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Related Experiment Video

Updated: Dec 16, 2025

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Absolute phase measurement with four patterns based on variant shifting phases.

Bolin Cai1, Lei Zhang1, Jun Wu2

  • 1Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei 230026, China.

The Review of Scientific Instruments
|July 3, 2020
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Summary
This summary is machine-generated.

This study introduces a robust coding method for fringe projection profilometry, improving absolute phase measurement accuracy. The new technique uses unique codes and error correction for reliable 3D shape reconstruction.

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Area of Science:

  • Optics and Photonics
  • Metrology and Measurement Science

Background:

  • Fringe projection profilometry is a key technique for 3D object shape measurement.
  • Accurate absolute phase retrieval remains a significant challenge in fringe projection systems.

Purpose of the Study:

  • To present a robust coding method for enhanced absolute phase measurement in fringe projection profilometry.
  • To overcome limitations of existing variant shifting phase methods regarding phase errors and codeword quantity.

Main Methods:

  • A novel robust coding method embedding a specific code sequence into the shifting phase.
  • Generation of over 36 periods using unique three-adjacent-codes for fringe order determination.
  • Implementation of an error correction algorithm to optimize codewords.

Main Results:

  • Experimental verification demonstrates the proposed method's robustness and efficiency.
  • Successful determination of fringe order using combined adjacent codes.
  • Mitigation of phase errors associated with a large number of codewords.

Conclusions:

  • The proposed robust coding method significantly improves absolute phase accuracy in fringe projection profilometry.
  • This technique offers a reliable solution for 3D shape measurement challenges.
  • The method is efficient and suitable for practical applications.