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    Area of Science:

    • Computer Vision
    • Optical Engineering
    • Image Processing

    Background:

    • Projection mapping often suffers from cast shadows, degrading visual quality.
    • Large-aperture (LA) Fresnel lenses can suppress shadows but introduce optical aberrations like defocus blur and veiling glare.
    • Existing methods struggle to balance shadow suppression with maintaining high projected image resolution and contrast.

    Purpose of the Study:

    • To propose and validate a novel projection system for optically removing cast shadows in projection mapping.
    • To address the degradation in resolution and contrast caused by LA Fresnel lenses.
    • To achieve simultaneous shadow suppression and blur compensation.

    Main Methods:

    • Utilizing a large-aperture (LA) projection system with a large-format Fresnel lens for shadow suppression.
    • Introducing a secondary residual projector with a standard aperture lens on the same optical axis to compensate for attenuated high-frequency components.
    • Employing digital image processing to optimize projection image pairs for balanced shadow suppression and deblurring.

    Main Results:

    • The proposed system effectively suppresses cast shadows in projection mapping.
    • Simultaneous projection from LA and residual projectors compensates for aberrations, improving resolution and contrast.
    • Optimization of projection images demonstrated a balance between shadow suppression and deblurring performance.

    Conclusions:

    • The developed projection system successfully mitigates cast shadows while preserving image quality.
    • The dual-projector approach, combined with image optimization, offers a robust solution for projection mapping challenges.
    • Experimental validation and user study confirm the efficacy of the proposed optical and digital techniques.