Publication statistics

Pub. period:2008-2012
Pub. count:13
Number of co-authors:19



Co-authors

Number of publications with 3 favourite co-authors:

Jan Borchers:11
Moritz Wittenhagen:5
Florian Heller:3

 

 

Productive colleagues

Thorsten Karrer's 3 most productive colleagues in number of publications:

Jan Borchers:38
Bjrn Hartmann:27
Jan O. Borchers:13
 
 
 

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Thorsten Karrer

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Publications by Thorsten Karrer (bibliography)

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2012
 
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Walther-Franks, Benjamin, Herrlich, Marc, Karrer, Thorsten, Wittenhagen, Moritz, Schrder-Kroll, Roland, Malaka, Rainer and Borchers, Jan (2012): Dragimation: direct manipulation keyframe timing for performance-based animation. In: Proceedings of the 2012 Conference on Graphics Interface 2012. pp. 101-108.

Getting the timing and dynamics right is key to creating believable and interesting animations. However, using traditional keyframe animation techniques, timing is a tedious and abstract process. In this paper we present Dragimation, a novel technique for interactive performative timing of keyframe animations. It is inspired by direct manipulation techniques for video navigation that leverage the natural sense of timing all of us possess. We conducted a user study with 27 participants including professional animators as well as novices, in which we compared our approach to two other interactive timing techniques, timeline scrubbing and sketch-based timing. Dragimation is comparable regarding objective error measurements to the sketch-based approach and significantly better than scrubbing and is the overall preferred technique by our test users.

© All rights reserved Walther-Franks et al. and/or their publisher

2011
 
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Karrer, Thorsten, Wittenhagen, Moritz, Lichtschlag, Leonhard, Heller, Florian and Borchers, Jan (2011): Pinstripe: eyes-free continuous input on interactive clothing. In: Proceedings of ACM CHI 2011 Conference on Human Factors in Computing Systems 2011. pp. 1313-1322.

We present Pinstripe, a textile user interface element for eyes-free, continuous value input on smart garments that uses pinching and rolling a piece of cloth between your fingers. The input granularity can be controlled in a natural way by varying the amount of cloth pinched. Pinstripe input elements physically consist of fields of parallel conductive lines sewn onto the fabric. This way, they can be invisible, and can be included across large areas of a garment. Pinstripe also addresses several problems previously identified in the placement and operation of textile UI elements on smart clothing. Two user studies evaluate ideal placement and orientation of Pinstripe elements on the users' garments as well as acceptance and perceived ease of use of this novel textile input technique.

© All rights reserved Karrer et al. and/or their publisher

 
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Jansen, Yvonne, Karrer, Thorsten and Borchers, Jan (2011): MudPad: tactile feedback for touch surfaces. In: Proceedings of ACM CHI 2011 Conference on Human Factors in Computing Systems 2011. pp. 323-328.

MudPad is a system enriching touch surfaces with localized active haptic feedback. A soft and flexible overlay containing magnetorheological fluid is actuated by an array of electromagnets to create a variety of tactile sensations. As each magnet can be controlled individually, we are able to produce feedback in realtime locally at arbitrary points of interaction.

© All rights reserved Jansen et al. and/or their publisher

 
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Heller, Florian, Lichtschlag, Leonhard, Wittenhagen, Moritz, Karrer, Thorsten and Borchers, Jan (2011): Me hates this: exploring different levels of user feedback for (usability) bug reporting. In: Proceedings of ACM CHI 2011 Conference on Human Factors in Computing Systems 2011. pp. 1357-1362.

User feedback for deployed software systems ranges from simple one-bit-feedback to full-blown bug reports. While detailed bug reports are very helpful for the developers to track down problems, the expertise and commitment required from the user is high. We analyzed existing user report systems and propose a flexible and independent hard- and software architecture to collect user feedback. We report our results from a preliminary two-week user study testing the system in the field and discuss challenges and solutions for the collection of multiple levels of user feedback through different modalities.

© All rights reserved Heller et al. and/or their publisher

 
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Karrer, Thorsten, Krmer, Jan-Peter, Diehl, Jonathan, Hartmann, Bjrn and Borchers, Jan (2011): Stacksplorer: call graph navigation helps increasing code maintenance efficiency. In: Proceedings of the 2011 ACM Symposium on User Interface Software and Technology 2011. pp. 217-224.

We present Stacksplorer, a new tool to support source code navigation and comprehension. Stacksplorer computes the call graph of a given piece of code, visualizes relevant parts of it, and allows developers to interactively traverse it. This augments the traditional code editor by offering an additional layer of navigation. Stacksplorer is particularly useful to understand and edit unknown source code because branches of the call graph can be explored and backtracked easily. Visualizing the callers of a method reduces the risk of introducing unintended side effects. In a quantitative study, programmers using Stacksplorer performed three of four software maintenance tasks significantly faster and with higher success rates, and Stacksplorer received a System Usability Scale rating of 85.4 from participants.

© All rights reserved Karrer et al. and/or ACM Press

2010
 
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Mennicken, Sarah, Karrer, Thorsten, Russell, Peter and Borchers, Jan (2010): First-person cooking: a dual-perspective interactive kitchen counter. In: Proceedings of ACM CHI 2010 Conference on Human Factors in Computing Systems 2010. pp. 3403-3408.

Hobby chefs have various ways to learn cooking-paper recipes or cooking shows, for example. However, information in paper recipes may require prior experience to be understood and a television show cannot adapt to a viewer's individual speed. Based on our findings on cooking habits, we are developing PersonalChef to unravel the complexity of recipes in order to increase users' confidence and fun when preparing an unknown recipe. PersonalChef is a multi-display, dual-perspective, interactive kitchen counter to support users in-situ while cooking and to teach them about food preparation. In addition to an interactive "personal chef" on a screen behind the stove, the user can retrieve as much or as little information as needed/wanted using a display embedded in the kitchen counter.

© All rights reserved Mennicken et al. and/or their publisher

 
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Jansen, Yvonne, Karrer, Thorsten and Borchers, Jan (2010): MudPad: localized tactile feedback on touch surfaces. In: Proceedings of the 2010 ACM Symposium on User Interface Software and Technology 2010. pp. 385-386.

We present MudPad, a system that is capable of localized active haptic feedback on multitouch surfaces. An array of electromagnets locally actuates a tablet-sized overlay containing magnetorheological (MR) fluid. The reaction time of the fluid is fast enough for realtime feedback ranging from static levels of surface softness to a broad set of dynamically changeable textures. As each area can be addressed individually, the entire visual interface can be enriched with a multi-touch haptic layer that conveys semantic information as the appropriate counterpart to multi-touch input.

© All rights reserved Jansen et al. and/or their publisher

 
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Karrer, Thorsten, Wittenhagen, Moritz, Heller, Florian and Borchers, Jan (2010): Pinstripe: eyes-free continuous input anywhere on interactive clothing. In: Proceedings of the 2010 ACM Symposium on User Interface Software and Technology 2010. pp. 429-430.

We present Pinstripe, a textile user interface element for eyes-free, continuous value input on smart garments that uses pinching and rolling a piece of cloth between your fingers. Input granularity can be controlled by the amount of cloth pinched. Pinstripe input elements are invisible, and can be included across large areas of a garment. Pinstripe thus addresses several problems previously identified in the placement and operation of textile UI elements on smart clothing.

© All rights reserved Karrer et al. and/or their publisher

 
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Krmer, Jan-Peter, Karrer, Thorsten, Diehl, Jonathan and Borchers, Jan (2010): Stacksplorer: understanding dynamic program behavior. In: Proceedings of the 2010 ACM Symposium on User Interface Software and Technology 2010. pp. 433-434.

To thoroughly comprehend application behavior, programmers need to understand the interactions of objects at runtime. Today, these interactions are often poorly visualized in common IDEs except during debugging. Stacksplorer allows visualizing and traversing potential call stacks in an application even when it is not running by showing callers and called methods in two columns next to the code editor. The relevant information is gathered from the source code automatically.

© All rights reserved Krmer et al. and/or their publisher

2009
 
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Lichtschlag, Leonhard, Karrer, Thorsten and Borchers, Jan (2009): Fly: a tool to author planar presentations. In: Proceedings of ACM CHI 2009 Conference on Human Factors in Computing Systems 2009. pp. 547-556.

Modern presentation software is still built around interaction metaphors adapted from traditional slide projectors. We provide an analysis of the problems in this application genre that presentation authors face and present Fly, a presentation tool that is based on the idea of planar information structures. Inspired by the natural human thought processes of data chunking, association, and spatial memory, Fly explores authoring of presentation documents. Evaluation of a paper prototype showed that the planar UI is easily grasped by users, and leads to presentations more closely resembling the information structure of the original content, thus providing better authoring support than the slide metaphor. Our software prototype confirmed these results, and outperformed PowerPoint in a second study for tasks such as prototyping presentations and generating meaningful overviews. Users reported that this interface helped them better to express their concepts, and expressed significant preference for Fly over the traditional slide model.

© All rights reserved Lichtschlag et al. and/or ACM Press

 
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Karrer, Thorsten, Wittenhagen, Moritz and Borchers, Jan (2009): PocketDRAGON: a direct manipulation video navigation interface for mobile devices. In: Proceedings of 11th Conference on Human-computer interaction with mobile devices and services 2009. p. 47.

We present PocketDRAGON, a demonstrator prototype that allows direct manipulation video navigation on mobile touchscreen devices. In contrast to traditional video navigation techniques, PocketDRAGON does not require any overlay UI elements that occupy valuable screen real estate and obstruct the users' view on the video. Also, direct manipulation video navigation techniques have been shown to compare favorably to the established timeline slider interfaces in terms of performance times, intuitiveness, precision, and perceived ease of use. Our demonstrator system still uses a backend server for the computationally expensive parts of the algorithms but delivers the full-fledged user experience on the mobile device.

© All rights reserved Karrer et al. and/or their publisher

2008
 
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Karrer, Thorsten, Weiss, Malte, Lee, Eric and Borcers, Jan (2008): DRAGON: a direct manipulation interface for frame-accurate in-scene video navigation. In: Proceedings of ACM CHI 2008 Conference on Human Factors in Computing Systems April 5-10, 2008. pp. 247-250.

We present DRAGON, a direct manipulation interaction technique for frame-accurate navigation in video scenes. This technique benefits tasks such as professional and amateur video editing, review of sports footage, and forensic analysis of video scenes. By directly dragging objects in the scene along their movement trajectory, DRAGON enables users to quickly and precisely navigate to a specific point in the video timeline where an object of interest is in a desired location. Examples include the specific frame where a sprinter crosses the finish line, or where a car passes a traffic light. Through a user study, we show that DRAGON significantly reduces task completion time for in-scene navigation tasks by an average of 19-42% compared to a standard timeline slider. Qualitative feedback from users is also positive, with multiple users indicating that the DRAGON interaction felt more natural than the traditional timeline slider for in-scene navigation.

© All rights reserved Karrer et al. and/or ACM Press

 
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Herkenrath, Gero, Karrer, Thorsten and Borchers, Jan O. (2008): Twend: twisting and bending as new interaction gesture in mobile devices. In: Proceedings of ACM CHI 2008 Conference on Human Factors in Computing Systems April 5-10, 2008. pp. 3819-3824.

In this work we present a hardware prototype that uses bending gestures as input for a mobile device and experimental setups that compare possible gestures with other, more traditional input methods in mobile computing. These will eventually result in guidelines for researchers and designers how to build bendable devices and show new interaction metaphors for computer user interfaces.

© All rights reserved Herkenrath et al. and/or ACM Press

 
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Changes to this page (author)

10 Nov 2012: Modified
05 Apr 2012: Modified
05 Jul 2011: Modified
05 Jul 2011: Modified
05 Jul 2011: Modified
03 Nov 2010: Modified
03 Nov 2010: Modified
03 Nov 2010: Modified
02 Nov 2010: Modified
02 Nov 2010: Modified
09 May 2009: Modified
12 May 2008: Added
12 May 2008: Modified

Page Information

Page maintainer: The Editorial Team
URL: http://www.interaction-design.org/references/authors/thorsten_karrer.html

Publication statistics

Pub. period:2008-2012
Pub. count:13
Number of co-authors:19



Co-authors

Number of publications with 3 favourite co-authors:

Jan Borchers:11
Moritz Wittenhagen:5
Florian Heller:3

 

 

Productive colleagues

Thorsten Karrer's 3 most productive colleagues in number of publications:

Jan Borchers:38
Bjrn Hartmann:27
Jan O. Borchers:13
 
 
 

Upcoming Courses

go to course
The Psychology of Online Sales: The Beginner's Guide
Starts tomorrow LAST CALL!
go to course
Human-computer Interaction
86% booked. Starts in 9 days
 
 

Featured chapter

Marc Hassenzahl explains the fascinating concept of User Experience and Experience Design. Commentaries by Don Norman, Eric Reiss, Mark Blythe, and Whitney Hess

User Experience and Experience Design !

 
 

Our Latest Books

 
 
The Social Design of Technical Systems: Building technologies for communities. 2nd Edition
by Brian Whitworth and Adnan Ahmad
start reading
 
 
 
 
Gamification at Work: Designing Engaging Business Software
by Janaki Mythily Kumar and Mario Herger
start reading
 
 
 
 
The Social Design of Technical Systems: Building technologies for communities
by Brian Whitworth and Adnan Ahmad
start reading
 
 
 
 
The Encyclopedia of Human-Computer Interaction, 2nd Ed.
by Mads Soegaard and Rikke Friis Dam
start reading