基于双向条纹投影的复杂纹理物体三维测量  

Three-Dimensional Measurement of Complex Textured Objects Based on Bidirectional Fringe Projection

作　　者：张巍 陈玉翀 姚鹏程 盖绍彦[1,2] 达飞鹏[1,2] Zhang Wei;Chen Yuchong;Yao Pengcheng;Gai Shaoyan;Da Feipeng(School of Automation,Southeast University,Nanjing 210096,Jiangsu,China;Key Laboratory of Measurement and Control of Complex Systems of Engineering,Ministry of Education,Southeast University,Nanjing 210096,Jiangsu,China)

机构地区：[1]东南大学自动化学院,江苏南京210096 [2]东南大学复杂工程系统测量与控制教育部重点实验室,江苏南京210096

出　　处：《光学学报》2024年第9期93-104,共12页Acta Optica Sinica

基　　金：江苏省前沿引领技术基础研究专项(BK20192004C);江苏省高校优势学科建设工程资助课题。

摘　　要：针对结构光系统中复杂纹理的反射率不连续会引起测量误差这一问题,分析并构建了其误差模型,指出了相位误差与相位梯度及灰度梯度之间的相关性,并由此提出了一种基于双向条纹投影的高精度复杂纹理物体测量方法。该方法通过投影横、纵光栅获取双向相位信息,并利用提出的映射方法将横向相位映射至纵向,与原纵向相位进行线性运算从而得到平均相位。然后,计算提取的物体纹理边缘切线和校正后相位梯度的夹角,采用相应的误差补偿算法对平均相位进行补偿,最终重建得到校正后点云。对比实验的结果表明,在同等测量效率下,所提方法能够以更高的精度重建复杂纹理物体,相较传统方法,其平均绝对误差和均方根误差最高可降低45.4%和50.1%。Objective Fringe projection profilometry(FPP)has been widely adopted in numerous fields recently,owing to its advantages such as rapid measurement speed,high precision,non-contact,and cost-effectiveness.However,for objects with complex textures,the camera defocus,which is unavoidable,implies that each pixel on the imaging plane of the camera essentially represents the convolution of the point spread function(PSF)and the reflected light intensity from each point within the region.In regions where reflectivity changes abruptly,diverse reflectivities are displayed by points within the range of the PSF.This leads to cross-contamination,resulting in subsequent phase errors that ultimately impact the final reconstruction accuracy.Within the PSF range,due to the different reflectivity of each point in the area of reflectivity mutation,the reflected light at each point contaminates each other after camera defocus,resulting in phase errors that ultimately impact the final reconstruction accuracy.Conventional solutions are principally divided into two categories:One approach is to estimate the PSF distribution by dividing the phase into correct and erroneous regions and compensating for the erroneous regions using the adjacent correct regions.However,this approach relies heavily on the accuracy of the PSF estimation.The other approach incorporates the single-pixel imaging method(SIM)for error compensation,but this method is inefficient in terms of measurements and fails to accommodate a high degree of camera defocus.To address these issues,we propose a three-dimensional(3D)measurement method for complex textured objects based on bidirectional fringe projection,and a structured light 3D measurement system has been established.The results of the comparison experiments demonstrate that the proposed method can reconstruct complex textured objects with a higher level of precision under the same measurement efficiency.Methods In our work,we proposed a 3D measurement of complex textured objects based on bidirectional fringe proje

关 键 词：测量 三维测量 相移技术 双向条纹 复杂纹理 误差校正 

分 类 号：TN247[电子电信—物理电子学]