仅是对称面,而且还被当作标定平面,并利用灭点约束下的正八边形标记点计算相机外参矩阵。实验验证了该方法的有效性,给出三维重构结果,总结了其优势和局限性。其中设计的正八边形稀疏标记点同时具有正交性和平行性的几何约束,为现场标定相机外参数提供了一种新的解决方案。A new method of three-dimensional（3D） reconstruction using single CCD is proposed.A flat mirror with regular octagonal markers and a single CCD camera are used in the method.Bilaterally symmetrical structure is obtained by utilizing the object in space and its image in the flat mirror based on geometry of bilateral symmetry.A single perspective image of this structure is equivalent to two perspective views of half of the structure.The two halves are projective equivalent in difference of a reflection transformation and the structure is auto-epipolar in the image taken by the camera.Flat mirror is not only a symmetrical plane,but also used as calibration plane.Extrinsic parameters of the camera are calculated by using vanishing point constraint of regular octagonal markers.The validity of the proposed method is proved experimentally and the results of 3D reconstruction are given.The advantages and limitations of this method are summarized.The designed regular octagonal sparse marker is possessed by orthogonality and parallelism at the same time.It is a new solution for online calibration of camera extrinsic parameters.

关 键 词：机器视觉 镜像立体视觉 镜像对称几何 平面镜 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]