EuroVisShort2018

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Colored Stochastic Shadow Mapping for Direct Volume Rendering
(The Eurographics Association, 2018) Weidner, Johannes; Linsen, Lars; Jimmy Johansson and Filip Sadlo and Tobias Schreck
Creating direct volume renderings with shadows can lead to a better perception of the rendered images. Deep shadow maps is an effective and efficient approach to compute shadows at interactive rates. We propose an alternative approach based on colored stochastic shadow maps (CSSM), which can produce higher-quality colored shadows while using less texture memory. CSSM is based on a stochastic generation of the shadow map, which is queried multiple times for denoising during rendering.
Pressure-based Vortex Extraction in Cardiac 4D PC-MRI Blood Flow Data
(The Eurographics Association, 2018) Köhler, Benjamin; Grothoff, Matthias; Gutberlet, Matthias; Preim, Bernhard; Jimmy Johansson and Filip Sadlo and Tobias Schreck
We propose a technique for vortex extraction in cardiac 4D PC-MRI blood flow data that employs an intravascular, relative pressure calculation. The method is easy to implement, runs fully automatically, and requires no user-defined parameters. We qualitatively evaluated 100+ datasets of the aorta, pulmonary artery, or left ventricle from healthy volunteers as well as from patients acquired with different MR scanners. In all cases, the results suffer from significantly less noise than comparable approaches using the common λ 2 vortex criterion.