Certainly, it is possible to extend the perceptual measurements above
and a variety of techniques have been developed within the framework
of this thesis. However, we will defer discussion of these input and
output modalities until later. Without loss of generality, we focus on
this constrained case of head and hand blob tracking for the rest of
the system's description. Subsequently, future work with higher order
visual perception will be described and will fit almost directly into
the framework derived for the head and hand modeling case.