High-Speed Volumetric Capture for Vibration Propagation in the Human Body

This study developed a high-speed volumetric capture system combining a time-of-flight (ToF) camera and stereo high-speed cameras to measure 3-D vibration propagation in nonrigid objects. Stereo measurements with digital image correlation (DIC) enable precise, high-speed capture at hundreds of frames per second but need accurate tracking for large or nonrigid motions. ToF cameras measure absolute 3-D distances but lack the frame rate and resolution for submillimeter vibrations. Integrating ToF-based models with 3D-DIC enables precise, high-speed vibration measurement and frequency-domain analysis of vibration propagation in nonrigid objects like the human body. The system was validated by visualizing posture-based human balance motion differences during vibration machine tests.