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Related Experiment Videos

Two-dimensional phase-measuring profilometry.

Rui-Hua Zheng1, Yu-Xiao Wang, Xue-Ru Zhang

  • 1Department of Applied Physics, Harbin Institute of Technology, Harbin 150001, China. zrhmxb1234@yahoo.com.cn

Applied Optics
|March 9, 2005
PubMed
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This study introduces an improved method for object contouring using phase-measuring profilometry. The technique enhances phase unwrapping and edge point detection for accurate 3D object reconstruction.

Area of Science:

  • Optical Metrology
  • 3D Reconstruction
  • Computer Vision

Background:

  • Phase-measuring profilometry (PMP) is a key technique for 3D object surface measurement.
  • Traditional PMP methods can face challenges with phase unwrapping and accurate edge detection, especially in shaded regions.
  • Simplifying the optical setup is crucial for practical and convenient application.

Purpose of the Study:

  • To propose an improved method for object contouring using phase-measuring profilometry with a grid grating.
  • To enhance the accuracy of phase unwrapping and the precise identification of object and shaded area boundaries.
  • To facilitate a more convenient and easily arranged measuring system.

Main Methods:

  • Utilizing a grid grating for phase-measuring profilometry.

Related Experiment Videos

  • Employing an adaptive bandpass filter to obtain two phases unwrapped in perpendicular directions.
  • Applying geometric relationships between coordinates and phases for height distribution calculation.
  • Configuring the projector and camera with non-intersecting and non-coplanar main axes.

    • Main Results:

    • Successfully unwrapped phases in perpendicular directions using an adaptive bandpass filter.
    • Accurately appointed edge points for both shaded and object areas.
    • Obtained the height distribution of the object through geometric coordinate-phase relationships.
    • Demonstrated the practical applicability of the developed technique through experimental validation.

    Conclusions:

    • The proposed improved method offers enhanced accuracy in object contouring via phase-measuring profilometry.
    • The technique effectively addresses challenges in phase unwrapping and edge point detection.
    • The simplified, non-coplanar optical setup ensures practical convenience for real-world applications.