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Optically hiding of tabletop information with polarized complementary image projection: your shadow reveals it!

Published: 13 November 2011 Publication History

Abstract

We propose the concept and implementation of a graphical information hiding technique for interactive tabletops where users can view the information by simply casting real shadows. We placed three projectors (one in the rear and two in the front) in such a way that the rear one projects graphical information onto a tabletop surface, and the front ones project a complementary image, so that the combined image displayed on the surface becomes uniformly gray, thus hiding the information from the viewer. Users can view the hidden information by blocking the light from the front projector, revealing the complementary image that is being projected onto the occluder. We use the other front projector and polarization filters to make the complementary image projected onto the occluder also uniformly gray. Because the technique completely relies on optical phenomena, users can interact with the system without suffering from any false recognitions or delays.

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Reference

[1]
Y. Minomo et al.: Transforming your shadow into colorful visual media: multiprojection of complementary colors, ACM CIE, vol. 4, no. 3, article no. 10, 2006.

Cited By

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  • (2014)Making Graphical Information Visible in Real Shadows on Interactive TabletopsIEEE Transactions on Visualization and Computer Graphics10.1109/TVCG.2014.231600220:9(1293-1302)Online publication date: 1-Sep-2014

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  1. Optically hiding of tabletop information with polarized complementary image projection: your shadow reveals it!

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    cover image ACM Conferences
    ITS '11: Proceedings of the ACM International Conference on Interactive Tabletops and Surfaces
    November 2011
    295 pages
    ISBN:9781450308717
    DOI:10.1145/2076354
    Permission to make digital or hard copies of part or all of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for profit or commercial advantage and that copies bear this notice and the full citation on the first page. Copyrights for third-party components of this work must be honored. For all other uses, contact the Owner/Author.

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    Association for Computing Machinery

    New York, NY, United States

    Publication History

    Published: 13 November 2011

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    Author Tags

    1. complementary color
    2. multi-projection
    3. shadow

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    ITS'11
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    ITS'11: Interactive Tabletops and Surfaces
    November 13 - 16, 2011
    Kobe, Japan

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    Overall Acceptance Rate 119 of 418 submissions, 28%

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    Cited By

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    • (2014)Making Graphical Information Visible in Real Shadows on Interactive TabletopsIEEE Transactions on Visualization and Computer Graphics10.1109/TVCG.2014.231600220:9(1293-1302)Online publication date: 1-Sep-2014

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