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Displaying 1-25 out of 25 total
Tensor Visualization Driven Mechanical Component Design
Found in: 2014 IEEE Pacific Visualization Symposium (PacificVis)
By Andrea Kratz,Marc Schoeneich,Valentin Zobel,Bernhard Burgeth,Gerik Scheuermann,Ingrid Hotz,Markus Stommel
Issue Date:March 2014
pp. 145-152
This paper is the result of a close collaboration of mechanical engineers and visualization researchers. It showcases how interdisciplinary work can lead to new insight and progress in both fields. Our case is concerned with one step in the product develop...
 
Anisotropic Sampling of Planar and Two-Manifold Domains for Texture Generation and Glyph Distribution
Found in: IEEE Transactions on Visualization and Computer Graphics
By A. Kratz,D. Baum,I. Hotz
Issue Date:November 2013
pp. 1782-1794
We present a new method for the generation of anisotropic sample distributions on planar and two-manifold domains. Most previous work that is concerned with aperiodic point distributions is designed for isotropically shaped samples. Methods focusing on ani...
 
Tracking Pedestrians Using Local Spatio-Temporal Motion Patterns in Extremely Crowded Scenes
Found in: IEEE Transactions on Pattern Analysis and Machine Intelligence
By L. Kratz,K. Nishino
Issue Date:May 2012
pp. 987-1002
Tracking pedestrians is a vital component of many computer vision applications, including surveillance, scene understanding, and behavior analysis. Videos of crowded scenes present significant challenges to tracking due to the large number of pedestrians a...
 
An automatic version of a reading disorder test
Found in: ACM Transactions on Speech and Language Processing (TSLP)
By Andreas Maier, Elisabeth Sauerhofer, Elmar Noth, Flonan Honig, Gunther Moll, Oliver Kratz, Stefan Steidl, Stefanie Horndasch
Issue Date:August 2011
pp. 1-15
We present a novel system to automatically diagnose reading disorders. The system is based on a speech recognition engine with a module for prosodic analysis. The reading disorder test is based on eight different subtests. In each of the subtests, the syst...
     
CapWidgets: tangile widgets versus multi-touch controls on mobile devices
Found in: Proceedings of the 2011 annual conference extended abstracts on Human factors in computing systems (CHI EA '11)
By Georg Essl, Michael Rohs, Sven Kratz, Tilo Westermann
Issue Date:May 2011
pp. 1351-1356
We present CapWidgets, passive tangible controls for capacitive touch screens. CapWidgets bring back physical controls to off-the-shelf multi-touch surfaces as found in mobile phones and tablet computers. While the user touches the widget, the surface dete...
     
Real-time nonverbal opinion sharing through mobile phones during sports events
Found in: Proceedings of the 2011 annual conference on Human factors in computing systems (CHI '11)
By Albrecht Schmidt, Alexander Muller, Alireza Sahami Shirazi, Michael Rohs, Robert Schleicher, Sven Kratz
Issue Date:May 2011
pp. 307-310
Even with the rise of the World Wide Web, TV has remained the most pervasive entertainment medium and is nowadays often used together with other media, which allow for active participation. The idea of connecting non-collocated TV viewers via telecommunica...
     
Semi-automatic zooming for mobile map navigation
Found in: Proceedings of the 12th international conference on Human computer interaction with mobile devices and services (MobileHCI '10)
By Ivo Brodien, Michael Rohs, Sven Kratz
Issue Date:September 2010
pp. 63-72
In this paper we present a novel interface for mobile map navigation based on Semi-Automatic Zooming (SAZ). SAZ gives the user the ability to manually control the zoom level of an SDAZ interface, while retaining the automatic zooming characteristics of tha...
     
Tracking with local spatio-temporal motion patterns in extremely crowded scenes
Found in: Computer Vision and Pattern Recognition, IEEE Computer Society Conference on
By Louis Kratz, Ko Nishino
Issue Date:June 2010
pp. 693-700
Tracking individuals in extremely crowded scenes is a challenging task, primarily due to the motion and appearance variability produced by the large number of people within the scene. The individual pedestrians, however, collectively form a crowd that exhi...
 
Characteristics of pressure-based input for mobile devices
Found in: Proceedings of the 28th international conference on Human factors in computing systems (CHI '10)
By Craig Stewart, Georg Essl, Michael Rohs, Sven Kratz
Issue Date:April 2010
pp. 801-810
We conducted a series of user studies to understand and clarify the fundamental characteristics of pressure in user interfaces for mobile devices. We seek to provide insight to clarify a longstanding discussion on mapping functions for pressure input. Prev...
     
Extending the virtual trackball metaphor to rear touch input
Found in: 3D User Interfaces
By Sven Kratz, Michael Rohs
Issue Date:March 2010
pp. 111-114
Interaction with 3D objects and scenes is becoming increasingly important on mobile devices. We explore 3D object rotation as a fundamental interaction task. We propose an extension of the virtual trackball metaphor, which is typically restricted to a half...
 
The $3 recognizer: simple 3D gesture recognition on mobile devices
Found in: Proceeding of the 14th international conference on Intelligent user interfaces (IUI '10)
By Michael Rohs, Sven Kratz
Issue Date:February 2010
pp. 419-420
We present the $3 Gesture Recognizer, a simple but robust gesture recognition system for input devices featuring 3D acceleration sensors. The algorithm is designed to be implemented quickly in prototyping environments, is intended to be device-independent ...
     
A $3 gesture recognizer: simple gesture recognition for devices equipped with 3D acceleration sensors
Found in: Proceeding of the 14th international conference on Intelligent user interfaces (IUI '10)
By Michael Rohs, Sven Kratz
Issue Date:February 2010
pp. 341-344
We present the $3 Gesture Recognizer, a simple but robust gesture recognition system for input devices featuring 3D acceleration sensors. The algorithm is designed to be implemented quickly in prototyping environments, is intended to be device-independent ...
     
Hoverflow: exploring around-device interaction with IR distance sensors
Found in: Proceedings of the 11th International Conference on Human-Computer Interaction with Mobile Devices and Services (MobileHCI '09)
By Michael Rohs, Sven Kratz
Issue Date:September 2009
pp. 1-4
By equipping a mobile device with distance sensing capabilities, we aim to expand the interaction possibilities of mobile and wearable devices beyond the confines of the physical device itself to include the space immediately around it. Our prototype, an A...
     
HoverFlow: expanding the design space of around-device interaction
Found in: Proceedings of the 11th International Conference on Human-Computer Interaction with Mobile Devices and Services (MobileHCI '09)
By Michael Rohs, Sven Kratz
Issue Date:September 2009
pp. 1-8
In this paper we explore the design space of around-device interaction (ADI). This approach seeks to expand the interaction possibilities of mobile and wearable devices beyond the confines of the physical device itself to include the space around it. This ...
     
Anomaly detection in extremely crowded scenes using spatio-temporal motion pattern models
Found in: Computer Vision and Pattern Recognition, IEEE Computer Society Conference on
By L. Kratz, K. Nishino
Issue Date:June 2009
pp. 1446-1453
Extremely crowded scenes present unique challenges to video analysis that cannot be addressed with conventional approaches. We present a novel statistical framework for modeling the local spatio-temporal motion pattern behavior of extremely crowded scenes....
 
Map torchlight: a mobile augmented reality camera projector unit
Found in: Proceedings of the 27th international conference extended abstracts on Human factors in computing systems (CHI EA '09)
By Antonio Kruger, Johannes Schoning, Markus Lochtefeld, Michael Rohs, Sven Kratz
Issue Date:April 2009
pp. 1-4
The advantages of paper-based maps have been utilized in the field of mobile Augmented Reality (AR) in the last few years. Traditional paper-based maps provide high-resolution, large-scale information with zero power consumption. There are numerous impleme...
     
Unravelling seams: improvoing mobile gesture recognition with visual feedback techniques
Found in: Proceedings of the 27th international conference on Human factors in computing systems (CHI '09)
By Raphael Ballagas, Sven Kratz
Issue Date:April 2009
pp. 1-4
Gesture recognition is emerging as an engaging interaction technique in mobile scenarios, and high recognition rates promote user acceptance. Several factors influence recognition rates including the nature of the gesture set and the suitability of the ges...
     
REXplorer: a mobile, pervasive spell-casting game for tourists
Found in: CHI '07 extended abstracts on Human factors in computing systems (CHI '07)
By Claudia O. Fuhr, Eugen Yu, Jan Borchers, Ludger Hovestadt, Martin Tann, Rafael A. Ballagas, Steffen P. Walz, Sven G. Kratz
Issue Date:April 2007
pp. 1929-1934
REXplorer is a mobile, pervasive spell-casting game designed for tourists of Regensburg, Germany. The game uses location sensing to create player encounters with spirits (historical figures) that are associated with historical buildings in an urban setting...
     
Biologically Inspired Reflex Based Stabilization Control of a Humanoid Robot with Artificial SMA Muscles
Found in: Robotics and Biomimetics, IEEE International Conference on
By Robert Kratz, Sebastian Klug, Maximilian Stelzer, Oskar von Stryk
Issue Date:December 2006
pp. 1089-1094
Suddenly occurring collisions or unintentional motions represent a high safety risk in robotics and must be prevented. Especially for humanoid robots, the influence of disturbances that occur unexpectedly during bipedal locomotion are difficult to compensa...
 
GPU-accelerated deep shadow maps for direct volume rendering
Found in: Proceedings of the 21st ACM SIGGRAPH/Eurographics symposium on Graphics hardware (GH '06)
By Andrea Kratz, Christian Sigg, Katja Buhler, Markus Hadwiger
Issue Date:September 2006
pp. 49-52
Deep shadow maps unify the computation of volumetric and geometric shadows. For each pixel in the shadow map, a fractional visibility function is sampled, pre-filtered, and compressed as a piecewise linear function. However, the original implementation tar...
     
Cross-Language Program Analysis and Refactoring
Found in: Source Code Analysis and Manipulation, IEEE International Workshop on
By Dennis Strein, Hans Kratz, Welf Löwe
Issue Date:September 2006
pp. 207-216
Many software systems are mixed-language systems today, i.e., they bind together components defined in different programming and specification languages. Analyses and refactorings implemented in current software development tools, e.g., integrated developm...
 
Using Web Services to Promote Integration of Mobile Applications in Distance Learning Domain
Found in: Next Generation Web Services Practices, International Conference on
By Marcelo Scopel, Sérgio Crespo C. S. Pinto, Ricardo A. Kratz
Issue Date:August 2005
pp. 443-444
Joining mobility and learning environments to provide a great flexibility and reuse are main goals to educational software developers. Those requirements allow the user to deal with a lot of learning objects anytime and anywhere in simple handhelds. The in...
   
Adequacy Factory: A WS Agent for Courseware Adequacy to Re-Useable Learning Objects (SCORM)
Found in: Next Generation Web Services Practices, International Conference on
By Ricardo de Andrade Kratz, Sérgio Crespo C. S. Pinto, Marcelo Scopel
Issue Date:August 2005
pp. 406-411
The learning object (courseware) reveals one of the most important elements of the educational process that needs care in its conception, production, development and creation, turning this process in a relatively onerous and complex activity. Promoting and...
 
The Importance of Distributed, Component-Based Healthcare Information Systems: The Role of a Service-Based Architecture
Found in: Computer-Based Medical Systems, IEEE Symposium on
By David W. Forslund, James E. George, Sascha Koenig, Torsten Staab, Mary Kratz, Robert Carter
Issue Date:March 2001
pp. 0079
Introduction: The high cost of healthcare information systems (HIS) is driven by a number of factors. Proprietary systems drive the cost of interchanging data much higher than if the systems implemented standard interfaces, by not being able to leverage co...
 
A Microprogrammed Approach to Signal Processing
Found in: IEEE Transactions on Computers
By G.L. Kratz, W.W. Sproul, E.T. Walendziewicz
Issue Date:August 1974
pp. 808-817
This paper provides a summary of the design features of a microprogram controlled high speed signal processor referred to as an analyzer unit (AU). It provides an overview of the interrelationship between processing requirements, a language structure in wh...
 
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