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机器视觉系统前置矩形LED阵列的优化布置

Optimal Positioning of Forward Installed Square LED Arrays for Machine Vision System

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摘要

为获得均匀光照,提高视觉测量系统图像的品质,对前置对称安装的矩形发光二极管(LED)光源布置问题进行了研究。考虑到解析法要求光轴与辐照面法线平行,提出采用优化的方法布置光源。根据光源的结构特征,以方差作为主要指标,建立优化目标函数。考虑到目标函数的非凸性,采用模拟退火算法(SA)对问题进行求解。搭建实验平台对照度分布进行了测量,考察均匀度在95%以上的区域,优化方法的结果与实验结果基本一致,误差在4%以内。结果表明,确定的优化目标合理,提出的光源优化布置方法有效。

Abstract

Positioning of forward symmetrically installed square light-emitting diode (LED) arrays are studied to achieve uniform illumination with which high quality images can be gathered for machine vision measurement. The optimization method is used to solve this problem because the optical axes of the arrays are not perpendicular to the irradiated plane, which can′t be solved by analytic method. The variance is chosen to establish the mathematical model of goal function on the base of the structure characteristics of LEDs. The simulated annealing (SA) algorithm is chosen for solving the non-convex objective function. An experiment system is developed for illumination photometry. The sizes of area with 95% of uniformity of the analytic method are a little larger than those of the optimization based method. The maximum difference is within 4%. The results show that the optimization objective is reasonable and the method is feasible.

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中图分类号:TB811.+1

DOI:10.3788/aos201434.1215001

所属栏目:机器视觉

基金项目:国家自然基金青年基金(51305194,51205182)、江苏省六大人才高峰重点项目(2012-ZBZZ-049)、江苏省高校自然基金(14KJD46001)

收稿日期:2014-06-17

修改稿日期:2014-07-05

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作者单位    点击查看

郝飞:东南大学机械工程学院, 江苏 南京 211189南京工程学院轨道车辆现代化装备实验室, 江苏 南京 211167
史金飞:东南大学机械工程学院, 江苏 南京 211189
朱松青:南京工程学院轨道车辆现代化装备实验室, 江苏 南京 211167
张志胜:东南大学机械工程学院, 江苏 南京 211189
韩亚丽:南京工程学院轨道车辆现代化装备实验室, 江苏 南京 211167
陈茹雯:南京工程学院轨道车辆现代化装备实验室, 江苏 南京 211167

联系人作者:郝飞(hf_1982@njit.edu.cn)

备注:郝飞(1982—),男,博士研究生,主要从事机器视觉测量方面的研究。

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