Single display groupware: a model for co-present collaboration
Proceedings of the SIGCHI conference on Human Factors in Computing Systems
DiamondTouch: a multi-user touch technology
Proceedings of the 14th annual ACM symposium on User interface software and technology
Territoriality in collaborative tabletop workspaces
CSCW '04 Proceedings of the 2004 ACM conference on Computer supported cooperative work
Mediating Group Dynamics through Tabletop Interface Design
IEEE Computer Graphics and Applications
Proceedings of the SIGCHI Conference on Human Factors in Computing Systems
AVI '08 Proceedings of the working conference on Advanced visual interfaces
Proceedings of the 8th International Conference on Interaction Design and Children
CSCL'09 Proceedings of the 9th international conference on Computer supported collaborative learning - Volume 1
Single user multitouch on the DiamondTouch: from 2 x 1D to 2D
Proceedings of the ACM International Conference on Interactive Tabletops and Surfaces
Actions speak loudly with words: unpacking collaboration around the table
Proceedings of the ACM International Conference on Interactive Tabletops and Surfaces
Multi-touch authentication on tabletops
Proceedings of the SIGCHI Conference on Human Factors in Computing Systems
HandsDown: hand-contour-based user identification for interactive surfaces
Proceedings of the 6th Nordic Conference on Human-Computer Interaction: Extending Boundaries
VisTACO: visualizing tabletop collaboration
ACM International Conference on Interactive Tabletops and Surfaces
What caused that touch?: expressive interaction with a surface through fiduciary-tagged gloves
ACM International Conference on Interactive Tabletops and Surfaces
Digital mysteries: designing for learning at the tabletop
ACM International Conference on Interactive Tabletops and Surfaces
IdWristbands: IR-based user identification on multi-touch surfaces
ACM International Conference on Interactive Tabletops and Surfaces
Medusa: a proximity-aware multi-touch tabletop
Proceedings of the 24th annual ACM symposium on User interface software and technology
Proceedings of the ACM International Conference on Interactive Tabletops and Surfaces
iDwidgets: parameterizing widgets by user identity
INTERACT'05 Proceedings of the 2005 IFIP TC13 international conference on Human-Computer Interaction
dSensingNI: a framework for advanced tangible interaction using a depth camera
Proceedings of the Sixth International Conference on Tangible, Embedded and Embodied Interaction
See me, see you: a lightweight method for discriminating user touches on tabletop displays
Proceedings of the SIGCHI Conference on Human Factors in Computing Systems
Extended multitouch: recovering touch posture and differentiating users using a depth camera
Proceedings of the 25th annual ACM symposium on User interface software and technology
Proceedings of the 25th annual ACM symposium on User interface software and technology
MTi: A method for user identification for multitouch displays
International Journal of Human-Computer Studies
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Key functionality for interactive tabletops to provide effective collaboration affordances requires touch identification, where each touch is matched to the right user. This can be valuable to provide adaptive functions, personalisation of content, collaborative gestures and capture of differentiated interaction for real-time or further analysis. While there is increased attention on touch-identification mechanisms, currently there is no developed solution to readily enhance available tabletop hardware to include such functionality. This paper proposes a plug-in system that adds touch identification to a conventional tabletop. It also presents an analysis tool and the design of an evaluation suite to inform application designers of the effectiveness of the system to differentiate users. We illustrate its use by evaluating the solution under a number of conditions of: scalability (number of users); activity density; and multi-touch gestures. Our contributions are: (1) an off-the-shelf system to add user differentiation and tracking to currently available interactive tabletop hardware; and (2) the foundations for systematic assessment of touch identification accuracy for vision-based systems.