Generalized Image Acquisition and Analysis
A Kaleidoscopic Approach to Surround Geometry and Reflectance Acquisition
We describe a system for acquiring reflectance fields
of objects without moving parts and without a massively
parallel hardware setup. Our system consists of a set of
planar mirrors which serve to multiply a single camera and
a single projector into a multitude of virtual counterparts.
Using this arrangement, we can acquire reflectance fields
with an average angular sampling rate of about 120+
view/light pairs per surface point. The mirror system allows
for freely programmable illumination with full directional
coverage. We employ this setup to realize a 3D acquisition
system that employs structured illumination to capture the
unknown object geometry, in addition to dense reflectance
sampling. On the software side, we combine state-of-the-art
3D reconstruction algorithms with a reflectance sharing
technique based on non-negative matrix factorization
in order to reconstruct a joint model of geometry and
reflectance. We demonstrate for a number of test scenes
that the kaleidoscopic approach can acquire complex
reflectance properties faithfully. The main limitation is
that the multiplexing approach limits the attainable spatial
resolution, trading it off for improved directional coverage.
Projects
State of the Art in Computational Fabrication and Display of Material Appearance.
Eurographics STAR 2013
Abstract
After decades of research on digital representations of
material and object appearance, computer graphics has more
recently turned to the problem of creating physical
artifacts with controllable appearance characteristics.
While this work has mostly progressed in two parallel
streams – display technologies as well as novel fabrication
processes – we believe there is a large overlap and the
potential for synergies between these two approaches. In
this report, we summarize research efforts from the worlds
of fabrication display, and categorize the different
approaches into a common taxonomy. We believe that this
report can serve as a basis for systematic exploration of
the design space in future research.
Bibtex
@inproceedings{Hullin13:STAR,
author = {Matthias B. Hullin and Ivo Ihrke and Wolfgang Heidrich and Tim Weyrich and Gerwin Damberg and Martin Fuchs},
title = {State of the Art in Computational Fabrication and Display of Material Appearance},
booktitle = {STAR Proceedings of Eurographics},
year = 2013,
pages = {xx--yy},
}
author = {Matthias B. Hullin and Ivo Ihrke and Wolfgang Heidrich and Tim Weyrich and Gerwin Damberg and Martin Fuchs},
title = {State of the Art in Computational Fabrication and Display of Material Appearance},
booktitle = {STAR Proceedings of Eurographics},
year = 2013,
pages = {xx--yy},
}