ABSTRACT
Radio frequency (RF) tags allow objects to become self-describing, communicating their identity to a close–at-hand RF reader. This chapter discusses the operations are shown using a projector that is paired with the tag RF reader. The projector performs the dual operation of sending optical data to the tag and also giving visual feedback by projecting instructions onto objects. In addition to identity, a RF Identification and Geometry (RFIG) tag can record and respond its own geometric context, such as absolute and relative location with respect to adjacent RFIG tags. Tag readers operate in broadcast mode with no concept of a directional communication; however, the RFIG tags allow the locating of tags within a few millimeters, support selection of individual tags, and create a two dimensional or three dimensional coordinate frames for the tags. Conventional tag communication works by broadcast from a RF reader, with response from all in-range tags.
