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Multifrequency grating projection profilometry based on the nonlinear excess fraction method.

Y Hao1, Y Zhao, D Li

  • 1Department of Precision Instruments, State Key Laboratory of Precision Measurement Technology and Instruments, Tsinghua University, Beijing 100084, China. haoyd@263.net

Applied Optics
|March 8, 2008
PubMed
Summary
This summary is machine-generated.

This study introduces a nonlinear excess fraction method (NLEFM) for robust phase unwrapping in 3D shape measurement. NLEFM significantly extends the reliable measuring range of grating projection profilometry without sacrificing accuracy.

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Area of Science:

  • Optical Metrology
  • 3D Imaging and Reconstruction
  • Computational Imaging

Background:

  • Grating projection profilometry is a key technique for 3D shape measurement.
  • Phase unwrapping remains a significant challenge, limiting measurement accuracy and range.
  • Existing methods struggle with complex surfaces and large depth variations.

Purpose of the Study:

  • To develop a robust phase unwrapping method for grating projection profilometry.
  • To extend the reliable measuring range of 3D shape measurement systems.
  • To improve the accuracy and applicability of profilometry for complex object analysis.

Main Methods:

  • Introduction of the conventional excess fraction method into the nonlinear domain.
  • Development of a nonlinear excess fraction method (NLEFM).
  • Implementation of a multifrequency grating projection profilometry system based on NLEFM.

Main Results:

  • NLEFM demonstrates robust temporal phase unwrapping capabilities.
  • The reliable measuring range is extended by dozens of times.
  • Complex 3D profiles are reliably measured with the novel system.
  • Accuracy is maintained despite the extended measurement range.

Conclusions:

  • NLEFM offers a significant advancement in phase unwrapping for 3D profilometry.
  • The developed multifrequency system provides extended and accurate 3D shape measurement.
  • This technique has broad potential for applications requiring precise 3D reconstruction of complex objects.