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Shield Fields: Modeling and Capturing 3D Occluders Douglas Lanman1,2

Summary: Shield Fields: Modeling and Capturing 3D Occluders
Douglas Lanman1,2
Ramesh Raskar1,3
Amit Agrawal1
Gabriel Taubin2
Mitsubishi Electric Research Laboratories (MERL) 2
Brown University 3
MIT Media Lab
Figure 1: Our shield field camera allows instantaneous capture and reconstruction of the visual hull of 3D occluders using static illumination.
(Left) The shield field camera, containing: an array of point lights, an object for reconstruction, and a large-format, mask-based light field
camera. (Middle) Combined shadowgrams imaged on a diffusing screen after passing through a tiled-broadband attenuator. (Right) Four
views of the visual hull reconstructed using only a single photograph captured by the proposed system.
We describe a unified representation of occluders in light transport
and photography using shield fields: the 4D attenuation function
which acts on any light field incident on an occluder. Our key the-
oretical result is that shield fields can be used to decouple the ef-
fects of occluders and incident illumination. We first describe the
properties of shield fields in the frequency-domain and briefly ana-


Source: Agrawal, Amit - Mitsubishi Electric Research Labs


Collections: Engineering