Sven Kratz

Research Assistant, PhD Student

Mail	sven.kratz ät ifi.lmu.de
Phone	+49-89/2180-4619
Fax	+49-89/2180-4652
Address	Sven Kratz Universität München, LFE Medieninformatik Amalienstr. 17 80333 München Germany
Room	A206 (2nd floor)

Since October 2012, Sven is a research scientist at FX Palo Alto Laboratory, USA.

Sven Kratz was an assistant at the Mobile Interaction Lab of the Department for Informatics of the University of Munich (LMU), Germany, where he obtained his PhD in Computer Science in 2012. From 2008–2011, Sven worked as a researcher and PhD student for Deutsche Telekom Laboratories at the Berlin University of Technology (TU Berlin). Sven completed a 16 week internship in 2010 as well as a 12 week internship in 2011 at the Microsoft Applied Sciences Group in Redmond, WA, USA, where he helped to develop new user interface hardware, experimented with mobile robots and was software developer on the Mayhem team.

Sven’s primary research focus is on sensor-based mobile interfaces that allow for novel types of interaction. This includes gesture recognition, interaction based on distance sensing and pressure, and around-device interaction. Sven also conducts research tabletop applications for mobile devices and associated tracking technologies. Sven received his Diplom degree in Computer Science from RWTH Aachen University in 2007.

In his free time, Sven enjoys playing tennis, sailing and hiking.

Professional Services

Organizer. Workshop Body, Movement, Gestures & Tactility in Interaction with Mobile Devices at Mobile HCI 2011 , Stockholm, Sweden, August 30, 2011

Projects

PalmSpace

What if mobile phones were equipped with depth imaging cameras? PalmSpace envisions the use of such cameras to facilitate interaction with 3D content using hand gestures. We developed a technique that maps the pose of the user's palm directly to 3D object rotation. Our user study shows that the users could manipulate the 3D objects significantly faster than with a standard virtual trackball on the touch screen. To appear at Advanced Visual Interfaces (AVI) 2012, Capri Island, Italy, May 21-25, 2012.

CapWidgets

The CapWidgets project is an exploration of tangible widgets on mobile devices with capacitive touch screens. Presented as a work-in-progress at CHI 2011 in Vancouver, BC, Canada.

Protractor3D

Protractor3D is a tilt-invariant gesture recognizer for 3D motion gestures from data which can be obtained, for example, from 3D accelerometers on smart phones.

Our public evaluation version has been released as a Python module und GPL v3. We intend to release versions of Protractor3D for iPhone and Android in the near future.

Supervised Diplom / Master's / Bachelor's Thesis / Study Projects

In-Air Input Techniques for Smartphones through Shoe-Based Sensing: Philipp Sessler (bachelor's thesis)
Attjector: Design and Analysis of and Attention-Following Wearable Micro-Projector:
- Hardware Engineering: Felix Reitberger (project thesis)
- Computer Vision and Demo Application: Jörg Moldenhauer (diploma thesis)
Understanding Mobile Augmented Reality Pointing : Johannes Senner (diploma thesis)
Flick-and-Zoom: Improving the Usability of Speed-Dependent Automatic Zooming for Map Navigation on Mobile Devices, pdf: Valerie Kroner (project thesis)
ChocTruder: a 3D printer for chocolate: Bernhard "Hotkey" Slawik (diploma thesis)
An Evaluation Environment for Mobile Gestural Interaction, pdf : Dmytro Rytchenkov (diploma thesis)

Publications

2012
	Sven Kratz, Michael Rohs, Felix Reitberger, Jörg Moldenhauer Attjector: an Attention-Following Mobile Projector Kinect Workshop at Pervasive 2012 (bib)
Download	Sven Kratz, Dennis Guse, Michael Rohs, Jörg Müller, Gilles Bailly, Michael Nischt PalmSpace: Continuous Around-Device Gestures vs. Multitouch for 3D Rotation Tasks on Mobile Devices Advanced Visual Interfaces, International Working Conferencein cooperation with ACM-SIGCHI, ACM-SIGMM, SIGCHI Italy, Capri Island (Naples), Italy May 21-25, 2012 (bib)
	Gilles Bailly, Jörg Müller, Michael Rohs, Daniel Wigdor, Sven Kratz ShoeSense: A New Perspective on Gestural Interaction and Wearable Applications Accepted for CHI 2012 (bib)
2011
	Qian Qin, Michael Rohs, Sven Kratz Dynamic ambient lighting for mobile devices UIST '11 Adjunct Proceedings of the 24th annual ACM symposium adjunct on User interface software and technology (bib)
	Christine Kuehnel, Tilo Westermann, Fabian Hemmert, Sven Kratz, Alexander Müller, Sebastian Moeller I'm home: Defining and evaluating a gesture set for smart-home control International Journal of Human-Computer Studies, 693-704 (bib)
	Dennis Guse, Niklas Kirschnick, Sven Kratz, Sebastian Moeller Gesture-based User Authentication for Mobile Devices Workshop on Body, Movement, Gesture and Tactility in Interaction with Mobile Devices at MobileHCI 2011 (bib)
Download	Doris Hausen, Bettina Conradi, Alina Hang, Fabian Hennecke, Sven Kratz, Sebastian Loehmann, Hendrik Richter, Andreas Butz, Heinrich Hussmann Ubiquitous Computing Media Informatics Advanced Seminar, Summer Term 2011 (bib)
	Niklas Kirschnick, Sven Kratz, Sebastian Moeller Poster: Usability of Gesture-based Authentication 2011 Symposium On Usable Privacy and Security (SOUPS 2011) (bib)
	Sven Kratz, Tilo Westermann, Michael Rohs, Georg Essl CapWidgets: Tangible Widgets versus Multi-Touch Controls on Mobile Devices Work in Progress, CHI 2011, Vancouver, Canada, May 7-12, 2011. (bib)
	Alireza Sahami, Michael Rohs, Robert Schleicher, Sven Kratz, Alexander Müller, Albrecht Schmidt Real-Time Nonverbal Opinion Sharing through Mobile Phones during Sports Events Proceedings of CHI 2011, Vancouver, Canada, May 7-12, 2011. Note. (bib)
Download	Sven Kratz, Michael Rohs Protractor3D: A Closed-Form Solution to Rotation-Invariant 3D Gestures Proceedings of the International Conference on Intelligent User Interfaces (IUI 2011), Palo Alto, CA, USA, February 13-16, 2011. Short paper. (bib)
Download	Sven Kratz, Michael Rohs Protractor3D: A Closed-Form Solution to Rotation-Invariant 3D Gestures Proceedings of the International Conference on Intelligent User Interfaces (IUI 2011), Palo Alto, CA, USA, February 13-16, 2011. Short paper. (bib)
2010
Download	Michael Rohs, Sven Kratz, Robert Schleicher, Alireza Sahami, Albrecht Schmidt WorldCupinion: Experiences with an Android App for Real-Time Opinion Sharing during World Cup Soccer Games Research in the Large: Using App Stores, Markets and other wide distribution channels in UbiComp research. Workshop at Ubicomp 2010, Copenhagen, Denmark, September 26, 2010. (bib)
Download	Benjamin Bähr, Sven Kratz, Michael Rohs A Tabletop System for supporting Paper Prototyping of Mobile Interfaces PaperComp 2010: 1st International Workshop on Paper Computing. Workshop at Ubicomp 2010, Copenhagen, Denmark, September 26, 2010. (bib)
Download	Sven Kratz, Ivo Brodien, Michael Rohs Semi-Automatic Zooming for Mobile Map Navigation Proceedings of the 11th International Conference on Human Computer Interaction with Mobile Devices and Services (MobileHCI 2010), Lisboa, Portugal, September 7-10, 2010. (bib)
Download	Georg Essl, Michael Rohs, Sven Kratz Use the Force (or something) - Pressure and Pressure-Like Input for Mobile Music Performance Proceedings of the International Conference on New Interfaces for Musical Expression (NIME 2010), Sydney, Australia, June 15-18 2010. Short paper. (bib)
Download	Craig Stewart, Michael Rohs, Georg Essl, Sven Kratz Characteristics of Pressure-Based Input for Mobile Devices Proceedings of the ACM Conference on Human Factors in Computing Systems (CHI 2010), Atlanta, Georgia, USA, April 10-15, 2010. Full paper. (bib)
Download	Sven Kratz, Fabian Hemmert, Michael Rohs Natural User Interfaces in Mobile Phone Interaction Workshop on Natural User Interfaces at CHI 2010, Atlanta, Georgia, USA, April 10, 2010. (bib)
Download	Sven Kratz, Michael Rohs Extending the Virtual Trackball Metaphor to Rear Touch Input Proceedings of the IEEE Symposium on 3D User Interfaces (3DUI 2010), Waltham, Massachusetts, USA, March 20-21, 2010. Tech note. (bib)
Download	Sven Kratz, Michael Rohs $3 Gesture Recognizer: Simple Gesture Recognition for Devices Equipped with 3D Acceleration Sensors Proceedings of the International Conference on Intelligent User Interfaces (IUI 2010), Hong Kong, China, February 7-10, 2010. Short paper. (bib)
2009
Download	Georg Essl, Michael Rohs, Sven Kratz Squeezing the Sandwich: A Mobile Pressure-Sensitive Two-Sided Multi-Touch Prototype Demonstration at the 22nd Annual ACM Symposium on User Interface Software and Technology (UIST), Victoria, BC, Canada. (bib)
Download	Sven Kratz, Michael Rohs HoverFlow: Expanding the Design Space of Around-Device Interaction 10th International Conference on Human Computer Interaction with Mobile Devices and Services (MobileHCI), Bonn, Germany, September 15-18, 2009. Full paper. (bib)
	Chris Kray, Michael Rohs, Jonathan Hook, Sven Kratz Bridging the Gap between the Kodak and the Flickr Generations: A Novel Interaction Technique for Collocated Photo Sharing International Journal on Human-Computer Studies (IJHCS), September 2009. (bib)
	Johannes Schöning, Michael Rohs, Sven Kratz, Markus Löchtefeld, Antonio Krüger Map Torchlight: A Mobile Augmented Reality Camera Projector Unit CHI 2009, Work in Progress, pp. 3841-3846, Bosten, MA, USA, April, 4-9, 2009. (bib)
Download	Sven Kratz, Michael Rohs Unobtrusive Tabletops: Linking Personal Devices with Regular Tables Workshop on Multitouch and Surface Computing at CHI '09, Boston, MA, USA, April 4, 2009. (bib)
2008
Download	Chris Kray, Michael Rohs, Jonathan Hook, Sven Kratz Group Coordination and Negotiation through Spatial Proximity Regions around Mobile Devices on Augmented Tabletops 3rd IEEE Workshop on Tabletops and Interactive Surfaces (IEEE Tabletop 2008) (bib)
Download	Sven Kratz, Michael Rohs Navigating Dynamically-Generated High Quality Maps on Tilt-Sensing Mobile Devices Workshop on Mobile and Embedded Interactive Systems (MEIS at Informatik 2008), Munich, Germany, September 11, 2008 (bib)