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Time and frequency -Domain Interpretation of Phase-lead Control01:24

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Period coded phase shifting strategy for real-time 3-D structured light illumination.

Yongchang Wang1, Kai Liu, Qi Hao

  • 1Department of Electrical Engineering, University of Kentucky, Lexington, KY 40507, USA. ywang6@engr.uky.edu

IEEE Transactions on Image Processing : a Publication of the IEEE Signal Processing Society
|May 25, 2011
PubMed
Summary
This summary is machine-generated.

This study introduces a new method for phase shifting structured light illumination, enhancing range sensing accuracy. The technique embeds a period cue to resolve phase ambiguities, enabling high-precision 3D measurements in real-time.

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Area of Science:

  • Computer Vision
  • Optical Metrology
  • 3D Imaging

Background:

  • Phase shifting structured light is crucial for range sensing.
  • High pattern frequencies in structured light can cause phase unwrapping ambiguities.
  • Current methods may require more patterns or compromise signal quality.

Purpose of the Study:

  • To propose a novel method for embedding a period cue into structured light patterns.
  • To improve phase unwrapping accuracy and measurement precision in range sensing.
  • To enable high-frequency phase unwrapping without increasing pattern count.

Main Methods:

  • Developing a structured light projection technique that incorporates a period cue.
  • Utilizing phase shifting principles with enhanced pattern design.
  • Theoretical analysis and experimental validation with a prototype system.

Main Results:

  • Successfully embedded a period cue into projected patterns without signal-to-noise ratio reduction.
  • Achieved unambiguous high-frequency phase unwrapping.
  • Demonstrated high measurement precision at 120 fps with 640x480 resolution.

Conclusions:

  • The proposed method effectively resolves phase ambiguities in structured light range sensing.
  • It enables high-precision 3D measurements and real-time applications.
  • This technique offers a significant advancement over existing methods.