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Profilometry without phase unwrapping using multi-frequency and four-step phase-shift sinusoidal fringe projection.

Eun-Hee Kim1, Joonku Hahn, Hwi Kim

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A novel 3D profilometry technique uses composite fringe projection and geometric analysis for accurate depth mapping. This method effectively measures both continuous and discontinuous objects without phase unwrapping.

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Area of Science:

  • Optics
  • Metrology
  • Computer Vision

Background:

  • 3D profilometry is crucial for dimensional measurements.
  • Traditional methods often struggle with discontinuous surfaces or require phase unwrapping.
  • Accurate depth extraction is essential in various industrial and scientific applications.

Purpose of the Study:

  • To propose a novel 3D profilometry method that overcomes limitations of existing techniques.
  • To enable depth extraction for both continuous and discontinuous objects.
  • To achieve accurate object shape and position identification in an absolute coordinate system.

Main Methods:

  • Utilizing a composite projection of multi-frequency and four-step phase-shift sinusoidal fringes.
  • Employing geometric analysis of the projected fringe patterns.
  • Implementing a phase unwrapping-free approach for depth calculation.

Main Results:

  • Successfully extracted depth information from largely separated discontinuous objects and lumped continuous objects.
  • Demonstrated the capability to identify object shape and position in an absolute coordinate system.
  • Analyzed the depth extraction resolution and presented experimental validation.

Conclusions:

  • The proposed 3D profilometry method offers a robust solution for complex surface measurements.
  • The technique eliminates the need for phase unwrapping, simplifying the measurement process.
  • Geometric analysis of multi-frequency fringe projection is key to accurate 3D reconstruction.