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Name
CRS4 Open Archive
Type
Institutional Repository
Items
10 Publications
Compatibility
OpenAIRE 3.0 (OA, funding)
OAI-PMH
http://oai.crs4.it/oai/openaire
More information
Detailed data provider information (OpenDOAR)

 

  • Guided Robust Matte-Model Fitting for Accelerating Multi-light Reflectance Processing Techniques

    Pintus, Ruggero; Giachetti, Andrea; Pintore, Giovanni; Gobbetti, Enrico (2017)
    Projects: EC | Scan4Reco (665091)
    The generation of a basic matte model is at the core of many multi-light reflectance processing approaches, such as Photometric Stereo or Reflectance Transformation Imaging. To recover information on objects’ shape and appearance, the matte model is used directly or combined with specialized methods for modeling high-frequency behaviors. Multivariate robust regression offers a general solution to reliably extract the matte component when source data is heavily contaminated by shadows, inter-r...

    Multispectral RTI Analysis of Heterogeneous Artworks

    Giachetti, Andrea; Ciortan, Irina; Daffara, Claudia; Pintus, Ruggero; Gobbetti, Enrico (2017)
    Projects: EC | Scan4Reco (665091)
    We propose a novel multi-spectral reflectance transformation imaging (MS-RTI) framework for the acquisition and direct analysis of the reflectance behavior of heterogeneous artworks. Starting from free-form acquisitions, we compute per-pixel calibrated multi-spectral appearance profiles, which associate a reflectance value to each sampled light direction and frequency. Visualization, relighting, and feature extraction is performed directly on appearance profile data, applying scattered data i...

    A Novel Framework for Highlight Reflectance Transformation Imaging

    Giachetti, Andrea; Ciortan, Irina; Daffara, Claudia; Marchioro, Giacomo; Pintus, Ruggero; Gobbetti, Enrico (2017)
    Projects: EC | Scan4Reco (665091)
    We propose a novel pipeline and related software tools for processing the multi-light image collections (MLICs) acquired in different application contexts to obtain shape and appearance information of captured surfaces, as well as to derive compact relightable representations of them. Our pipeline extends the popular Highlight Reflectance Transformation Imaging (H-RTI) framework, which is widely used in the Cultural Heritage domain. We support, in particular, perspective camera modeling, per-...

    Artworks in the Spotlight: Characterization with a Multispectral Dome

    Ciortan, Irina; Dulecha, Tinsae; GIachetti, Andrea; Pintus, Ruggero; Jaspe Villanueva, Alberto; Gobbetti, Enrico (2018)
    Projects: EC | Scan4Reco (665091)
    We describe the design and realization of a novel multispectral light dome system and the associated software control and calibration tools used to process the acquired data, in a specialized pipeline geared towards the analysis of shape and appearance properties of cultural heritage items. The current prototype dome, built using easily available electronic and lighting components, can illuminate a target of size 20cm x 20cm from 52 directions uniformly distributed in a hemisphere. From each ...

    Automatic Algorithms for Medieval Manuscript Analysis

    Pintus, Ruggero; Yang, Ying; Rushmeier, Holly; Gobbetti, Enrico (2017)
    Projects: EC | Scan4Reco (665091)
    Massive digital acquisition and preservation of deteriorating historical and artistic documents is of particular importance due to their value and fragile condition. The study and browsing of such digital libraries is invaluable for scholars in the Cultural Heritage field, but requires automatic tools for analyzing and indexing these datasets. We will describe a set of completely automatic solutions to estimate per-page text leading, to extract text lines, blocks and other layout elements, an...
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