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Related Experiment Videos

Gamma correction for digital fringe projection profilometry.

Hongwei Guo1, Haitao He, Mingyi Chen

  • 1Laboratory of Applied Optics and Metrology, Shanghai University, Shanghai 20072, China. hw-guo@yeah.net

Applied Optics
|May 18, 2004
PubMed
Summary

Digital fringe projection profilometry accuracy is improved by a new gamma-correction technique. This method uses statistical analysis of fringe images to correct projector nonlinearity, enhancing measurement resolution and accuracy without device calibration.

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Area of Science:

  • Optics and Photonics
  • Metrology
  • Computer Vision

Background:

  • Digital fringe projection profilometry offers flexible 3D surface measurement.
  • Projector gamma nonlinearity limits measurement accuracy and resolution.
  • Existing methods often require photometric calibration or device-specific knowledge.

Purpose of the Study:

  • To develop a gamma-correction technique for digital fringe projection profilometry.
  • To improve measurement accuracy and resolution by addressing projector nonlinearity.
  • To provide a calibration-free method for gamma correction.

Main Methods:

  • Statistical analysis of fringe images.
  • Normalized cumulative histogram for gamma value estimation.
  • Iterative gamma estimation and phase evaluation.

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Main Results:

  • Accurate estimation of projector gamma values.
  • Significantly improved phase distribution accuracy.
  • Successful demonstration via computer simulation and experimental validation.

Conclusions:

  • The proposed technique effectively corrects for gamma nonlinearity in fringe projection profilometry.
  • This method enhances measurement accuracy and resolution without requiring photometric calibration.
  • The approach is validated through simulations and experiments, proving its practical utility.