The NetworkInput class will interface with a remote instance of the
Stereocam system (specifically, one using the NetworkOutput class,
described in Section 4.2.3), and its GetImage()
method will return the images sent from the remote Stereocam instance, returning
NULL when the supply is exhausted (or the network connection is broken
or severed).
The GetDimension() method will return the size of the images, as communicated by the remote NetworkOutput class instance.