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Now showing 1 - 6 of 6
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    TESTIMAGES: a Large-scale Archive for Testing Visual Devices and Basic Image Processing Algorithms
    (The Eurographics Association, 2014) Asuni, Nicola; Giachetti, Andrea; Andrea Giachetti
    We present the TESTIMAGES archive, a huge and free collection of sample images designed for analysis and quality assessment of different kinds of displays (i.e. monitors, televisions and digital cinema projectors) and image processing tecnhiques. The archive includes more than 2 million images originally acquired and divided in four different categories: SAMPLING and SAMPLING_PATTERNS (aimed at testing resampling algorithms), COLOR (aimed at testing color rendering on different displays) and PATTERNS (aimed at testing the rendering of standard geometrical patterns). The archive is currently online as a SourceForge project and, even if not yet publicized in the scientific community, it has already been used in different contexts and cited in scientific publications. We plan to extend the archive including datasets for other kinds of specific analyses.
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    A Practical Vision Based Approach to Unencumbered Direct Spatial Manipulation in Virtual Worlds
    (The Eurographics Association, 2007) Bettio, Fabio; Giachetti, Andrea; Gobbetti, Enrico; Marton, Fabio; Pintore, Giovanni; Raffaele De Amicis and Giuseppe Conti
    We present a practical approach for developing interactive environments that allows humans to interact with large complex 3D models without them having to manually operate input devices. The system provides support for scene manipulation based on hand tracking and gesture recognition and for direct 3D interaction with the 3D models in the display space if a suitably registered 3D display is used. Being based on markerless tracking of a user's two hands, the system does not require users to wear any input or output devices. 6DOF input is provided by using both hands simultaneously,making the tracker more robust since only tracking of position information is required. The effectiveness of the method is demonstrated with a simple application for model manipulation on a large stereo display, in which rendering constraints are met by employing state-of-the-art multiresolution techniques.
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    Towards Advanced Volumetric Display of the Human Musculoskeletal System
    (The Eurographics Association, 2008) Agus, Marco; Giachetti, Andrea; Gobbetti, Enrico; Guitián, José Antonio Iglesias; Marton, Fabio; Vittorio Scarano and Rosario De Chiara and Ugo Erra
    We report on our research results on effective volume visualization techniques for medical and anatomical data. Our volume rendering approach employs GPU accelerated out-of-core direct rendering algorithms to fully support high resolution, 16 bits, raw medical datasets as well as segmentation. Images can be presented on a special light field display based on projection technology. Human anatomical data appear to moving viewers floating in the light field display space and can be interactively manipulated.
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    Edge Adaptive and Energy Preserving Volume Upscaling for High Quality Volume Rendering
    (The Eurographics Association, 2010) Giachetti, Andrea; Guitián, J. A. Iglesias; Gobbetti, Enrico; Enrico Puppo and Andrea Brogni and Leila De Floriani
    We describe an edge-directed optimization-based method for volumetric data supersampling. The method is based on voxel splitting and iterative refinement performed with a greedy optimization driven by the smoothing of second order gray level derivatives and the assumption that the average gray level in the original voxels region cannot change. Due to these assumptions, the method, which is the 3D extension of a recently proposed technique, is particularly suitable for upscaling medical imaging data creating physically reasonable voxel values and overcoming the so-called partial volume effect. The good quality of the results obtained is demonstrated through experimental tests. Furthermore, we show how offline 3D upscaling of volumes can be coupled with recent techniques to perform high quality volume rendering of large datasets, obtaining a better inspection of medical volumetric data
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    3-SHIRT: Three-Dimensional Shape Indexing and Retrieval Techniques
    (The Eurographics Association, 2008) Castellani, Umberto; Cortelazzo, Guido Maria; Cristani, M.; Delponte, Elisabetta; Fusiello, Andrea; Giachetti, Andrea; Mizzaro, Stefano; Odone, Francesca; Puppo, Enrico; Scateni, Riccardo; Zanuttigh, Pietro; Vittorio Scarano and Rosario De Chiara and Ugo Erra
    This paper describes the work that has been done during the first year of the 3-SHIRT project, which aims at developing innovative solutions in all the phases of content-based 3D shape retrieval, namely: shape analysis and segmentation, design of shape descriptors, shape indexing and matching, and evaluation.
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    Frontmatter: Smart Tools and Applications in computer Graphics (STAG)
    (The Eurographics Association, 2015) Giachetti, Andrea; Biasotti, Silvia; Tarini, Marco; Andrea Giachetti and Silvia Biasotti and Marco Tarini