Transactions of Materials and Heat Treatment

Title：Research on binocular vision method for full-length bending angle of bending plate

Authors： MENG De-an ZHAO Sheng-dun ZHANG Qi JIA Liang-xiao

Unit： Xi'an JiaoTong University

KeyWords： metal plate bending machine vision point cloud segmentation plane fitting

ClassificationCode：TP242.6

year,vol(issue):pagenumber：2013,38(6):104-110

Abstract：

In order to measure the full-length bending angle for large metal plate online, a new angle detection method based on binocular vision was presented. Firstly, point cloud data of the workpiece was obtained using the Gray code-phase shift technology. After the point clouds were simplified and segmented, an improved feature value method was used to fit the outer surface of workpiece and lower mold respectively. Then, the public vertical surface was confirmed,with which the isometric slice for the point clouds was conducted,the bending angle in the section place was obtained and the full-length bending angle corresponding to the single point colud data was calculated. Finally, according to the position coordinates of each point cloud data, the full length bending angle could be calculated completely. The results show that a great quantity of point cloud data can be retrieved by the above method instantly, which is equal to arrange tens of thousands of sensors on the workpiece, and the efficiency of the data acquisition and angle measurement accuracy are greatly improved.

Funds：

国家科技重大专项资助项目“高档数控机床与基础制造装备”（2010ZX04004-113）

Reference：

［1］Huntley J M. Optical shape measurement technology: past, present and future [A]. Proceeding of SPIE[C]. 2000, 4076(1): 162-173.
［2］Hartley R, Zisserman A. Multiple View Geometry in Computer Vision[M]. New York: Cambridge University Press , 2000.
［3］Snyder W E, Qi H. Machine vision[M]. New York: Cambridge University Press, 2010.
［4］于晓洋，吴海滨，尹丽萍,等.格雷码与相移结合的结构光三维测量技术[J].仪器仪表学报，2007,28（12）：2152-2156.Yu X Y, Wu H B, Yin L P, et al. 3D measurement technology based on structured light by combining Gray code with phase-shift[J]. Chinese Journal of Scientific Instrument, 2007,28(12):2152-2157.
［5］Zhang Z. A flexible new technique for camera calibration[J]. Pattern Analysis and Machine Intelligence, IEEE Transactions on, 2000, 22(11): 1330-1334.
［6］Heikkila J. Geometric camera calibration using circular control points[J]. Pattern Analysis and Machine Intelligence, IEEE Transactions on, 2000, 22(10): 1066-1077.
［7］Woo H, Kang E. A new segmentation method for point cloud data [J]. International Journal of Machine Tools & Manufature, 2002, 42（2）: 167-178.
［8］官云兰，程效军，施贵刚.一种稳健的点云数据平面拟合方法[J]. 同济大学学报:自然科学版，2008,36（7）：981-984.Guan Y L, Cheng X J, Shi G G. A robust method for fitting a plane to point clouds[J]. Journal of Tongji University:Natural Science Edition,2008, 36(7):981-984.
［9］游明，刘播，徐涛.数值计算方法[M].北京：科学出版社,2005.You M, Liu B, Xu T. Numerical Method[M]. Beijing: Science Press, 2005.
［10］郭仁生.机械工程设计分析和MATLAB应用[M].北京：机械工业出版社，2012.Guo R S. Mechanical Engineering Design Analysis and MATLAB Application[M]. Beijing: China Machine Press,2012.

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