CRS4 Report

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https://hdl.handle.net/11050/59
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Mostra il contenuto di CRS4 Report per Subject "3D model"

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    A distributed heterogeneous image server
    (1998) Loddo, Sergio; Brelstaff, Gavin; Zanetti, Gianluigi
    Digital image transmission is now ubiquitous across computer networks and thus there is increasing pressure to allow access to medical image data at sites remote from PACS locations. In fact, it may soon make economic sense to outsource medical image services - to dedicated service providers at geographical locations outside of the traditional radiology department or HIS’s. The technical challenge faced by system developers is to produce client-Viewer/server-PACS configurations that can realistically span the network. In particular, the systems must provide the performance usually expected by client medics and it must be flexible to the needs of the service providers. At CRS4 - BioMedical Applications - we are integrating various technologies derived from the www-intranet field, and object-oriented middleware to prototype technological solutions that address both the issues of performance and flexibility. These are discussed in turn below; then we provide an overview of our system.
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    Creating and presenting real and artificial visual stimuli for the neurophysiological investigation of the observation/execution matching system
    (2000-06) Agus, Marco; Bettio, Fabio; Gobbetti, Enrico
    Recent neurophysiological experiments have shown that the visual stimuli that trigger a particular kind of neurons located in the ventral premotor cortex of monkeys and humans are very selective. These textitmirror neurons are activated when the hand of another individual interacts with an objects but are not activated when the actions, identical in purpose, are made by manipulated mechanical tools. A Human Frontiers Science Program project is investigating which are the parameters of the external stimuli that mirror neurons visually extract and match on their movement related activity. The planned neurophysiological experiments will require the presentation of digital stimuli of different kinds, including video sequences showing meaningful actions made by human hands, synthetic reproductions of the same actions made by realistic virtual hands, as well as variations of the same actions by controlled modifications of hand geometry and/or action kinematics. This paper presents the specialized animation system we have developed for the project.
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    Exploring virtual prototypes using time-critical rendering
    (1999-11) Gobbetti, Enrico; Scateni, Riccardo; Agus, Marco
    We present an application of our time-critical multiresolution rendering algorithm to the visual and possibly collaborative exploration of large digital mock-ups. Our technique relies upon a scene description in which objects are represented as multiresolution meshes. We perform a constrained optimization at each frame to choose the resolution of each potentially visible object that generates the best quality image while meeting timing constraints. We present numerical and pictorial results of the experiments performed that support our claim that we can maintain a xed frame-rate even when rendering very large datasets on low-end graphics PCs.