Diffuse-specular separation using binary spherical gradient illumination

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Title: Diffuse-specular separation using binary spherical gradient illumination
Authors: Kampouris, C
Zafeiriou, S
Ghosh, A
Item Type: Conference Paper
Abstract: We introduce a novel method for view-independent diffuse-specular separation of albedo and photometric normals without requiring polarization using binary spherical gradient illumination. The key idea is that with binary gradient illumination, a dielectric surface oriented towards the dark hemisphere exhibits pure diffuse reflectance while a surface oriented towards the bright hemisphere exhibits both diffuse and specular reflectance. We exploit this observation to formulate diffuse-specular separation based on color-space analysis of a surface’s response to binary spherical gradients and their complements. The method does not impose restrictions on viewpoints and requires fewer photographs for multiview acquisition than polarized spherical gradient illumination. We further demonstrate an efficient two-shot capture using spectral multiplexing of the illumination that enables diffuse-specular separation of albedo and heuristic separation of photometric normals.
Issue Date: 1-Jul-2018
Date of Acceptance: 11-Jun-2018
URI: http://hdl.handle.net/10044/1/62142
DOI: https://dx.doi.org/10.2312/sre.20181167
ISBN: 978-3-03868-068-0
ISSN: 1727-3463
Publisher: The Eurographics Association
Journal / Book Title: Proceedings of Eurograpics Symposium on Rendering (EI&I)
Copyright Statement: © 2018 The Author(s). Eurographics Proceedings. © 2018 The Eurographics Association.
Sponsor/Funder: The Royal Society
Engineering & Physical Science Research Council (EPSRC)
Funder's Grant Number: WM 120040
Conference Name: Eurographics Symposium on Rendering (EGSR) 2018
Publication Status: Published
Start Date: 2018-07-01
Finish Date: 2018-07-04
Conference Place: Karlsruhe, Germany
Appears in Collections:Faculty of Engineering

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