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In Vivo Quantification of Hip Arthrokinematics during Dynamic Weight-bearing Activities using Dual Fluoroscopy
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Dynamic Projection Mapping for Robust Sphere Posture Tracking Using Uniform/Biased Circumferential Markers.

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    This study introduces a novel circumferential marker for spatial augmented reality. This marker offers robust tracking of dynamic objects, overcoming limitations of conventional markers in challenging visual conditions.

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    Area of Science:

    • Computer Vision
    • Augmented Reality
    • Robotics

    Background:

    • Spatial augmented reality (SAR) systems require precise tracking of dynamic objects for advanced graphics presentation.
    • Conventional tracking markers struggle with occlusion, blurring, and wide-range movements, limiting SAR applications.
    • Existing methods lack robustness in real-world, dynamic scenarios.

    Purpose of the Study:

    • To develop a novel tracking marker system for spatial augmented reality that is robust against occlusion and blurring.
    • To enable high-speed, high-accuracy tracking of dynamic objects, including spheres, in complex environments.
    • To support real-time visualization and human interaction in widely dynamic projection mapping systems.

    Main Methods:

    • Introduction of a uniform circumferential marker that appears as an ellipse under perspective projection.
    • Development of a biased circumferential marker for embedding unique coding and absolute posture decoding.
    • Proposal of a novel recognition algorithm and rough initialization using multi-ellipse geometry for precise tracking.
    • Implementation of a high-speed, widely dynamic projection mapping system for real-time visualization.

    Main Results:

    • The proposed circumferential markers demonstrate high-speed, high-accuracy, and robust tracking of dynamically moving spheres.
    • The markers exhibit superior performance compared to conventional dot-based markers, especially under blurring and occlusion.
    • Continuous contour lines enable reliable tracking across a wide range of motion, including depth.
    • Real-time rotation visualization on a moving sphere surface was successfully achieved.

    Conclusions:

    • The developed circumferential marker system significantly enhances tracking capabilities in spatial augmented reality.
    • This innovation addresses key limitations of conventional markers, paving the way for more sophisticated SAR applications.
    • The system provides a robust foundation for dynamic projection mapping and human-computer interaction in complex visual environments.