摘要
针对企业在设计创新过程中大量采用已有计算机辅助设计(CAD)图纸进行设计重用的情况,提出了一种基于哈希的二维工程CAD图纸检索方法。首先基于环形分割算法提取工程CAD图纸中每个组件对象几何特征;基于传统LBP算子提出了一种局部拓扑矢量量化模式(T-LVQP),实现对各个组件拓扑特征的提取;然后基于协方差描述符融合几何特征和拓扑特征,通过LBG算法将所有组件按照几何特征分组后得到工程CAD图纸的特征向量表达;最后通过迭代量化哈希算法生成图纸的哈希序列。实验结果表明,该算法检索速度快、准确度高,对于二维工程CAD图纸具有较好的检索效果。
In the process of design innovation,a large number of companies use existing computer aided design(CAD)drawings as the basis for design reuse.In this paper,hash algorithm is applied to the retrieval of 2D engineering CAD drawings.The algorithm extracts geometry features of each component in the engineering CAD drawing based on ring partition,and the topology of local vector quantization pattern(T-LVQP)is proposed to extract the topological features of each component based on LBP operator.Then,all components in the drawings are classified into groups according to geometric features by the LBG algorithm,and the feature vector of each drawing is obtained via fused features based on the co-variance descriptor.Finally,the Hash sequence is generated by iterative quantization Hashing.The experimental results show that the algorithm has good performance in speed and accuracy for the retrieval of 2D engineering CAD drawings.
作者
叶颖
张琪
苏智勇
YE Ying;ZHANG Qi;SU Zhiyong(School of Automation,Nanjing University of Science and Technology,Nanjing Jiangsu 210094,China)
出处
《图学学报》
CSCD
北大核心
2018年第5期963-969,共7页
Journal of Graphics
关键词
工程CAD图
检索
环形分割
局部拓扑矢量量化模式
特征融合
迭代量化哈希
engineering CAD drawings
retrieval
ring partition
topology-local vector quantization pattern
feature fusion
iterative quantization Hashing
