Lens Flare Prediction based on Measurements with Real-Time Visualization | TU Wien

Information

Publication Type: Master Thesis
Workgroup(s)/Project(s):
- VRVis Competence Center
Date: March 2017
Date (Start): 2016
Date (End): 2017
First Supervisor: Werner Purgathofer

Abstract

Lens flare is a visual phenomenon caused by interreflection of light within a lens system. This effect is often undesired, but it gives rendered images a realistic appearance. In the area of computer graphics, several simulation based approaches have been presented to render lens flare for a given spherical lens system. An accurate model of the lens system and all its components is crucial for a physically reliable result. Since the effect differs from camera to camera, these methods are not flexible, and the internal parameters – especially the anti-reflection coatings – can only be approximated. In this thesis we present a novel workflow for generating physically plausible renderings of lens flare phenomena by analyzing the lens flares captured on a camera. Furthermore, our method allows to predict the occurrence of lens flares for a given light setup. This is an often requested feature in light planning applications in order to efficiently avoid lens flare prone light positioning. A model with a tight parameter set and a GPU-based rendering method allows our method to be used in real-time applications.

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BibTeX

@mastersthesis{Walch-2017-DA,
  title =      "Lens Flare Prediction based on Measurements with Real-Time
               Visualization",
  author =     "Andreas Walch",
  year =       "2017",
  abstract =   "Lens flare is a visual phenomenon caused by interreflection
               of light within a lens system. This effect is often
               undesired, but it gives rendered images a realistic
               appearance. In the area of computer graphics, several
               simulation based approaches have been presented to render
               lens flare for a given spherical lens system. An accurate
               model of the lens system and all its components is crucial
               for a physically reliable result. Since the effect differs
               from camera to camera, these methods are not flexible, and
               the internal parameters – especially the anti-reflection
               coatings – can only be approximated. In this thesis we
               present a novel workflow for generating physically plausible
               renderings of lens flare phenomena by analyzing the lens
               flares captured on a camera. Furthermore, our method allows
               to predict the occurrence of lens flares for a given light
               setup. This is an often requested feature in light planning
               applications in order to efficiently avoid lens flare prone
               light positioning. A model with a tight parameter set and a
               GPU-based rendering method allows our method to be used in
               real-time applications.",
  month =      mar,
  address =    "Favoritenstrasse 9-11/E193-02, A-1040 Vienna, Austria",
  school =     "Institute of Computer Graphics and Algorithms, Vienna
               University of Technology ",
  URL =        "https://www.cg.tuwien.ac.at/research/publications/2017/Walch-2017-DA/",
}