Naoya Takao, Jianbo Shi, and Simon Baker
tech. report CMU-RI-TR-02-10, Robotics Institute, Carnegie Mellon University, March, 2002

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Many ideas are best communicated by drawing simple sketches. Good examples include the explanation of computer algorithms to undergraduate students and the sketched preliminary designs of architecture. If two people are located remotely from each other a ``remote sketching system'' can help them communicate better. One good way to build a remote sketching system is to use a video camera to image what one user draws at one site and display the video at the second site using an LCD projector. Such camera-projector based remote sketching systems date back to the original proposal of Paul Wellner's Xerox Double DigitalDesk. To make such a system usable, the users have to be able to move the paper on which they are drawing during operation of the system, they have to be able to interact with the system in a straightforward manner, and the feedback through the two-way system has to be controlled. In view of this we recently developed Tele-Graffiti, a remote sketching system which provides solutions for these three problems. The advantages of Tele-Graffiti include: (1) real-time paper tracking to allow the users to move their paper during the operation of the system, (2) a hand based user interface, and (3) feedback control to maximize the quality of the shared images based on photometric analysis of the feedback loop. In this report we describe the design and implementation of Tele-Graffiti.

camera-projector system, remote sketching, paper tracking, communication, user interface, hand tracking, session summarization, feedback analysis, visual echoing, photometric, image separation

Associated Center(s) / Consortia: Vision and Autonomous Systems Center
Associated Lab(s) / Group(s): Intelligent Desktop Group
Associated Project(s): Tele-Graffiti

Text Reference
Naoya Takao, Jianbo Shi, and Simon Baker, "Tele-Graffiti," tech. report CMU-RI-TR-02-10, Robotics Institute, Carnegie Mellon University, March, 2002

BibTeX Reference
   author = "Naoya Takao and Jianbo Shi and Simon Baker",
   title = "Tele-Graffiti",
   booktitle = "",
   institution = "Robotics Institute",
   month = "March",
   year = "2002",
   number= "CMU-RI-TR-02-10",
   address= "Pittsburgh, PA",