Polarization imaging reflectometry in the wild
File(s)
Published version
Author(s)
Riviere, Jeremy
Reshetouski, Ilya
Ghosh, Abhijeet
Type
Report
Abstract
We present a novel approach for on-site acquisition of surface reflectance
for planar, spatially varying, isotropic materials in uncontrolled
outdoor environments. Our method exploits the naturally
occuring linear polarization of incident illumination: by rotating a
linear polarizing filter in front of a camera at 3 different orientations,
we measure the linear polarization reflected off the sample
and combine this information with multiview analysis and inverse
rendering in order to recover per-pixel, high resolution reflectance
maps. We exploit polarization both for diffuse/specular separation
and surface normals estimation by combining polarization measurements
from at least two near orthogonal views close to Brewster
angle of incidence. We then use our estimates of surface normals
and albedos in an inverse rendering framework to recover specular
roughness. To the best of our knowledge, our method is the first
to successfully extract a complete set of reflectance parameters with
passive capture in completely uncontrolled outdoor environments.
for planar, spatially varying, isotropic materials in uncontrolled
outdoor environments. Our method exploits the naturally
occuring linear polarization of incident illumination: by rotating a
linear polarizing filter in front of a camera at 3 different orientations,
we measure the linear polarization reflected off the sample
and combine this information with multiview analysis and inverse
rendering in order to recover per-pixel, high resolution reflectance
maps. We exploit polarization both for diffuse/specular separation
and surface normals estimation by combining polarization measurements
from at least two near orthogonal views close to Brewster
angle of incidence. We then use our estimates of surface normals
and albedos in an inverse rendering framework to recover specular
roughness. To the best of our knowledge, our method is the first
to successfully extract a complete set of reflectance parameters with
passive capture in completely uncontrolled outdoor environments.
Date Issued
2016-01-01
Citation
Departmental Technical Report: 16/8, 2016, pp.1-11
Publisher
Department of Computing, Imperial College London
Start Page
1
End Page
11
Journal / Book Title
Departmental Technical Report: 16/8
Copyright Statement
© 2016 The Author(s). This report is available open access under a CC-BY-NC-ND (https://creativecommons.org/licenses/by-nc-nd/4.0/)
Publication Status
Published
Article Number
16/8