Ash at CIID

Ashwin Rajan's blog while at the Copenhagen Institute of Interaction Design.

Toy View Workshop – Computer Vision Project 2

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In my last post I described the intent of the Toy View workshop held at CIID in December ’08, taught by Yaniv Stiener . Here are some of the projects we developed in the course of the workshop.

Reactable Game
Here is a video on the fascinating open-source Reactable technology – a collaborative music instrument with a multi-touch tangible surface-based interface – developed in Barcelona, Spain.

reacTIVision is an open source, cross-platform computer vision framework for the fast and robust tracking of fiducial markers attached onto physical objects, as well as for multi-touch finger tracking. The reacTIVision Engine and sample code, as well as Feducials (the markers used for tracking that can be attached to physical objects) can all be downloaded for free here.


How the reacTIVision technology works (courtesy


Annotated markers called 'Fiducials' can be pasted onto physical objects to faciliate tracking of object location and movements. (Courtesy

We built our own reacTIVision set up to develop a simple game during the course of this short workshop.

The reactable set-up

Experimenting with the reactable set-up.

We developed  a simple game using images of CIID students and faculty including Yaniv. The game mixed the heads, torsos and legs of different people depending on the how the feducials were placed and turned. A lot of fun and laughs all around!

Reactable game of mixed body parts.

Screenshot of reactable game that mixes body parts from different pictures.


Written by Ashwin Rajan

February 1, 2009 at 10:11 pm

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