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Polarized Light Field Imaging for Single-Shot Reflectance Separation.

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  • 1Imperial College London, London SW7 2AZ, UK. jaewon.kim15@imperial.ac.uk.

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Summary

This study introduces novel computational photography methods for single-shot separation of diffuse and specular light reflections. These techniques enable detailed layered reflectance analysis from a single image, advancing material appearance capture.

Keywords:
light-fieldpolarizationreflectance separationsingle-shot

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Area of Science:

  • Computational Photography
  • Optics
  • Computer Vision

Background:

  • Separating diffuse and specular reflectance is crucial for realistic material rendering.
  • Existing methods often require multiple captures or controlled lighting.
  • Analyzing layered reflectance properties enhances material understanding.

Purpose of the Study:

  • To develop a novel single-shot computational photography technique for separating diffuse/specular reflectance.
  • To introduce angular domain separation for layered reflectance.
  • To enable efficient acquisition of facial reflectance properties.

Main Methods:

  • Two-way polarized light-field (TPLF) imaging captures orthogonal polarization states simultaneously.
  • Four-way polarized light-field (FPLF) imaging generalizes TPLF for uncontrolled illumination.
  • Light-field sampling and polarization analysis are used for reflectance separation.

Main Results:

  • Single-shot separation of diffuse and specular reflectance achieved.
  • Novel angular separation of layered reflectance, including scattering components.
  • Acquisition of diffuse/specular normal maps and layered reflectance normals for faces.
  • Performance comparable to multi-shot techniques under various conditions.

Conclusions:

  • The proposed TPLF and FPLF imaging techniques offer efficient single-shot layered reflectance separation.
  • This approach advances material appearance capture, particularly for facial rendering.
  • The methods are robust under diverse and uncontrolled illumination scenarios.