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- Holger Dammertz, Daniel Sewtz, Johannes Hanika, Hendrik P. A. Lensch
- High Performance Graphics
- 2010

We present a fast and simple filtering method designed for ray traced Monte Carlo global illumination images which achieves real-time rates. Even on modern hardware only few samples can be traced for interactive applications, resulting in very noisy outputs. Taking advantage of the fact that Monte Carlo computes hemispherical integrals that may be very… (More)

- Holger Dammertz, Johannes Hanika, Alexander Keller
- Comput. Graph. Forum
- 2008

Photorealistic image synthesis is a computationally demanding task that relies on ray tracing for the evaluation of integrals. Rendering time is dominated by tracing long paths that are very incoherent by construction. We therefore investigate the use of SIMD instructions to accelerate incoherent rays. SIMD is used in the hierarchy construction, the tree… (More)

- Manuel Finckh, Holger Dammertz, Hendrik P. A. Lensch
- ECCV
- 2010

In this work we investigate an inverse geometry problem. Given a light source, a diffuse plane and a caustic image, how must a geometric object look like (transmissive or reflective) in oder to project the desired caustic onto the diffuse plane when lit by the light source? In order to construct the geometry we apply an analysis-by-synthesis approach,… (More)

- H. Dammertz, A. Keller
- 2006

Instead of computing intersections along a ray, an algorithm is proposed that determines a point of intersection in object space. The method is based on the classical refinement of a hierarchy of axisaligned bounding boxes that is computed on the fly. Typical rendering artifacts are avoided by taking into consideration the precision of floating point… (More)

- Holger Dammertz, Alexander Keller, Hendrik P. A. Lensch
- Comput. Graph. Forum
- 2010

We present a physically-based progressive global illumination system that is capable of simulating complex lighting situations robustly by efficiently using both light and eye paths. Specifically, we combine three distinct algorithms: point-light-based illumination which produces low-noise approximations for diffuse inter-reflections, specular gathering for… (More)

- B. Steinert, Holger Dammertz, Johannes Hanika, Hendrik P. A. Lensch
- Comput. Graph. Forum
- 2011

We present a massively parallel object recognition system based on a cortex-like structure. Due to its nature, this general, biologically motivated system can be parallelized efficiently on recent many-core graphics processing units (GPU). By implementing the entire pipeline on the GPU, by rigorously optimizing memory bandwidth and by minimizing branch… (More)

- Holger Dammertz, Johannes Hanika
- J. Graphics, GPU, & Game Tools
- 2009

Expressing mental images visually as 3D scenes is a time-consuming challenge. Therefore, we employ natural language to facilitate the creation of virtual environments. In this paper, we present a framework, which automatically converts an arbitrary descriptive text into a representative 3D scene. Our system parses a user-written input text, extracts… (More)

- Johannes Hanika, Holger Dammertz, Hendrik P. A. Lensch
- Comput. Graph. Forum
- 2011

In this paper we extend the edge-avoiding à-trous wavelet transform for local contrast enhancement while avoiding common artifacts such as halos and gradient reversals. We show that this algorithm is a highly efficient and robust tool for image manipulation based on multi-scale decompositions. It can achieve comparable results to previous high-quality… (More)