[Back]

A. Walch:
"Lens Flare Prediction based on Measurements with Real-Time Visualization";
Supervisor: W. Purgathofer; Institut für Computergraphik und Algorithmen, 2017; final examination: 2017-03-13.

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.

http://publik.tuwien.ac.at/files/publik_261585.pdf