基于典型面匹配的机械零件检索方法  

Mechanical Parts Retrieval Based on Typical Face Matching

作　　者：高艺[1,2,3] 王斌[1,2,3] 胡楷模[1,4,2,3] 郑国勤[1,2,3] 

机构地区：[1]清华大学软件学院,北京100084 [2]信息系统安全教育部重点实验室,北京100084 [3]清华信息科学与技术国家实验室,北京100084 [4]清华大学计算机科学与技术系,北京100084

出　　处：《计算机辅助设计与图形学学报》2011年第4期640-648,655,共10页Journal of Computer-Aided Design & Computer Graphics

基　　金：国家自然科学基金(60625202;90818011);国家"八六三"高技术研究发展计划(2007AA040401);国家"九七三"重点基础研究发展计划项目(2010CB328001)

摘　　要：为了检索具有相似局部特征的机械零件,以支持设计的早期复用,提出一种基于典型面匹配的机械零件检索方法.该方法以零件的IGES标准表示作为输入,在离线处理阶段对模型库中的局部面进行训练,标识局部面相对于功能分类的区分度,并过滤非典型面以提高检索效率;在线检索阶段,通过离线处理的结果估算用户输入面的区分度,并根据区分度对输入面进行排序,最后采用贪心算法与数据库模型中的面进行匹配和相似度排序.在原型系统中的实验结果表明,由于避免了网格化造成的精度损失,且加入了对局部面区分度的离线计算过程,与通用三维模型检索算法相比,采用文中方法可检索出更多具有共同局部特征和相似功能的模型,从而更好地支持设计复用.This paper presents a typical face-based retrieval method to search mechanical parts with similar local features. The method takes the IGES standard representation as input. In the training phase, all the faces in the database are tested and assigned with a value indicating their distinction. Trivial faces and atypical ones with small areas are removed in this phase to improve online retrieval efficiency. In the query phase, we evaluate the distinction of the input faces by aligning them with faces in the database. The similarity between input faces and those in the database is achieved by applying a greedy algorithm. Our method avoids the information lost caused by mesh diseretization and introduces the training phase for local features. Experimental results from the prototype system show that the method can provide a favorable performance when applied to retrieve models with common local features or similar functionalities, and hence can support design reuse better than some other mesh-based methods.

关 键 词：CAD模型检索 面匹配 局部特征 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]