基于光栅投影的配油盘球面分割及尺寸测量  

Spherical Segmentation and Dimension Measurement of Oil Distribution Plate Based on Fringe Projection

作　　者：雷经发 莫云杰 张淼 李永玲 赵汝海 孙虹 Lei Jingfa;Mo Yunjie;Zhang Miao;Li Yongling;Zhao Ruhai;Sun Hong(School of Mechanical and Electrical Engineering,Anhui Jianzhu University,Hefei 230601,Anhui,China;Key Laboratory of Intelligent Manufacturing of Construction Machinery,Anhui Education Department,Hefei 230601,Anhui,China;Sichuan Provincial Key Laboratory of Process Equipment and Control Engineering,Zigong 643000,Sichuan,China)

机构地区：[1]安徽建筑大学机械与电气工程学院,安徽合肥230601 [2]工程机械智能制造安徽省教育厅重点实验室,安徽合肥230601 [3]过程装备与控制工程四川省高校重点实验室,四川自贡643000

出　　处：《应用激光》2023年第3期100-110,共11页Applied Laser

基　　金：安徽省重点研究与开发计划项目(1804a09020009);安徽省高等学校自然科学研究重点项目(KJ2019A0790);过程装备与控制工程四川省高校重点实验室开放基金项目(GK202101);安徽省教育厅一般项目(KJ2020JD18);安徽建筑大学引进人才及博士启动基金项目(2018QD38)。

摘　　要：配油盘作为液压系统的核心元件之一,其曲面尺寸是否合格直接关系到液压系统的性能。针对其表面部分轮廓特征提取困难、测量误差较大的问题,提出一种基于附加图像边缘检测的球面分割及尺寸测量方法:首先,采用Sobel算子对拍摄的配油盘图像边缘进行锐化并提取球面部分轮廓形成掩膜;然后,借助掩膜分割出球面部分的四步相移图,采用四步相移法求解相位主值,并使用双频外差法展开相位;最后,通过系统标定,计算得到配油盘球面部分的三维点云数据,并进行球面拟合。试验结果表明:采用该方法能够分割出较为清晰的球面部分点云图,基于点云数据拟合的测量精度99.238%,高于依据高度分割、区域生长分割、RANSAC(random sample consensus)分割和手动框选等方法的测量精度,实现了配油盘球面尺寸的高精度测量。As one of the core components of hydraulic system,the surface size of oil distribution plate is directly related to the performance of the hydraulic system.Aiming at the problems of difficulty in extracting partial surface contour features and large measurement error,this paper proposes a spherical segmentation and size measurement method based on additional image edge detection.Firstly,the Sobel operator is adopted to sharpen the edge of the oil distribution plate image,and the contour of the spherical part is extracted to form the mask.Then,the four-step phase shift diagram of the spherical part is segmented by mask,the four-step phase shift method is adopted to solve the phase principal value,and the dual-frequency heterodyne method is adopted to unfold the phase.Finally,the three-dimensional point cloud data of the spherical part of the oil distribution plate is calculated and spherical fitting is carried out through the system calibration.Experimental results show that the spherical partial point cloud image can be segmented clearly by using this method.The measurement accuracy based on point cloud data fitting is 99.238%,which is higher than the measurement accuracy based on height segmentation,RANSAC(Random Sample Consensus)segmentation,region growing segmentation and manual box selection method,and the high-precision measurement of spherical size of oil distribution plate is realized.

关 键 词：轮廓分割 配油盘 球面拟合 光栅投影 尺寸测量 

分 类 号：O438.1[机械工程—光学工程]