摘要
随着工业自动化程度的提高,工件在线实时测量的需求越来越大,将待测工件与标准工件的三维形貌进行差异性检测,从而实现快速合格产品的筛选具有重要的研究意义。传统的差异性检测方法通常采用反向条纹技术,它是通过摄像机与投影仪之间的坐标对应关系,投射到标准工件上的条纹成直线分布,当待测工件放置在同一位置时,直接由直条纹的变形量直观反映出待测工件与标准工件的差异性。提出了一种实时计算莫尔轮廓术对工件进行差异性检测的方法。采用计算莫尔轮廓术的单帧采集特性,仅需计算截断相位并建立差异性评价函数模型,用评价函数的大小直接反应差异性特征,通过评价函数的最值点来跟踪标准工件与待测工件的对准点,从而实现二者差异性的精准检测,并且在差异性检测的过程中已经保存了采集的条纹数据信息,可以直接在对准处进行即时的三维重建,实验结果验证了所提方法在三维差异性检测中的可行性。
With the improvement of industrial automation,the demand for online real-time measurement of workpieces is growing.It is of great significance to detect the difference between the three-dimensional morphology of the measured workpiece and the standard workpiece,so as to realize the rapid screening of qualified products.The traditional 3D difference detection method usually adopts the reverse fringe technology.It is based on the coordinate correspondence between the camera and the projector,and the stripes projected on the standard workpiece are distributed in a straight line.When the workpiece to be measured is placed at the same position,the difference between the workpiece to be measured and the standard workpiece is directly reflected by the deformation of the straight stripe.In this paper,a real-time computergenerated moire profilometry(CGMP)for workpiece 3D difference detection is proposed.The single frame acquisition characteristics of CGMP are calculated.Only the wrapped phase is calculated and the difference evaluation function model is established.The size of the evaluation function is used to directly reflect the difference characteristics.The alignment position between the standard workpiece and the measured workpiece is tracked through the minimum point of the evaluation function,so as to achieve accurate detection of the difference between the two.The collected fringe data information has been saved in the process of difference detection.The real-time 3D reconstruction can be performed directly at the alignment position.The experimental results verify the feasibility of the proposed method in 3D difference detection.
作者
王林溪
曹益平
WANG Lin-xi;CAO Yi-ping(College of Electronics and Information Engineering,Sichuan University,Chengdu 610065,China)
出处
《光学与光电技术》
2023年第1期13-20,共8页
Optics & Optoelectronic Technology
关键词
计算莫尔轮廓术
实时差异性检测
位置对准
三维重建
实时误差分析
computer-generated moire profilometry
real-time 3D difference detection
position alignment
threedimensional reconstruction
real-time error analysis
