微装配中变焦变倍视觉系统标定及自动聚焦  被引量:2

Calibration and automatic focusing of zoom vision system for microassembly

在线阅读下载全文

作  者:任同群[1,2] 黄海亭 王晓东[1,2] 刘钰 Ren Tongqun;Huang Haiting;Wang Xiaodong;Liu Yu(Key Laboratory for Precision&Non-traditional Machining of the Ministry of Education,Dalian University of Technology,Dalian 116024,China;Key Laboratory for Micro/Nano Technology and System of Liaoning Province,Dalian University of Technology,Dalian 116024,China)

机构地区:[1]大连理工大学精密与特种加工教育部重点实验室,辽宁大连116024 [2]大连理工大学辽宁省微纳米技术及系统重点实验室,辽宁大连116024

出  处:《红外与激光工程》2018年第11期193-202,共10页Infrared and Laser Engineering

基  金:国家创新群体基金(51621064);国家部委基础预研重大项目(JCYK2016205A003);中央高校基本科研业务费专项资金(DUT16TD20)

摘  要:在微装配中,采用变焦变倍视觉系统可以有效解决测量范围与精度的矛盾,但同时也引入了动态标定和实时自动聚焦的新问题。为此,对变焦变倍显微视觉系统的标定和自动聚焦技术展开研究。在标定方面,首先通过变倍率法完成图像主点的标定。基于平面靶标定法,采用单视图单应矩阵分解对固定倍率下相机内外参数进行线性标定,再引入畸变模型,并由量子行为粒子群优化算法对标定结果进行非线性优化,优化之后的最大反投影误差约为0.13 pixel,平均反投影误差约为0.1 pixel。此外,通过高斯曲线拟合完成对任意工作状态下视觉系统放大倍数的校准。在自动聚焦方面,针对传统灰度梯度函数只考虑固定梯度方向且易受噪声影响的问题,采用八邻域最大梯度阈值的自动调焦算法,通过梯度阈值提高算法的抗噪性。与其他几种灰度梯度调焦函数相比,该算法的单峰性好,抗噪性强。In microassembly,zoom vision system was usually used to solve the contradiction between measuring scope and accuracy.However,new problems of dynamic calibration and real-time automatic focusing were also introduced as a side-effect.For this reason,the calibration and automatic focusing technology of zoom micro-vision system were described.For calibration,the principal point of image was determined by method of convertible magnification.Based on planar target,the linear calibration under fixed magnification was firstly performed by homography matrix decomposition of single view.Then the distortion model and the quantum-behaved particle swarm optimization(QPSO)were employed sequentially to do nonlinear optimization for the linear calibration result.After nonlinear optimization,the maximum re-projection error was 0.13 pixel and the average re-projection error was about 0.1 pixel.Furthermore,the calibration for magnification at arbitrary working condition was completed by Gaussian curve fitting.For real-time automatic focusing,method of maximum gradient threshold of eight-neighborhood and gradient threshold were used,for the traditional gray gradient function only considered the fixed gradient direction and was susceptible to noise.Compared with other several gray gradient focusing function,this method had good unimodality and noise immunity.

关 键 词:变焦变倍显微视觉系统 标定 量子行为粒子群优化 自动调焦 

分 类 号:TP391[自动化与计算机技术—计算机应用技术] TP272[自动化与计算机技术—计算机科学与技术]

 

参考文献:

正在载入数据...

 

二级参考文献:

正在载入数据...

 

耦合文献:

正在载入数据...

 

引证文献:

正在载入数据...

 

二级引证文献:

正在载入数据...

 

同被引文献:

正在载入数据...

 

相关期刊文献:

正在载入数据...

相关的主题
相关的作者对象
相关的机构对象