摘要
三维数字图像相关技术在获取工件表面信息方面有重要应用,针对单相机系统在全场测量中的局限性及多相机系统在全场测量中的复杂性,本文提出一种双平面镜辅助的双相机视觉测量方法,并应用在三维重建中。即:分析像素点到三维点的实际映射关系,基于公垂线中点法进行目标点三维重构,确定棋盘格标定板角点的三维坐标;分析角点在镜面的虚实对应关系,标定镜面位置方程,得到反射变换矩阵;通过反射变换矩阵完成物面的虚实转换,最终实现三维全场测量。为验证该方法的可行性和可靠性,分别进行了静态实验和动态实验。结果表明:在游戏币静态实验中,其正反轮廓的三维重建效果良好;在五棱铝柱热变形动态实验中,铝柱外侧表面高度变化均值与Ansys软件的仿真结果基本一致,且优于在镜面上喷涂散斑的重建方法,具有较高的精度。
Objective Digital image correlation(DIC)technology is a processing method commonly employed for image matching,and meanwhile after nearly forty years of development,its accuracy,efficiency,practicality,and other aspects have yielded significant improvement.With the development and progress of science and technology,DIC technology for threedimensional(3D)measurement should also be economical and practical,with the utilization of relatively simple devices for a full range of functions.DIC measurement systems with the assistance of the camera and external equipment can also be realized with multiple viewpoints and multi-directional measurements,on which many scholars have carried out thorough research.Among them,the single camera system has a flexible field of view adjustment and simple optical path,but features poor stability and low accuracy.The multi-camera system requires the adoption of multiple cameras,and the calibration process is complicated.Although the multi-camera measurement system can improve the range and accuracy of 3D measurement,it is difficult to be widely leveraged in 3D full-field measurement due to the high requirements of environmental conditions and the expensive cameras.Given the shortcomings of the existing single-camera and multicamera systems,we propose a dual-camera 3D reconstruction method assisted by a dual-plane mirror.Methods We put forward a visual 3D measurement method assisted by a dual-plane mirror,which is to analyze the virtual and real correspondences of the corner points in the mirror surface and thus obtain the reflection transformation matrix.Meanwhile,the virtual and real transformations of the object surface are completed by the reflection transformation matrix,and the 3D full-field measurements are realized finally.Additionally,this method avoids spraying diffuse spots on mirrors to take up the spatial resolution of the camera,making the solution of the reflection transformation matrix easy and efficient.Firstly,the image information of the front surface and the back sid
作者
李桂华
王紫威
孙卫庆
葛朋祥
王浩宇
张梅
Li Guihua;Wang Ziwei;Sun Weiqing;Ge Pengxiang;Wang Haoyu;Zhang Mei(School of Electrical Engineering and Automation,Anhui University,Hefei 230601,Anhui,China;School of Mechanical and Electrical Engineering,Anhui Jianzhu University,Hefei 230601,Anhui,China)
出处
《光学学报》
EI
CAS
CSCD
北大核心
2024年第8期84-93,共10页
Acta Optica Sinica
基金
安徽省自然科学基金(1908085ME172)
安徽建筑大学启动基金(2023QDZ12)。
关键词
测量
双相机
数字图像相关
全场测量
热变形
measurement
dual camera
digital image correlation
full-field measurement
hot deformation
