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1. Original volume losslessly compressed to 54 MB (ratio 2.7:1). 2. Rendered volume using 11% of full data size (16 MB, ratio 9:1). 3. Rendered volume using 1.4% of full data size (2.0 MB, ratio 72:1). 4. Rendered volume using 0.3% of full data size (0.44 MB, ratio 326:1). Figure 1: Data reduction effects using Adaptive Decompression with our High Quality(More)
In this paper we present an in situ evaluation of a haptic system, with a representative test population, we aim to determine what, if any, benefit haptics can have in a biomolecular education context. We have developed a haptic application for conveying concepts of molecular interactions, specifically in protein-ligand docking. Utilizing a semi-immersive(More)
This article presents two new parametric models of the <i>Bidirectional Reflectance Distribution Function</i> (BRDF), one inspired by the Rayleigh-Rice theory for light scattering from optically smooth surfaces, and one inspired by micro-facet theory. The models represent scattering from a wide range of glossy surface types with high accuracy. In(More)
Direct Volume Rendering (DVR) is of increasing diagnostic value in the analysis of data sets captured using the latest medical imaging modalities. The deployment of DVR in everyday clinical work, however, has so far been limited. One contributing factor is that current Transfer Function (TF) models can encode only a small fraction of the user's domain(More)
We present a general, proxy-based approach to volume haptics founded upon the notion of 'haptic primi-tives'. Haptic modes each representing a different aspect of volumetric data, are created by defining sets of haptic primitives which reflect the local properties of the data. The proxy position for every time-frame in the hap-tic loop is found by balancing(More)
  • Marc Bourgois, Matthew Cooper, Vu Duong, Jonas Hjalmarsson, Marcus Lange, Anders Ynnerman
  • 2005
Air traffic control (ATC) is a human-dependent safety critical activity therefore the information that is made available to the human decision-maker-the controller-is of extreme importance. In ATC, the design of human-machine interfaces requires particular attention, especially when a new technology is considered. To support the investigation on the(More)
We present a novel approach to interactive and concurrent volume visualization of functional Magnetic Resonance Imaging (fMRI). While the patient is in the scanner, data is extracted in real-time using state-of-the-art signal processing techniques. The fMRI signal is treated as light emission when rendering a patient-specific high resolution reference MRI(More)
—We present the first step towards a brain computer interface (BCI) for communication using real-time functional magnetic resonance imaging (fMRI). The subject in the MR scanner sees a virtual keyboard and steers a cursor to select different letters that can be combined to create words. The cursor is moved to the left by activating the left hand, to the(More)
Multi-dimensional Transfer Functions (MDTFs) are increasingly used in volume rendering to produce high quality visualizations of complex data sets. A major factor limiting the use of MDTFs is that the available design tools have not been simple enough to reach wide usage outside of the research context, for instance in clinical medical imaging. In this(More)