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首页> 外文期刊>Optical engineering >Phase error elimination considering gamma nonlinearity, system vibration, and noise for fringe projection profilometry
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Phase error elimination considering gamma nonlinearity, system vibration, and noise for fringe projection profilometry

机译：考虑到伽马非线性，系统振动和条纹投影轮廓仪噪声的相位误差消除

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摘要

Fringe projection profilometry (FPP) using a digital video projector is widely used for three-dimensional shape measurement. However, the gamma nonlinearity, system vibration, and noise cause the captured fringe patterns to be nonsinusoidal waveforms and have a grayscale deflection from their true value. This leads to an additional phase measurement error for a general phase-shifting algorithm. Based on the theoretical analysis, we propose a method to eliminate the phase error considering two factors. In this method, four-step phase-shifting is done four times with an initial phase offset of 22.5 deg and the average of these four phase maps precisely results in the real phase. As a result, phase error caused by gamma nonlinearity can be effectively suppressed. In addition, every image in phase shifting is replaced by the average of 20 fringe images continuously captured at the same state to avoid the phase error caused by system vibration and noise. Experimental results show that this method is effective in eliminating the phase error in practical phase-shifting FPP. In general, more than 90% of the phase error can be reduced.
机译：使用数字视频投影仪的边缘投影轮廓仪（FPP）被广泛用于三维形状测量。但是，伽马非线性，系统振动和噪声会导致捕获的条纹图案为非正弦波形，并且灰度值会偏离其真实值。对于一般的相移算法，这导致附加的相位测量误差。在理论分析的基础上，提出了一种考虑两个因素的相位误差消除方法。在这种方法中，四步相移完成了四次，初始相位偏移为22.5度，这四个相图的平均值精确地产生了实相。结果，可以有效地抑制由伽马非线性引起的相位误差。此外，相移中的每个图像均被在相同状态下连续捕获的20个条纹图像的平均值所取代，以避免系统振动和噪声引起的相位误差。实验结果表明，该方法可有效消除实际相移FPP中的相位误差。通常，可以减少90％以上的相位误差。

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  • 来源
    《Optical engineering》 |2014年第9期|094102.1-094102.7|共7页
  • 作者

    Jun Yao; Chen Xiong; Yihao Zhou; Hong Miao; Jubing Chen;

  • 作者单位

    Shanghai Jiao Tong University, Department of Engineering Mechanics, Shanghai 200240, China;

    University of Science and Technology of China, Department of Mechanics and Mechanical Engineering, Hefei 230027, China;

    Shanghai Jiao Tong University, Department of Engineering Mechanics, Shanghai 200240, China;

    University of Science and Technology of China, Department of Mechanics and Mechanical Engineering, Hefei 230027, China;

    Shanghai Jiao Tong University, Department of Engineering Mechanics, Shanghai 200240, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    phase shifting; phase error elimination; gamma nonlinearity; system vibration and noise;

    机译：相移消除相位误差;伽玛非线性系统振动和噪音;

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