Tele-Graffiti: A camera-projector based remote sketching system with hand-based user interface and automatic session summarization
One way to build a remote sketching system is to use a video camera to image what each user draws at their site, transmit the video to the other sites, and display it there using an LCD projector. Such camera-projector based remote sketching systems date back to Paul Wellner's ( largely unimplemented) Xerox Double DigitalDesk. To make such a system usable, however, the users have to be able to move the paper on which they are drawing, they have to be able to interact with the system using a convenient interface, and sketching sessions must be stored in a compact format so that they can be replayed later. We have recently developed Tele-Graffiti, a remote sketching system with the following three features: ( 1) real-time paper tracking to allow the users to move their paper during system operation, ( 2) a hand based user interface, and ( 3) automatic session summarization and playback. In this paper, we describe the design, implementation, and performance of Tele-Graffiti.
camera-projector based remote sketching systems hand-based user interfaces playback remote communication and collaboration video compression and transmission paper detection and tracking automatic summarization archiving