3D Rekonstruktion aus perspektivischen Konzeptzeichnungen

In this work a technique for reconstructing digital 3D models from perspective sketches is introduced. The goal for the reconstruction process is to require little user interaction and no user knowledge about geometric modeling. With this assumptions such a system can provide an useful extension for digitalization of design concepts. In this work the sketches are decomposed in curves approximated by polygonal chains. Afterwards the curves are reconstructed in 3D to obtain a wireframe model. This is achieved in two steps. First the position for the endpoints of the curves are determined in 3D then the shapes of the curves. The 3D endpoints of the curves are determined by discretization of the volume. For the resulting voxels the corresponding 2D endpoints of the curves are obtained by projecting the voxel into several sketches. Then the voxels are evaluated by the connectivity between the corresponding 2D endpoints. Thus the 3D endpoints and there connectivity are obtained. The shape is reconstructed by extruding the 2D curve into the object space and fitting a polygonal chain between the 3D endpoints on the resulting surface