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《Journal of Graphics》 2017-04
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Topology Authentication of 2D Engineering CAD Drawings Based on Hashing

MA Xiaobin;YE Ying;SU Zhiyong;School of Automation, Nanjing University of Science and Technology;  
Since it's difficult to authenticate the topological relation in the 2-dimensional engineering CAD drawing, a topological integrity authentication algorithm is proposed based on Hashing in this paper. Firstly, the algorithm extracts the topological relations of the drawings to generate the topology graph. Secondly, the components in the engineering CAD drawing are encoded, and the local topological quantization pattern(LTQP) is proposed to quantize the topological features of each component. Then, the components are divided into five categories according to their coding, and a Hash sequence is generated by discrete cosine transform based on the LTQP values. Finally, the Hash sequence of each category is combined to obtain the complete Hash sequence of the drawing. The experimental results show that the algorithmis robust to rotation, scaling and translation in engineering CAD drawings, and is vulnerable to the change of topological connection. By classifying the components to generate a Hash sequence, the algorithm can locate the type of components which is subjected to the topology attack.
【Fund】: 国家自然科学基金项目(61300160)
【CateGory Index】: TP391.72
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