NURBS surface generation based on the feature extraction techniques in the reverse engineering

作为逆向工程中的基本技术，我们发展了柏拉图实体的分割技术，以及识别解析曲面(如圆锥曲面和球面)的分割技术，从而基于特征线分割剩余的自由曲面。我们得出结论，基于直线的方法是其中最好的方法。我们还改进了T-Spline的组合算法。此外，我们还开发了加速分割算法的技术。

As the fundamental techniques in the reverse engineering, we developed the segmentation techniques such as the one with platonic solids, and the one identifying the analytic surfaces for example, conics and spheres, and thus segmenting the remaining free-form surfaces, based on the feature lines. We concluded that the line-based method is the best among them. We also enhanced the combination algorithm of T-splines. Moreover we developed the technique to accelerate the segmentation algorithm.