基于相移轮廓术的双采样运动物体三维重构  

3D reconstruction of the moving object with double-shooting based on phase shifting profilometry

作　　者：张庆辉[1] 李浩 吕磊 卢盛林 潘威 Zhang Qinghui;Li Hao;Lv Lei;Lu Shenglin;Pan Wei(School of Information Science and Engineering,Henan University of Technology,Zhengzhou 450001,China;Department of R&D,OPT Machine Vision Tech Co.,Ltd,Dongguan 523860,China)

机构地区：[1]河南工业大学信息科学与工程学院,河南郑州450001 [2]广东奥普特科技股份有限公司研发部,广东东莞523000

出　　处：《红外与激光工程》2023年第12期173-178,共6页Infrared and Laser Engineering

基　　金：河南省重大公益专项(201300311200);河南省自然科学基金面上科学基金项目(222300420427)。

摘　　要：相移轮廓术因其高精度和高鲁棒性广泛应用于三维重构。由于需投射多幅条纹图到物体表面,相移轮廓术要求物体在重构过程中保持静止,导致运动物体的三维重构精度较低。文中提出了一种基于相移轮廓术的双采样运动物体三维重构方法。首先调整相机和投影仪时序,使投影仪投射一幅条纹图的同时,相机完成两次采集。然后分析物体运动对双采样条纹图的影响,并建立条纹描述方程。结合物体的运动信息,提取混合相移条纹图中的相位信息。最终对拍摄条纹图进行复用,提高运动物体的三维重构帧率。实验结果表明,该方法不仅可以精确重构运动物体,减少运动误差,还在投影速度受限的前提下提高了运动物体的三维重构帧率。Objective Phase shifting profilometry(PSP)is one of the most commonly used techniques in 3D measurement,which has the advantages of high accuracy and robustness to ambient light and reflectivity variation.During the reconstruction of PSP,at least three sinusoidal fringe patterns with phase shift are projected onto the surface of the object;the camera captures the ones reflected from the object.Because of the height of the object,the fringe patterns on the object surface will have distortions.The phase information existing in the fringe pattern is employed to analyze the deformation of the fringe patterns.At last,the object is reconstructed based on the phase information and system parameters.Because of multiple fringe patterns are used,the traditional PSP requires the object must be kept stationary during the reconstruction process.Errors will occur if the object moves during the fringe projecting and capture process.However it is difficult to meet this requirement in dynamic scenes.Therefore,it is important to improve the reconstruction accuracy of moving object.For this purpose,a new method with high frame rate and accuracy is proposed based on PSP.Methods This paper proposes a new method to reduce the measurement error caused by moving objects at dense frame rate.First of all,trigger control equipment is added to the camera and projector.The equipment ensures that,for each projection,two consecutive images are captured before the next projection(Fig.1).Then,the phase retrieval algorithm is proposed.As there is no fringe pattern shift among the captured two images of the same projection,the phase shift is introduced by the object motion.By analyzing the phase variation caused by the motion,the reconstruction model describing the fringe patterns with motion is given.At last,the object is reconstructed based on the phase information and system parameters.The proposed algorithm can achieve high frame rate for the reconstruction of object with motion(Fig.2).Results and Discussions The experiments are implemented to

关 键 词：相移轮廓术 动态测量 三维重构 高帧率 

分 类 号：O438.1[机械工程—光学工程]