We present a system for tracking the hands of a user in a frontal camera view for gesture recognition purposes. The system uses multiple cues, incorporates tracing and prediction algorithms, and applies probabilistic inference to determine the trajectories of the hands reliably even in case of hand-face overlap. A method for assessing tracking quality is also introduced. Tests were performed wi...

Due to the advent of ray tracing at interactive speeds and because there is an absence of a way to measure and compare performance and quality of ray traced scenes that are animated, we present an organized way to do this objectively and accurately in this proposal for BART: A Benchmark for Animated Ray Tracing. This is a suite of test scenes, placed in the public domain, designed to stress ray...

Ray tracing algorithms often approximate indirect diiuse lighting by means of an ambient lighting term. In this paper we show how a similar term can be used as a variance reducing technique for stochastic ray tracing. In a theoretical derivation we prove that the technique is mathematically correct. Test results demonstrate its usefulness and eeectiveness in practice.

Fisheye views of graphs are pictures of layouted graphs as seen through a sheye lens. They allow to display, in one picture, a small part of the graph enlarged while the graph is shown completely. Thus they combine the features of a zoom|presenting details| and of an overview picture|showing global structure. In previous work the part of the graph to be enlarged|the focus region|was deened by a...

Player traces can result in a vast amount of high-dimensional data. This information is crucial to game designers trying to understand player behaviour and for tailoring the game experience. In this work we investigate different approaches to clustering player traces in order to expose useful game information. We consider three trace similarity metrics, as well as two clustering algorithms. We ...

For almost two decades researchers have argued that ray tracing will eventually become faster than the rasterization technique that completely dominates todays graphics hardware. However, this has not happened yet. Ray tracing is still exclusively being used for off-line rendering of photorealistic images and it is commonly believed that ray tracing is simply too costly to ever challenge raster...

(a) L R s (u; s) C i (u) (b) L R s (u; s) C i (u) Figure 9: A direct intersection curve tracing of a DSSI between a developable surface R s (u; s) and the Utah teapot, is used to derive the domain of C i (u) that is in shadow. Two views of the same scene are provides. a tight link between two diicult problems from the two elds of computer graphics and computer aided geometric design, namely SSI...

Various kinds of e-learning systems, such as Massively Open Online Courses and intelligent tutoring systems, are now producing large amounts of feature-rich data from students solving items at different levels of proficiency over time. To analyze such data, researchers often use Knowledge Tracing [4], a 20-year old method that has become the de-facto standard for inferring student knowledge fro...

Subdivision Surfaces as well as (interactive) ray tracing have become an important issue in computer graphics. But ray tracing of subdivision surfaces has received only little attention. We present a new approach for ray tracing of subdivision surfaces. The algorithm uses a projection of the ray onto the surface and works mainly in two dimensions along this projection. While proceeding from pat...

We describe a dynamic load-balancing algorithm for ray-tracing by progressive refinement on a distributed-memory parallel computer. Parallelization of progressive ray-tracing for single images is difficult because of the inherent sequential nature of the sample location generation process, which is optimized (and different) for any given image. Parallelization of progressive ray-tracing when ge...