人体扫描线点云精简与孔洞修补
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摘要
利用人体扫描系统获取的人体扫描线点云密度很高,在后期处理过程中必须对其进行精简。经过分析扫描线点云特征,采用宽度检测法对其进行处理,设置参数阈值T,当T=0.006D时,点云被精简至61%。同时,受扫描环境、系统算法本身缺陷等因素的影响,人体表面存在部分扫描盲区,使点云模型存在孔洞,重建人体表面前需采用空间灰色建模的方法对孔洞进行修补。利用弦长法确定孔洞是否存在;建立扫描线空间灰色模型SGM(1,1),有效地实现对扫描线点云的孔洞修补。
Because of high density of the scan line point clouds captured by body scanning system,simplification must be progressed. Width decision method is adopted,and the parameter T is set up.When T = 0. 006 D, point clouds are reduced to 61%. Meanwhile, influencing by the scanning environment and defects of algorithms,there exists the holes in some scan lines which is shoveled using space gray model. First,the holes are detected by chord length,then the model SGM( 1,1) of scan line is founded which will complete hole-filling efficiently.
Because of high density of the scan line point clouds captured by body scanning system,simplification must be progressed. Width decision method is adopted,and the parameter T is set up.When T = 0. 006 D, point clouds are reduced to 61%. Meanwhile, influencing by the scanning environment and defects of algorithms,there exists the holes in some scan lines which is shoveled using space gray model. First,the holes are detected by chord length,then the model SGM( 1,1) of scan line is founded which will complete hole-filling efficiently.
引文
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[2]李晓久,景晓宁.基于非接触式测量的人体点云简化方法[J].纺织学报,2012,33(7):144-148.LI Xiaojiu,JING Xiaoning.Study of body point cloud simplification based on non-contacted measurement[J].Journal of Textile Research,2012,33(7):144-148.
[3]LEE K,WOO H,SUK T.Data reduction methods for reverse engineering[J].The International Journal of Advanced Manufacturing Technology,2001,17(5):735-743.
[4]平雪良,李进亮,徐荣礼,等.逆向工程中扫描线类型数据的简化技术[J].江南大学学报:自然科学版,2006(3):258-260.PING Xueliang,LI Jinliang,XU Rongli,et al.Scan line data reduction for reverse engineering[J].Journal of Southern Yangtze University:Natural Science Edition,2006(3):258-260.
[5]LI Xiaozhi.Filling the holes of 3-D body scan line point cloud[C]//LI Xiaojiu.Proceedings of the 2nd International Conference on Advanced Computer Control,2010:334-338.
[6]DU J,ZHANG L Y,WANG H T.Hole repairing in triangular meshes based on radial basis function[J].Journal of Computer-Aided Design&Computer Graphics,2005(9):1976-1982.
[7]吕莹莹,郝伟,郭金金.三维人脸模型孔洞修补技术研究[J].计算机仿真,2012(1):195-198.LYingying,HAO Wei,GUO Jinjin.Hole-repairing of face model[J].Computer Simulation,2012(1):195-198.
[8]刘思峰,郭天榜,党耀国,等.灰色系统理论及其应用[M].北京:科学出版社,1999:75-208.LIU Sifeng,GUO Tianbang,DANG Yaoguo,et al.The Theory of Gray System and its Application[M].Beijing:Science Press,1999:75-208.
[9]ZHU Guangzhou.Gray modeling of hip girth based on the non-contacted human body measurement system[C]//LI Xiaojiu.Proceedings of the 2nd International Conference on Modelling and Simulation,2009:22-27.
[10]李晓久,朱广舟.人体胸围尺寸灰色模型建立[J].纺织学报,2005,26(5):77-79.LI Xiaojiu,ZHU Guangzhou.Establishment the grey model of bust girth[J].Journal of Textile Research,2005,26(5):77-79.
[11]PING Xueliang,ZHOU Rurong,AN Luling.Application of grey system theory to processing of measuring data in reverse engineering[J].Transactions of Nanjing University of Aeronautics&Astronautics,2003,20(6):36-41.