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Lightdrum-Portable Light Stage for Accurate BTF Measurement on Site.

Vlastimil Havran1, Jan Hošek2, Šárka Němcová3

  • 1Faculty of Electrical Engineering, Czech Technical University, Karlovo nám. 13, 121 35 Praha 2, Czech Republic. havran@fel.cvut.cz.

Sensors (Basel, Switzerland)
|March 1, 2017
PubMed
Summary

We developed a portable light stage to measure surface Bidirectional Reflectance Distribution Function (BRDF) and Bidirectional Texture Function (BTF) accurately and quickly in real-world settings. This device enables efficient on-site material analysis for various applications.

Keywords:
bidirectional texture functionsurface reflectancesurface reflectance measurement

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Area of Science:

  • Computer Vision
  • Optics
  • Materials Science

Background:

  • Accurate surface appearance measurement is crucial for realistic rendering and material analysis.
  • Existing Bidirectional Texture Function (BTF) acquisition systems are often large, stationary, and not suitable for on-site measurements.

Purpose of the Study:

  • To propose and validate a miniaturized, portable light stage for on-site Bidirectional Reflectance Distribution Function (BRDF) and BTF measurements.
  • To achieve a balance between measurement accuracy, speed, and practical applicability in real-world scenarios.

Main Methods:

  • Designed a compact hemispherical gantry with fixed Light Emitting Diode (LED) modules and movable cameras.
  • Utilized camera rotation and zenith angle adjustments (0-75°) to capture comprehensive directional lighting and viewing data.
  • Employed an auto-collimator for precise perpendicular alignment and a marker sticker method for image rectification and alignment.

Main Results:

  • The miniaturized light stage demonstrated high-speed and accurate BTF/BRDF measurements comparable to stationary systems.
  • Successfully acquired and processed data for 36 material samples, enabling realistic rendering.
  • The system offers a practical tradeoff between measurement degrees of freedom and applicability.

Conclusions:

  • The proposed portable light stage effectively enables on-site BTF and BRDF acquisition.
  • This technology facilitates accurate material appearance analysis in diverse real-world applications.
  • The device offers a practical solution for capturing complex surface properties outside of laboratory environments.