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机器视觉中均匀照明成像的LED环形阵列设计

LED Ring Array Design for Uniform Illumination Imaging in Machine Vision

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摘要

提出一种用于机器视觉的能获得高质量图像的发光二极管(LED)环形阵列结构的优化照明设计方法。所提方法由成像理论和Taguchi方法组成,以获得均匀的照明分布。根据成像理论,推导出图像对比度与照度均匀度之间的关系。在此基础上,获得了影响照度分布的主要参数,并在直交表中设计模拟实验的参数组合,利用TracePro软件进行仿真模拟。然后,得到各参数对均匀性的最佳参数组合和影响程度,在模拟实验中优化后的参数组合的照度均匀度达89.31%。最后,设计了一种性能良好的机器视觉光源,相关实验证明,该灯具可以满足机器视觉的光照需求,均匀度可达80.35%。所提方法可有效解决关于机器视觉的光学设计问题。

Abstract

This paper proposes an optimized lighting design method of light-emitting diode (LED) ring array structure for machine vision, which can obtain high-quality images. The proposed method consists of imaging theory and Taguchi method to obtain uniform illumination distribution. The relationship between image contrast and illumination uniformity is derived based on the imaging theory. Furthermore, the main parameters of illumination distribution are acquired, and simulation experiments are designed in a direct intersection table and simulated using TracePro software. Then, the best parameter combination and influence degree of each parameter on uniformity are obtained; the illumination uniformity of the optimized parameter combination is up to 89.31% in the simulation experiments. Finally, a kind of machine vision light source with excellent performance is designed. Relevant experiments show that the lamp can meet the lighting requirements of machine vision (uniformity is 80.35%). The proposed method is an effective strategy to deal with optical design for machine vision.

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中图分类号:TB858.1, TN312.8

DOI:10.3788/AOS202040.2011003

所属栏目:成像系统

基金项目:宁波市科技创新2025重大专项;

收稿日期:2020-06-02

修改稿日期:2020-07-10

网络出版日期:2020-10-01

作者单位    点击查看

史晨阳:复旦大学信息科学与工程学院电光源研究所, 上海 200433
林燕丹:复旦大学信息科学与工程学院电光源研究所, 上海 200433复旦大学工程与应用技术研究院, 上海 200433

联系人作者:林燕丹(ydlin@fudan.edu.cn)

备注:宁波市科技创新2025重大专项;

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引用该论文

Shi Chenyang,Lin Yandan. LED Ring Array Design for Uniform Illumination Imaging in Machine Vision[J]. Acta Optica Sinica, 2020, 40(20): 2011003

史晨阳,林燕丹. 机器视觉中均匀照明成像的LED环形阵列设计[J]. 光学学报, 2020, 40(20): 2011003

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