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Related Experiment Videos

Absolute phase measurements using geometric constraints between multiple cameras and projectors.

Rui Ishiyama1, Shizuo Sakamoto, Johji Tajima

  • 1Graduate School of Information Sciences, Tohoku University, Aramaki-Aza Aoba, Aoba-Ku, Sendai, Japan. r-ishiyama@bl.jp.nec.com

Applied Optics
|May 22, 2007
PubMed
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This study introduces novel methods for precise 3D measurement using phase shift techniques. These advancements overcome limitations in absolute phase determination and phase unwrapping for complex surfaces, improving 3D scanning accuracy.

Area of Science:

  • Optical Metrology
  • Computer Vision
  • 3D Imaging

Background:

  • Phase shift profilometry enables accurate, dense, and fast 3D measurements.
  • Wrapped phase values introduce ambiguities, complicating absolute phase determination.
  • Conventional methods struggle with abrupt depth variations and require extra patterns.

Purpose of the Study:

  • To develop methods for absolute phase determination without additional patterns.
  • To enhance the robustness of phase unwrapping for surfaces with rapid depth changes.
  • To improve the accuracy and efficiency of 3D scanning.

Main Methods:

  • Utilizing multiple cameras to observe projected patterns and geometric constraints for absolute phase determination.
  • Employing continuities in relative phases across multiple projected patterns to prevent unwrapping failures.

Related Experiment Videos

  • Implementing these methods in a novel 3D scanner.

    • Main Results:

    • Achieved absolute phase determination without extra projected patterns.
    • Successfully prevented phase unwrapping failures in areas with abrupt depth variations.
    • Demonstrated high-accuracy 3D measurement (0.14 mm depth accuracy).

    Conclusions:

    • The proposed methods significantly improve phase shift-based 3D measurement.
    • The developed 3D scanner offers a wide field of view (180 degrees) and rapid measurement (0.5 s).
    • This technique provides a robust solution for accurate 3D reconstruction of complex scenes.