Research and design of drawings retrieval system based on content
Xiongfei Li · Jisuanji gongcheng yu sheji · 2009
Content-based drawings retrieval is key technology in drawings reuse.Spatial relationships are major feature of drawings content.Owing to complexity of spatial relationships description and high dimension of feature vector,it's difficult to compare spatial relationships in content-based drawings retrieval.To overcome these drawbacks,a method to simplify topological relationship is proposed.Feature vector extracted from graph spectra can reduce dimension,which effectively accelerate retrieval through multi-dimensional in-dexing mechanisms.The system is based on combined content consisted of topological relationship,shape,and directional relationship,which results in improvement in the retrieval recall and precision.The system extracts the features of topological relationships and shape offline,while directional relationships performed online,which results in improvement in efficiency.