基于手绘草图特征识别的机械零件3D建模  

3D modeling of mechanical parts using feature recognition from freehand sketch

作　　者：田小虎 王雪飞[1] 华顺刚[1] TIAN Xiao-hu;WANG Xue-fei;HUA Shun-gang(State Key Laboratory of High-Performance Precision Manufacturing,Dalian University of Technology,Dalian 116024,Liaoning Province,China)

机构地区：[1]大连理工大学,高性能精密制造国家重点实验室,辽宁大连116024

出　　处：《信息技术》2024年第9期64-70,共7页Information Technology

基　　金：国家自然科学基金资助项目(52175455)。

摘　　要：针对机械零件结构中包含圆孔棱边等特点,提出一种基于特征识别的零件3D建模方法。首先将手绘草图规整化为直线圆弧等组成的矢量图,然后采用特征点/线条检索及图元匹配识别圆孔和圆角,通过特征点检索及区块判别识别圆柱等形状特征。对于识别过程中出现的孤立线及隐藏线,定义形状修补规则,判断是否为棱柱型实体。最后根据识别出的信息生成各局部三维模型,并在全局坐标系下组合得到整体零件模型。实验表明,该方法能从手绘草图中识别生成包含加强筋等几何特征的机械零件模型,实现二维草图到三维模型的自动转换。Based on the characteristic containing the hole,edge and so on in mechanical parts,a 3D modeling method for mechanical parts is proposed by using feature recognition.Firstly,freehand sketch is regularized into vector graphics composed of lines,arcs and so on.Afterwards,feature points/lines detection and primitive matching are adopted to recognize holes and fillets.Likewise,feature points detection and block discrimination are adopted to recognize cylindrical and so on.For isolated lines and hidden lines that appeared during the process of recognition,the rules of shape repairing are defined to determine whether they were solid prism.Finally,according to the obtained information,partial 3D models are generated and merged into the complete part model in the global coordinate system.The experiment shows that this method can recognize and generate mechanical part models with geometric features such as ribs and so on from freehand sketch,and implement automatic conversion from 2D sketch to 3D model.

关 键 词：手绘草图 三维建模 机械零件 特征识别 投影变换 

分 类 号：TP391.7[自动化与计算机技术—计算机应用技术]