Cross-Device Interaction


In recent years, the number of mobile devices has increased significantly. Along with this explosive growth, advancements in computing technology and the miniaturization makes them small, mobile, personal (super-) computers that we can carry with us. Despite their power, mobility, and density, these devices often idle away in our pockets wasting valuable computing resources.

We envision a future where mobile devices can contribute their (interaction) resources to a community of devices in their proximity. At any time, users can dynamically compose a seamless multi-device user interface (UI) and reconfigure this UI according to their current needs and the task at hand. In this vision, users also can seamlessly add or remove devices from the community without explicit setup or pairing. Instead, this happens implicitly as a byproduct of natural use in space, for example, by bringing multiple devices to the same room, placing them side-by-side on a table or desk, and moving them around as needed. Ideally, users will experience these co-located cooperating devices and reconfigurable displays as one seamless and natural user interface for ad-hoc co-located collaboration.


Roman Rädle
Assistant Professor



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  1. Rädle, R., Jetter, H-C., Fischer, J., Gabriel, I., Klokmose, C. N., Reiterer, H., & Holz, C. (Accepteret/In press). PolarTrack: Optical Outside-In Device Tracking that Exploits Display Polarization. I Proceedings of the 36th annual ACM conference on Human Factors in Computing Systems (CHI '18) ACM Press.
  2. Plank, T., Jetter, H-C., Rädle, R., Klokmose, C. N., Luger, T., & Reiterer, H. (2017). Is Two Enough?! Studying Benefits, Barriers, and Biases of Multi-Tablet Use for Collaborative Visualization. I CHI '17 : Proceedings of the 2017 CHI Conference on Human Factors in Computing Systems (s. 4548-4560). Association for Computing Machinery.



HuddleLamp HuddleLamp is a desk lamp with an integrated low-cost RGB-D camera that detects and identifies mobile displays (e.g., smartphones or tablets) on tables and tracks their positions and orientations with sub-centimeter precision.
Connichiwa Connichiwa is a framework for creating cross device applications without the need for external sensing hardware or server infrastructure. It abstracts away complex multi-device setup and pairing, works across different hardware platforms and architectures, and integrates full-stack web-technologies for cross device applications and communication.