样本块匹配光栅投影阶梯标定方法  

Step calibration method of grating projection based on exemplar matching

作　　者：丁一飞[1] 王永红[1] 胡悦[1] 黄安琪[1] 但西佐 

机构地区：[1]合肥工业大学仪器科学与光电工程学院,安徽合肥230009

出　　处：《中国测试》2016年第8期7-12,共6页China Measurement & Test

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

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。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.

关 键 词：光栅投影 系统标定 样本块匹配 阶梯标定 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]