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Sensors 2018, 18(11), 3803;

Polarized Light Field Imaging for Single-Shot Reflectance Separation

Imperial College London, London SW7 2AZ, UK
This paper is an extended version of “Single-shot Layered Reflectance Separation Using a Polarized Light Field Camera”, written by Jaewon Kim, Shahram Izadi and Abhijeet Ghosh, published in the Proceedings of the 2016 Eurographics Symposium on Rendering: Experimental Ideas & Implementations (EGSR’16), Dublin, Ireland, 22–24 June 2016.
Author to whom correspondence should be addressed.
Received: 9 August 2018 / Revised: 11 October 2018 / Accepted: 26 October 2018 / Published: 6 November 2018
(This article belongs to the Special Issue Snapshot Multi-Band Spectral and Polarization Imaging Systems)
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We present a novel computational photography technique for single-shot separation of diffuse/specular reflectance, as well as novel angular domain separation of layered reflectance. We present two imaging solutions for this purpose: two-way polarized light-field (TPLF) imaging and four-way polarized light-field (FPLF) imaging. TPLF imaging consists of a polarized light-field camera, which simultaneously captures two orthogonal states of polarization. A single photograph of a subject acquired with the TPLF camera under polarized illumination then enables standard separation of diffuse (depolarizing) and polarization preserving specular reflectance using light-field sampling. We further demonstrate that the acquired data also enable novel angular separation of layered reflectance including separation of specular reflectance and single scattering in the polarization preserving component, as well as separation of shallow scattering from deep scattering in the depolarizing component. FPLF imaging further generalized the functionality of TPLF imaging under uncontrolled unpolarized or partially polarized illumination such as outdoors. We apply our approach for efficient acquisition of facial reflectance including diffuse and specular normal maps and novel separation of photometric normals into layered reflectance normals for layered facial renderings. We validate our proposed single-shot layered reflectance separation under various imaging conditions and demonstrate it to be comparable to an existing multi-shot technique that relies on structured lighting while achieving separation results under a variety of illumination conditions. View Full-Text
Keywords: light-field; polarization; reflectance separation; single-shot light-field; polarization; reflectance separation; single-shot

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Kim, J.; Ghosh, A. Polarized Light Field Imaging for Single-Shot Reflectance Separation. Sensors 2018, 18, 3803.

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