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面向金属材质表面反光特性的结构光三维测量技术 - 中国知网

文章目录

记笔记

面向金属材质表面反光特性的结构光三维测量技术

李兆杰

南京航空航天大学

摘要：金属作为目前工业领域中应用最为广泛的一种材料,对其表面的三维测量一直是研究的重点和难点。结构光测量技术以其简单、高速、准确的特性被视为未来三维测量发展的重要研究方向,其在面向各种金属材质的工件测量中有广阔的应用前景。在视觉测量过程中,金属表面的高反射特性导致外界光强超出相机动态范围以致出现过曝光现象,对测量造成了困难。本文在对单目结构光测量系统的数学模型、标定过程、相位展开技术研究的基础上,对金属表面的反光特性和反射模型进行了分析,并对面向金属反光表面三维测量方法进行了深入的研究。主要研究内容如下:（1）对单目结构光测量系统的测量原理、模型构建、标定过程进行了研究,详细分析了相机成像原理和过程、相位提取技术。（2）研究了金属表面反光特性,结合相机感光模型及成像原理、物体表面反射模型分析了金属表面易发生反光现象的原因。（3）提出了一种相机自动多曝光的形貌测量算法,相机响应曲线反映了像素灰度值与相机曝光量之间的映射关系,算法根据计算出的相机响应曲线获得场景照度值范围,最后通过对照度值的划分得到多个曝光时间。（4）研究了面向金属反光表面的三维测量方法,针对其结构复杂、曲率变化大、光反射率高的特点,建立了一种多视角多曝光结合的测量系统;针对部分金属表面反射形式接近于漫反射的情况,提出了一种单次自动曝光算法;针对金属零件尺寸偏大的特点,采用一种面向多场景测量的自动曝光测量算法以提高测量效率。（5）搭建测量系统,应用本文所提算法对金属表面进行了测量实验,实验结果表明该算法能够实现对高光表面的三维测量,且精度较高,体现了算法的有效性。

关键词：

金属; 反光表面; 结构光; 自动曝光; 相机响应函数;

基金资助：

“国家高档数控机床与基础制造装备—中小型飞机机身大部件复合加工机床项目（2014ZX04001071）”；

专辑：
工程科技Ⅰ辑; 信息科技
专题：
金属学及金属工艺; 计算机软件及计算机应用
DOI：
10.27239/d.cnki.gnhhu.2019.000798
分类号：
TG806;TP391.41

导师：

刘长毅; 殷黎明;

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文章目录

面向金属材质表面反光特性的结构光三维测量技术

李兆杰

南京航空航天大学

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