基于轮廓线法的汽车类外观专利图像三维重建

摘要

对立体产品的外观设计专利图像进行三维重建是外观设计专利三维检索的基本前提。结合汽车类外观专利图像的特点，提出汽车类外观专利图像三维重建方法。该方法利用三视图理论及汽车模型的对称性，根据俯视图信息确定主视图与后视图之间在不同高度的距离，进而获取三维空间点坐标；对车轮部分的连接进行特殊处理，并按照子轮廓线连接法构造四角面片，实现三维模型的重建。实验结果表明：1）与传统方法相比错误面片数降低了19．4％；2）重建效果图在外形上与实际物体更为接近。%To carry out 3D reconstruction on exterior design patent images of 3-dimensional products is the basic premise of 3D retrieval of exterior design patents.By combining the characteristics of automobile design patent images,we propose a 3D reconstruction approach for automobile design patent images.The approach uses three-view theory and automobile model’s symmetry to determine the distances between the front view and the rear view at different heights according to the top view information and then further obtains the points coordinates in 3D space.For the connection of the wheel part we make a special processing,and construct the quadrilateral facets by using sub-contour connecting method,thus realise the reconstruction of 3D model.Experimental results show that:1 )compared with traditional methods,the rejection rate of error facets has a 1 9.4% reduction;2)the reconstruction effect figure is more close to the actual object.