High-precision real-time 3D shape measurement using a bi-frequency scheme and multi-view system

Tao Tianyang; Chen Qian; Feng Shijie; Hu Yan; Da Jian; Zuo Chao

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High-precision real-time 3D shape measurement using a bi-frequency scheme and multi-view system

机译：高精度实时3D形状测量使用双频方案和多视图系统

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High-speed and high-precision 3D shape measurement plays a central role in diverse applications such as automatic online inspection, robotics control, and human-computer interaction. Conventional multi-frame phase-shifting-based fringe projection profilometry techniques face inherent trade-offs between the speed and measurement precision, which are fundamentally limited by the fringe density and extra pattern projections used for de-ambiguity of fringe orders. Increasing the frequency of the projection fringes can obviously improve the measurement precision; however, it creates difficulties in the subsequent phase unwrapping. For this reason, to date, the frequency of the fringes in typical real-time 3D shape measurement techniques is generally less than 30 to guarantee a reasonable reliability of phase unwrapping. To overcome this limitation, a bi-frequency phaseshifting technique based on a multi-view fringe projection system is proposed, which significantly enhances the measurement precision without compromising the measurement speed. Based on the geometric constraints in a multi-view system, the unwrapped phase of the low-frequency (10-period) fringes can be obtained directly, which serves as a reference to unwrap the high-frequency phase map with a total number of periods of up to 160. Besides, the proposed scheme with 10-period and 160-period fringes is suitable for slightly defocusing projection, allowing a higher projection rate and measurement speed. Experiments on both static and dynamic scenes are performed, verifying that our method can achieve high-speed and high-precision 3D measurement at 300 frames per second with a precision of about 50 mu m. (C) 2017 Optical Society of America

机译：高速和高精度3D形状测量在各种应用中起着核心作用，如自动在线检查，机器人控制和人机交互。常规的基于多帧移相的条纹投影轮廓测压技术在速度和测量精度之间面临固有的折磨，其基本上受到边缘顺序的脱模的条纹密度和额外图案突起的基本限制。增加投影边缘的频率明显提高测量精度;但是，它在随后的相位展开中产生了困难。因此，迄今为止，典型的实时3D形状测量技术中的条纹的频率通常小于30，以保证相位展开的合理可靠性。为了克服这种限制，提出了一种基于多视图边缘投影系统的双频相位化技术，这显着增强了测量精度而不损害测量速度。基于多视图系统中的几何约束，可以直接获得低频（10周期）条纹的未包装阶段，其用作未包装的高频相位映射的引用除此之外，还有10周期和160周期条纹的提出方案适用于略微散焦投影，允许更高的投影率和测量速度。执行关于静态和动态场景的实验，验证我们的方法可以在每秒300帧中实现高速和高精度的3D测量，精度约为50μm。（c）2017年光学学会

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来源
《Applied optics》 |2017年第13期|共8页
作者
Tao Tianyang; Chen Qian; Feng Shijie; Hu Yan; Da Jian; Zuo Chao;
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Nanjing Univ Sci &

Technol Smart Computat Imaging SCI Lab 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 Smart Computat Imaging SCI Lab Nanjing 210094 Jiangsu Peoples R China;

Nanjing Univ Sci &

Technol Smart Computat Imaging SCI Lab Nanjing 210094 Jiangsu Peoples R China;

Nanjing Univ Sci &

Technol Smart Computat Imaging SCI Lab Nanjing 210094 Jiangsu Peoples R China;

Nanjing Univ Sci &

Technol Smart Computat Imaging SCI Lab Nanjing 210094 Jiangsu Peoples R China;

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正文语种 eng
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High-precision real-time 3D shape measurement using a bi-frequency scheme and multi-view system

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