为了实现被拍摄物体的三维重建,设计了一种单相机-圆柱-锥形反射镜面共轴的全视角立体成像系统结构,并提出了系统中物点与全视角图像中像点的投影映射方法.被拍摄物体通过圆柱-锥形反射镜的2次反射成像在相机获取的图像中形成具有全视角信息的环行立体像对,立体像对中符合外极线约束的像点对与相应物点存在对应关系,在投影变换基础上进行立体像点对匹配后,根据图像中像点对的坐标位置可得出相应物点的三维坐标值.最后在3DSMAX构造的虚拟装置上进行仿真实验,实现了拍摄物体的三维重建和全视角浏览,验证了算法的有效性.
This paper designs a configuration of a coaxial complete-view stereo imaging system based on single camera and cylinder-conical mirror for three-dimensional reconstruction of objects.We also introduce a projective mapping algorithm between the object-points and the image-points of complete-view image.The circinal stereo image pairs that have complete-view information can be gained through two reflections of the cylinder-conical mirror.In the circinal stereo image pairs,there is a correlation between object-points and image-points that corresponds to the restriction of epipolar line.On the basis of projection,stereo image-points matching is done,so the three-dimensional coordinate values of relevant object-points can be gained according to the coordinate positions of image-points.Finally,after the simulated experiment based on the 3DS MAX virtual equipment,we implement objects' three-dimensional reconstruction and its complete-view browsing,which demonstrates the validity of the algorithm.