Three-dimensional (3D) information is vital for providing detailed features of the physical world, which is used in numerous applications such as industrial inspection, automatic navigation and identity authentication. However, the implementations of 3D imagers always rely on bulky optics. Metasurfaces, as the next-generation optics, shows flexible modulation abilities and excellent performance combined with computer vision algorithm. Here, we demonstrate an active 3D positioning and imaging method with large field of view (FOV) by single fringe projection based on metasurface and solve the accurate and robust calibration problem with the depth uncertainty of 4 μm. With a compact metasurface projector, the demonstrated method can achieve submillimeter positioning accuracy under the FOV of 88°, offering robust and fast 3D reconstruction of the texture-less scene due to the modulation characteristic of the fringe. Such scheme may accelerate prosperous engineering applications with the continued growth of flat-optics manufacturing process by using metadevices.

中文翻译：

---

具有紧凑型超表面设备的单条纹投影调制的主动 3D 定位和成像

三维 (3D) 信息对于提供物理世界的详细特征至关重要，可用于工业检测、自动导航和身份验证等众多应用。然而，3D 成像器的实现始终依赖于笨重的光学器件。超表面作为下一代光学器件，结合计算机视觉算法，展现出灵活的调制能力和优异的性能。在这里，我们通过基于超表面的单条纹投影展示了一种具有大视场 (FOV) 的主动 3D 定位和成像方法，并解决了 4 μm 深度不确定性的精确和鲁棒校准问题。使用紧凑型超曲面投影仪，所演示的方法可以在 88° 的 FOV 下实现亚毫米级定位精度，由于边缘的调制特性，提供无纹理场景的稳健且快速的 3D 重建。随着平面光学制造工艺的持续增长，这种方案可以通过使用元器件加速繁荣的工程应用。