Institute of Media Informatics

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(July 2021)

Dr. Dennis Wolf

Dennis Wolf
Dr. Dennis Wolf
Former Research Associate and PhD Candidate
                    

Dr. Dennis Wolf

From 2010 to 2016, Dennis Wolf was a student at Ulm University.  He acquired a B.Sc. (2013) and an M.Sc. in media informatics (2016) at Ulm University, repectively. The title of his master theses was: "OctiCam: An Immersive and Mobile Video Communication System for Relatives and Children". In 2016, he became a Ph.D . student in the Human-Computer-Interaction group.

In the winter of 2016, Dennis spend 3 months  at Cambridge university, UK doing an internship in the  Intelligent Interactive Systems Group lead by Dr Per Ola Kristensson. This lead to a collaboration on the publication "Performance Envelopes of In-Air Direct and Smartwatch Indirect Control for Head-Mounted Augmented Reality" that was presented at the conference IEEE VR 2018.

In July 2021, Dennis Wolf acquired a phd degree at Ulm University for his cumulative work with the title Overcoming Challenges of Controller-Based and Free-Handed Interaction in Cross-Reality.

Research interests

  • Mixed Reality
  • Multi-Modal Feedback
  • Hands-Free Interaction

Projects

JumpVR

One of the great benefits of virtual reality (VR) is the implementation of features that go beyond realism. Common ``unrealistic'' locomotion techniques (like teleportation) can avoid spatial limitation of tracking, but minimize potential benefits of more realistic techniques (e.g. walking). As an alternative that combines realistic physical movement with hyper-realistic virtual outcome, we present JumpVR, a jump-based locomotion augmentation technique that virtually scales users' physical jumps...

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Heisenberg

Virtual and augmented reality head-mounted displays (HMDs) are currently heavily relying on spatially tracked input devices (STID) for interaction. These STIDs are all prone to the phenomenon that a discrete input (e.g. button press) will disturb the position of the tracker, resulting in a different selection point during ray-cast interaction (Heisenberg Effect of Spatial Interaction). Besides the knowledge of its existence, there is currently a lack of a deeper understanding of its severity, structure and impact on throughput and angular error during a selection task. In this work...

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cARe

Cognitive impairment such as memory loss, an impaired executive function and decreasing motivation can gradually undermine instrumental activities of daily living (IADL). With an older growing population, previous works have explored assistive technologies (ATs) to automate repetitive components of therapy and thereby increase patients’ autonomy and reduce dependence on carers. While most ATs were built around screens and projection-based augmented reality (AR), the potential of head-mounted displays (HMDs) for therapeutic assistance is still under-explored. As a contribution to this effort we present cARe, an HMD-based AR framework that uses in-situ instructions and a guidance mechanism to assist patients with manual tasks.

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Face/On

While the real world provides humans with a huge variety of sensory stimuli, virtual worlds most of all communicate their properties by visual and auditory feedback due to the design of current head mounted displays (HMDs). Since HMDs offer sufficient contact area to integrate additional actuators, prior works utilised a limited amount of haptic actuators to integrate respective information about the virtual world. 

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Performance Envelopes

The scarcity of established input methods for augmented reality (AR) head-mounted displays (HMD) motivates us to investigate the performance envelopes of two easily realisable solutions: indirect cursor control via a smartwatch and direct control by in-air touch.

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SwiVRChair

Since 360 degree movies are a fairly new medium, creators are facing several challenges such as controlling the attention of a user. In traditional movies this is done by applying cuts and tracking shots which is not possible or advisable in VR since rotating the virtual scene in front of the user’s eyes will lead to simulator sickness. One of the reasons this effect occurs is when the physical movement (measured by the vestibular system) and the visual movement are not coherent.

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GyroVR

GyroVR uses head worn flywheels designed to render inertia in Virtual Reality (VR). Motions such as flying, diving or floating in outer space generate kinesthetic forces onto our body which impede movement and are currently not represented in VR. GyroVR simulates those kinesthetic forces by attaching flywheels to the users head which leverage the gyroscopic effect of resistance when changing the spinning axis of rotation. 

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OctiCam is a mobile and child-friendly device that consists of a stuff ed toy octopus on the outside and a communication proxy on the inside. Relying only on two squeeze buttons in the tentacles, we simpli ed the interaction with OctiCam to a child-friendly level. A build-in microphone and speaker allows audio chats while a build-in camera streams a 360 degree video using a fi sh-eye lens. 

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This project deals with a novel multi-screen interactive TV setup (smarTVision) and its enhancement through Companion-Technology. Due to their flexibility and the variety of interaction options, such multi-screen scenarios are hardly intuitive for the user. While research known so far focuses on technology and features, the user itself is often not considered adequately. Companion-Technology has the potential of making such interfaces really user-friendly. Building upon smarTVision, it’s extension via concepts of Companion-Technology is envisioned. This combination represents a versatile test bed that not only can be used for evaluating usefulness of Companion-Technology in a TV scenario, but can also serve to evaluate Companion-Systems in general.

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ColorSnakes

ColorSnakes is an authentication mechanism based solely on software modification which provides protection against shoulder surfing and to some degree to video attacks. A ColorSnakes PIN consists of a starting colored digit and is followed by four consecutive digits. From the starting colored digit, users indirectly draw a path (selection path) consisting of their PIN. The input path can be drawn anywhere on the grid.

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Teaching

  • Intergration of vibro-tactile, thermal, and EMS actuators into a virtual reality head-mounted display for increased immersion (MA, Leo Hnatek, 2017)
  • Exploring Hand-Tracking and Smartwatch-Based Pointing in Virtual Reality (MA, Suhasaleem Holalkere, 2018)
  • An Augmented Reality Framework for Assisted Activities in Dementia Therapy (MA, Daniel Besserer, 2018)
  • C-AR: Improving Situational Awareness for Automated Driving Level 3 through Multi-User Augmented Reality Interaction (MA, David Klein, 2018)
  • Adaptive AR Interfaces Via EEG (BA, Tobias Wagner, 2019)
  • An In-Depth Evaluation of and Compensation for the Heisenberg Effect (BA, Marco Combosch, 2019)
  • An Evaluation of Path Visualization and Positional Tracking for the Purpose of Indoor Navigation Using the HoloLens and Bluetooth Low Energy Beacons (BA, Linus Hunziger)
  • VRJumping: Exploring Jump-Based Locomotion in Virtual Reality (MA, Christopher Kunder, 2019)
  • Don't Sweat It!: Exploring Asymmetrical Biometric Feedback in Collaborative Gaming (MA, Shyukryan Karaosmanoglu, 2019)
  • The Impact of Discrete Rotations on Locomotion in VR (BA, Laura Bottner, 2019)
  • FootVR: Exploring Foot-Controlled Locomotion in Virtual Reality (BA, Anja Schikorr, 2019)
  • Fall Prevention in VR (BA, Sarah Schaupp, 2019)
  • The Impact of Exposure Time on User Presence in Virtual Reality (BA, Roya Eslabagh, 2019)

Scientific Activities

  • Conference Reviewer: CHI '17, '18, '19, '20, CHI Play '20, MobileHCI '18, PerDis '17, GI '19, DIS '20
  • Conference Presenter: IEEE VR '18, UIST '18, ISMAR '19, MUM '19, CHI '20

 

Publications

2021

20.
D. Wolf, M. Rietzler, L. Bottner and E. Rukzio, "Augmenting Teleportation in Virtual Reality With Discrete Rotation Angles", Jun. 2021. Arxiv.org.
File:http://arxiv.org/abs/2106.04257
19.
S. Karaosmanoglu, K. Rogers, D. Wolf, E. Rukzio and L. E. Nacke, "Feels Like Team Spirit: Biometric and Strategic Interdependence in Asymmetric Multiplayer VR Games", In Proc. of CHI 2021 (SIGCHI Conference on Human Factors in Computing Systems), May 2021. ACM.
DOI:10.1145/3411764.3445492
Weblink:https://youtu.be/YMkVznNuxxE
File:/fileadmin/website_uni_ulm/iui.inst.100/1-hci/hci-paper/2021/2021_CHI_Feels_like_Team_Spirit_Karaosmanoglu_author_version_compressed.pdf
18.
M. Colley, D. Wolf, S. Böhm, T. Lahmann, L. Porta and E. Rukzio, "Resync: Towards Transferring Somnolent Passengers to Consciousness", 23rd International Conference on Mobile Human-Computer Interaction Adjunct Proceedings, 2021.
DOI:10.1145/3447527.3474847
Weblink:https://youtu.be/1yH9XFIHz34
File:/fileadmin/website_uni_ulm/iui.inst.100/1-hci/hci-paper/2021/MobileHCI_WIP_2021_Sleep_final.pdf

2020

17.
D. Wolf, K. Rogers, C. Kunder and E. Rukzio, "JumpVR: Jump-Based Locomotion Augmentation for Virtual Reality", In Proc. of CHI 2020 (SIGCHI Conference on Human Factors in Computing Systems), vol. ACM, Apr. 2020.
DOI:10.1145/3313831.3376243
Weblink:https://youtu.be/cWBxh3I5lHg
File:/fileadmin/website_uni_ulm/iui.inst.100/institut/mitarbeiterbereiche/wolf/JumpVR_CHI20.pdf
16.
D. Wolf, J. Gugenheimer, M. Combosch and E. Rukzio, "Understanding the Heisenberg Effect of Spatial Interaction: A Selection Induced Error for Spatially Tracked Input Devices", In Proc. of CHI 2020 (SIGCHI Conference on Human Factors in Computing Systems), Apr. 2020. ACM.
DOI:10.1145/3313831.3376876
Weblink:https://youtu.be/HwDPTof3BUo
File:/fileadmin/website_uni_ulm/iui.inst.100/institut/mitarbeiterbereiche/wolf/HeisenbergCHI20.pdf
15.
A. Colley, D. Wolf, K. Kammerer, E. Rukzio and J. Häkkila, "Exploring the Performance of Graphically Designed AR Markers" in 19th International Conference on Mobile and Ubiquitous Multimedia, ACM, Nov. 2020, pp. 317–319.
DOI:10.1145/3428361.3432076
File:/fileadmin/website_uni_ulm/iui.inst.100/1-hci/hci-paper/2020/2020-mum-Graphically_Designed_AR_Markers_POSTER.pdf

2019

14.
D. Wolf, D. Besserer, K. Sejunaite, A. Schuler, M. Riepe and E. Rukzio, "A Demonstration of cARe: An Augmented Reality Support System for Geriatric Inpatients with Mild Cognitive Impairment", In Adj. Proc. of MUM19 (18th International Conference on Mobile and Ubiquitous Multimedia), Nov. 2019. ACM.
DOI:10.1145/3365610.3368472
Weblink:https://www.uni-ulm.de/index.php?id=100473
File:pdfhttps://www.uni-ulm.de/fileadmin/website_uni_ulm/iui.inst.100/institut/Papers/Prof_Rukzio/2019/a58-wolf.pdf
13.
D. Wolf, D. Besserer, K. Sejunaite, A. Schuler, M. Riepe and E. Rukzio, "cARe: An Augmented Reality Support System for Geriatric Inpatients with Mild Cognitive Impairment", In Proc. of MUM19 (18th International Conference on Mobile and Ubiquitous Multimedia), Nov. 2019. ACM.
DOI:10.1145/3365610.3365612
Weblink:https://www.uni-ulm.de/index.php?id=100473
File:pdfhttps://www.uni-ulm.de/fileadmin/website_uni_ulm/iui.inst.100/institut/Papers/Prof_Rukzio/2019/a2-wolf.pdf
12.
D. Wolf, T. Wagner and E. Rukzio, "Low-Cost Real-Time Mental Load Adaptation for Augmented Reality Instructions - A Feasibility Study", In Adj. Proc. of ISMAR 2019 (2019 IEEE International Symposium on Mixed and Augmented Reality), Oct. 2019. IEEE.
DOI:10.1109/ISMAR-Adjunct.2019.00015
File:/fileadmin/website_uni_ulm/iui.inst.100/institut/mitarbeiterbereiche/wolf/LowCostEEGPoster.pdf
11.
D. Wolf, M. Rietzler, L. Hnatek and E. Rukzio, "Face/On: Multi-Modal Haptic Feedback for Head-Mounted Displays in Virtual Reality", IEEE Transactions on Visualization and Computer Graphics (TVCG), Aug. 2019.
DOI:10.1109/TVCG.2019.2932215
Weblink:https://www.uni-ulm.de/index.php?id=98825
File:/fileadmin/website_uni_ulm/iui.inst.100/1-hci/hci-paper/2019/2019_Wolf_TVCG_FaceOn.pdf

2018

10.
D. Wolf, D. Besserer, K. Sejunaite, M. Riepe and E. Rukzio, "cARe: An Augmented Reality Support System for Dementia Patients", In Adj. Proc. of UIST '18 (ACM Symposium on User Interface Software and Technology), Oct. 2018.
DOI:10.1145/3266037.3266095
File:pdfhttps://www.uni-ulm.de/fileadmin/website_uni_ulm/iui.inst.100/institut/mitarbeiterbereiche/wolf/cARePosterAbstract.pdf
9.
D. Wolf, L. Hnatek and E. Rukzio, "Face/On: Actuating the Facial Contact Area of a Head-Mounted Display for Increased Immersion", In Adj. Proc. of UIST '18 (ACM Symposium on User Interface Software and Technology), Oct. 2018.
DOI:10.1145/3266037.3271631
File:pdfhttps://www.uni-ulm.de/fileadmin/website_uni_ulm/iui.inst.100/institut/mitarbeiterbereiche/wolf/FaceOnNew.pdf
8.
D. Wolf, J. J. Dudley and P. O. Kristensson, "Performance Envelopes of In-Air Direct and Smartwatch Indirect Control for Head-Mounted Augmented Reality", Proceedings of IEEE VR 2018 (25th IEEE Conference on Virtual Reality and 3D User Interfaces), Mar. 2018. https://youtu.be/W1ytGdOZHpU.
DOI:10.1109/VR.2018.8448289
Weblink:https://www.uni-ulm.de/index.php?id=92485
File:pdfhttps://www.uni-ulm.de/fileadmin/website_uni_ulm/iui.inst.100/institut/mitarbeiterbereiche/wolf/IEEE_VR_2018_Watch_vs_Hand_in_AR.pdf

2017

7.
J. Gugenheimer, C. Winkler, D. Wolf and E. Rukzio, "Interaction with Adaptive and Ubiquitous User Interfaces" in Companion Technology - A Paradigm Shift in Human-Technology Interaction, Biundo, Susanne, and Andreas Wendemuth, Eds. Springer, 2017, pp. 209-229.
DOI:10.1007/978-3-319-43665-4_11
ISBN:978-3-319-43665-4
Weblink:https://www.uni-ulm.de/index.php?id=92261
File:pdfhttps://www.uni-ulm.de/fileadmin/website_uni_ulm/iui.inst.100/institut/mitarbeiterbereiche/wolf/CompanionBookB5Chapter.pdf

2016

6.
J. Gugenheimer, D. Wolf, E. Eiriksson, P. Maes and E. Rukzio, "GyroVR: Simulating Inertia in Virtual Reality using Head Worn Flywheels", In Proceedings UIST 2016 (ACM Symposium on User Interface Software and Technology), Oct. 2016. https://youtu.be/RPWsaIYYI6g.
DOI:10.1145/2984511.2984535
Weblink:https://www.uni-ulm.de/index.php?id=85211
File:pdfhttps://www.uni-ulm.de/fileadmin/website_uni_ulm/iui.inst.100/institut/mitarbeiterbereiche/wolf/GyroVRPaper.pdf
5.
J. Gugenheimer, D. Wolf, G. Haas, S. Krebs and E. Rukzio, "A Demonstration of SwiVRChair: A Motorized Swivel Chair to Nudge Users’ Orientation for 360 Degree Storytelling in Virtual Reality", In Adj. Proc. (Demo) of Ubicomp 2016 (ACM International Joint Conference on Pervasive and Ubiquitous Computing),, Sep. 2016. https://www.uni-ulm.de/index.php?id=85224.
DOI:10.1145/2968219.2971363
File:pdfhttps://www.uni-ulm.de/fileadmin/website_uni_ulm/iui.inst.100/institut/Papers/Prof_Rukzio/2016/SwiVRDemoUbiComp.pdf
4.
J. Gugenheimer, D. Wolf, G. Haas, S. Krebs and E. Rukzio, "SwiVRChair: A Motorized Swivel Chair to Nudge Users' Orientation for 360 Degree Storytelling in Virtual Reality", In Proc. of CHI 2016 (SIGCHI Conference on Human Factors in Computing Systems), May 2016. https://youtu.be/qRSqbCHiMS4.
DOI:10.1145/2858036.2858040
Weblink:https://www.uni-ulm.de/index.php?id=85224
File:pdfhttp://www.uni-ulm.de/fileadmin/website_uni_ulm/iui.inst.100/institut/mitarbeiterbereiche/wolf/SwiVRChair.pdf
3.
[English] J. Gugenheimer, F. Honold, D. Wolf, F. Schüssel, J. Seifert, M. Weber and E. Rukzio, "How Companion-Technology can Enhance a Multi-Screen Television Experience: A Test Bed for Adaptive Multimodal Interaction in Domestic Environments", KI - Künstliche Intelligenz, Feb. 2016. Springer, https://youtu.be/srODhHgU3LA.
DOI:10.1007/s13218-015-0395-7
Weblink:https://www.uni-ulm.de/index.php?id=85227
File:pdfhttps://www.uni-ulm.de/fileadmin/website_uni_ulm/iui.inst.100/institut/mitarbeiterbereiche/rukzio/publications/GugenheimerCompanion2015.pdf

2015

2.
J. Gugenheimer, A. De Luca, H. Hess, S. Karg, D. Wolf and E. Rukzio, "ColorSnakes: Using Colored Decoys to Secure Authentication in Sensitive Contexts", In Proc. of MobileHCI 2015 (17th International Conference on Human-Computer Interaction with Mobile Devices and Services), 2015. https://youtu.be/hz1MYrhhj1Y.
DOI:10.1145/2785830.2785834
Weblink:https://www.uni-ulm.de/index.php?id=85228
File:pdfhttps://www.uni-ulm.de/fileadmin/website_uni_ulm/iui.inst.100/institut/mitarbeiterbereiche/wolf/ColorSnakes.pdf
1.
[English] D. Wolf, J. Gugenheimer and E. Rukzio, "OctiCam: An immersive and mobile video communication device for parents and children", Proc. of ISCT 2015 (1st International Symposium on Companion-Technology), 2015. http://vts.uni-ulm.de/doc.asp?id=9771.
DOI:10.18725/OPARU-3252
Weblink:https://www.uni-ulm.de/index.php?id=85226
File:pdfhttps://www.uni-ulm.de/fileadmin/website_uni_ulm/iui.inst.100/institut/mitarbeiterbereiche/wolf/OctiCamISCT15.pdf
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