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BRDF invariant stereo using light transport constancy.

Liang Wang1, Ruigang Yang, James E Davis

  • 1Department of Computer Science, University of Louisville, Louisville, KY 40507, USA. lwangd@cs.uky.edu

IEEE Transactions on Pattern Analysis and Machine Intelligence
|July 14, 2007
PubMed
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This study introduces light transport constancy (LTC), a new invariant for stereo reconstruction. LTC enables accurate 3D scene reconstruction with arbitrary material properties (BRDFs) under varying light intensities.

Area of Science:

  • Computer Vision
  • 3D Reconstruction
  • Photometry

Background:

  • Existing stereo reconstruction methods often assume Lambertian reflectance and brightness constancy.
  • These assumptions limit accuracy for non-Lambertian surfaces.

Purpose of the Study:

  • Introduce a novel invariant for stereo reconstruction: light transport constancy (LTC).
  • Enable 3D reconstruction for arbitrary scene reflectance (BRDFs).

Main Methods:

  • Formulate a rank constraint on multiview stereo matching using LTC.
  • Utilize varying lighting intensity configurations with minimal camera setups.

Main Results:

  • Demonstrated LTC's effectiveness with as few as two cameras and two lighting configurations.

Related Experiment Videos

  • Achieved BRDF invariance without precise light source calibration or calibration objects.

    • Conclusions:

    • LTC offers a robust solution for stereo reconstruction with complex materials.
    • The new constraint can enhance existing stereo methods with available lighting variations.