Dynamic microscopic 3D shape measurement based on marker-embedded Fourier transform profilometry

Hu Yan; Chen Qian; Zhang Yuzhen; Feng Shijie; Tao Tianyang; Li Hui; Yin Wei; Zuo Chao

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Dynamic microscopic 3D shape measurement based on marker-embedded Fourier transform profilometry

机译：基于标记嵌入式傅里叶变换轮廓测量法的动态微观3D形测量

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In recent years, the fringe projection profilometry (FPP) technique has shown great prospects in the field of dynamic 3D measurement of microscopic surface shape. However, under dynamic conditions, it is desirable to use fewer projected patterns to minimize the sensitivity to motion. The commonly used phase-shifting method needs at least three fringe patterns to retrieve the wrapped phase, which depends heavily on the high-speed hardware to alleviate the effect of motion. Besides, to achieve an unambiguous measurement, at least two wrapped phase maps are required to obtain the absolute phase map, resulting in six pattern projections. In this paper, we propose the marker-embedded Fourier transform profilometry (MEFTP), which extends the modified Fourier transform profilometry with two embedded markers suited to assist the phase-unwrapping process. Combining the embedded markers with temporal phase difference information, the absolute phase can be reliably reconstructed with only two projected patterns. Furthermore, since the phase information is only encoded within a single high-frequency fringe, MEFTP is more suitable for measuring fast-moving or surface-changing objects compared with the phase-shifting method. Experiments on both static and dynamic scenes are performed, verifying that our method can achieve an accurate and robust measurement of a vibrating diaphragm at the speed of 200 frames per second. (C) 2018 Optical Society of America

机译：近年来，条纹投影轮廓测量测量法（FPP）技术在微观表面形状的动态3D测量领域中显示出良好的前景。然而，在动态条件下，希望使用较少的投影模式来最小化运动的灵敏度。常用的相移方法需要至少三个条纹图案来检索包装阶段，这在很大程度上取决于高速硬件以减轻运动的效果。此外，为了实现明确的测量，需要至少两个包装的相位映射来获得绝对相位图，从而产生六个图案投影。在本文中，我们提出了标记嵌入式傅立叶变换轮尺（MEFTP），其扩展了修改的傅立叶变换轮廓测量法，其两个嵌入式标记适合于辅助相位展开过程。将嵌入标记与时间相位差信息组合，可以仅用两个投影模式可靠地重建绝对相位。此外，由于相位信息仅在单个高频边缘内编码，因此与相移方法相比，MEFTP更适合于测量快速移动或表面改变的物体。执行关于静态和动态场景的实验，验证我们的方法可以以每秒200帧的速度达到振动膜片的准确和鲁棒测量。（c）2018年光学学会

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来源
《Applied optics》 |2018年第4期|共9页
作者
Hu Yan; Chen Qian; Zhang Yuzhen; Feng Shijie; Tao Tianyang; Li Hui; Yin Wei; Zuo Chao;
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Nanjing Univ Sci &

Technol Jiangsu Key Lab Spectral Imaging &

Intelligent Se Nanjing 210094 Jiangsu Peoples R China;

Nanjing Univ Sci &

Technol Jiangsu Key Lab Spectral Imaging &

Intelligent Se Nanjing 210094 Jiangsu Peoples R China;

Nanjing Univ Sci &

Technol Jiangsu Key Lab Spectral Imaging &

Intelligent Se Nanjing 210094 Jiangsu Peoples R China;

Nanjing Univ Sci &

Technol Jiangsu Key Lab Spectral Imaging &

Intelligent Se Nanjing 210094 Jiangsu Peoples R China;

Nanjing Univ Sci &

Technol Jiangsu Key Lab Spectral Imaging &

Intelligent Se Nanjing 210094 Jiangsu Peoples R China;

Nanjing Univ Sci &

Technol Jiangsu Key Lab Spectral Imaging &

Intelligent Se Nanjing 210094 Jiangsu Peoples R China;

Nanjing Univ Sci &

Technol Jiangsu Key Lab Spectral Imaging &

Intelligent Se Nanjing 210094 Jiangsu Peoples R China;

Nanjing Univ Sci &

Technol Jiangsu Key Lab Spectral Imaging &

Intelligent Se Nanjing 210094 Jiangsu Peoples R China;

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Dynamic microscopic 3D shape measurement based on marker-embedded Fourier transform profilometry

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