\begin{abstract}
\label{sec:abstract}

This report documents the design and construction of a Full Immersion
Pong system.  Interfacing with the user entirely through video input
and output streams from a camera and to a monitor, and a couple of
LEDs, this device allows two players to ``be'' the paddles in the
traditional computer game Pong.  The device consists of a video I/O
subsystem, a time-domain frame differencer, a game rules module, and a
bitmap overlay module.  The input/output subsystem feeds a stream of
video data and synchronizing timing pulses on to the frame
differencer, which detects motion in the field of view.  This
information is passed on to the rules module, which uses it to
determine whether and when the ``ball'' will bounce.  Finally, the
current ball position is fed to the bitmap overlay module, which
modifies the output stream to include an image of a rotating cube at
that location.

\end{abstract}
