3D Reconstruction from 2D Line Drawings only with Visible Vertices and Edges

The human vision system can reconstruct a 3D object easily from single 2D line drawings even if the hidden lines of the object are invisible.Now,there are many methods have emulated this ability,but when the hidden lines of the object are invisible,these methods cannot reconstruct a complete 3D object.Therefore,we put forward a new algorithm to settle this hard problem.Our approach consists of two steps:(1)infer the invisible vertices and edges to complete the line drawing,(2)propose a vertex-based optimization method to reconstruct a 3D object.