ABSTRACT
This chapter shows the operations using a projector that is paired with the tag-radio frequency-reader. The projector performs the dual operation of sending optical data to the tag and also giving visual feedback by projecting instructions on objects. The system of projector and photosensing tag offers a set of rich geometric operations. It presents a new medium for many of the results from the area of computer vision, with projector and tags replacing camera and image interest points. The chapter presents the new ideas in the context of a few promising examples. It outlines broad modes of deployment for geometric analysis. Several problems can influence optical communication between the projector and a tag. It can be affected by ambient light. Wavelength division multiplexed communication is commonly used to solve the problem. The optical communication also gets noisier as projector-tag distance increases, and as the photosensor gets dirty.
