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Shape-based transfer functions for volume visualization

Shape-based transfer functions for volume visualization

引用

Pacific (formerly Asia-Pacific APVIS) visualization Symposium

作者： Jörg-Stefan Praßni Timo Ropinski Jörg Mensmann Klaus Hinrichs Westfalische Wilhelms-Universitat Munster Munster Nordrhein-Westfalen DE Visualization and Computer Graphics Research Group (VisCG) University of Münster Germany

ISBN: (纸本)9781424466856

We present a novel classification technique for volume visualization that takes the shape of volumetric features into account. The presented technique enables the user to distinguish features based on their 3D shape and to assign individual optical properties to these. Based on a rough pre-segmentation that can be done by windowing, we exploit the curve-skeleton of each volumetric structure in order to derive a shape descriptor similar to those used in current shape recognition algorithms. The shape descriptor distinguishes three main shape classes: longitudinal, surface-like, and blobby shapes. In contrast to previous approaches, the classification is not performed on a per-voxel level but assigns a uniform shape descriptor to each feature and therefore allows a more intuitive user interface for the assignment of optical properties. By using the proposed technique, it becomes for instance possible to distinguish blobby heart structures filled with contrast agents from potentially occluding vessels and rib bones. After introducing the basic concepts, we show how the presented technique performs on real world data, and we discuss current limitations.

关键词： Transfer functions visualization Shape User interfaces computer graphics Bones Multidimensional systems Rough surfaces Surface roughness Heart

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AVIGLE: A system of systems concept for an avionic digital service platform based on Micro Unmanned Aerial Vehicles

AVIGLE: A system of systems concept for an avionic digital s...

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IEEE International Conference on Systems, Man and Cybernetics

作者： Sebastian Rohde Niklas Goddemeier Christian Wietfeld Frank Steinicke Klaus Hinrichs Tobias Ostermann Johanna Holsten Dieter Moormann TU Dortmund University Communication Networks Dortmund Germany Visualization and Computer Graphics WWU Münster Munster Germany Dieter Moormann RWTH Aachen University Aachen Germany WWU Münster Visualization and Computer Graphics Münster Germany RWTH Aachen University Flight Dynamics Aachen Germany Communication Networks Technical University Dortmund Dortmund Germany

Miniaturized unmanned flying robots, also referred to as MUAVs (Micro Unmanned Aerial Vehicles) open up completely new fields of innovative applications in the areas of civil security, cellular networks, surveying, entertainment and media. The AVIGLE project is based on the vision of a novel, widely applicable avionic service platform which supports multiple high-tech services by using open interfaces. Recent developments in the area of lithium polymer batteries and carbon fiber-reinforced plastic materials let MUAVs become an aerial platform, that can be equipped with a variety of sensors such as image or time of flight (ToF) cameras. Furthermore, it is also possible to mount communication technologies on the platform in order to let the MUAVs work as communication hot spots or relais at places where no cellular networks are available. In this paper we present a system of systems concept of an Unmanned Aerial System working as a service platform for different Concepts of Operations (ConOps).

关键词： Three dimensional displays Relays Robots Vehicle dynamics

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Synchronizing user interactions with multiple parametrized three-dimensional web graphics

Synchronizing user interactions with multiple parametrized t...

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4th International Conference on computer graphics Theory and Applications, GRAPP 2009

作者： Kraus, Martin Computer Graphics and Visualization Group Technische Universität München Boltzmannstrafie 3 85748 Garching Germany

ISBN: (纸本)9789898111678

The synchronization of a single user's interactions with multiple parametrized graphics in a single web page is an important and povverful feature of interactive illustrations. In this work we present an interface to specifv this kind of svnchronization and its implementation in a Java applet for rendering and interacting with three-dimensional web graphics. Our design allovvs authors of web pages to svnchronize the parameters of groups of interactive graphics vvithin a web page by specifying identical text labels for all applets of the same group. Further labels may be specified to svnchronize changes of the vievvpoints and/or of the magnification. This design allovvs for multiple, independently svnchronized groups of graphics on the same web page as well as any combination of svnchronized parameters, vievvpoints and magnification factors. Only three additional applet parameters are necessary, vvhich are not restricted by any syntax.

关键词： Websites

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The pull-push algorithm revisited: Improvements,computation of point densities,and GPU implementation

The pull-push algorithm revisited: Improvements,computation ...

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4th International Conference on computer graphics Theory and Applications, GRAPP 2009

作者： Kraus, Martin Computer Graphics and Visualization Group Technische Universität München Boltzmannstrae 3 85748 Garching Germany

ISBN: (纸本)9789898111678

The pull-push algorithm is a well-known and very efficient pyramid algorithm for the interpolation of scattered data with many applications in computer ***,the original algorithm is not very well suited for an implementation on GPUs (graphics processing units).In this work,several improvements of the algorithm are presented to overcome this limitalion,and important details of the algorithm are clarified,in particular the importance of the correct normalization of the employed ***,we present an extension for a very efficient estimate of the local density of sample points.

关键词： graphics processing unit

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Transitional environments enhance distance perception in immersive virtual reality systems 09

Transitional environments enhance distance perception in imm...

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APGV 2009: Symposium on Applied Perception in graphics and visualization

作者： Steinicke, Frank Bruder, Gerd Hinrichs, Klaus Lappe, Markus Ries, Brian Interrante, Victoria Visualization and Computer Graphics Research Group Germany Psychology Department II University of Münster Germany Department of Computer Science and Engineering University of Minnesota United States

ISBN: (纸本)9781605587431

Several experiments have provided evidence that ego-centric distances are perceived as compressed in immersive virtual environments relative to the real world. The principal factors responsible for this phenomenon have remained largely unknown. However, recent experiments suggest that when the virtual environment (VE) is an exact replica of a user's real physical surroundings, the person's distance perception improves. Furthermore, it has been shown that when users start their virtual reality (VR) experience in such a virtual replica and then gradually transition to a different VE, their sense of presence in the actual virtual world increases significantly. In this case the virtual replica serves as a transitional environment between the real and virtual world. In this paper we examine whether a person's distance estimation skills can be transferred from a transitional environment to a different VE. We have conducted blind walking experiments to analyze if starting the VR experience in a transitional environment can improve a person's ability to estimate distances in an immersive VR system. We found that users significantly improve their distance estimation skills when they enter the virtual world via a transitional environment. © 2009 ACM.

关键词： Virtual reality

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Presence-enhancing real walking user interface for first-person video games

Presence-enhancing real walking user interface for first-per...

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2009 ACM SIGGRAPH Symposium on Video Games, Sandbox '09

作者： Steinicke, Frank Bruder, Gerd Hinrichs, Klaus Steed, Anthony Visualization and Computer Graphics Research Group Department of Computer Science University of Munster Einsteinstraße 62 48149 Munster Germany Virtual Environments and Computer Graphics Group Department of Computer Science University College London Gower Street London WC1E 6BT United Kingdom

ISBN: (纸本)9781605585147

For most first-person video games it is important that players have a high level of feeling presence in the displayed game environment. Virtual reality (VR) technologies have enormous potential to enhance gameplay since players can experience the game immersively from the perspective of the player's virtual character. However, the VR technology itself, such as tracking devices and cabling, has until recently restricted the ability of users to really walk over long distances. In this paper we introduce a VR-based user interface for presence-enhancing gameplay with which players can explore the game environment in the most natural way, i. e., by real walking. While the player walks through the virtual game environment, we guide him/her on a physical path which is different from the virtual path and fits into the VR laboratory space. In order to further increase the VR experience, we introduce the concept of transitional environments. Such a transitional environment is a virtual replica of the laboratory environment, where the VR experience starts and which enables a gradual transition to the game environment. We have quantified how much humans can unknowingly be redirected and whether or not a gradual transition to a first-person game via a transitional environment increases the user's sense of presence. © 2009 ACM.

关键词： Virtual reality

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Advanced illumination techniques for GPU-based volume raycasting 09

Advanced illumination techniques for GPU-based volume raycas...

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ACM SIGGRAPH 2009 Courses, SIGGRAPH '09

作者： Hadwiger, Markus Ljung, Patric Salama, Christof Rezk Ropinski, Timo VRVis Research Center for Virtual Reality and Visualization Donau-City-Straße 1 A-1220 Vienna Austria Siemens Corporate Research Imaging and Visualization Department 755 College Road East Princeton NJ 08540 United States Computer Graphics Group University of Siegen Hölderlinstr. 3 57068 Siegen Germany Visualization and Computer Graphics Research Group University of Münster Einsteinstr. 62 48149 Münster Germany

ISBN: (纸本)9781450379380

Volume raycasting techniques are important for both visual arts and visualization. They allow efficient generation of visual effects and visualization of scientific data obtained by tomography or numerical simulation. Volume-rendering techniques are also effective for direct rendering of implicit surfaces used for soft-body animation and constructive solid geometry. The focus of this course is on volumetric illumination techniques that approximate physically based light transport in participating media. Such techniques include interactive implementation of soft and hard shadows, ambient occlusion, and simple Monte Carlo-based approaches to global illumination, including translucency and scattering.

关键词： visualization

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Judgment of natural perspective projections in head-mounted display environments 09

Judgment of natural perspective projections in head-mounted ...

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VRST 2009 - 16th ACM Symposium on Virtual Reality Software and Technology

作者： Steinicke, Frank Bruder, Gerd Hinrichs, Klaus Lappe, Markus Kuhl, Scott Willemsen, Pete Visualization and Computer Graphics Research Group Department of Computer Science University of Münster Germany Psychology Department II University of Münster Germany Department of Computer Science Michigan Technological University United States Department of Computer Science University of Minnesota Duluth United States

ISBN: (纸本)9781605588698

The display units integrated in todays head-mounted displays (HMDs) provide only a limited field of view (FOV) to the virtual world. In order to present an undistorted view to the virtual environment (VE), the perspective projection used to render the VE has to be adjusted to the limitations caused by the HMD characteristics. In particular, the geometric field of view (GFOV), which defines the virtual aperture angle used for rendering of the 3D scene, is set up according to the display's field of view. A discrepancy between these two fields of view distorts the geometry of the VE in a way that either minifies or magnifies the imagery displayed to the user. Discrepancies between the geometric and physical FOV causes the imagery to be minified or magnified. This distortion has the potential to negatively or positively affect a user's perception of the virtual space, sense of presence, and performance on visual search tasks. In this paper we analyze if a user is consciously aware of perspective distortions of the VE displayed in the HMD. We introduce a psychophysical calibration method to determine the HMD's actual field of view, which may vary from the nominal values specified by the manufacturer. Furthermore, we conducted an experiment to identify perspective projections for HMDs which are identified as natural by subjects-even if these perspectives deviate from the perspectives that are inherently defined by the display's field of view. We found that subjects evaluate a field of view as natural when it is larger than the actual field of view of the HMD-in some cases up to 50%. Copyright © 2009 by the Association for Computing Machinery, Inc.

关键词： Virtual reality

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Arch-Explore: A natural user interface for immersive architectural walkthroughs

Arch-Explore: A natural user interface for immersive archite...

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IEEE Symposium on 3D User Interfaces (3DUI)

作者： Gerd Bruder Frank Steinicke Klaus H. Hinrichs Visualization and Computer Graphics (VisCG) Research Group Department of Computer Science University of Münster Munster Germany

In this paper we propose the Arch-Explore user interface, which supports natural exploration of architectural 3D models at different scales in a real walking virtual reality (VR) environment such as head-mounted display (HMD) or CAVE setups. We discuss in detail how user movements can be transferred to the virtual world to enable walking through virtual indoor environments. To overcome the limited interaction space in small VR laboratory setups, we have implemented redirected walking techniques to support natural exploration of comparably large-scale virtual models. Furthermore, the concept of virtual portals provides a means to cover long distances intuitively within architectural models. We describe the software and hardware setup and discuss benefits of Arch-Explore.

关键词： User interfaces Legged locomotion Virtual reality computer graphics Indoor environments Laboratories Hardware Virtual environment Haptic interfaces Feedback

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Cross-talk measurement for 3D dispalays

Cross-talk measurement for 3D dispalays

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3DTV Conference

作者： Vaclav Skala Center of Computer Graphics and Visualization Faculty of Applied Sciences Department of Computer Science and Engineering University of West Bohemia Plzen Czech Republic

3D displays are coming phenomenon of the nearest future and it is expected that 3D displays will be widely available soon. There are currently some 3D displays available and also some notebooks with 3D display as Sharp AL3D. The viewing position is quite restricted spatially in the case of 3D displays and also the (visual information for the left eye is taken by the right eye and vice versa) causes some severe problems in 3D image perception. This paper addresses several issues concerning 3D perception based on stereo-images. Another issues related to 3D stereo video perception, like discontinuities between frames etc. are not described here.

关键词： Three dimensional displays Testing visualization Cameras Optical distortion computer aided manufacturing CADCAM Geographic Information Systems Chromium Frequency

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