Foreground Occlusions

  

Figure 2.1: Foreground Occlusion

The foreground occlusion blocks the view of the boundary of the display. In general, foreground occlusions can be binocular.

A ``foreground occlusion'' can be thought of as a ``peephole'' through which to view a display, possibly a peephole for each eye (see Figure 2.1). More formally, a ``foreground occlusion'' is defined here to be ``an obstruction mounted in front of a display in such a way that only the display (and not its boundary) is visible through the obstruction, and such that the display is at a greater visual distance than all other available visual cues.''

Because a foreground occlusion places the display at a greater distance than other visual cues, it encourages the observer to interpret the display as the visual background. The importance of this is discussed below.

Human Interface Technology Lab

Human Interface Technology Lab