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Spatially Varying Image Based Lighting by Light Probe Sequences, Capture, Processing and Rendering
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.ORCID iD: 0000-0002-9466-9826
2007 (English)In: The Visual Computer, ISSN 0178-2789, E-ISSN 1432-2315, Vol. 23, no 7, 453-465 p.Article in journal (Refereed) Published
Abstract [en]

We present a novel technique for capturing spatially or temporally resolved light probe sequences, and using them for image based lighting. For this purpose we have designed and built a real-time light probe, a catadioptric imaging system that can capture the full dynamic range of the lighting incident at each point in space at video frame rates, while being moved through a scene. The real-time light probe uses a digital imaging system which we have programmed to capture high quality, photometrically accurate color images of 512×512 pixels with a dynamic range of 10000000:1 at 25 frames per second.

By tracking the position and orientation of the light probe, it is possible to transform each light probe into a common frame of reference in world coordinates, and map each point and direction in space along the path of motion to a particular frame and pixel in the light probe sequence. We demonstrate our technique by rendering synthetic objects illuminated by complex real world lighting, first by using traditional image based lighting methods and temporally varying light probe illumination, and second an extension to handle spatially varying lighting conditions across large objects and object motion along an extended path.

Place, publisher, year, edition, pages
Springer Link , 2007. Vol. 23, no 7, 453-465 p.
Keyword [en]
High dynamic range imaging, Image based lighting
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-16285DOI: 10.1007/s00371-007-0127-6OAI: oai:DiVA.org:liu-16285DiVA: diva2:133599
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, StefanYnnerman, Anders

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