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Guided, Fusion-Based, Large Depth-of-field 3D Imaging Using a Focal Stack.

Yuhao Xiao1, Guijin Wang1, Xiaowei Hu1

  • 1Department of Electronic Engineering, Tsinghua University, Beijing 100084, China.

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|November 10, 2019
PubMed
Summary
This summary is machine-generated.

This study introduces a new structured light 3D imaging method using focal stacks to extend working range. The technique achieves high-quality 3D shape measurement over large depth variations with minimal error.

Keywords:
3D imagingfocal stackguided fusion

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Area of Science:

  • Optics and Photonics
  • Computer Vision and Image Processing

Background:

  • Structured light 3D imaging systems face limitations in working volume due to aperture requirements.
  • Achieving simultaneous focus for both projector and camera restricts depth-of-field in active 3D imaging.

Purpose of the Study:

  • To propose a novel method for extending the working range of structured light 3D imaging systems.
  • To enable high-quality 3D shape measurement in scenes with large depth variations.

Main Methods:

  • Utilized a focal stack approach combined with the gray code method for local 3D shape measurement.
  • Generated a global coarse depth map by extracting texture maps from multiple focal positions.
  • Fused local measurements guided by the coarse depth map for comprehensive scene reconstruction.

Main Results:

  • Developed a prototype system demonstrating high-quality 3D measurements.
  • Achieved a measurement depth range of 400 mm.
  • Reported a low measurement error of 0.08%.

Conclusions:

  • The proposed focal stack method effectively extends the working range of structured light 3D imaging.
  • This technique enables accurate 3D reconstruction in challenging scenes with significant depth variations.
  • The system offers a practical solution for industrial measurements and cultural heritage preservation.