Examinando por Autor "Sinclair, Stephen"

Seleccione resultados tecleando las primeras letras
Mostrando 1 - 2 de 2
  • Miniatura
    Ítem
    Path Routing Optimization for STM Ultrasound Rendering
    (Institute of Electrical and Electronics Engineers, 2020-02) Barreiro, Hector; Sinclair, Stephen; Otaduy, Miguel A.
    Ultrasound transducer arrays are capable of producing tactile sensations on the hand, promising hands-free haptic interaction for virtual environments. However, controlling such an array with respect to reproducing a desired perceived interaction remains a challenging problem. In this work we approach this problem as a dynamic mapping of virtual interactions to existing control metaphors of ultrasound devices, namely, the modulation of focal point positions and intensities over time, a method known as Spatiotemporal Modulation (STM). In particular, we propose an optimization approach that takes into account known perceptual parameters and limitations of the STM method. This results in a set of focal point paths optimized to best reconstruct an arbitrary target pressure field.
  • Miniatura
    Ítem
    Ultrasound Rendering of Tactile Interaction with Fluids
    (IEEE World Haptics Conference (WHC), 2019) Barreiro, Héctor; Sinclair, Stephen; Otaduy, Miguel A.
    When we interact with fluid media, e.g., with our hands, we experience a spatially and temporally varying pressure field on our skin, which depends on the density and viscosity of the fluid, as well as the relative motion between our hands and the surrounding flow. Ultrasound phased arrays stimulate skin in mid air by controlling pressure waves at particular spatial locations. In this work, we explore the connection between the pressure-based stimulation of ultrasound haptics and the actual pressure field experienced when interacting with fluid media, to devise a novel algorithm for ultrasoundbasedrenderingoftactileinteractionwithfluids.Ouralgorithm extracts the target pressure field on a virtual hand from an interactive fluid simulation, and formulates the computation of the rendered pressure as an optimization problem. We have designed an efficient solver for this optimization problem, and we show results of interactive experiments with several fluid simulations.