高动态范围表面三维形貌重建新方法  

A New Method for 3D Shape Reconstruction with a High Dynamic Range Surface

作　　者：毛翠丽 卢荣胜[1] Mao Cuili;Lu Rongsheng(School of Instrument Science and Opto-Electronics Engineering,Hefei University of Technology,Hefei 230009,Anhui,China;School of Intelligent Manufacturing,Nanyang Institute of Technology,Nanyang 473004,Henan,China)

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 [2]南阳理工学院智能制造学院,河南南阳473004

出　　处：《激光与光电子学进展》2023年第7期141-150,共10页Laser & Optoelectronics Progress

基　　金：国家重点研发计划(2018YFB2003801);国家自然科学基金(51875164);河南省教育厅重点科研项目(21B535002);河南省重点研发与推广专项(科技攻关)(212102210048)。

摘　　要：利用光栅条纹投影法进行非接触式三维形貌测量已经成为各个领域中对复杂被测对象进行尺寸测量的主要方法。然而,对表面同时具有高反射率和低反射率区域的被测对象进行快速准确的三维测量,一直是众多学者的研究对象和工业中急需解决的问题。本文首先根据理论分析和仿真分析,得出投影不同条纹强度幅值在不同信噪比时的相位误差大小,据此进一步提出无需提前标定被测表面反射率及最佳投影条纹强度幅值时的高动态范围三维形貌测量新方法:首先利用两组不同强度幅值的相移光栅条纹图进行三维测量;然后对两次测量进行融合得出比较完整的三维形貌测量结果,通过实验验证了该方法的可行性和有效性;最后对反射率相差较大的被测物体表面进行三维形貌测量实验。根据实验结果可知,该方法不仅可以有效测量高动态范围表面,而且提高了测量效率,并为最近提出的高速测量方法(单个投影周期内两次采集条纹图)的有效性提供了理论与实验依据。Three-dimensional(3D)shape non-contract measurement with fringe projection profilometry is a primary method for measuring the size of complex objects in many areas.However,for an object whose surface has both high reflectivity and low reflectivity areas,rapid and accurate 3D measurements have been the research object of many scholars,and is considered an urgent problem that needs to be solved in the industry.In this study,the phase errors of different fringe projection intensity amplitudes at different signal-to-noise ratios are first obtained using both theoretical and simulation analysis.Further,a new method,which can achieve the high dynamic range shape measurements without requiring calibration of the measured surface reflectivity and the optimal projection fringe intensity amplitude in advance,is proposed.Specifically,two appropriate different fringe intensity amplitudes are projected,and the measurement results are combined.The feasibility and effectiveness of this method are verified experimentally.Finally,the 3D shape measurement experiment is carried out on the surface of the measured object with large reflectivity difference.According to the experimental results,this method can not only effectively measure a surface with a large range of reflectivity variations,but can also improve the measurement efficiency and provide a theoretical and experimental basis for the effectiveness of the recently proposed high-speed measurement method(double-shot-in-single-illumination).

关 键 词：仪器 测量与计量 条纹投影轮廓术 三维重建 高动态范围 条纹强度幅值 

分 类 号：O436[机械工程—光学工程]