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随机相移阴影莫尔法研究

Research on Random Phase Shifting Shadow Moiré Technique

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摘要

相移阴影莫尔是一项成熟的物体表面三维轮廓测量技术,但是该技术的性能还有优化的空间。为了提高阴影莫尔技术的精度且不增加装置的复杂性,提出了一种随机相移阴影莫尔三维轮廓测量技术。所提方法采用立体视觉方法对阴影莫尔装置结构参数进行标定,运用3帧随机相移算法提取测量相位,从而极大地简化了现有阴影莫尔技术的测量过程。由于是基于随机相移思想,假定相邻帧条纹图间引入的相移不等且未知,因此所提方法可有效地降低相移器的应用要求。另外,所提方法在相位解调过程中不受背景光影响,且对条纹图非正弦光强分布不敏感,具有精度高、应用容易的特点。实验表明,所提方法精度高,速度快,优于现有的典型算法。

Abstract

The phase shifting shadow moiré is an efficient technique for three-dimensional (3D)object surface measurement, of which the performance can be improved further. This paper focuses on improving its measurement accuracy without adding the complication of the experimental set-up. An effective method, based on the idea of random phase shifting, is proposed. In the method, the parameters of shadow moiré system are calibrated by stereo vision technique and the phase of the fringe pattern is extracted by three-frame random phase shifting algorithm. We assume that the introduced phase shifting is unequal and unknown, so the stringent requirements for the shifter are relaxed. The proposed method can lower the application requirement of shadow moiré. Besides, the proposed method is not affected by the background light in the phase demodulation process, and is insensitive to the non-sinusoidal light intensity distribution of the fringe pattern, and has the advantages of high accuracy and easy application. Experiments show that the proposed method has high accuracy and high speed and is superior to the existing typical algorithms.

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中图分类号:O439

DOI:10.3788/aos201838.0815010

所属栏目:“机器视觉检测与应用”专题

基金项目:国家自然科学基金(61471288,51505361)、陕西省教育厅重点实验室基金(17JS059)

收稿日期:2018-02-05

修改稿日期:2018-03-01

网络出版日期:2018-03-19

作者单位    点击查看

杜虎兵:西安工业大学机电工程学院, 陕西 西安 710021
张少锋:西安工业大学机电工程学院, 陕西 西安 710021
宇建红:西安工业大学机电工程学院, 陕西 西安 710021
李军宁:西安工业大学机电工程学院, 陕西 西安 710021

联系人作者:杜虎兵(duhubing@xatu.edu.cn)

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引用该论文

Du Hubing,Zhang Shaofeng,Yu Jianhong,Li Junning. Research on Random Phase Shifting Shadow Moiré Technique[J]. Acta Optica Sinica, 2018, 38(8): 0815010

杜虎兵,张少锋,宇建红,李军宁. 随机相移阴影莫尔法研究[J]. 光学学报, 2018, 38(8): 0815010

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