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Displaying 1-27 out of 27 total
Multi-Touch Table System for Medical Visualization: Application to Orthopedic Surgery Planning
Found in: IEEE Transactions on Visualization and Computer Graphics
By Claes Lundström,Thomas Rydell,Camilla Forsell,Anders Persson,Anders Ynnerman
Issue Date:December 2011
pp. 1775-1784
Medical imaging plays a central role in a vast range of healthcare practices. The usefulness of 3D visualizations has been demonstrated for many types of treatment planning. Nevertheless, full access to 3D renderings outside of the radiology department is ...
Spatial Conditioning of Transfer Functions Using Local Material Distributions
Found in: IEEE Transactions on Visualization and Computer Graphics
By Stefan Lindholm, Patric Ljung, Claes Lundström, Anders Persson, Anders Ynnerman
Issue Date:November 2010
pp. 1301-1310
In many applications of Direct Volume Rendering (DVR) the importance of a certain material or feature is highly dependent on its relative spatial location. For instance, in the medical diagnostic procedure, the patient's symptoms often lead to specificatio...
A Brain Computer Interface for Communication Using Real-Time fMRI
Found in: Pattern Recognition, International Conference on
By Anders Eklund, Mats Andersson, Henrik Ohlsson, Anders Ynnerman, Hans Knutsson
Issue Date:August 2010
pp. 3665-3669
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 ca...
Visualization of sensor data using mobile phone augmented reality
Found in: Mixed and Augmented Reality, IEEE / ACM International Symposium on
By Ann-sofie Gunnarsson, Malinda Rauhala, Anders Henrysson, Anders Ynnerman
Issue Date:October 2006
pp. 233-234
No summary available.
Full Body Virtual Autopsies using a State-of-the-art Volume Rendering Pipeline
Found in: IEEE Transactions on Visualization and Computer Graphics
By Patric Ljung,Calle Winskog,Anders Persson,Claes Lundström,Anders Ynnerman
Issue Date:September 2006
pp. 869-876
This paper presents a procedure for virtual autopsies based on interactive 3D visualizations of large scale, high resolution data from CT-scans of human cadavers. The procedure is described using examples from forensic medicine and the added value and futu...
Image Plane Sweep Volume Illumination
Found in: IEEE Transactions on Visualization and Computer Graphics
By Erik Sundén,Anders Ynnerman,Timo Ropinski
Issue Date:December 2011
pp. 2125-2134
In recent years, many volumetric illumination models have been proposed, which have the potential to simulate advanced lighting effects and thus support improved image comprehension. Although volume ray-casting is widely accepted as the volume rendering te...
General Proxy-Based Haptics for Volume Visualization
Found in: World Haptics Conference
By Karljohan Lundin, Björn Gudmundsson, Anders Ynnerman
Issue Date:March 2005
pp. 557-560
We present a general, proxy-based approach to volume haptics founded upon the notion of ?haptic primitives?. Haptic modes each representing a different aspect of volumetric data, are created by defining sets of haptic primitives which reflect the local pro...
Parameter estimation variance of the single point active alignment method in optical see-through head mounted display calibration
Found in: Virtual Reality Conference, IEEE
By M Axholt,M A Skoglund,Stephen D O'Connell,Matthew D Cooper,Stephen R Ellis,Anders Ynnerman
Issue Date:March 2011
pp. 27-34
The parameter estimation variance of the Single Point Active Alignment Method (SPAAM) is studied through an experiment where 11 subjects are instructed to create alignments using an Optical See-Through Head Mounted Display (OSTHMD) such that three separate...
Efficient Visibility Encoding for Dynamic Illumination in Direct Volume Rendering
Found in: IEEE Transactions on Visualization and Computer Graphics
By Joel Kronander,Daniel Jönsson,Joakim Löw,Patric Ljung,Anders Ynnerman,Jonas Unger
Issue Date:March 2012
pp. 447-462
We present an algorithm that enables real-time dynamic shading in direct volume rendering using general lighting, including directional lights, point lights, and environment maps. Real-time performance is achieved by encoding local and global volumetric vi...
Torchlight Navigation
Found in: Pattern Recognition, International Conference on
By Michael Felsberg, Fredrik Larsson, Wang Han, Anders Ynnerman, Thomas B. Schön
Issue Date:August 2010
pp. 302-306
A common computer vision task is navigation and mapping. Many indoor navigation tasks require depth knowledge of flat, unstructured surfaces (walls, floor, ceiling). With passive illumination only, this is an ill-posed problem. Inspired by small children u...
Local Ambient Occlusion in Direct Volume Rendering
Found in: IEEE Transactions on Visualization and Computer Graphics
By Frida Hernell, Patric Ljung, Anders Ynnerman
Issue Date:July 2010
pp. 548-559
This paper presents a novel technique to efficiently compute illumination for Direct Volume Rendering using a local approximation of ambient occlusion to integrate the intensity of incident light for each voxel. An advantage with this local approach is tha...
Improved feature detection over large force ranges using history dependent transfer functions
Found in: World Haptics Conference
By Petter Bivall Persson, Matthew D. Cooper, Gunnar E. Host, Lena A.E. Tibell, Anders Ynnerman
Issue Date:March 2009
pp. 476-481
In this paper we present a history dependent transfer function (HDTF) as a possible approach to enable improved haptic feature detection in high dynamic range (HDR) volume data. The HDTF is a multi-dimensional transfer function that uses the recent force h...
Seeing Beyond Statistics: Visual Exploration of Productivity on a Construction Site
Found in: Visualisation, International Conference on
By Katerina Vrotsou, Anders Ynnerman, Matthew Cooper
Issue Date:July 2008
pp. 37-42
Work on the construction site is known to be inefficient due to workers spending much time waiting for materials, transporting materials and from frequent interruptions of tasks. Studies on the construction site typically use statistical measures to analys...
Visual Analytics Presentation Tools Applied in HTML Documents
Found in: Information Visualisation, International Conference on
By Mikael Jern, Jakob Rogstadius, Tobias Åström, Anders Ynnerman
Issue Date:July 2008
pp. 200-207
In this paper we present novel means to communicate and present gained knowledge using semi-guided interactive visualizations embedded in standard HTML documents. The goal of the work is to let the analyst (author) explore data and simultaneously save impo...
Guest Editor's Introduction: Special Section on EuroVis
Found in: IEEE Transactions on Visualization and Computer Graphics
By Ken Museth, Anders Ynnerman, Torsten Möller
Issue Date:July 2008
pp. 725-726
No summary available.
Haptic Rendering of Dynamic Volumetric Data
Found in: IEEE Transactions on Visualization and Computer Graphics
By Karljohan Lundin Palmerius, Matthew Cooper, Anders Ynnerman
Issue Date:March 2008
pp. 263-276
<p><b>Abstract</b>—With current methods for volume haptics in scientific visualization, features in time-varying data can freely move straight through the haptic probe without generating any haptic feedback ? the algorithms are simply not...
Designing and Evaluating a Haptic System for Biomolecular Education
Found in: Virtual Reality Conference, IEEE
By Petter Bivall Persson, Matthew D. Cooper, Lena A.E. Tibell, Shaaron Ainsworth, Anders Ynnerman, Bengt-Harald Jonsson
Issue Date:March 2007
pp. 171-178
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 c...
Transfer Function Based Adaptive Decompression for Volume Rendering of Large Medical Data Sets
Found in: Volume Visualization and Graphics, IEEE Symposium on
By Patric Ljung, Claes Lundström, Anders Ynnerman, Ken Museth
Issue Date:October 2004
pp. 25-32
The size of standard volumetric data sets in medical imaging is rapidly increasing causing severe performance limitations in direct volume rendering pipelines. The methods presented in this paper exploit the medical knowledge embedded in the transfer funct...
A Haptic Interface for Dose Planning in Stereo-Tactic Radio-Surgery
Found in: Information Visualisation, International Conference on
By Ida Olofsson, Karljohan Lundin, Matthew Cooper, Per Kjäll, Anders Ynnerman
Issue Date:July 2004
pp. 200-205
When planning a Leksell GammaKnife? treatment, dose planners place iso-centres of the irradiation field in such a way that a certain iso-dose surface conforms as closely as possible to a target, such as a tumour. Today this planning is done primarily in 2D...
Interactive Visualization of Particle-In-Cell Simulations
Found in: Visualization Conference, IEEE
By Patric Ljung, Mark Dieckmann, Niclas Andersson, Anders Ynnerman
Issue Date:October 2000
pp. 29
In this work we present a visualization system for interactive real-time animation and visualization of simulation results from a par-allel Particle-In-Cell code. The system was designed and imple-mented for the Onyx2 InifiniteReality hardware. A number of...
Boundary Aware Reconstruction of Scalar Fields
Found in: IEEE Transactions on Visualization and Computer Graphics
By Stefan Lindholm,Daniel Jonsson,Charles Hansen,Anders Ynnerman
Issue Date:February 2015
pp. 1
In visualization, the combined role of data reconstruction and its classification plays a crucial role. In this paper we propose a novel approach that improves classification of different materials and their boundaries by combining information from the cla...
Verifying Volume Rendering Using Discretization Error Analysis
Found in: IEEE Transactions on Visualization and Computer Graphics
By Tiago Etiene,Daniel Jonsson,Timo Ropinski,Carlos Scheidegger,Joao L. D. Comba,Luis Gustavo Nonato,Robert M. Kirby,Anders Ynnerman,Claudio T. Silva
Issue Date:January 2014
pp. 140-154
We propose an approach for verification of volume rendering correctness based on an analysis of the volume rendering integral, the basis of most DVR algorithms. With respect to the most common discretization of this continuous model (Riemann summation), we...
BRDF models for accurate and efficient rendering of glossy surfaces
Found in: ACM Transactions on Graphics (TOG)
By Jonas Unger, Anders Ynnerman, Joakim Low, Joel Kronander
Issue Date:January 2012
pp. 1-14
This article presents two new parametric models of the Bidirectional Reflectance Distribution Function (BRDF), one inspired by the Rayleigh-Rice theory for light scattering from optically smooth surfaces, and one inspired by micro-facet theory. The models ...
HDR light probe sequence resampling for realtime incident light field rendering
Found in: Proceedings of the 2009 Spring Conference on Computer Graphics (SCCG '09)
By Anders Ynnerman, Joakim Low, Jonas Unger, Per Larsson
Issue Date:April 2009
pp. 43-50
This paper presents a method for resampling a sequence of high dynamic range light probe images into a representation of Incident Light Field (ILF) illumination which enables realtime rendering. The light probe sequences are captured at varying positions i...
Flow field visualization using vector field perpendicular surfaces
Found in: Proceedings of the 2009 Spring Conference on Computer Graphics (SCCG '09)
By Anders Ynnerman, Karljohan Lundin Palmerius, Matthew Cooper
Issue Date:April 2009
pp. 27-34
This paper introduces Vector Field Perpendicular Surfaces as a means to represent vector data with special focus on variations across the vectors in the field. These surfaces are a perpendicular analogue to streamlines, with the vector data always being pa...
Now and then, here and there: industrilandskapet
Found in: ACM SIGGRAPH 2002 conference abstracts and applications (SIGGRAPH '02)
By Anders Ynnerman, Konstantin Economou, Mark Ollila, Martin Etherton Friberg
Issue Date:July 2002
pp. 223-223
As cultural heritages go, or rather stand firm, the Norrköping "industrial landscape" (industrilandskapet in Swedish) has been the object of cultural regeneration over the last two decades. Once, one of Sweden's largest city center industrial sites, m...
Interactive visualization of large scale time varying data sets
Found in: ACM SIGGRAPH 2002 conference abstracts and applications (SIGGRAPH '02)
By Anders Ynnerman, Mark Dieckmann, Patric Ljung
Issue Date:July 2002
pp. 204-204
Visual analysis of time varying scientific data can be divided into four different categories with an increasing degree of user interaction. 1) Production of static images representing scientific data at selected times. 2) Production of video sequences in ...