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Shield fields: modeling and capturing 3D occluders

Published: 01 December 2008 Publication History

Abstract

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 theoretical result is that shield fields can be used to decouple the effects of occluders and incident illumination. We first describe the properties of shield fields in the frequency-domain and briefly analyze the "forward" problem of efficiently computing cast shadows. Afterwards, we apply the shield field signal-processing framework to make several new observations regarding the "inverse" problem of reconstructing 3D occluders from cast shadows -- extending previous work on shape-from-silhouette and visual hull methods. From this analysis we develop the first single-camera, single-shot approach to capture visual hulls without requiring moving or programmable illumination. We analyze several competing camera designs, ultimately leading to the development of a new large-format, mask-based light field camera that exploits optimal tiled-broadband codes for light-efficient shield field capture. We conclude by presenting a detailed experimental analysis of shield field capture and 3D occluder reconstruction.

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Cited By

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  • (2021)Review of light field technologiesVisual Computing for Industry, Biomedicine, and Art10.1186/s42492-021-00096-84:1Online publication date: 3-Dec-2021
  • (2021)Objects as Cameras: Estimating High-Frequency Illumination from Shadows2021 IEEE/CVF International Conference on Computer Vision (ICCV)10.1109/ICCV48922.2021.00259(2573-2582)Online publication date: Oct-2021
  • (2019)Local light field fusionACM Transactions on Graphics10.1145/3306346.332298038:4(1-14)Online publication date: 12-Jul-2019
  • Show More Cited By

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Published In

cover image ACM Conferences
SIGGRAPH Asia '08: ACM SIGGRAPH Asia 2008 papers
December 2008
581 pages
ISBN:9781450318310
DOI:10.1145/1457515
  • Editor:
  • John C. Hart
Permission to make digital or hard copies of all or part of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for profit or commercial advantage and that copies bear this notice and the full citation on the first page. Copyrights for components of this work owned by others than ACM must be honored. Abstracting with credit is permitted. To copy otherwise, or republish, to post on servers or to redistribute to lists, requires prior specific permission and/or a fee. Request permissions from [email protected]

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Publication History

Published: 01 December 2008

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Author Tags

  1. cast shadows
  2. coded aperture imaging
  3. computational photography
  4. light fields
  5. light transport
  6. visual hull

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SIGGRAPH Asia '08 Paper Acceptance Rate 59 of 320 submissions, 18%;
Overall Acceptance Rate 178 of 869 submissions, 20%

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Cited By

View all
  • (2021)Review of light field technologiesVisual Computing for Industry, Biomedicine, and Art10.1186/s42492-021-00096-84:1Online publication date: 3-Dec-2021
  • (2021)Objects as Cameras: Estimating High-Frequency Illumination from Shadows2021 IEEE/CVF International Conference on Computer Vision (ICCV)10.1109/ICCV48922.2021.00259(2573-2582)Online publication date: Oct-2021
  • (2019)Local light field fusionACM Transactions on Graphics10.1145/3306346.332298038:4(1-14)Online publication date: 12-Jul-2019
  • (2014)A Framework for Analysis of Computational Imaging Systems: Role of Signal Prior, Sensor Noise and MultiplexingIEEE Transactions on Pattern Analysis and Machine Intelligence10.1109/TPAMI.2014.231311836:10(1909-1921)Online publication date: Oct-2014
  • (2010)Descattering Transmission via Angular FilteringComputer Vision – ECCV 201010.1007/978-3-642-15549-9_7(86-99)Online publication date: 2010
  • (2009)Shadow multiplexing for real-time silhouette extraction2009 IEEE Computer Society Conference on Computer Vision and Pattern Recognition Workshops10.1109/CVPRW.2009.5204341(61-68)Online publication date: Jun-2009

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