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Related Experiment Videos

Generic nonsinusoidal phase error correction for three-dimensional shape measurement using a digital video projector.

Song Zhang1, Shing-Tung Yau

  • 1Department of Mathematics, Harvard University, Cambridge, MA 02138, USA.

Applied Optics
|December 15, 2006
PubMed
Summary
This summary is machine-generated.

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Digital projectors in 3D shape measurement cause errors due to nonlinear gamma. A new look-up table (LUT) method significantly reduces this phase error for all phase-shifting algorithms, improving measurement accuracy.

Area of Science:

  • Optics and Photonics
  • Metrology
  • Computer Vision

Background:

  • Structured light systems utilizing digital video projectors are common for 3D shape measurement.
  • Projector nonlinear gamma introduces nonsinusoidal fringe patterns, leading to phase and measurement errors.
  • Existing look-up table (LUT) methods can reduce these errors for specific algorithms.

Purpose of the Study:

  • To develop a generic and effective method for compensating phase errors caused by projector nonlinear gamma in 3D shape measurement.
  • To propose a novel LUT generation technique based on direct analysis of captured fringe images.

Main Methods:

  • A generalized phase error compensation algorithm using a look-up table (LUT) was proven effective for any phase-shifting algorithm.
  • A new LUT generation method was introduced, analyzing fringe images of a flat board to characterize projector nonlinearity.

Related Experiment Videos

  • Experimental validation of the proposed error compensation algorithm.

    • Main Results:

    • The proposed LUT-based error compensation algorithm significantly reduces phase errors.
    • Phase error was reduced by at least 13 times compared to uncompensated measurements.
    • The algorithm demonstrated effectiveness across various phase-shifting techniques.

    Conclusions:

    • The developed LUT generation method and error compensation algorithm effectively mitigate phase errors in structured light 3D shape measurement.
    • This approach enhances the accuracy and reliability of 3D measurements obtained using digital projectors.
    • The generic nature of the algorithm makes it broadly applicable to diverse phase-shifting 3D reconstruction systems.