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Shadowless Projection Mapping using Retrotransmissive Optics.

Kosuke Hiratani, Daisuke Iwai, Yuta Kageyama

    IEEE Transactions on Visualization and Computer Graphics
    |April 7, 2023
    PubMed
    Summary
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    This study introduces a novel shadowless projection mapping system to prevent occlusion issues in interactive applications. It uses a retrotransmissive plate for wide-angle projection and includes a spatial mask and computational algorithm to maintain image quality and enable touch sensing.

    Area of Science:

    • Computer Vision
    • Optical Engineering
    • Human-Computer Interaction

    Background:

    • Interactive projection mapping systems often suffer from occlusion caused by user bodies, leading to interrupted visual feedback.
    • Existing solutions may introduce latency or fail to address occlusion effectively in dynamic environments.

    Purpose of the Study:

    • To develop a delay-free optical solution for shadowless projection mapping that overcomes occlusion problems.
    • To enable interactive applications by integrating touch sensing capabilities into the projection system.

    Main Methods:

    • Utilized a large format retrotransmissive plate for wide viewing angle projection.
    • Implemented a spatial mask to mitigate stray light and contrast degradation inherent in retrotransmissive optics.
    • Developed a computational algorithm to optimize the spatial mask shape for balanced image quality.

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  • Leveraged the bidirectional optical property of the retrotransmissive plate for touch sensing.

    • Main Results:

    • Demonstrated a shadowless projection mapping system capable of projecting images without occlusion.
    • Successfully reduced stray light and improved contrast using the spatial mask and computational algorithm.
    • Validated the effectiveness of the integrated touch sensing technique for user interaction.
    • A proof-of-concept prototype confirmed the feasibility of the proposed techniques.

    Conclusions:

    • The proposed shadowless projection mapping system effectively addresses occlusion issues in interactive applications.
    • The integration of retrotransmissive optics, spatial masking, and computational algorithms offers a robust solution for high-quality projection.
    • The developed touch sensing capability enhances user interaction within projection-mapped environments.