Computer Vision: From Motion Capture to Tabletop Interaction
Licentiatavhandling, 2010

This thesis presents the work done by the candidate in the domain of Human-Computer Interaction. In particular, the candidate has investigated how techniques in Computer Vision can be used to enable new forms of interaction. The work investigates areas such as motion capture and multi-user, multi-touch interaction for tabletop systems. In the field of motion capture the candidate has investigated the so-called missing markers problem in optical motion capture systems. A first approach to tackling the missing marker problem is presented and evaluated. This approach is based on extrapolation of trajectory information and the retrofitting of such trajectory onto a perfect line or circle. In a second approach, tackling the weak points of the previous one, a more stable solution using a so-called constraint matrix is proposed. The computer vision techniques used in optical motion capture can be extrapolated, adapted and reused to solve tracking problems in, for instance, optically enabled tracking systems for multi-touch interaction. In the domain of tabletop interaction a novel approach to multi-user identification and multi-point interaction is presented along with two applications. The approach makes use of light emitting devices and of the light spot these cast when shined on a surface. The color, size and shape of the light spot enables for a six degrees of freedom device and for user identification. Finally, an emergency management application taking advantage of some of these features is presented.

optical tracking


motion capture


missing maker


EE room, EDIT building, Chalmers University of Technology
Opponent: Stefan Seipel


Tommaso Piazza

Chalmers, Data- och informationsteknik

Towards Solving the Missing Marker Problem in Realtime Motion Capture

Proc. ASME DETC/CIE 2009, Virtual Environments and Systems (VES).,; (2010)p. 1521-1526

Paper i proceeding

CERMIT: Co-located and Remote Collaborative System for Emergency Response Management

To appear in Proc. SIGRAD 2009,; (2009)p. 12-

Paper i proceeding

Predicting Missing Markers in Real-Time Optical Motion Capture

Lecture Notes in Computer Science,; Vol. 5903(2009)p. 125-136

Artikel i vetenskaplig tidskrift

Ortholumen: Using Light for Direct Tabletop Input

Proc. IEEE International Workshop on Horizontal Interactive Human-Computer Systems (TableTop2007),; (2007)p. 1-4

Paper i proceeding



Datavetenskap (datalogi)

Technical report L - Department of Computer Science and Engineering, Chalmers University of Technology and Göteborg University

EE room, EDIT building, Chalmers University of Technology

Opponent: Stefan Seipel