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Carnegie Mellon Robotics Institute

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Abstract

We analyze the feedback loop in Tele-Graffiti, a camera-projector based remote sketching system which we recently developed. We derive the gain through the feedback loop and the final images that will be viewed by the users of the system. We then derive the ``optimal gain'' as the gain that results in the final viewed images being as close as possible to the sum of the images actually drawn on the paper. We also propose a way of using the projector to compensate for insufficient ambient light and describe how our analysis is affected by: (1) automatic gain control (AGC) and (2) color imagery. We end by proposing an algorithm to decompose the final viewed images into estimates of the drawn images.

Notes

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, Simon Baker, and Jianbo Shi, "Steady-State Feedback Analysis of Tele-Graffiti," Proceedings of the IEEE International Workshop on Projector-Camera Systems, October, 2003.

BibTeX Reference

@inproceedings{Takao_2003_4472,
   author = "Naoya Takao and Simon Baker and Jianbo Shi",
   title = "Steady-State Feedback Analysis of Tele-Graffiti",
   booktitle = "Proceedings of the IEEE International Workshop on Projector-Camera Systems",
   month = "October",
   year = "2003",
}

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