FreeTagpaper: a pen-and-paper-based collaboration system using visual tags printed on paper

We propose a novel collaboration system using pen and paper. FreeTagpaper uses a camera set above a work table to recognize the visual tags printed on the paper to acquire the paper's ID and posture. From the paper ID, FreeTagpaper can retrieve the paper's size and format from a document management database. It then uses the format information to transmit images of handwritten notes to the other side and simultaneously projects the other side's handwritten notes onto this paper. Based on this mutual image sharing scheme, users can collaborate in real time using paper of any size, format, and posture. This report describes preliminary work on FreeTagpaper including the current implementation and essential experimental results.