CRS4 Report

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https://hdl.handle.net/11050/59
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Mostra il contenuto di CRS4 Report per Autore "Agus, Marco"

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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.
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    Hierarchical higher order face cluster radiosity
    (2002-03-29) Gobbetti, Enrico; Spanò, Leonardo; Agus, Marco
    We present an algorithm for simulating diffuse interreflection in scenes composed of highly tessellated objects. The method is a higher order extension of the face cluster radiosity technique. It combines face clustering, multiresolution visibility, vector radiosity, and higher order bases with a modified progressive shooting iteration to rapidly produce visually continuous solutions with limited memory requirements. The output of the method is a vector irradiance map that partitions input models into areas where global illumination is well approximated using the selected basis. The OpenGL register combiners extension can be used to render illuminated models directly from the vector irradiance map, exploiting hardware acceleration for computing vertex radiosity on commodity graphics boards.
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    IERAPSI. Petrous bone surgical simulation platform
    (2003-01) Agus, Marco; Giachetti, Andrea; Gobbetti, Enrico; Zanetti, Gianluigi; Zorcolo, Antonio
    This Report has been prepared in fulfilment of Deliverable D4.2, required as a result of Work Package 4 (Real time physically based surgical simulators) of the EU Framework V Project IERAPSI, An Integrated Environment for the Rehearsal and Planning of Surgical Interventions (IST-1999-12175) Deliverable D4.2 relates to the Petrous bone surgical simulation platform, the second and last of the two main expected results of Work Package 4. The present document provides a technical description of the software system produced. The report concludes with a bibliography of cited reference work. An accompanying video (available on the deliverable CD-ROM) further illustrates the petrous bone surgical simulation platform with live sequences comparing a real and a simulated surgical procedure performed on the temporal bone.
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    IERAPSI. Surgical simulator software kernel
    (2002-02) Agus, Marco; Giachetti, Andrea; Gobbetti, Enrico; Zanetti, Gianluigi
    This Report has been prepared in fulfilment of Deliverable D4.1, required as an intermediate result of Work Package 4 (Real time physically based surgical simulators) of the EU Framework V Project IERAPSI, An Integrated Environment for the Rehearsal and Planning of Surgical Interventions (IST-1999-12175). Deliverable D4.1 relates to the Surgical simulation software kernel, the first of the two main expected results of Work Package 4. The “Surgical simulation software kernel” will be used as the foundation upon which task T4.6 “Surgical simulator prototypes” will build deliverable D4.2, Petrous bone surgical simulation platform. The present document provides a technical description of the software system produced.
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    Visualizzazione volumetrica diretta interattiva con effetti di illuminazione mediante Register Combiner OpenGL
    (2003-06) Zorcolo, Antonio; Agus, Marco; Gobbetti, Enrico
    In diversi ambiti scientifici e industriali, la sempre più frequente acquisizione di dati volumetrici fa crescere la domanda di potenti tool per la loro visualizzazione, analisi e manipolazione interattiva. In questo rapporto presentiamo una tecnica di visualizzazione volumetrica diretta che consente l’applicazione del modello di illuminazione di Phong in tempo reale. La tecnica implementa il modello ottico di assorbimento + emissione eseguendo in tempo reale campionamento, mapping e integrazione delle proprietà ottiche esclusivamente attraverso funzionalità base di OpenGL 1.2. L’implementazione del modello di Phong, basato sul calcolo del gradiente di opacità, e eseguito in tempo reale utilizzando i Register Combiner. I vincoli del real-time sono soddisfatti anche grazie alla applicazione di una tecnica di accelerazione multipass basata sulla copia rapida di informazioni dal framebuffer alla memoria di texture, offerta già dalla versione 1.1 di OpenGL.