Publications of Wolfgang Effelsberg

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Stephan Kopf, Thomas Haenselmann, Johannes Kiess, Benjamin Guthier und Wolfgang Effelsberg. 2011 Algorithms for video retargeting Multimedia Tools and Applications, 51, 19, 819-861

Benjamin Guthier, Stephan Kopf, Marc Eble und Wolfgang Effelsberg. SPIE, 2011 Flicker Reduction in Tone Mapped High Dynamic Range Video Proceedings of SPIE. Bellingham, Wash.
Philip Mildner, Tonio Triebel, Stephan Kopf und Wolfgang Effelsberg. ICST, 2011 A scalable Peer-to-Peer-overlay for real-time massively multiplayer online games . Brussels

Benjamin Guthier, Stephan Kopf und Wolfgang Effelsberg. , 2011 Optimal Shutter Speed Sequences for Real-Time HDR Video , .
A technique to create High Dynamic Range (HDR) video frames is to capture Low Dynamic Range (LDR) images at varying shutter speeds. They are then merged into a single image covering the entire brightness range of the scene. While shutter speeds are often chosen to vary by a constant factor, we propose an adaptive approach. The scene's histogram together with functions judging the contribution of an LDR exposure to the HDR result are used to compute a sequence of shutter speeds. This sequence allows for the estimation of the scene's radiance map with a high degree of accuracy. We show that, in comparison to the traditional approach, our algorithm achieves a higher quality of the HDR image for the same number of captured LDR exposures. Our algorithm is suited for creating HDR videos of scenes with varying brightness conditions in real-time, which applications like video surveillance benefit from.