作者：丁一飞, 王永红, 胡悦, 黄安琪, 但西佐

作者单位：合肥工业大学仪器科学与光电工程学院, 安徽 合肥 230009

关键词：光栅投影;系统标定;样本块匹配;阶梯标定

摘要：

针对直接三角法为模型的光栅投影测量技术标定过程需要前后移动参考平板以获取标定平面的方法，提出一种改进的阶梯标定方法。该方法使用一个固定阶梯面作为标定板，将数字光栅投影到阶梯面后，再通过图像延拓的方法获得不同位置的参考平面条纹图，以获取标定平面，无需移动标定板即可实现标定过程，简化标定步骤和标定系统。实验结果表明：使用样本块匹配方法延拓获得的光栅条纹图边界衔接效果很好，视场均匀，延拓效果好；使用阶梯标定方法进行实际测量并获得三维结果，证明其实用可行。采用该方法克服传统标定方法需要移动参考平面的局限性，简化系统标定步骤，无需标定板移动装置，减少标定采集图像数量，扩大适用范围。

Step calibration method of grating projection based on exemplar matching

DING Yifei, WANG Yonghong, HU Yue, HUANG Anqi, DAN Xizuo

School of Instrument Science and Opto-electronics Engineering, Hefei University of Technology, Hefei 230009, China

Abstract: In grating projection profilometry based on direct triangulation model, the calibration process needs to move reference plate back and forth to obtain calibration planes. To solve the problem, this paper proposes an improved step calibration method. The method uses a fixed step surface as calibration target, when the digital grating projected to the step surface, reference plane fringe in different positions was obtained by extended image method, and then the calibration planes were also obtained. Now the calibration process can be achieved without moving the reference plate, the calibration procedure and calibration system are simplified too. Experimental results show that the grating fringe images obtained via exemplar matching method,have a good result of boundary convergence continuation of grating image, uniform field of view, the fringe pattern and gray level were consistent. Use the step calibration method for actual measurement and get the object three-dimensional morphology. It is proved that this method is accurate and reliable. This method overcomes the limitations of the traditional calibration method that we need move reference plate, simplifies the system calibration procedures, dispenses with calibration plate mobile device, reduces the number of collected images, expand its scope of application.

Keywords: grating projection;system calibration;exemplar matching;step calibration

2016, 42(8): 7-12  收稿日期: 2016-2-17;收到修改稿日期: 2016-3-21

基金项目: 国家自然科学基金项目（51375136）；中航工业产学研专项（CXY2013HFGD22）

作者简介: 丁一飞(1990-),男,安徽庐江县人,硕士研究生,专业方向为仪器仪表工程。

参考文献

[1] 尚忠义,李伟仙,董明利,等. 基于四步相移光栅投影的三维形貌测量系统[J]. 应用光学,2015(4):584-589.
[2] 马勇平. 光栅投影相位测量轮廓术在SMT锡膏三维检测中的应用研究[J]. 电子质量,2015(6):1-4.
[3] 王选泽,吴雅君,何涛. 一种从粗到精逐步细化的变尺度光栅投影测量方法[J]. 应用光学,2015(5):774-777.
[4] 刘顺涛,骆华芬,陈雪梅,等. 结构光测量系统的标定方法综述[J]. 激光技术,2015(2):252-258.
[5] XU J, XI N, ZHANG C, et al. Real-time 3-D shape inspection system of auto motive parts based on structured light pattern[J]. Optics & Laser Technology,2011,43(1):1-8.
[6] XU J, DOUET J, ZHAO J G, et al. A simple calibration method for structured light-based 3-D profile measurement[J]. Optics &Laser Technology,2013,48(5):187-193.
[7] 肖丹,陈良洲,干江红. 基于数字光栅相移法的三维重构[J]. 光电技术应用,2011,26(5):17-20.
[8] 王鹏,张求知,李文强,等. 基于成像光线空间追踪的摄像机标定方法研究[J]. 仪器仪表学报,2015(1):224-229.
[9] 叶峰,王敏,陈剑东,等. 共面点的摄像机非线性畸变校正[J]. 光学精密工程,2015,23(10):2962-2970.
[10] 安东,陈李,丁一飞,等. 光栅投影相位法系统模型及标定方法[J]. 中国光学,2015(2):248-254.
[11] SU X Y, SONG W Z, CAO Y P, et al. Both phase-height mapping and coordinate calibration simultaneously in PMP[C]//Proceedings of the International Society for Optical Engineering, 19th Congress of the International Commissing for Optics:Optics for the Quality of Life. Firenze:SPIE Press,2003:847-875.
[12] 黄菁,朱日宏,陈磊. 基于样本块匹配的干涉图延拓方法[J]. 光学学报,2007(7):1217-1223.
[13] 周美丽,白宗文. 基于样本块的图像修补系统设计[J]. 电子测量技术,2015,38(8):73-75.
[14] CRIMINISI A, PÉREZ P, TOYAMA K. Region filling and object removal by exemplar-based image inpainting[J].IEEE Transactions on Image Processing,2004,13(9):1200-1212.
[15] 王永红,李骏睿,孙建飞,等. 散斑干涉相位条纹图的频域滤波处理[J]. 中国光学,2014,7(3):389-395.