Novel approaches have taken augmented reality beyond traditional eye-worn or hand-held displays - enabling additional application areas.
New display paradigms exploit large spatially aligned optical elements, such as mirror beam-splitters, transparent screens or holograms, as well as video-projectors. Thus, we call this technological variation “Spatial Augmented Reality (SAR)”.
In many situations, SAR displays are able to overcome technological and ergonomic limitations of conventional AR systems.
Due to the fall in cost and availability of projection technology, personal computers and graphics hardware, there has been a considerable interest in exploiting SAR systems in universities, research laboratories, museums, industry and in the art community.
Parallels to the development of virtual environments from head-attached displays to spatial projection screens can be clearly drawn. We believe that an analog evolution of augmented reality has the potential to yield a similar successful factor in many application domains.
Thereby, SAR and body-attached AR are not competitive, but complementary.