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Lensfree On-chip Tomographic Microscopy Employing Multi-angle Illumination and Pixel Super-resolution

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Baseline-free structured light 3D imaging using a metasurface double-helix dot projector.

Zicheng Shen¹, Yibo Ni¹, Yuanmu Yang¹

¹State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instrument, Tsinghua University, Beijing 100084, China.

Nanophotonics (Berlin, Germany)

|April 28, 2025

Summary

This summary is machine-generated.

This study introduces a novel baseline-free structured light 3D imaging system. It overcomes limitations of existing methods for accurate 3D point cloud acquisition in diverse scenarios.

Keywords:

baseline-free metasurface double-helix dot projector structured light 3D imaging

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Area of Science:

Optics and Photonics
Computer Vision
Metrology

Background:

Structured light 3D imaging often requires long baseline lengths, limiting its use in confined spaces.
Passive 3D imaging methods struggle with textureless scenes.
Existing 3D imaging techniques have limitations in space constraints and scene texture.

Purpose of the Study:

To develop a baseline-free structured light 3D imaging system.
To combine the strengths of structured light and depth-dependent point spread functions (PSFs).
To enable accurate 3D imaging in space-constrained and textureless environments.

Main Methods:

A metasurface was designed to project a structured dot array.
Depth information is encoded within the double-helix pattern of each projected dot.
A fast algorithm was employed for 3D point cloud acquisition.

Main Results:

Demonstrated accurate 3D point cloud acquisition using the proposed system.
Successfully imaged real-world scenarios, including multiple cardboard boxes and a human face.
The system effectively encodes depth information via a metasurface-generated pattern.

Conclusions:

The developed baseline-free structured light system integrates advantages of existing methods.
This technique offers accurate 3D imaging without long baseline requirements.
Potential applications include consumer electronics and precision metrology.