CHI 2015 in Seoul

The Conference on Human Factors in Computing Systems (CHI) is the premier annual conference in the field of Human-Computer-Interaction. For researchers in our field, it is the most important venue to publish and present their work.

At CHI 2015 in Seoul, our group was represented with a record number of contributions – even more than last year: Overall, our group contributed nine papers/notes and five work-in-progress papers – which puts us at rank 10 of all contributing institutions world-wide, at rank 4 (Europe), and rank 1 (Germany)! We are also very happy to announce that two of our submissions received a „Best Paper Honorable Mention Award“ (top 5% of submissions).


Papers and Notes:
Full papers and notes are the most important submission category of CHI. This year, the acceptance rate was 23%. Our group contributed the following papers:

Emanuel von Zezschwitz, Alexander De Luca, Bruno Brunkow, Heinrich Hussmann
SwiPIN – Fast and Secure PIN-Entry on Smartphones (Video)

Emanuel von Zezschwitz presented SwiPIN, a novel authentication system that allows input of traditional PINs using simple touch gestures like up or down and makes it secure against human observers. SwiPIN performs adequately fast (3.7 s) to serve as an alternative input method for risky situations. Furthermore, SwiPIN is easy to use, significantly more secure against shoulder surfing attacks and switching between PIN and SwiPIN feels natural. The system was recentely featured by Gizmodo.

Emanuel von Zezschwitz, Alexander De Luca, Philipp Janssen, Heinrich Hussmann
Easy to Draw, but Hard to Trace? On the Observability of Grid-based (Un)lock Patterns

We performed a systematic evaluation of the shoulder surfing susceptibility of the Android pattern (un)lock. The results of an online study (n = 298) enabled us to quantify the influence of pattern length, line visibility, number of knight moves, number of overlaps and number of intersections on observation resistance. The results show that all parameters have a highly significant influence, with line visibility and pattern length being most important. At CHI, we discussed implications for real-world patterns and presented a linear regression model that can predict the observability of a given pattern.

Alexander De Luca, Alina Hang, Emanuel von Zezschwitz, Heinrich Hussmann
I Feel Like I’m Taking Selfies All Day! Towards Understanding Biometric Authentication on Smartphones (Honorable Mention)

This paper reports the findings of a study about reasons for (not) using biometric authentication on smartphones. The results indicate that usability is among the main factors in the decision process.

Alina Hang, Alexander De Luca, Michael Richter, Heinrich Hussmann
I Know What You Did Last Week! Do You? Dynamic Security Questions for Fallback Authentication on Smartphones (Honorable Mention)

The paper reports the results of two consecutive user studies on the design of dynamic security questions on smartphones and discusses their usability, security and privacy implications. The work was recentely featured by Gizmodo.

Simon Stusak, Jeannette Schwarz, Andreas Butz
Evaluating the Memorability of Physical Visualizations (Video)

We compared the memorability of physical bar charts to that of digital bar charts by measuring the recall of three types of information immediately after exploration and with a delay of two weeks. The results show that the physical visualizations led to significantly less information decay with this time span..

Daniel Buschek, Alexander De Luca, Florian Alt
Improving Accuracy, Applicability and Usability of Keystroke Biometrics on Mobile Touchscreen Devices

Authentication methods can be improved by considering implicit, individual behavioural cues. In particular, verifying users based on typing behaviour has been widely studied with physical keyboards. On mobile touchscreens, the same concepts have been applied with little adaptations so far. This paper presents the first reported study on mobile keystroke biometrics which compares touch-specific features between three different hand postures and evaluation schemes.

Felix Lauber, Sophia Cook, Andreas Butz
Content Destabilization for Head-Mounted Displays (Video)

With recent progress in display technology, visual see-through head-mounted displays are beginning to enter our everyday lives. Especially in cars they may replace head-up displays, as they can theoretically perfectly imitate them but are more flexible to use. However, prior work has shown that both screen- and vehicle-stabilized content suffer from drawbacks such as occlusion or technological limitations. As a potential alternative, we propose three concept alternatives, in which head rotation is used to manipulate the displayed content differently from both of the known stabilization techniques.


Work-in-Progress Papers:
The Work-in-Progress track allows authors to present their ongoing work in a more concise format. Our five submissions were accepted:

Axel Hoesl, Julie Wagner, Andreas Butz
Delegation Impossible? – Towards Novel Interfaces for Camera Motion

When watching a movie, the viewer perceives camera motion as an integral movement of a viewport in a scene. Behind the scenes, however, there is a complex and error-prone choreography of multiple people controlling separate motion axes and camera attributes. This strict separation of tasks has mostly historical reasons, which we believe could be overcome with today’s technology. We
revisit interface design for camera motion starting with ethnographic observations and interviews with nine camera operators. We identified seven influencing factors for camera work and found that automation needs to be combined with human interaction: Operators want to be able to spontaneously take over in unforeseen situations. We characterize a class of user interfaces supporting (semi-)automated camera motion that take both human and machine capabilities into account by offering seamless
transitions between automation and control.

Sarah Tausch, Fabian Nußberger, Heinrich Hussmann
Supporting the Disney Method with an Interactive Feedback System

In this paper, we present a system that supports groups in using the Disney method, a collaborative creativity technique based on three roles: dreamer, realist and critic. Each group member is provided with a tablet to enter ideas and choose the role in which a contribution is made, represented by different colors. We compared two versions: a baseline without additional support and a version with an additional feedback mechanism providing functional feedback about the distribution of the roles. Our results indicate that functional feedback can help modest group members to engage more in the group process.

Henri Palleis, Mirjam Mickisch, Heinrich Hussmann
A Concept for 3D Interaction on a Curved Touch Display

The handling of 3D content increasingly permeates amateur activities and occurs spontaneously on public displays. The design of interaction techniques for such scenarios is subject to tensions between established expert user interfaces, 3D touch interaction and the requirements of the usage context. We present a novel concept for 3D touch interaction on a curved display targeted at non-expert and spontaneous interaction scenarios. We further present preliminary results from an experiment, during which we compared our interaction technique with an established one for different 3D interaction tasks. The results indicate that for the chosen tasks both techniques perform equally well and point out room for further improvement.

Daniel Buschek, Florian Alt, Michael Spitzer
Video-Recording Your Life: User Perception and Experiences

Video recording is becoming an integral part of our daily activities: Action cams and wearable cameras allow us to capture scenes of our daily life effortlessly. This trend generates vast amounts of video material impossible to review manually. However, these recordings also contain a lot of information potentially interesting to the recording individual and to others. Such videos can  provide a meaningful summary of the day, serving as a digital extension to the user’s human memory. They might also be interesting to others as tutorials (e.g. how to change a flat tyre). As a first step towards this vision, we present a survey assessing the users‘ view and their video recording behavior.

Nora Broy, Stefan Schneegass, Mengbing Guo, Florian Alt, Albrecht Schmidt
Evaluating Stereoscopic 3D for Automotive User Interfaces in a Real-World Driving Study

This paper reports on the use of in-car 3D displays in a real-world driving scenario. Today, stereoscopic displays are becoming ubiquitous in many domains such as mobile phones or TVs. Instead of using 3D for entertainment, we explore the 3D effect as a mean to spatially structure user interface (UI) elements. To evaluate potentials and drawbacks of in-car 3D displays we mounted an autostereoscopic display as instrument cluster in a vehicle and conducted a real-world driving study with 15 experts in automotive UI design. The results show that the 3D effect increases the perceived quality of the UI and enhances the presentation of spatial information (e.g., navigation cues) compared to 2D. However, the eect should be used well-considered to avoid spatial clutter which can increase the system’s complexity.


The following papers were submitted in cooperation with other research groups:

Max Pfeiffer, Tim Duente, Stefan Schneegass, Florian Alt, Michael Rohs
Cruise Control for Pedestrians: Controlling Walking Direction using Electrical Muscle Stimulation (Best Paper Award)

Pedestrian navigation systems require users to perceive, interpret, and react to navigation information. This can tax cognition as navigation information competes with information from the real world. We propose actuated navigation, a new kind of pedestrian navigation in which the user does not need to attend to the navigation task at all. An actuation signal is directly sent to the human motor system to influence walking direction. To achieve this goal we stimulate the sartorius muscle using electrical muscle stimulation. The rotation occurs during the swing phase of the leg and can easily be counteracted. The user therefore stays in control. We discuss the properties of actuated navigation and present a lab study on identifying basic parameters of the technique as well as an outdoor study in a park. The results show that our approach changes a user’s walking direction by about 16°/m on average and that the system can successfully steer users in a park with crowded areas, distractions, obstacles, and uneven ground.

This project received some extended press coverage! See for example: Heise online, Wired, New Scientist

Christian Winkler, Jan Gugenheimer, Alexander De Luca, Gabriel Haas, Philipp Speidel, David Dobbelstein, Enrico Rukzio
Glass Unlock: Enhancing Security of Smartphone Unlocking through Leveraging a Private Near-eye Display

This paper presents Glass Unlock, a novel concept using smart glasses for smartphone unlocking, which is theoretically secure against smudge attacks, shoulder-surfing, and camera attacks. By introducing an additional temporary secret like the layout of digits that is only shown on the private near-eye display, attackers cannot make sense of the observed input on the almost empty phone screen. We report a user study with three alternative input methods and compare them to current state-of-the-art systems.

We would like to thank all our collaborators who worked very hard to make all this possible!


Finally, here are some impressions from the conference:


CHI 2014 in Toronto

The Conference on Human Factors in Computing Systems (CHI) is the premier annual conference in the field of Human-Computer-Interaction. For researchers in our field, it is the most important venue to publish and present their work.

At CHI 2014 in Toronto, our group is represented in almost all categories, and we are especially happy that even more papers than last year got accepted.

Papers and Notes:
Full papers and notes are the most important submission category of CHI. This year, the acceptance rate was 23%. Six of our submissions got accepted and we are very happy to announce that one of them received a „Best Paper Honorable Mention Award“.

2Nora Broy, Stefan Schneegass, Florian Alt, Albrecht Schmidt
FrameBox and MirrorBox: Tools for Prototyping User Interfaces for 3D Displays (Video)


thumbnail Alexander De Luca, Marian Harbach, Emanuel von Zezschwitz, Max Maurer, Bernhard Slawik, Heinrich Hussmann, Matthew Smith
Now You See Me, Now You Don’t – Protecting Smartphone Authentication from Shoulder Surfers (Video)

1Miriam Greis, Florian Alt, Niels Henze, Nemanja Memarovic
I Can Wait a Minute: Uncovering the Optimal Delay Time for Pre-Moderated User-Generated Content on Public Displays (Video)


3Jonna Häkkilä, Maaret Posti, Stefan Schneegass, Florian Alt, Kunter Gultekin, Albrecht Schmidt
Let me catch this! Experiencing interactive 3D Cinema through collecting content with a mobile phone (Video)

thumbnail_file621-6Felix Lauber, Andreas Butz
In-Your-Face, Yet Unseen? Improving Head-Stabilized Warnings to Reduce Reaction Time (Video)


file113-2Julie Wagner, Eric Lecolinet, Ted Selker
Multi-finger Chords for Hand-held Tablets: Recognizable and Memorable (Video) – Best Paper Honorable Mention Award


Work-in-Progress Papers:
The Work-in-Progress track allows authors to present their ongoing work in a more concise format. Seven submissions from the media informatics group were accepted.

There are several workshops in conjunction with CHI every year. This year, our group is engaged in organizing two workshops and we are presenting papers at four different workshops.


Workshop Papers:

TOCHI is a journal which also offers the presentation of the work at CHI. We also got one paper accepted there.

We are happy that we were able to help shaping the program bei reviewing for all available tracks and being part of the the program committee. During CHI we will be present as session chairs and support CHI with three student volunteers.

We want to thank all our collaboration partners who worked very hard to make all this possible. See you in Toronto!

TEI 2014: Conference on Tangible, Embedded and Embodied Interaction

Im Februar waren wir die Gastgeber der TEI 2014 – oder länger – der Conference on Tangible, Embedded and Embodied Interaction.

Über 300 Besucher aus Forschung und Industrie aus aller Welt nahmen an der viertägigen Konferenz Teil, die mit einem Hands-On Tag – dem sogenannten Studio Tag – startete. In 10 verschiedenen Studios wurde gebastelt, gelötet, genäht und vor allem Interaktives erstellt.

Die drei folgenden Tage waren geprägt von Fachvorträgen sowie Live Demos verschiedenster Installationen. Es wurde auf der Bühne „gesungen“, geskatet, gezaubert und vieles mehr. Die TEI bringt dabei unter anderem Forscher, Künstler, Informatiker und Designer zusammen.

Abgerundet wurde das Programm durch das Konferenzdinner im Augustiner Keller, einem Weißwurstfrühstück und einer Stadtführung. Somit haben unsere Gäste neben fachlicher Inspiration auch die bayrische Kultur und München kennengelernt.

Der Lehrstuhl für Mensch-Maschine-Interaktion und der Lehrstuhl für Medieninformatik und deren Mitarbeiter waren dabei für große Teile der Organisation verantwortlich. Die gesamte lokale Organisation aber auch inhaltliche Aspekte wie die Auswahl der Paper wurde teilweise von uns übernommen.

Das komplette Programm, wie mehr fotografische Impressionen sind online verfügbar. Mit dem nötigen Zugang können auch alle Publikationen in der ACM Library runtergeladen werden.

Interact 2013

Bereits im September flog ein größerer Teil des Lehrstuhls nach Kapstadt um die Interact 2013 zu besuchen. Wir selbst waren breit vertreten und organisierten zusammen mit Kollegen aus Eindhoven einen Workshop zum Thema Peripheral Interaction: Embedding HCI in Everyday Life.

Im Papertrack waren wir teilweise in mehreren Sessions parallel vertreten und stellten insgesamt 10 Paper vor.


Nicht unerwähnt sollte auch unser Gruppenposter bleiben. Unser Barkeeper hat den Sprung aus unserer Kaffeeküche in die wissenschafltiche Welt geschaft:


Und weil es sich nun wirklich nicht lohnt soweit zu fliegen und dann direkt nach der Konferenz wieder heimzufahren hängten wir ein paar Tage Urlaub an und erkundeten noch drei Tage Kapstadt und das Umland. Hier zusammen mit zwei HCI Kollegen aus Österreich am Kap.


CHI 2013 in Paris

The Conference on Human Factors in Computing Systems (CHI) is the premier annual conference in the field of Human-Computer-Interaction. For researchers in our field, it is the most important venue to publish and present their work.

At CHI 2013 in Paris, our group is represented in almost all categories.

Papers and Notes:
Full papers and notes are the most important submission category of CHI. This year, the acceptance rate was 19%. Three of our submissions got accepted and we are more than happy to announce that all of them received a „Best Paper Honorable Mention Award“. The official announcement states that „of the nearly 2000 papers submitted to CHI this year, this paper was selected as one of the very best — one of a little less than 5% of submissions to receive this designation.“

Back-of-Device Shapes

De Luca, von Zezschwitz, Nguyen, Maurer, Rubegni, Scipioni, Langheinrich. Back-of-Device Authentication on Smartphones. (Paper, Best Paper Honorable Mention Award)

Fake Cursors

De Luca, von Zezschwitz, Pichler, Hussmann. Using Fake Cursors to Secure On-Screen Password Entry. (Note, Best Paper Honorable Mention Award)


Beyer, Köttner, Schiewe, Haulsen, Butz. Squaring the Circle: How Framing Influences User Behavior around a Seamless Cylindrical Display. (Paper, Best Paper Honorable Mention Award)

Work-in-Progress Papers:
The Work-in-Progress track allows authors to present their ongoing work in a more concise format. Three submissions from the media informatics group were accepted. We want to specifically highlight the WiP paper by Denys Matthies, a media informatics student.

  • Knobel, Hassenzahl, Lamara, Schumann, Butz. A Trip into the Countryside: An Experience Design for Explorative Car Cruises.
  • Matthies. InEar BioFeedController: A Headset For Hands-Free And Eyes-Free Interaction With Mobile Devices.
  • Hausen, Wagner, Boring, Butz. Comparing Modalities and Feedback for Peripheral Interaction.

There are several workshops in conjunction with CHI every year. This year, our group is engaged in organizing two workshops and we are presenting papers at four different workshops.


Workshop Papers:

Special Interest Groups:
SIGs provide a forum to have focused discussions on a specific topic for a whole 80-minutes session. This year, Alexander De Luca is co-organizing a SIG on “Designing Interactive Secure Systems”.

We want to thank all our collaboration partners who worked very hard to make all this possible. See you in Paris and hopefully also in Toronto 2014!

Conference on Tangible, Embedded and Embodied Interaction

Letzte Woche verbrachten eine Hand voll Mitarbeiter, Professoren und Studenten ein paar Tage in Barcelona und besuchten die Conference on Tangible, Embedded and Embodied Interaction oder auch kurz TEI.

_DSF6567 _DSF6473

Die Konferenz ist – wie es so schön während der Veranstaltung hieß – für manche Besucher die wissenschaftlichste Konferenz, für andere die am wenigsten wissenschaftliche Konferenz auf der sie je waren. Designer, Künstler und Informatiker treffen hier aufeinander. Kunst Installationen, Vorträge und Interaktive Prototpyen sorgen für ein abwechslungsreiches Programm.

Auch wir waren gut vertreten mit drei Publikationen (Empowering Materiality: Inspiring the Design of Tangible Interactions & cubble: A Multi-Device Hybrid Approach Supporting Communication in Long-Distance Relationships & LiquiTouch: Liquid as a Medium for Versatile Tactile Feedback on Touch Surfaces) die sowohl in Vorträgen präsentiert wie auch in der Demo Session live gezeigt und ausprobiert wurden.


Die Closing Keynote wurde von Bill Verplank live aufgemalt. Ein Bild das eigentlich jedem Medieninformatik Studenten bekannt sein sollte.


Nun liegt es an uns. Wir sind der Gastgeber für die nächste TEI im Februar 2014. Und Oh-My-God! Die Spanier haben ordentlich vorgelegt, aber wir werden unser Bestes geben um mindestens genauso inspirierende und tolle Tage in München zu bieten.


Updates zur TEI 2014 gibt es bei Facebook und bei Twitter und natürlich bald auch auf der dazugehörigen Webseite.
Für alle wissenschaftlich interessierten Studierenden wird es verschiedenste Möglichkeiten geben an dem Event teilzunehmen und dazu beizutragen. Näheres dazu voraussichtlich im September auf der TEI Webseite.

Symposium on Cyberspace Safety and Security

IMG_20121212_174809Cyberspace. Ein Wort das sich erst mal irgendwie nach 90ern anhört. Nach komischen Filmen und ganz und gar nicht nach Web 2.0. Aber das Thema ist aktueller den je. Die Cloud ist in aller Munde aber was macht sie sicher? Wer kann alles auf meine Daten in der Cloud zugreifen? Wer garantiert mir, dass nichts verloren geht? Wie kann ich in der Cloud anonym bleiben wenn ich es möchte? Diese und andere Fragen werden mit wissenschaftlichen Papern und Diskussionen bei der CSS 2012 geklärt.

Ein Paper von der Media Informatics Group ist auch dabei und ich durfte dafür einmal halb um dem Planeten. Denn zwischen Känguruhs und Koalas liegt hier in einem Vorot von Melbourne die Deakin University, die dieses Symposium organisiert. Das Paper behandelt die Thematik wie man Phishing Attacken mit Hilfe der Rechtschreibkorrektur der Google Suche auf die Schliche kommen kann. Andere Teilnehmer hier beschäftigen sich zum Beispiel mit der Klassifizierung von SPAM E-Mails als Phishing Mails mit Hilfe von Machine Learning Algorithmen.

2012-12-11 20.55.16Während man hier bei ca. 30 Grad in der brennenden Sonne sitzt läuft in den Cafes „White Christmas“ und „Jingle Bells“ und man fragt sich ob die Menschen den englischsprachigen Text nicht verstehen oder einfach nur ignorieren.

2012-12-11 18.13.07In Zukunft wird sich wohl noch so einiges ändern an der „Cloud“ wie wir sie bisher kennen. Das Speichern von Daten in der Cloud wird möglich werden, so dass nur du und deine Freunde aber nicht mehr der Betreiber des Dienstes die Daten lesen kann. Genauso arbeiten hier viele daran die perfekte Privatsphäre in der Internetkommunikation herzustellen. So dass eine Rückverfolgung im Internet unmöglich wird. Ein großes Problem das mit IPv6 auf uns zukommt. Mit Lebenslangen IP-Adressen brauchen Google, Facebook und Co keine Cookies mehr um zu wissen, wer wer ist im Netz. Bis es soweit ist heißt es noch selbst tätig werden und vor der Nutzung mancher Dienste erst mal das Gehirn einschalten. Freundliche Aussie-Grüsse sendet euch Max.