ABSTRACT
Building an effective AR system is a difficult task and is an active area of research. This chapter describes, at a high level, the approaches that have been taken so far and the major challenges that system designers face. Section 2 surveys the characteristics of AR systems and the various possible configurations, along with the relative advantages and disadvantages of each. Currently, two of the biggest problems are in registration and sensing: the subjects of Sections 3 and 4. Finally, Section 5 suggests some topics for further work and research.
