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reactable
The idea of the reactable workgroup is to create a toolkit in Ptolemy II.
that enables construction of applications like the reactable
(see http://www.youtube.com/watch?v=0h-RhyopUmc ) with the objective
of requiring much less infrastructure. I.e., it should work with a
standard video camera on a laptop for example.
The underlying goal of the reactable project is to use video
processing as a driver for research in to models of computation and
cyber-physical
systems.
In particular, when a periodic model of
computation such as Synchronous Dataflow (SDF) interacts with an
asynchrounous data source such as a video stream, then there are a
number of possibilities. Among them are:
- Return the last video frame
- Hang and wait for a new video frame
- Periodically poll for a new video frame
Each of these designs has tradoffs and is illustrative of design
choices that must be made when integrating between a physical process
and computation.
The Reactable uses
OpenCV, which has a
number of Java interfaces. During our review of these interfaces, we
asked, "What is the underlying model of computation of the interface?" and "How
appropriate is the underlying model of the interface in an actor
oriented system?" These questions have prompted us to
use OpenCV as a driver for a discussion about
Dataflow with Marc Geilen
(Eindhoven University of Technology)
about buffer copying and optimization.
Resources
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