2008
Journal article
Open Access
Interactive rendering of dynamic geometry
Ponchio F., Hormann K.
Fluid simulations typically produce complex threedimensional iso-surfaces whose geometry and topology change over time. The standard way of representing such "dynamic geometry" is by a set of iso-surfaces that are extracted individually at certain time steps. An alternative strategy is to represent the whole sequence as a four-dimensional tetrahedral mesh. The iso-surface at a specific time step can then be computed by intersecting the tetrahedral mesh with a threedimensional hyperplane. This not only allows to animate the surface continuously over time without having to worry about the topological changes, but also enables simplification algorithms to exploit temporal coherence. We show how to interactively render such four-dimensional tetrahedral meshes by improving previous GPU-accelerated techniques and building an out-of-core multi-resolution structure based on quadric-error simplification. As a second application we apply our framework to time-varying surfaces that result from morphing one triangle mesh into another.Source: IEEE transactions on visualization and computer graphics 14 (2008): 914–925. doi:10.1109/TVCG.2008.35
DOI: 10.1109/tvcg.2008.35
Metrics:
Ponchio F., Hormann K.
Fluid simulations typically produce complex threedimensional iso-surfaces whose geometry and topology change over time. The standard way of representing such "dynamic geometry" is by a set of iso-surfaces that are extracted individually at certain time steps. An alternative strategy is to represent the whole sequence as a four-dimensional tetrahedral mesh. The iso-surface at a specific time step can then be computed by intersecting the tetrahedral mesh with a threedimensional hyperplane. This not only allows to animate the surface continuously over time without having to worry about the topological changes, but also enables simplification algorithms to exploit temporal coherence. We show how to interactively render such four-dimensional tetrahedral meshes by improving previous GPU-accelerated techniques and building an out-of-core multi-resolution structure based on quadric-error simplification. As a second application we apply our framework to time-varying surfaces that result from morphing one triangle mesh into another.Source: IEEE transactions on visualization and computer graphics 14 (2008): 914–925. doi:10.1109/TVCG.2008.35
DOI: 10.1109/tvcg.2008.35
Metrics:
See at:
IEEE Transactions on Visualization and Computer Graphics 
| IEEE Transactions on Visualization and Computer Graphics 
| ieeexplore.ieee.org | CNR ExploRA
2007
Software
Unknown
Virtual Inspector: un applicativo per la fruizione interattiva di beni culturali
Ponchio F.
Il sistema Virtual Inspector consente all'utente non esperto di visualizzare un modello geometrico di grandi dimensioni interattivamente su standard pc. VI present il modello e tutti i dati multimediali che sono collegati a punti della superficie. VI impiega una interfaccia utente facile da utilizzare, basata sulla metafore point and click. L'efficienza in visualizzazione è ottenuta, senza sacrificare la qualità, utilizzando techniche allo stato dell'arte sulla rappresentazione a livello di dettaglio. Infine, l'uso di una codific aXML per la struttura dell GUI rende VI flessibile e facilmente configurabile
Ponchio F.
Il sistema Virtual Inspector consente all'utente non esperto di visualizzare un modello geometrico di grandi dimensioni interattivamente su standard pc. VI present il modello e tutti i dati multimediali che sono collegati a punti della superficie. VI impiega una interfaccia utente facile da utilizzare, basata sulla metafore point and click. L'efficienza in visualizzazione è ottenuta, senza sacrificare la qualità, utilizzando techniche allo stato dell'arte sulla rappresentazione a livello di dettaglio. Infine, l'uso di una codific aXML per la struttura dell GUI rende VI flessibile e facilmente configurabile
See at: CNR ExploRA
2016
Conference article
Unknown
Teaching (digital) epigraphy
Lamé M., Ponchio F., Radman-Livaja I., Robertson B.
Although having the experience of directly manipulating an ancient textbearing artifact is important for developing the skills of an epigrapher - an experience that books and photo cannot replace - such access to primary sources is often problematic. In this article we present our experience with teaching students to transcribe and interpret Roman inscribed lead tags, using a Digital Autoptic Process (DAP) in a Web environment, so to develop basic competences in epigraphy and digital epigraphy.Source: Europeana network of Ancient Greek and Latin Epigraphy. Second International Conference, pp. 267–282, Rome, Italy, 27-29 January 2016
Lamé M., Ponchio F., Radman-Livaja I., Robertson B.
Although having the experience of directly manipulating an ancient textbearing artifact is important for developing the skills of an epigrapher - an experience that books and photo cannot replace - such access to primary sources is often problematic. In this article we present our experience with teaching students to transcribe and interpret Roman inscribed lead tags, using a Digital Autoptic Process (DAP) in a Web environment, so to develop basic competences in epigraphy and digital epigraphy.Source: Europeana network of Ancient Greek and Latin Epigraphy. Second International Conference, pp. 267–282, Rome, Italy, 27-29 January 2016
See at: CNR ExploRA
2019
Conference article
Open Access
Heterotoki: Non-structured and heterogeneous terminology alignment for Digital Humanities data producers
Lame M., Pittet P., Ponchio F., Markhoff B., Sanfilippo E. M.
In this paper, we present an online communication-driven decision support system to align terms from a dataset with terms of another dataset (standardized controlled vocabulary or not). Heterotoki differs from existing proposals in that it takes place at the interface with humans, inviting the experts to commit on their definitions, so as to either agree to validate the mapping or to propose some enrichment to the terminologies. More precisely, differently to most of existing proposals that support terminology alignment, Heterotoki sustains the negotiation of meaning thanks to semantic coordination support within its interface design. This negotiation involves domain experts having produced multiple datasets.Source: ODOCH 2019 - Open Data and Ontologies for Cultural Heritage, pp. 37–48, Rome, Italy, 3 June, 2019
Lame M., Pittet P., Ponchio F., Markhoff B., Sanfilippo E. M.
In this paper, we present an online communication-driven decision support system to align terms from a dataset with terms of another dataset (standardized controlled vocabulary or not). Heterotoki differs from existing proposals in that it takes place at the interface with humans, inviting the experts to commit on their definitions, so as to either agree to validate the mapping or to propose some enrichment to the terminologies. More precisely, differently to most of existing proposals that support terminology alignment, Heterotoki sustains the negotiation of meaning thanks to semantic coordination support within its interface design. This negotiation involves domain experts having produced multiple datasets.Source: ODOCH 2019 - Open Data and Ontologies for Cultural Heritage, pp. 37–48, Rome, Italy, 3 June, 2019
See at:
ceur-ws.org | ISTI Repository | CNR ExploRA
2020
Journal article
Open Access
Neural reflectance transformation imaging
Dulecha T. G., Fanni F. A., Ponchio F., Pellacini F., Giachetti A.
Reflectance transformation imaging (RTI) is a computational photography technique widely used in the cultural heritage and material science domains to characterize relieved surfaces. It basically consists of capturing multiple images from a fixed viewpoint with varying lights. Handling the potentially huge amount of information stored in an RTI acquisition that consists typically of 50-100 RGB values per pixel, allowing data exchange, interactive visualization, and material analysis, is not easy. The solution used in practical applications consists of creating "relightable images" by approximating the pixel information with a function of the light direction, encoded with a small number of parameters. This encoding allows the estimation of images relighted from novel, arbitrary lights, with a quality that, however, is not always satisfactory. In this paper, we present NeuralRTI, a framework for pixel-based encoding and relighting of RTI data. Using a simple autoencoder architecture, we show that it is possible to obtain a highly compressed representation that better preserves the original information and provides increased quality of virtual images relighted from novel directions, especially in the case of challenging glossy materials. We also address the problem of validating the relight quality on different surfaces, proposing a specific benchmark, SynthRTI, including image collections synthetically created with physical-based rendering and featuring objects with different materials and geometric complexity. On this dataset and as well on a collection of real acquisitions performed on heterogeneous surfaces, we demonstrate the advantages of the proposed relightable image encoding.Source: The visual computer (2020): 2161–2174. doi:10.1007/s00371-020-01910-9
DOI: 10.1007/s00371-020-01910-9
Metrics:
Dulecha T. G., Fanni F. A., Ponchio F., Pellacini F., Giachetti A.
Reflectance transformation imaging (RTI) is a computational photography technique widely used in the cultural heritage and material science domains to characterize relieved surfaces. It basically consists of capturing multiple images from a fixed viewpoint with varying lights. Handling the potentially huge amount of information stored in an RTI acquisition that consists typically of 50-100 RGB values per pixel, allowing data exchange, interactive visualization, and material analysis, is not easy. The solution used in practical applications consists of creating "relightable images" by approximating the pixel information with a function of the light direction, encoded with a small number of parameters. This encoding allows the estimation of images relighted from novel, arbitrary lights, with a quality that, however, is not always satisfactory. In this paper, we present NeuralRTI, a framework for pixel-based encoding and relighting of RTI data. Using a simple autoencoder architecture, we show that it is possible to obtain a highly compressed representation that better preserves the original information and provides increased quality of virtual images relighted from novel directions, especially in the case of challenging glossy materials. We also address the problem of validating the relight quality on different surfaces, proposing a specific benchmark, SynthRTI, including image collections synthetically created with physical-based rendering and featuring objects with different materials and geometric complexity. On this dataset and as well on a collection of real acquisitions performed on heterogeneous surfaces, we demonstrate the advantages of the proposed relightable image encoding.Source: The visual computer (2020): 2161–2174. doi:10.1007/s00371-020-01910-9
DOI: 10.1007/s00371-020-01910-9
Metrics:
See at:
The Visual Computer | link.springer.com | The Visual Computer | ISTI Repository | CNR ExploRA
2022
Journal article
Open Access
A toolbox for measuring heterogeneity and efficiency using zonotopes
Cococcioni M., Grazzi M., Li L., Ponchio F.
In this work, we describe the new command zonotope, which, by resorting to a geometry-based approach, provides a measure of productivity that fully accounts for the existing heterogeneity across firms within the same industry. The method we propose also enables assessment of the extent of multidimensional heterogeneity with applications to fields beyond that of production analysis. Finally, we detail the functioning of the software to perform the related empirical analysis, and we discuss the main computational issues encountered in its development.Source: The Stata journal 22 (2022): 25–59. doi:10.1177/1536867X221083854
DOI: 10.1177/1536867x221083854
Project(s): ISIGrowth
Metrics:
Cococcioni M., Grazzi M., Li L., Ponchio F.
In this work, we describe the new command zonotope, which, by resorting to a geometry-based approach, provides a measure of productivity that fully accounts for the existing heterogeneity across firms within the same industry. The method we propose also enables assessment of the extent of multidimensional heterogeneity with applications to fields beyond that of production analysis. Finally, we detail the functioning of the software to perform the related empirical analysis, and we discuss the main computational issues encountered in its development.Source: The Stata journal 22 (2022): 25–59. doi:10.1177/1536867X221083854
DOI: 10.1177/1536867x221083854
Project(s): ISIGrowth
Metrics:
See at:
ISTI Repository | The Stata Journal Promoting communications on statistics and Stata | Archivio della Ricerca - Università di Pisa | journals.sagepub.com | CNR ExploRA
2023
Conference article
Open Access
Ancient coins' surface inspection with web-based neural RTI visualization
Righetto L., Gobbetti E., Ponchio F., Traviglia A., De Bernardin M., Giachetti A.
The use of neural encodings has the potential to replace the commonly used polynomial fitting in the analysis of artwork surface based on Reflectance Transformation Imaging (RTI), as it has proved to result in more compact encoding with better relight quality, but it is still not widely used due to the lack of efficient implementations available to practitioners. In this work, we describe an optimized system to encode/decode neural relightable images providing interactive visualization in a web interface allowing multi-layer visualization and annotation. To develop it, we performed several experiments testing different decoder architectures and input processing pipelines, evaluating the quality of the results on specific benchmarks to find the optimal tradeoff between relighting quality and efficiency. A specific decoder has been then implemented for the web and integrated into an advanced visualisation tool. The system has been tested for the analysis of a group of ancient Roman bronze coins that present scarce readability and varying levels of preservation and that have been acquired with a multispectral light dome. Their level of corrosion and degradation, which in some cases hinders the recognition of the images, numerals, or text represented on them, makes the system testing particularly challenging and complex. Testing on such a real case scenario, however, enables us to determine the actual improvement that this new RTI visualization tool can offer to numismatists in their ability to identify the coins.Source: SPIE Optical Metrology, pp. 12620:0D, Munich, Germany, 26-29/06/2023
DOI: 10.1117/12.2674888
Metrics:
Righetto L., Gobbetti E., Ponchio F., Traviglia A., De Bernardin M., Giachetti A.
The use of neural encodings has the potential to replace the commonly used polynomial fitting in the analysis of artwork surface based on Reflectance Transformation Imaging (RTI), as it has proved to result in more compact encoding with better relight quality, but it is still not widely used due to the lack of efficient implementations available to practitioners. In this work, we describe an optimized system to encode/decode neural relightable images providing interactive visualization in a web interface allowing multi-layer visualization and annotation. To develop it, we performed several experiments testing different decoder architectures and input processing pipelines, evaluating the quality of the results on specific benchmarks to find the optimal tradeoff between relighting quality and efficiency. A specific decoder has been then implemented for the web and integrated into an advanced visualisation tool. The system has been tested for the analysis of a group of ancient Roman bronze coins that present scarce readability and varying levels of preservation and that have been acquired with a multispectral light dome. Their level of corrosion and degradation, which in some cases hinders the recognition of the images, numerals, or text represented on them, makes the system testing particularly challenging and complex. Testing on such a real case scenario, however, enables us to determine the actual improvement that this new RTI visualization tool can offer to numismatists in their ability to identify the coins.Source: SPIE Optical Metrology, pp. 12620:0D, Munich, Germany, 26-29/06/2023
DOI: 10.1117/12.2674888
Metrics:
See at:
ISTI Repository | www.spiedigitallibrary.org | doi.org | CNR ExploRA
2011
Conference article
Restricted
3D-centered media linking and semantic enrichment through integrated searching, browsing, viewing and annotating
Pena Serna S., Scopigno R., Doerr M., Theodoridou M., Georgis C., Ponchio F, Stork A.
The digitally documented world heritage is archived in databases or repositories, where collections of metadata, images, multimedia objects or nowadays even digital 3D artifacts can be stored and queried. Modeling and linking all this information is complex and involves refined categorizations and relations, which are usually accessed by either simplistic or overwhelmingly complex interfaces. Hence, finding the right level of abstraction for a general interface is very challenging. This becomes even more demanding, if in addition to collection exploration, semantic enrichment is required. This work focuses on the design and implementation of an integrated interface, in which four dedicated activities are combined and provided: i) flexible definition of relational queries, ii) browsing of multiple results and query refinement, iii) inspection and analysis of multimedia objects, and iv) building and enrichment of semantic relationships (data paths) between objects. This integrated interface can handle different kinds of multimedia objects, allowing for querying and annotating text, 2D images or 3D artifacts. We present the software design of this interface and the corresponding underlying model in the semantic network. This work is a general step toward interfacing to 3D Linked Open Data.Source: The 12th International Symposium on Virtual Reality, Archaeology and Cultural Heritage, VAST 2011, pp. 89–96, Prato, 8-11 October 2011
DOI: 10.2312/vast/vast11/089-096
Project(s): 3D-COFORM
Metrics:
Pena Serna S., Scopigno R., Doerr M., Theodoridou M., Georgis C., Ponchio F, Stork A.
The digitally documented world heritage is archived in databases or repositories, where collections of metadata, images, multimedia objects or nowadays even digital 3D artifacts can be stored and queried. Modeling and linking all this information is complex and involves refined categorizations and relations, which are usually accessed by either simplistic or overwhelmingly complex interfaces. Hence, finding the right level of abstraction for a general interface is very challenging. This becomes even more demanding, if in addition to collection exploration, semantic enrichment is required. This work focuses on the design and implementation of an integrated interface, in which four dedicated activities are combined and provided: i) flexible definition of relational queries, ii) browsing of multiple results and query refinement, iii) inspection and analysis of multimedia objects, and iv) building and enrichment of semantic relationships (data paths) between objects. This integrated interface can handle different kinds of multimedia objects, allowing for querying and annotating text, 2D images or 3D artifacts. We present the software design of this interface and the corresponding underlying model in the semantic network. This work is a general step toward interfacing to 3D Linked Open Data.Source: The 12th International Symposium on Virtual Reality, Archaeology and Cultural Heritage, VAST 2011, pp. 89–96, Prato, 8-11 October 2011
DOI: 10.2312/vast/vast11/089-096
Project(s): 3D-COFORM
Metrics:
See at: CNR ExploRA
2011
Report
Open Access
PileBars: scalable dynamic thumbnail bars
Brivio Paolo, Ponchio Federico, Tarini Marco, Cignoni Paolo
We introduce PileBars, a new class of animated thumbnail-bars aimed at easing the browsing of very large image datasets (thousands of images). Since the bar is meant to be just one element of a GUI, it covers only a small portion of the screen; yet it provides a global view of the entire dataset, without any scrolling panels. Instead, thumbnails are dynamically rearranged, resized and reclustered into adaptive layouts during the entire browsing process. The objective is to make the user able, at the same time, to accurately pinpoint a specific image (even among semantically close ones), and to jump anywhere to "distant" parts of the dataset. The used thumbnail layouts also maximize temporal coherence, thus allowing for smooth animations from one layout to the next. The system is very general: it can be driven by any application-specific image-to-image semantic distance function, and respects any user-defined total ordering of the images; the ordering can be either inferred from the semantic or be chosen independently from it, depending on the application. The applicability of the resulting system is tested in a number of practical applications: browsing image collections from the web or personal achieves; navigation of 3D virtual scenes based on calibrated pictures; selection of a frame in a movie. In each test scenario, proper distance and ordering functions are fed to the system.Source: ISTI Technical reports, 2011
Brivio Paolo, Ponchio Federico, Tarini Marco, Cignoni Paolo
We introduce PileBars, a new class of animated thumbnail-bars aimed at easing the browsing of very large image datasets (thousands of images). Since the bar is meant to be just one element of a GUI, it covers only a small portion of the screen; yet it provides a global view of the entire dataset, without any scrolling panels. Instead, thumbnails are dynamically rearranged, resized and reclustered into adaptive layouts during the entire browsing process. The objective is to make the user able, at the same time, to accurately pinpoint a specific image (even among semantically close ones), and to jump anywhere to "distant" parts of the dataset. The used thumbnail layouts also maximize temporal coherence, thus allowing for smooth animations from one layout to the next. The system is very general: it can be driven by any application-specific image-to-image semantic distance function, and respects any user-defined total ordering of the images; the ordering can be either inferred from the semantic or be chosen independently from it, depending on the application. The applicability of the resulting system is tested in a number of practical applications: browsing image collections from the web or personal achieves; navigation of 3D virtual scenes based on calibrated pictures; selection of a frame in a movie. In each test scenario, proper distance and ordering functions are fed to the system.Source: ISTI Technical reports, 2011
See at:
ISTI Repository | CNR ExploRA
2012
Conference article
Unknown
CENOBIUM - A project for the multimedia representation of romanesque cloister capitals in the Mediterranean region
Dercks U., Ponchio F., Scopigno R.
The online project CENOBIUM is a multimedia presentation of Romanesque cloister capitals. High-resolution digital photographs and 3D models will virtually link the capitals to their original surroundings, thus representing them within their original architectural and conceptual contexts. The project has the central aim to study artistic exchange in the twelfth and thirteenth centuries in architectural decoration. The first multimedia and multilingual online phase of the project has been freely accessible on the internet since 2007. The last update focused inter alia in an improved visualization and optimized interactivity of the 3D models by integrating WebGL technology.Source: EVA Berlin 2012 - Elektronische Medien & Kunst, Kultur, Historie, pp. 1–16, Berlin, Germany, 07-09/11 2012
Dercks U., Ponchio F., Scopigno R.
The online project CENOBIUM is a multimedia presentation of Romanesque cloister capitals. High-resolution digital photographs and 3D models will virtually link the capitals to their original surroundings, thus representing them within their original architectural and conceptual contexts. The project has the central aim to study artistic exchange in the twelfth and thirteenth centuries in architectural decoration. The first multimedia and multilingual online phase of the project has been freely accessible on the internet since 2007. The last update focused inter alia in an improved visualization and optimized interactivity of the 3D models by integrating WebGL technology.Source: EVA Berlin 2012 - Elektronische Medien & Kunst, Kultur, Historie, pp. 1–16, Berlin, Germany, 07-09/11 2012
See at: CNR ExploRA
2015
Conference article
Open Access
Fast decompression for web-based view-dependent 3D rendering
Ponchio F., Dellepiane M.
Efficient transmission of 3D data to Web clients and mobile applications remains a challenge due to limited bandwidth. Most of the research focus in the context of mesh compression has been on improving compression ratio. However, in this context the use of Javascript on the Web and low power CPUS in mobile applications led to critical computational costs. Progressive decoding improves the user experience by providing a simplified version of the model that refines with time, and it's able to mask latency. Current approaches do so at very poor compression rates or at additional computational cost. The need for better performing algorithms is especially evident with this class of methods where Limper [Limper et al. 2013b] demonstrated how decoding time becomes a limiting factor even at moderately low bandwidths. In this paper we present a novel multi-resolution WebGL based rendering algorithm which combines progressive loading, view-dependent resolution and mesh compression, providing high frame rates and a decoding speed of million of triangles per second in Javascript. This method is parallelizable, robust to non-manifold meshes, and scalable to very large models.Source: 20th International Conference on 3D Web Technology, pp. 199–207, Heraklion, Crete, Greece, 18-21/06/2015
DOI: 10.1145/2775292.2775308
Project(s): HARVEST4D
Metrics:
Ponchio F., Dellepiane M.
Efficient transmission of 3D data to Web clients and mobile applications remains a challenge due to limited bandwidth. Most of the research focus in the context of mesh compression has been on improving compression ratio. However, in this context the use of Javascript on the Web and low power CPUS in mobile applications led to critical computational costs. Progressive decoding improves the user experience by providing a simplified version of the model that refines with time, and it's able to mask latency. Current approaches do so at very poor compression rates or at additional computational cost. The need for better performing algorithms is especially evident with this class of methods where Limper [Limper et al. 2013b] demonstrated how decoding time becomes a limiting factor even at moderately low bandwidths. In this paper we present a novel multi-resolution WebGL based rendering algorithm which combines progressive loading, view-dependent resolution and mesh compression, providing high frame rates and a decoding speed of million of triangles per second in Javascript. This method is parallelizable, robust to non-manifold meshes, and scalable to very large models.Source: 20th International Conference on 3D Web Technology, pp. 199–207, Heraklion, Crete, Greece, 18-21/06/2015
DOI: 10.1145/2775292.2775308
Project(s): HARVEST4D
Metrics:
See at:
ISTI Repository | dl.acm.org | doi.org | CNR ExploRA
2016
Journal article
Open Access
Multiresolution and fast decompression for optimal web-based rendering
Ponchio F., Dellepiane M.
Limited bandwidth is a strong constraint when efficient transmission of 3D data to Web clients and mobile applications is needed. In this paper we present a novel multi-resolution WebGL based rendering algorithm which combines progressive loading, view-dependent resolution and mesh compression, providing high frame rates and a decoding speed of million of triangles per second in JavaScript. The method is parallelizable and scalable to very large models. The algorithm is based on the local multi-resolution approaches provided by the community, but ad-hoc solutions had to be studied and implemented to provide adequate performances. In particular, a compression mechanism that reached very high compression rate without impact on rendering performance was implemented. Moreover, the data partition strategy was modified in order to be able to load different types of data (i.e. point clouds) and better adapt to the potentials and limitations of web-based rendering.Source: Graphical models (Print) 88 (2016): 1–11. doi:10.1016/j.gmod.2016.09.002
DOI: 10.1016/j.gmod.2016.09.002
Project(s): ARIADNE, HARVEST4D
Metrics:
Ponchio F., Dellepiane M.
Limited bandwidth is a strong constraint when efficient transmission of 3D data to Web clients and mobile applications is needed. In this paper we present a novel multi-resolution WebGL based rendering algorithm which combines progressive loading, view-dependent resolution and mesh compression, providing high frame rates and a decoding speed of million of triangles per second in JavaScript. The method is parallelizable and scalable to very large models. The algorithm is based on the local multi-resolution approaches provided by the community, but ad-hoc solutions had to be studied and implemented to provide adequate performances. In particular, a compression mechanism that reached very high compression rate without impact on rendering performance was implemented. Moreover, the data partition strategy was modified in order to be able to load different types of data (i.e. point clouds) and better adapt to the potentials and limitations of web-based rendering.Source: Graphical models (Print) 88 (2016): 1–11. doi:10.1016/j.gmod.2016.09.002
DOI: 10.1016/j.gmod.2016.09.002
Project(s): ARIADNE
, HARVEST4D Metrics:
See at:
ISTI Repository | Graphical Models | www.sciencedirect.com | CNR ExploRA
2018
Journal article
Open Access
CENOBIUM 10 years after: an evolving platform for Digital Humanities
Dercks U., Ponchio F., Scopigno R.
The Authors present CENOBIUM, a web-based system designed to support the work of art historians. It provides access to multimedia content and related descriptive text on a specific topic: capitals in Romanesque cloisters. This paper discusses the motivation behind the decision to develop this web resource, taken more than ten years ago. It describes the initial design of the often system and how it evolved to keep pace with technological developments. In a context where the results of ICT & CH projects (digital tools, websites) have life span barely exceeding the timeframe of the actual project, CENOBIUM can be considered a success. It has been operating and steadily been updated with new content and latest technologies throughout its decade-long life.Source: Archeologia e calcolatori 2018 (2018): 123–141. doi:10.19282/ACS.10.2018.08
DOI: 10.19282/acs.10.2018.08
Metrics:
Dercks U., Ponchio F., Scopigno R.
The Authors present CENOBIUM, a web-based system designed to support the work of art historians. It provides access to multimedia content and related descriptive text on a specific topic: capitals in Romanesque cloisters. This paper discusses the motivation behind the decision to develop this web resource, taken more than ten years ago. It describes the initial design of the often system and how it evolved to keep pace with technological developments. In a context where the results of ICT & CH projects (digital tools, websites) have life span barely exceeding the timeframe of the actual project, CENOBIUM can be considered a success. It has been operating and steadily been updated with new content and latest technologies throughout its decade-long life.Source: Archeologia e calcolatori 2018 (2018): 123–141. doi:10.19282/ACS.10.2018.08
DOI: 10.19282/acs.10.2018.08
Metrics:
See at:
ISTI Repository | www.progettocaere.rm.cnr.it | CNR ExploRA
2018
Conference article
Open Access
Visualizing and transcribing complex writings through RTI
Ponchio F., Lamè M., Scopigno R., Robertson B.
This paper presents our digital publishing process and its editing system developed for a specific use case - the scholarly digital edition of a set of Roman inscribed lead tags - but suited for analyzing a broad variety of text-bearing objects. This pipeline covers the spectrum of the activities from data acquisition of the visual aspects to complex analysis of the writings and text of incised inscriptions. It employs a twodimensional medium, Reflection Transformation Images (RTI), to support visual analysis. The visual and textual data it generates are open access, ready to be used for machine learning processes.Source: CiST 2018 - IEEE 5th International Congress on Information Science and Technology, pp. 227–231, Marrakech, Marocco, 22-24 October 2018
DOI: 10.1109/cist.2018.8596602
Metrics:
Ponchio F., Lamè M., Scopigno R., Robertson B.
This paper presents our digital publishing process and its editing system developed for a specific use case - the scholarly digital edition of a set of Roman inscribed lead tags - but suited for analyzing a broad variety of text-bearing objects. This pipeline covers the spectrum of the activities from data acquisition of the visual aspects to complex analysis of the writings and text of incised inscriptions. It employs a twodimensional medium, Reflection Transformation Images (RTI), to support visual analysis. The visual and textual data it generates are open access, ready to be used for machine learning processes.Source: CiST 2018 - IEEE 5th International Congress on Information Science and Technology, pp. 227–231, Marrakech, Marocco, 22-24 October 2018
DOI: 10.1109/cist.2018.8596602
Metrics:
See at:
ieeexplore.ieee.org | ISTI Repository | doi.org | CNR ExploRA
2020
Journal article
Open Access
Real-World textured things: a repository of textured models generated with modern photo-reconstruction tools
Maggiordomo A., Ponchio F., Cignoni P., Tarini M.
We are witnessing a proliferation of textured 3D models captured from the real world with automatic photo-reconstruction tools by people and professionals without a proper technical background in computer graphics. Digital 3D models of this class come with a unique set of characteristics and defects - especially concerning their parametrization - setting them starkly apart from 3D models originating from other, more traditional, sources. We study this class of 3D models by collecting a significant number of representatives and quantitatively evaluating their quality according to several metrics. These include a new invariant metric we carefully design to assess the amount of fragmentation of the UV map, which is one of the main weaknesses potentially hindering the usability of these models. Our results back the widely shared notion that models of this new class are still not fit for direct use in downstream applications (such as videogames), and require challenging processing steps. Regrettably, existing automatic geometry processing tools are not always up to the task: for example, we verify that the available tools for UV optimization often fail due to mesh inconsistencies, geometric and topological noise, excessive resolution, or other factors; moreover, even when an output is produced, it rarely represents a significant improvement over the input (according to the aforementioned measures). Therefore, we argue that further advancements are required by the computer graphics and geometry processing communities specifically targeted at this class of models. Towards this goal, we share the models we collected in this study as a new public repository, Real-World Textured Things (RWTT), intended as a benchmark to systematic field-test and compare future algorithms. RWTT consists of 568 carefully selected textured 3D models representative of the most popular photo-reconstruction tools currently available. We also provide a web interface to browse the dataset by the metadata we collected during our experiments and a tool, TexMetro, to compute the same set of measures on generic UV mapped datasets.Source: Computer aided geometric design 83 (2020). doi:10.1016/j.cagd.2020.101943
DOI: 10.1016/j.cagd.2020.101943
DOI: 10.48550/arxiv.2004.14753
Project(s): ENCORE
Metrics:
Maggiordomo A., Ponchio F., Cignoni P., Tarini M.
We are witnessing a proliferation of textured 3D models captured from the real world with automatic photo-reconstruction tools by people and professionals without a proper technical background in computer graphics. Digital 3D models of this class come with a unique set of characteristics and defects - especially concerning their parametrization - setting them starkly apart from 3D models originating from other, more traditional, sources. We study this class of 3D models by collecting a significant number of representatives and quantitatively evaluating their quality according to several metrics. These include a new invariant metric we carefully design to assess the amount of fragmentation of the UV map, which is one of the main weaknesses potentially hindering the usability of these models. Our results back the widely shared notion that models of this new class are still not fit for direct use in downstream applications (such as videogames), and require challenging processing steps. Regrettably, existing automatic geometry processing tools are not always up to the task: for example, we verify that the available tools for UV optimization often fail due to mesh inconsistencies, geometric and topological noise, excessive resolution, or other factors; moreover, even when an output is produced, it rarely represents a significant improvement over the input (according to the aforementioned measures). Therefore, we argue that further advancements are required by the computer graphics and geometry processing communities specifically targeted at this class of models. Towards this goal, we share the models we collected in this study as a new public repository, Real-World Textured Things (RWTT), intended as a benchmark to systematic field-test and compare future algorithms. RWTT consists of 568 carefully selected textured 3D models representative of the most popular photo-reconstruction tools currently available. We also provide a web interface to browse the dataset by the metadata we collected during our experiments and a tool, TexMetro, to compute the same set of measures on generic UV mapped datasets.Source: Computer aided geometric design 83 (2020). doi:10.1016/j.cagd.2020.101943
DOI: 10.1016/j.cagd.2020.101943
DOI: 10.48550/arxiv.2004.14753
Project(s): ENCORE
Metrics:
See at:
arXiv.org e-Print Archive | Computer Aided Geometric Design | Archivio Istituzionale della Ricerca dell'Università degli Studi di Milano | Computer Aided Geometric Design | doi.org | www.sciencedirect.com | CNR ExploRA
2012
Other
Unknown
Breve presentazione del database di supporto al sito WEB dell'ISTI
Beltrame R., Ponchio F., Raviolo C.
The ISTI website uses a database to store information presented on its pages. We sketch here the structure of this database.
Beltrame R., Ponchio F., Raviolo C.
The ISTI website uses a database to store information presented on its pages. We sketch here the structure of this database.
See at: CNR ExploRA
2008
Journal article
Restricted
Mapping highly detailed colour information on extremely dense 3D models: the case of David's restoration
Dellepiane M., Callieri M., Ponchio F., Scopigno R.
The support of advanced information technology (IT) to preservation, restoration and documentation of Cultural Heritage (CH) is becoming a very important goal for the research community. Michelangelo's David was one of the first applications of 3D scanning technology on a highly popular work of art. The subsequent restoration campaign, started in 2002 and concluded in 2004, was also a milestone for the adoption of modern scientific analysis procedures and IT tools in the framework of a restoration process. One of the focuses in this restoration was also methodological, i.e. to plan and adopt innovative ways to document the restoration process. In this paper, we present the results of an integration of different restoration data (2D and 3D datasets) which has been concluded recently. The recent evolution of HW and SW graphics technologies gave us the possibility to interactively visualize an extremely dense 3D model which incorporates the colour information provided by two professional photographic campaigns, made before and after the restoration. Moreover, we present the results concerning the mapping, in this case on the 2D media, of the reliefs produced by restorers to assess and document the status of the marble surface before the restoration took place. This result could lead to new and fascinating applications of computer graphics for preservation, restoration and documentation of CH.Source: Computer graphics forum (Print) 27 (2008): 2178–2187. doi:10.1111/j.1467-8659.2008.01194.x
DOI: 10.1111/j.1467-8659.2008.01194.x
Metrics:
Dellepiane M., Callieri M., Ponchio F., Scopigno R.
The support of advanced information technology (IT) to preservation, restoration and documentation of Cultural Heritage (CH) is becoming a very important goal for the research community. Michelangelo's David was one of the first applications of 3D scanning technology on a highly popular work of art. The subsequent restoration campaign, started in 2002 and concluded in 2004, was also a milestone for the adoption of modern scientific analysis procedures and IT tools in the framework of a restoration process. One of the focuses in this restoration was also methodological, i.e. to plan and adopt innovative ways to document the restoration process. In this paper, we present the results of an integration of different restoration data (2D and 3D datasets) which has been concluded recently. The recent evolution of HW and SW graphics technologies gave us the possibility to interactively visualize an extremely dense 3D model which incorporates the colour information provided by two professional photographic campaigns, made before and after the restoration. Moreover, we present the results concerning the mapping, in this case on the 2D media, of the reliefs produced by restorers to assess and document the status of the marble surface before the restoration took place. This result could lead to new and fascinating applications of computer graphics for preservation, restoration and documentation of CH.Source: Computer graphics forum (Print) 27 (2008): 2178–2187. doi:10.1111/j.1467-8659.2008.01194.x
DOI: 10.1111/j.1467-8659.2008.01194.x
Metrics:
See at:
Computer Graphics Forum | onlinelibrary.wiley.com | CNR ExploRA
2008
Journal article
Restricted
Virtual inspector: a flexible visualizer for dense 3D scanned models
Callieri M., Ponchio F., Cignoni P., Scopigno R.
The rapid evolution of automatic shape acquisition technologies will make huge amount of sampled 3D data available in the near future. Cul- tural Heritage (CH) domain is one of the ideal fields of application of 3D scanned data, while some issues in the use of those data are: how to visualize at interactive rates and full quality on commodity computers; how to improve visualization ease of use; how to support the integrated visualization of a virtual 3D artwork and the multimedia data which tell its story. We present here the Virtual Inspector tool. The system allows naive users to inspect a very dense 3D model at interactive frame rates on off- the-shelf PC's, presenting the 3D model and all the multimedia data that has been linked to selected points of its surface. A main goal in the design of the system was to provide the user with a very easy and natural inter- action approach, based on a straightforward "point and click" metaphor. Visualization efficiency is obtained, without sacrificing quality, by adopt- ing a state-of-the-art continuous level-of-detail (LOD) representation. Fi- nally, the adoption of XML encoding of the GUI structure and behavior, makes Virtual Inspector a very flexible and configurable system.Source: IEEE computer graphics and applications 28 (2008): 44–55. doi:10.1109/MCG.2008.20
DOI: 10.1109/mcg.2008.20
Project(s): EPOCH
Metrics:
Callieri M., Ponchio F., Cignoni P., Scopigno R.
The rapid evolution of automatic shape acquisition technologies will make huge amount of sampled 3D data available in the near future. Cul- tural Heritage (CH) domain is one of the ideal fields of application of 3D scanned data, while some issues in the use of those data are: how to visualize at interactive rates and full quality on commodity computers; how to improve visualization ease of use; how to support the integrated visualization of a virtual 3D artwork and the multimedia data which tell its story. We present here the Virtual Inspector tool. The system allows naive users to inspect a very dense 3D model at interactive frame rates on off- the-shelf PC's, presenting the 3D model and all the multimedia data that has been linked to selected points of its surface. A main goal in the design of the system was to provide the user with a very easy and natural inter- action approach, based on a straightforward "point and click" metaphor. Visualization efficiency is obtained, without sacrificing quality, by adopt- ing a state-of-the-art continuous level-of-detail (LOD) representation. Fi- nally, the adoption of XML encoding of the GUI structure and behavior, makes Virtual Inspector a very flexible and configurable system.Source: IEEE computer graphics and applications 28 (2008): 44–55. doi:10.1109/MCG.2008.20
DOI: 10.1109/mcg.2008.20
Project(s): EPOCH
Metrics:
See at:
IEEE Computer Graphics and Applications | ieeexplore.ieee.org | CNR ExploRA
2009
Journal article
Restricted
Image-to-geometry registration: a mutual information method exploiting illumination-related geometric properties
Corsini M., Dellepiane M., Ponchio F., Scopigno R.
This work concerns a novel study in the field of image-to-geometry registration. Our approach takes inspiration from medical imaging, in particular from multi-modal image registration. Most of the algorithms developed in this domain, where the images to register come from different sensors (CT, X-ray, PET), are based on Mutual Information, a statistical measure of non-linear correlation between two data sources. The main idea is to use mutual information as a similarity measure between the image to be registered and renderings of the model geometry, in order to drive the registration in an iterative optimization framework. We demonstrate that some illuminationrelated geometric properties, such as surface normals, ambient occlusion and reflection directions can be used for this purpose. After a comprehensive analysis of such properties we propose a way to combine these sources of information in order to improve the performance of our automatic registration algorithm. The proposed approach can robustly cover a wide range of real cases and can be easily extended.Source: Computer graphics forum (Print) 28 (2009): 1755–1764. doi:10.1111/j.1467-8659.2009.01552.x
DOI: 10.1111/j.1467-8659.2009.01552.x
Metrics:
Corsini M., Dellepiane M., Ponchio F., Scopigno R.
This work concerns a novel study in the field of image-to-geometry registration. Our approach takes inspiration from medical imaging, in particular from multi-modal image registration. Most of the algorithms developed in this domain, where the images to register come from different sensors (CT, X-ray, PET), are based on Mutual Information, a statistical measure of non-linear correlation between two data sources. The main idea is to use mutual information as a similarity measure between the image to be registered and renderings of the model geometry, in order to drive the registration in an iterative optimization framework. We demonstrate that some illuminationrelated geometric properties, such as surface normals, ambient occlusion and reflection directions can be used for this purpose. After a comprehensive analysis of such properties we propose a way to combine these sources of information in order to improve the performance of our automatic registration algorithm. The proposed approach can robustly cover a wide range of real cases and can be easily extended.Source: Computer graphics forum (Print) 28 (2009): 1755–1764. doi:10.1111/j.1467-8659.2009.01552.x
DOI: 10.1111/j.1467-8659.2009.01552.x
Metrics:
See at:
Computer Graphics Forum | onlinelibrary.wiley.com | CNR ExploRA
2003
Journal article
Unknown
Fast tetrahedron-tetrahedron overlap algorithm
Ganovelli F., Ponchio F., Rocchini C.
We present an algorithm to test two tetrahedra for overlap. The algorithm is based on a dimension reduction technique that allows to apply the Separating Axis Theorem avoiding part of the computation needed to perform the Separating Axis Test. Source code is available online.Source: ACM transactions on intelligent systems and technology (Print) 7 (2003): 17–26.
Ganovelli F., Ponchio F., Rocchini C.
We present an algorithm to test two tetrahedra for overlap. The algorithm is based on a dimension reduction technique that allows to apply the Separating Axis Theorem avoiding part of the computation needed to perform the Separating Axis Test. Source code is available online.Source: ACM transactions on intelligent systems and technology (Print) 7 (2003): 17–26.
See at: CNR ExploRA