摘要
使用液晶显示器屏幕作为参考平面,并利用相机阵列实现了基于多视点的高反射表面面形精确重建。首先利用各相机获取参考平面靶标在标准平面镜中的镜像,通过镜面标定获得参考平面与各相机的外参,再利用参考平面的唯一性对相机阵列进行全局标定。然后用显示屏向被测面投射相移条纹,并通过各相机采集反射后的受调制图像,获得参考平面上的点与各视点归一化成像平面上图像点之间的密集反射对应关系,据此求得待测面相对于各视点的绝对点云坐标,最后依据全局参数进行拼接,从而实现对更大尺寸、更大曲率高反射表面的面形测量。同时基于参考平面和标准平面镜的平面性,提出一种共平面约束来优化视点几何参数和全局参数,减小系统误差。通过对不同形状的标准镜面进行测量,验证了所提方法的有效性和准确性。
Nowadays,three-dimensional measurement of highly reflective surface is an important part of industrial measurement.With the continuous development of automobile assembly,precision polishing,free-form surface processing and other industries,the demand for measurement of large size,large curvature and high reflective industrial parts such as aircraft tail,LCD panel,automobile body shell and windshield is increasingly strong.However,due to the large difference between the optical characteristics of the surface and the diffuse reflection object,it is difficult to achieve the ideal effect by the traditional three-dimensional measurement method.The phase deflection method is a non-contact high reflection surface 3D measurement method developed in recent years.Its high sensitivity and easy correction of system errors make it popular with many researchers.Generally,there are two main methods for the above measurement using deflection method:one is to improve the size of the screen and the field of view of the camera,but it is limited by accuracy and size.The other common method is to install a single-view system on the manipulator,and reconstruct a large size surface during the movement.However,the introduced manipulator system error reduces the accuracy,and the system mostly outputs the relative point cloud coordinates based on the gradient data,so the point cloud needs to be continuously spliced through the point cloud registration algorithm during the scanning process,so the calculation cost is high;however,this paper sets the camera array,and at the same time carries out the reconstruction based on absolute coordinates from multiple angles.It can effectively ensure the accuracy of local measurement,and realize accurate measurement of large size,large curvature and high reflection surface faster through the direct splicing of visual angles.In this paper,the LCD screen is used as the reference plane,and the camera array is used to realize the accurate reconstruction of the highly reflective surface shape based on multi
作者
王志卓
卢荣胜
WANG Zhizhuo;LU Rongshen(School of Instrument Seicence and Opto-electronics Engineering,Hefei University of Technology,Hefei 230009,China)
出处
《光子学报》
EI
CAS
CSCD
北大核心
2023年第9期200-212,共13页
Acta Photonica Sinica
基金
国家自然科学基金(No.51875164)。
关键词
多视点
相移偏折法
高反射表面测量
三维重建
相机标定
Multi-viewpoint
Phase deflection method
High reflective surface measurement
3D reconstruction
Camera calibration
