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Free Form Incident Light Fields
Linköping University, Department of Science and Technology, Visual Information Technology and Applications (VITA). Linköping University, The Institute of Technology.ORCID iD: 0000-0002-7765-1747
Linköping University, Department of Science and Technology, Visual Information Technology and Applications (VITA). Linköping University, The Institute of Technology.ORCID iD: 0000-0003-2559-6122
Linköping University, Department of Science and Technology, Visual Information Technology and Applications (VITA). Linköping University, The Institute of Technology.
Linköping University, Department of Science and Technology, Visual Information Technology and Applications (VITA). Linköping University, The Institute of Technology.ORCID iD: 0000-0002-9466-9826
2008 (English)In: Computer graphics forum (Print), ISSN 0167-7055, E-ISSN 1467-8659, Vol. 27, no 4, 1293-1301 p.Article in journal (Refereed) Published
Abstract [en]

This paper presents methods for photo-realistic rendering using strongly spatially variant illumination captured from real scenes. The illumination is captured along arbitrary paths in space using a high dynamic range, HDR, video camera system with position tracking. Light samples are rearranged into 4-D incident light fields (ILF) suitable for direct use as illumination in renderings. Analysis of the captured data allows for estimation of the shape, position and spatial and angular properties of light sources in the scene. The estimated light sources can be extracted from the large 4D data set and handled separately to render scenes more efficiently and with higher quality. The ILF lighting can also be edited for detailed artistic control.

Place, publisher, year, edition, pages
Wiley InterScience , 2008. Vol. 27, no 4, 1293-1301 p.
Keyword [en]
Three-Dimensional Graphics and Realism, Digitization and Image Capture
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-16286DOI: 10.1111/j.1467-8659.2008.01268.xOAI: oai:DiVA.org:liu-16286DiVA: diva2:133602
Available from: 2009-01-13 Created: 2009-01-13 Last updated: 2017-12-14Bibliographically approved
In thesis
1. Incident Light Fields
Open this publication in new window or tab >>Incident Light Fields
2009 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Image based lighting, (IBL), is a computer graphics technique for creating photorealistic renderings of synthetic objects such that they can be placed into real world scenes. IBL has been widely recognized and is today used in commercial production pipelines. However, the current techniques only use illumination captured at a single point in space. This means that traditional IBL cannot capture or recreate effects such as cast shadows, shafts of light or other important spatial variations in the illumination. Such lighting effects are, in many cases, artistically created or are there to emphasize certain features, and are therefore a very important part of the visual appearance of a scene.

This thesis and the included papers present methods that extend IBL to allow for capture and rendering with spatially varying illumination. This is accomplished by measuring the light field incident onto a region in space, called an Incident Light Field, (ILF), and using it as illumination in renderings. This requires the illumination to be captured at a large number of points in space instead of just one. The complexity of the capture methods and rendering algorithms are then significantly increased.

The technique for measuring spatially varying illumination in real scenes is based on capture of High Dynamic Range, (HDR), image sequences. For efficient measurement, the image capture is performed at video frame rates. The captured illumination information in the image sequences is processed such that it can be used in computer graphics rendering. By extracting high intensity regions from the captured data and representing them separately, this thesis also describes a technique for increasing rendering efficiency and methods for editing the captured illumination, for example artificially moving or turning on and of individual light sources.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2009. 97 p.
Series
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 1233
Keyword
Computer Graphics, Image Based Lighting, Photorealistic Rendering, Light Fields, High Dynamic Range Imaging
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-16287 (URN)978-91-7393-717-7 (ISBN)
Public defence
2009-01-30, K3, Kåkenhus, Campus Norrköping, Linköpings universitet, Norrköping, 10:15 (English)
Opponent
Supervisors
Available from: 2009-01-13 Created: 2009-01-13 Last updated: 2016-08-31Bibliographically approved

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Unger, JonasGustavson, StefanPer, LarssonYnnerman, Anders

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