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A Real Time Light Probe
Linköping University, Department of Science and Technology, Visual Information Technology and Applications (VITA). Linköping University, The Institute of Technology. (Norrköping Visualization and Interaction Studio)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
Integrated Vision Products AB, Sweden.
Integrated Vision Products AB, Sweden.
2004 (English)In: The 25th Eurographics Annual Conference 2004 Short papers and Interactive Applications, Grenoble, France, 2004Conference paper, Published paper (Refereed)
Abstract [en]

We present a novel system capable of capturing high dynamic range (HDR) Light Probes at video speed. Each Light Probe frame is built from an individual full set of exposures, all of which are captured within the frame time. The exposures are processed and assembled into a mantissa-exponent representation image within the camera unit before output, and then streamed to a standard PC. As an example, the system is capable of capturing Light Probe Images with a resolution of 512x512 pixels using a set of 10 exposures covering 15 f-stops at a frame rate of up to 25 final HDR frames per second. The system is built around commercial special-purpose camera hardware with on-chip programmable image processing logic and tightly integrated frame buffer memory, and the algorithm is implemented as custom downloadable microcode software.

Place, publisher, year, edition, pages
2004.
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-16282OAI: oai:DiVA.org:liu-16282DiVA: diva2:133594
Conference
Eurographics Annual Conference 2004
Available from: 2009-01-13 Created: 2009-01-13 Last updated: 2015-09-22Bibliographically 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, Stefan

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