一种基于阶跃图像的条纹投影轮廓术校正方法  

A fringe projection profilometry correction method based on step image

作　　者：杨占力[1] 赵海文[1] 付津昇 戴士杰[1] YANG Zhanli;ZHAO Haiwen;FU Jinsheng;DAI Shijie(Institute of Robot and Automatiodden,Hebei University of Technology,Tianjin 300130,China;Tianjin Key Laboratory of Civil Aircraft Airworthiness and Maintenance,Civil Aviation University of China,Tianjin 300300,China)

机构地区：[1]河北工业大学机器人与自动化研究所,天津300130 [2]中国民用航空大学民用航空器适航与维修天津重点实验室,天津300300

出　　处：《河北工业大学学报》2020年第4期33-39,共7页Journal of Hebei University of Technology

基　　金：国家自然科学基金委员会与中国民用航空局联合基金(U1433117);中国民用航空科技重大项目(MHRD20130104)。

摘　　要：投影仪的非线性响应导致投影条纹图产生意外的变化,在条纹投影轮廓术中严重影响了最终的三维测量精度。以前的方法要么需要处理大量的图像,要么容易受到斜角投影的影响,而现有的伽玛校正方法并没有考虑到这一点。通过建立系统成像模型,分析了倾角投影对成像光谱的影响,提出一种基于阶跃成像的伽玛校正方法。由于数据在空间上的处理和阶跃图像的性质,该方法不需要计算就能实现对不同投影角度的伽玛参数进行可靠地估计。最后,通过实验验证了该方法的有效性。The gamma nonlinear response of a projector makes the projected fringe patterns yield unexpected changes,which seriously affects the final three-dimensional measurement accuracy in fringe projection profilometry.Previous methods either need to process large numbers of images or are susceptible to oblique-angle projection that has not yet been taken into account in existing gamma correction methods.In this paper,a gamma correction method based on stepimages is presented by establishing a system imaging model and analyzing the effect of oblique-angle projection on imag⁃ing spectrum.Due to data processed spatially and the nature of step-images,this method can achieve a reliable estimate for the gamma in different projection angles without the need of computation.The validity of the method is verified by do⁃ing experiments.

关 键 词：边缘投影轮廓测定法 伽玛校正 伽玛非线性响应 成像模型 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术] O439[自动化与计算机技术—计算机科学与技术]