Abstract: 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.

Key words: engineering CAD drawings, retrieval, ring partition, topology-local vector quantization pattern, feature fusion, iterative quantization Hashing