Abstract:

In practical applications, 3D reconstruction often faces a series of 2D contour lines rather than the volume data we often process, so studying 3D reconstruction based on contours has important practical values.  The key technologies of 3Dreconstruction based on multiple contours include contours corresponding, contours splicing, crotched contours handling, and terminal contours closing . The concrete solutions to each step of 3D construction of contours are given. According to the winding direction issue of contours, we propose a method of gauging the sum of angles, avoiding error judgment of the winding direction of contours. For the crotching issue of one contour corresponding to multiple contours, we give a way of splitting contours based on the circumference ratio of corresponding contours. We also give the means of maximum angle in order to reduce the calculation time on triangulating terminal contours. The proposed solutions can achieve correct contours splicing of any contours, guarantee that each step of the solution is correct and effective, and they are more universal compared to other solutions.

Key words: contour;3D reconstruction;Delaunay triangulate;convex hull