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A Practical Reflectance Transformation Imaging Pipeline for Surface Characterization in Cultural Heritage

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dc.contributor ["European Union (EU)" and "Horizon 2020"] Ciortan, Irina Pintus, Ruggero Marchioro, Giacomo Daffara, Claudia Giachetti, Andrea Gobbetti, Enrico 2016-09-12T13:46:30Z 2016-09-12T13:46:30Z 2016-10
dc.description.abstract We present a practical acquisition and processing pipeline to characterize the surface structure of cultural heritage objects. Using a free-form Reflectance Transformation Imaging (RTI) approach, we acquire multiple digital photographs of the studied object shot from a stationary camera. In each photograph, a light is freely positioned around the object in order to cover a wide variety of illumination directions. Multiple reflective spheres and white Lambertian surfaces are added to the scene to automatically recover light positions and to compensate for non-uniform illumination. An estimation of geometry and reflectance parameters (e.g., albedo, normals, polynomial texture maps coefficients) is then performed to locally characterize surface properties. The resulting object description is stable and representative enough of surface features to reliably provide a characterization of measured surfaces. We validate our approach by comparing RTI-acquired data with data acquired with a high-resolution microprofilometer. en_US
dc.description.sponsorship Terms: "European Union (EU)" & "Horizon 2020" / Action: H2020-EU.3.6.3. - Reflective societies - cultural heritage and European identity / Acronym: Scan4Reco / Grant number: 665091 en_US
dc.language.iso en_US en_US
dc.publisher the Eurographics Association en_US
dc.relation info:eu-repo/grantAgreement/EC/H2020/665091/EU/Scan4Reco/Scan4Reco/
dc.rights the Eurographics Association
dc.rights.uri info:eu-repo/semantics/openAccess
dc.source The 13th Eurographics Worhshop on Graphics and Cultural Heritage 2016
dc.subject I.4.1 [Image processing and Computer Vision]: Digitization and Image Capture—Imaging Geometry en_US
dc.title A Practical Reflectance Transformation Imaging Pipeline for Surface Characterization in Cultural Heritage en_US
dc.type info:eu-repo/semantics/article en_US
dc.type info:eu-repo/semantics/acceptedVersion

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