Standard presentation systems consisting of a laptop connected to a projector suffer from two problems: (1) the projected image appears distorted (keystoned) unless the projector is precisely aligned to the projection screen; (2) the speaker is forced to interact with the computer rather than the audience. This paper shows how the addition of an uncalibrated camera, aimed at the screen, solves both problems. Although the locations, orientations and optical parameters of the camera and projector are unknown, the projector-camera system calibrates itself by exploiting the homography between the projected slide and the camera image. Significant improvements are possible over passively calibrating systems since the projector actively manipulates the environment by placing feature points into the scene. For instance, using a low-resolution (160/spl times/120) camera, we can achieve an accuracy of /spl plusmn/3 pixels in a 1024/spl times/768 presentation slide. The camera-projector system infers models for the projector-to-camera and projector-to-screen mappings in order to provide two major benefits.


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    Titel :

    Smarter presentations: exploiting homography in camera-projector systems


    Beteiligte:
    Sukthankar, R. (Autor:in) / Stockton, R.G. (Autor:in) / Mullin, M.D. (Autor:in)


    Erscheinungsdatum :

    2001-01-01


    Format / Umfang :

    1105987 byte




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch



    Smarter Presentations: Exploiting Homography in Camera-Projector Systems

    Sukthankar, R. / Stockton, R. / Mullin, M. et al. | British Library Conference Proceedings | 2001


    Autocalibration of a Projector-Screen-Camera System: Theory and Algorithm for Screen-to-Camera Homography Estimation

    Okatani, T. / Deguchi, K. / IEEE | British Library Conference Proceedings | 2003



    Self-calibrating camera-projector systems for interactive displays and presentations

    Sukthankar, R. / Tat-Jen Cham, / Sukthankar, G. et al. | IEEE | 2001


    Self-Calibrating Camera-Projector Systems for Interactive Displays and Presentations

    Sukthankar, R. / Cham, T. / Sukthankar, G. et al. | British Library Conference Proceedings | 2001