Tele-Graffiti: A Pen and Paper-Based Remote Sketching System

The advantage of our system over other intelligent desktops [2] and white-boards [1] is that the users are free to move the pieces of paper on which they are writing. In TeleGraffiti, paper detection and tracking is based on real-time paper boundary detection. In the applications mentioned above, this step needs to be robust to the occlusions caused by the user’s hands and the distractions caused by printed or hand-written material on the paper. As the paper may move during the time lag between image projection and capture, we also need to disambiguate the paper from the projected image at previous time-step. Finally, the two-fold ambiguity in the paper orientation has to be resolved. See Figure 3. Detected "Top" Edge Clipboard Projected Edges (Removed)