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LiPro: displaying concurrent image viewing and imperceptible positioning using visible light.

Song Song, Xiangyu Liu, Xinghao Zhang

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    This study introduces LiPro, a smart lighting projector system. LiPro enables simultaneous imperceptible target positioning and image viewing, achieving centimeter-level accuracy for practical applications.

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    Area of Science:

    • Optoelectronics
    • Human-Computer Interaction
    • Computer Vision

    Background:

    • Visible light projectors are key for human interaction but struggle with simultaneous image viewing and precise target positioning.
    • Existing systems compromise either visual display quality or positioning accuracy, limiting real-world usability.

    Purpose of the Study:

    • To develop a novel projector system, LiPro, capable of displaying imperceptible target positioning alongside any image viewing.
    • To address the limitations of current visible light projectors in practical applications.

    Main Methods:

    • Proposed a novel color space conversion modulation scheme using YCbCr analysis to embed landmark information imperceptibly.
    • Developed a dual-channel decision demodulation scheme for accurate landmark recognition by processing R and B channels simultaneously.
    • Implemented the LiPro system using off-the-shelf devices for performance evaluation.

    Main Results:

    • The LiPro system successfully achieves simultaneous imperceptible target positioning and image viewing.
    • Experimental results demonstrate centimeter-level target positioning accuracy under diverse image viewing conditions.
    • The proposed modulation and demodulation schemes ensure human eye imperceptibility to luminance changes.

    Conclusions:

    • LiPro offers a practical solution for visible light projectors, overcoming previous limitations in simultaneous positioning and display.
    • The system's ability to provide accurate positioning without visual compromise opens new possibilities for interactive applications.
    • Centimeter-level positioning accuracy validates the effectiveness of the novel color space and demodulation techniques.