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2021 Contribution to book Restricted

Virtual clones for cultural heritage applications
Potenziani M., Banterle F., Callieri M., Dellepiane M., Ponchio F., Scopigno R.
Digital technologies are now mature for producing high quality digital replicas of Cultural Heritage (CH) artifacts. The research results produced in the last decade have shown an impressive evolution and consolidation of the technologies for acquiring high-quality digital 3D models, encompassing both geometry and color (or, better, surface reflectance properties). Some recent technologies for constructing 3D models enriched by a high-quality encoding of the color attribute will be presented. The focus of this paper is to show and discuss practical solutions, which could be deployed without requiring the installation of a specific or sophisticated acquisition lab setup. In the second part of this paper, we focus on new solutions for the interactive visualization of complex models, adequate for modern communication channels such as the web and the mobile platforms. Together with the algorithms and approaches, we show also some practical examples where high-quality 3D models have been used in CH research, restoration and conservation.Source: From Pen to Pixel - Studies of the Roman Forum and the Digital Future of World Heritage, edited by Fortini Patrizia, Krusche Krupali, pp. 225–233. Roma: L'Erma di Bretschneider, 2021

See at: CNR ExploRA Restricted | www.lerma.it Restricted

2021 Journal article Open Access OPEN

Sharing archaeological knowledge: the interactive reporting system
Derudas P., Dell'Unto N., Callieri M., Apel J.
This study describes the development of a digital reporting system designed to provide archaeologists with a dynamic and interactive 3D web platform that can be used for describing in great detail records and activities undertaken across a multi-year field investigation campaign. The system was used to compose the archaeological report of a multi-year investigation and employed during the pandemic crisis for supporting digital courses in archaeological practice; the paper also reports the preliminary results of the use of this platform within teaching activities. Unlike other web solutions, this system supports an assisted publication of archaeological contents that integrates a 3D visualization system in the reporting process, exploiting the communicative potentials of 3D models and the web. This study represents a contribution to research on sustainable forms of management and publication of archaeological contents and their reuse and sharing.Source: Journal of field archaeology (2021). doi:10.1080/00934690.2021.1911132
DOI: 10.1080/00934690.2021.1911132

See at: ISTI Repository Open Access | CNR ExploRA Open Access | www.tandfonline.com Open Access | Journal of Field Archaeology Restricted

2021 Journal article Open Access OPEN

Dynamic collections: a 3D web infrastructure for artifact engagement
Ekengren F., Callieri M., Dininno D., Berggren A., Macheridis S., Dell'Unto N.
Archaeological collections are crucial in heritage studies and are used every day for training archaeologists and cultural heritage specialists. The recent developments in 3D acquisition and visualization technology has contributed to the rapid emergence of a large number of 3D collections, whose production is often justified as the democratization of data and knowledge production. Despite the fact that several 3D datasets are now available online, it is not always clear how the data - once stored - may be engaged by archaeology students, and the possible challenges the students may face in the learning process. The goal of the Dynamic Collections project at Lund University is to develop a novel 3D web infrastructure designed to support higher education and research in archaeology. At the onset of the COVID-19 pandemic in the spring of 2020, all teaching at Lund University moved online, reinforcing the urgency for such an infrastructure. By letting a group of students test an early version of the system as part of their online teaching, we were able to study how they used and interacted with an archaeological collection in 3D and explore the intersection of digital methods and pedagogy in archaeology. This article presents the preliminary results from this experiment.Source: open archaeology 7 (2021): 337–352. doi:10.1515/opar-2020-0139
DOI: 10.1515/opar-2020-0139

See at: ISTI Repository Open Access | CNR ExploRA Open Access | www.degruyter.com Open Access

2020 Journal article Open Access OPEN

Effective annotations over 3D models
Ponchio F., Callieri M., Dellepiane M., Scopigno R.
Annotation support in interactive systems is often considered a simple task by the CG community, since it entails the apparently easy selection of a region and its connection with some information. The reality appears more complex. The scope of this paper is twofold: first, to review the status of this domain, discussing and characterizing several approaches proposed in literature to manage annotations over geometric models; second, to present in detail an innovative solution proposed and assessed in the framework of Cultural Heritage (CH) applications, called ClippingVolumes. At the annotation definition stage ClippingVolumes uses 3D data to characterize the annotation region; subsequently, annotations are visualized by adopting a two-pass rendering solution which uses stencil buffers, thus without introducing new geometric elements, changing the topology or duplicating geometry elements. It solves most of the issues that afflict the current state of the art, such as fragmentation, annotation transfer to multiple representations, and multi-resolution data encoding. The latter is a mandatory requirement to produce efficient web-based systems. We implemented and we fully tested this approach in the framework of a complex system that supports the documentation of CH restoration projects.Source: Computer graphics forum (Online) 39 (2020): 89–105. doi:10.1111/cgf.13664
DOI: 10.1111/cgf.13664

See at: ISTI Repository Open Access | Computer Graphics Forum Restricted | Computer Graphics Forum Restricted | Computer Graphics Forum Restricted | Computer Graphics Forum Restricted | onlinelibrary.wiley.com Restricted | Computer Graphics Forum Restricted | CNR ExploRA Restricted

2020 Journal article Open Access OPEN

Optimizing object decomposition to reduce visual artifacts in 3D printing
Filoscia I., Alderighi T., Giorgi D., Malomo L., Callieri M., Cignoni P.
We propose a method for the automatic segmentation of 3D objects into parts which can be individually 3D printed and then reassembled by preserving the visual quality of the final object. Our technique focuses on minimizing the surface affected by supports, decomposing the object into multiple parts whose printing orientation is automatically chosen. The segmentation reduces the visual impact on the fabricated model producing non-planar cuts that adapt to the object shape. This is performed by solving an optimization problem that balances the effects of supports and cuts, while trying to place both in occluded regions of the object surface. To assess the practical impact of the solution, we show a number of segmented, 3D printed and reassembled objects.Source: Computer graphics forum (Print) 39 (2020): 423–434. doi:10.1111/cgf.13941
DOI: 10.1111/cgf.13941
Project(s): EVOCATION via OpenAIRE

See at: onlinelibrary.wiley.com Open Access | ISTI Repository Open Access | CNR ExploRA Open Access | Computer Graphics Forum Restricted | Computer Graphics Forum Restricted | Computer Graphics Forum Restricted | Computer Graphics Forum Restricted | Computer Graphics Forum Restricted | Computer Graphics Forum Restricted | Computer Graphics Forum Restricted | Computer Graphics Forum Restricted

2020 Journal article Open Access OPEN

On improving the training of models for the semantic segmentation of benthic communities from orthographic imagery
Pavoni G., Corsini M., Callieri M., Fiameni G., Edwards C., Cignoni P.
The semantic segmentation of underwater imagery is an important step in the ecological analysis of coral habitats. To date, scientists produce fine-scale area annotations manually, an exceptionally time-consuming task that could be efficiently automatized by modern CNNs. This paper extends our previous work presented at the 3DUW'19 conference, outlining the workflow for the automated annotation of imagery from the first step of dataset preparation, to the last step of prediction reassembly. In particular, we propose an ecologically inspired strategy for an efficient dataset partition, an over-sampling methodology targeted on ortho-imagery, and a score fusion strategy. We also investigate the use of different loss functions in the optimization of a Deeplab V3+ model, to mitigate the class-imbalance problem and improve prediction accuracy on coral instance boundaries. The experimental results demonstrate the effectiveness of the ecologically inspired split in improving model performance, and quantify the advantages and limitations of the proposed over-sampling strategy. The extensive comparison of the loss functions gives numerous insights on the segmentation task; the Focal Tversky, typically used in the context of medical imaging (but not in remote sensing), results in the most convenient choice. By improving the accuracy of automated ortho image processing, the results presented here promise to meet the fundamental challenge of increasing the spatial and temporal scale of coral reef research, allowing researchers greater predictive ability to better manage coral reef resilience in the context of a changing environment.Source: Remote sensing (Basel) 12 (2020). doi:10.3390/RS12183106
DOI: 10.3390/rs12183106

See at: Remote Sensing Open Access | Remote Sensing Open Access | ISTI Repository Open Access | CNR ExploRA Open Access | Remote Sensing Open Access | Remote Sensing Open Access

2020 Conference article Open Access OPEN

Another Brick in the Wall: Improving the Assisted Semantic Segmentation of Masonry Walls
Pavoni G., Giuliani F., De Falco A., Corsini M., Ponchio F., Callieri M., Cignoni P.
In Architectural Heritage, the masonry's interpretation is an essential instrument for analyzing the construction phases, the assessment of structural properties, and the monitoring of its state of conservation. This work is generally carried out by specialists that, based on visual observation and their knowledge, manually annotate ortho-images of the masonry generated by photogrammetric surveys. This results in vectorial thematic maps segmented according to their construction technique (isolating areas of homogeneous materials/structure/texture) or state of conservation, including degradation areas and damaged parts. This time-consuming manual work, often done with tools that have not been designed for this purpose, represents a bottleneck in the documentation and management workflow and is a severely limiting factor in monitoring large-scale monuments (e.g.city walls). This paper explores the potential of AI-based solutions to improve the efficiency of masonry annotation in Architectural Heritage. This experimentation aims at providing interactive tools that support and empower the current workflow, benefiting from specialists' expertise.Source: 18th Eurographics Workshop on Graphics and Cultural Heritage, pp. 43–51, Online event, 18-19/11/2020
DOI: 10.2312/gch.20201291

See at: ISTI Repository Open Access | CNR ExploRA Open Access

2019 Journal article Open Access OPEN

Developing the ArchAIDE application: A digital workflow for identifying, organising and sharing archaeological pottery using automated image recognition
Anichini F., Banterle F., Buxeda I Garrigós J., Calleri M., Dershowitz N., Diaz D. L., Evans T., Gattiglia G., Gualandi M. L., Hervas M. A., Itkin B., Madrid I Fernandez M, Miguel Gascón E., Remmy M., Richards J., Scopigno R., Vila L., Wolf L., Wright H., Zallocco M.
Every day, archaeologists are working to discover and tell stories using objects from the past, investing considerable time, effort and funding to identify and characterise individual finds. Pottery is of fundamental importance for the comprehension and dating of archaeological contexts, and for understanding the dynamics of production, trade flows, and social interactions. Today, characterisation and classification of ceramics are carried out manually, through the expertise of specialists and the use of analogue catalogues held in archives and libraries. While not seeking to replace the knowledge and expertise of specialists, the ArchAIDE project (archaide.eu) worked to optimise and economise identification process, developing a new system that streamlines the practice of pottery recognition in archaeology, using the latest automatic image recognition technology. At the same time, ArchAIDE worked to ensure archaeologists remained at the heart of the decision-making process within the identification workflow, and focussed on optimising tasks that were repetitive and time consuming. Specifically, ArchAIDE worked to support the essential classification and interpretation work of archaeologists (during both fieldwork and post-excavation analysis) with an innovative app for tablets and smartphones. This paper summarises the work of this three-year project, funded by the European Union's Horizon 2020 Research and Innovation Programme under grant agreement N.693548, with a consortium of partners which has representing both the academic and industry-led ICT domains, and the academic and development-led archaeology domains. The collaborative work of the archaeological and technical partners created a pipeline where potsherds are photographed, their characteristics compared against a trained neural network, and the results returned with suggested matches from a comparative collection with typical pottery types and characteristics. Once the correct type is identified, all relevant information for that type is linked to the new sherd and stored within a database that can be shared online.Source: Internet archaeology 52 (2019). doi:10.11141/ia.52.7
DOI: 10.11141/ia.52.7
Project(s): ArchAIDE via OpenAIRE

See at: Internet Archaeology Open Access | Internet Archaeology Open Access | Internet Archaeology Open Access | Internet Archaeology Open Access | ISTI Repository Open Access | CNR ExploRA Open Access

2019 Conference article Open Access OPEN

Visual acquisition system for georeferenced monitoring and reconstruction of the sea bottom using audio for data synchronisation
Costanzi R., Gasparri A., Pacienza F., Pollini L., Caiti A., Manzari V., Terracciano D., Stifani M., Pavoni G., Callieri M., Barbieri C., Colonna F., Gaino F., Moretto P., Pepe C. E., Romanelli A.
This work describes a Smart Dive Scooter (SDS) to be used as a support tool for monitoring application of different marine species. Professional divers of Environmental Protection Agencies are periodically involved in monitoring activities. Ligurian Regional Agency for the Environmental Protection (ARPAL) and the University of Pisa (UNIPI) are collaborating towards the integration of classical methodologies with ICT tools to support the work of divers in terms of safety, cost effectiveness and time effectiveness. The SDS is the first step in this direction. It is a classical Dive Scooter, used for rapid movements underwater, that is integrated with sensors for environment monitoring (a set of cameras) and for data georeferencing (acoustic localisation system). The SDS will be used by ARPAL divers to quickly acquire images of the bottom of a target area. Processing of optical and positioning data will allow to build a virtual model on which perform all the analysis and measurement activities. This approach results in limiting the time underwater for operators increasing the area mapper per each dive. The paper focuses on the technique used for the synchronization of optical data among the various cameras and of them with the acoustic position measurements. This goal is obtained exploiting the audio tracks acquired by the cameras avoiding the necessity of bulky and energy expensive dedicated computers. Results of the validation based on experimental data collected at sea are reported.Source: OCEANS 2019, Marseille, 17-20/6/2019
DOI: 10.1109/oceanse.2019.8867123

See at: ISTI Repository Open Access | academic.microsoft.com Restricted | ieeexplore.ieee.org Restricted | ieeexplore.ieee.org Restricted | CNR ExploRA Restricted | xplorestaging.ieee.org Restricted

2019 Journal article Open Access OPEN

Semantic segmentation of Benthic communities from ortho-mosaic maps
Pavoni G., Corsini M., Callieri M., Palma M., Scopigno R.
Visual sampling techniques represent a valuable resource for a rapid, non-invasive data acquisition for underwater monitoring purposes. Long-term monitoring projects usually requires the collection of large quantities of data, and the visual analysis of a human expert operator remains, in this context, a very time consuming task. It has been estimated that only the 1-2% of the acquired images are later analyzed by scientists (Beijbom et al., 2012). Strategies for the automatic recognition of benthic communities are required to effectively exploit all the information contained in visual data. Supervised learning methods, the most promising classification techniques in this field, are commonly affected by two recurring issues: the wide diversity of marine organism, and the small amount of labeled data. In this work, we discuss the advantages offered by the use of annotated high resolution ortho-mosaics of seabed to classify and segment the investigated specimens, and we suggest several strategies to obtain a considerable per-pixel classification performance although the use of a reduced training dataset composed by a single ortho-mosaic. The proposed methodology can be applied to a large number of different species, making the procedure of marine organism identification an highly adaptable task.Source: ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences (ISPRS Annals) 42 (2019): 151–158. doi:10.5194/isprs-archives-XLII-2-W10-151-2019
DOI: 10.5194/isprs-archives-xlii-2-w10-151-2019
Project(s): GreenBubbles via OpenAIRE

See at: The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences Open Access | The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences Open Access | ISTI Repository Open Access | CNR ExploRA Open Access | The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences Open Access | ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences Open Access | The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences Open Access | www.int-arch-photogramm-remote-sens-spatial-inf-sci.net Open Access

2019 Contribution to book Unknown

Come funziona una stampante 3D?
Callieri M., Taddia F.
Trascrizione della intervista radiofonica della trasmissione "terra in vista", dove si spiega la tecnologia ai ragazzi. L'argomento del capitolo sono le stampanti 3D. Il testo è stato elaborato come serie di domande-risposte.Source: Terra in vista, edited by Telmo Pievani, Federico Taddia, pp. 135–140. Milano: Mondadori, 2019

See at: CNR ExploRA | www.ragazzimondadori.it

2019 Other Unknown

Three Armenian Manuscripts from Tuscany
Callieri M., Pingi P., Potenziani M., Ponchio F., Scopigno R.
For the temporary exhibition "Three Armenian Manuscripts from Tuscany", taking palce at the Matenadaran Museum (Jerevan, Armenia) from June 9th 2019 to January 9 2020, The Visual Computing Lab of ISTI-CNR created a multimedia interactive kiosk presenting to the museum visitors the pages of the codices and the rooms of the libraries that preserved the books in their long life. The photographic campaign of the codices and buildings has also been used in the monographic volume "Three Armenian Manuscripts from Tuscany (13th - 14th century)", by Anna Rita Fantoni e Giovanna Rasario. Mandragora, Firenze. 2019. ISBN 978-88-7461-475-2 The Kiosk presents, commented by the texts edited by the experts Anna Rita Fantoni e Giovanna Rasario, high-res 360° panorama images of ther libraries (Biblioteca Medicea Laurenziana and Biblioteca di S. Matteo), high-res images of selected pages of the three codices displayed int he exhibition, and relightable RTI images of the decorated cover of one of the codices and of a parchment page illuminated in gold. The Kiosk is based on web technologies: this makes possible the installation on a stand-alone PC (like in the exhibition) but also a web publishing, linked just above. The generation of RTI, and the web visualization of RTI and multiresolution images is managed by the library Relight, developed by ISTI-CNR.

See at: CNR ExploRA | vcg.isti.cnr.it

2019 Contribution to book Closed Access

Rilievo 3D di Alchimia, ed uso dei modelli 3D per studio e divulgazione
Callieri M., Dellepiane M., Lureau A., Pavoni G., Pingi P., Potenziani M., Scopigno R.
Le tecniche di digitalizzazione 3D si sono fatte largo prepotentemente nel campo dei beni culturali. Dalle prime sperimentazioni dell'utilizzo di modelli 3D di due decenni fa, si è arrivati oggi ad una ampia diffusione e democratizzazione di queste tecnologie, fino a poter dire che la digitalizzazione 3D è uno strumento ormai essenziale nella maggior parte dei progetti di conservazione, restauro, documentazione e studio dei beni culturali. Nell'ultimo periodo, poi, anche le tecnologie di riproduzione fisica da modelli 3D (3D printing e la prototipazione rapida) stanno entrando nella routine di queste tipologie di azione. Un aspetto chiave dei modelli digitali 3D risiede nella loro "doppia natura": -i modelli 3D sono pura informazione numerica e geometrica, sono fatti, cioè, di numeri che rappresentano le misure e la forma di un oggetto fisico. Hanno dunque proprietà metriche, e le misure in essi contenute possono essere usate per calcoli tecnici, documentazione, simulazione e riproduzione fisica; -i modelli 3D però hanno anche un aspetto "visuale", cioè possono essere visualizzati e disegnati a schermo formando immagini che, visivamente, corrispondono alla percezione che noi avremmo davanti all'oggetto reale (specialmente quando il modello 3D geometrico è corredato anche di informazione di tessitura o colore). Questa doppia natura unisce una precisione, una scientificità del dato, alla possibilità di interagire con esso in maniera naturale, come faremmo con l'oggetto reale. Se è vero che nelle prime sperimentazioni, i modelli 3D sono stati utilizzati solamente come fonte di misure e di dati, oppure solo come "gadget visuale" per presentare al pubblico l'oggetto d'arte, possiamo dire che oggi, con il progredire delle tecnologie, e soprattutto con la definizione di protocolli di lavoro più completi, questi due aspetti riescono ad essere sfruttati appieno in maniera congiunta. In questo lavoro, per l'appunto, è stato possibile sfruttare appieno le potenzialità del media digitale 3D, sia dal punto di vista scientifico-documentale, che come strumento di disseminazione e di coinvolgimento del pubblico.Source: Alchimia di Jackson Pollock - Viaggio all'interno della materia, edited by Luciano Pensabene Buemi, Francesca Bettini, Roberto Bellucci, pp. 145–154. Firenze: Edifir - Edizioni Firenze s.r.l., 2019

See at: CNR ExploRA Restricted

2019 Journal article Open Access OPEN

3D archaeological data management via web: The experience with 3DHOP software
Vecchione A., Lureau A., Callieri M.
3D Heritage Online Presenter (3DHOP) is a framework for advanced web-based visual presentations of high-resolution 3D content. Developed at the Visual Computing Lab CNR ISTI, 3DHOP was designed to cope with the specific needs of cultural heritage projects, supporting web-based publishing of very high-resolution digitized results and enabling the documentation of complex restoration actions. The present paper highlights, through some case studies (Peltuinum archaeological area, AQ, and Castillo de La Muela in Consuegra), the potentials of 3DHOP's tools for the management of data from both active (laser scanner) and passive sensors (photogrammetry and aerophotogrammetry). In addition, problems and solutions encountered during the organization and personalization of web pages will be presented. The goal of this operation is to create a three-dimensional hub that can collect and link traditional archaeological documentation to 3D geometry.Source: Archeologia e calcolatori 30 (2019): 483–486. doi:10.19282/ac.30.2019.35
DOI: 10.19282/ac.30.2019.35

See at: ISTI Repository Open Access | CNR ExploRA Open Access | www.archcalc.cnr.it Open Access

2018 Journal article Open Access OPEN

A 3D-centered information system for the documentation of a complex restoration intervention
Apollonio F. I., Basilissi V., Callieri M., Dellepiane M., Gaiani M., Ponchio F., Rizzo F., Rubino A. R., Scopigno R., Sobrà G.
Restoration is becoming a quite complex process: a large number of internal and external variables co-exist and may impair it. Among these, the large number of professionals involved and the huge amount of documentation produced can heavily affect the quality of the intervention as well as the possibility to have systemic and informed interventions in the future. In particular, a standardized method for storing restoration data and accessing them is still lacking, and the use of new technologies is still limited and/or not scalable. The paper describes the process of designing and testing an information system (IS) based on three-dimensional (3D) data, aimed to support the restoration of Neptune's Fountain in Bologna. In preparation of the restoration, a major effort was carried out to design and implement a web-based IS able to host all of the data produced, to allow the conservation-restoration specialists to interact on-site with an accurate 3D representation of the elements of the fountain, and to directly reference all information and data produced on the geometry of the model. The paper focuses on the challenges and adopted solutions related to the use of 3D models and the data mapping on 3D surfaces in the context of restoration documentation. Highly detailed visualizations of the models, easy navigation, and usable functionalities to add information directly on the 3D model have been achieved by extending the available solutions and by implementing new mechanisms to overcome the limitations of WebGL and remote rendering. Neptune IS' development has been extensively experimented in a real context of use. Results and knowledge from the experimentation currently represents the basis for evolving Neptune IS into a possible generic and flexible platform for documentation management in the field of restoration and related methodologies.Source: Journal of cultural heritage 29 (2018): 89–99. doi:10.1016/j.culher.2017.07.010
DOI: 10.1016/j.culher.2017.07.010

See at: RE.PUBLIC@POLIMI Research Publications at Politecnico di Milano Open Access | ISTI Repository Open Access | Journal of Cultural Heritage Restricted | Journal of Cultural Heritage Restricted | Journal of Cultural Heritage Restricted | Journal of Cultural Heritage Restricted | Journal of Cultural Heritage Restricted | Archivio istituzionale della ricerca - Alma Mater Studiorum Università di Bologna Restricted | CNR ExploRA Restricted | Journal of Cultural Heritage Restricted | www.sciencedirect.com Restricted

2018 Contribution to book Open Access OPEN

Using digital 3D technology for documenting and studying the Griffin
Callieri M., Scopigno R., Dellepiane M.
The digitization of the Griffin aimed at producing a very high-resolution and accurate sampling of its shape and of its surface decoration and colour, thus touching the spheres of both the 2D and 3D representation. The Griffin is a remarkable object that imposed a number of constraints in the planning and implementation of its digitization. The constraints were both in the complex shape of the Griffin (since the representation of the overall shape should be paired by an accurate sampling of the very thin decorations carved on the surface of the statue) and the dark and often reflective bronze surface.Source: The Pisa Griffin and the Mari-Cha Lion. Metalwork, Art, and Technology in the Medieval Islamicate Mediterranean, edited by Anna Contadini, pp. 145–157, 2018

See at: ISTI Repository Open Access | CNR ExploRA Open Access | www.pacinieditore.it Open Access

2018 Conference article Open Access OPEN

Developing and maintaining a web 3D viewer for the CH community: an evaluation of the 3DHOP framework
Potenziani M., Callieri M., Scopigno R.
3DHOP (3D Heritage On-line Presenter) has been released 4 years ago, as an open-source framework for the creation of interactive visualization of 3D content on the web, aimed at the CH field. Transforming a research tool into a software "product" usable by the heterogeneous CH community is not a simple task and requires a significant amount of resources plus a specific design. This work presents the evolution of the 3DHOP system, and the complex relationship with its community of users, made of content creators, CH experts and general public. We will discuss the new features introduced, as well as the design and implementation strategy employed to maintain the software and make it usable by developers. We will evaluate the effectiveness of the platform by illustrating some of the applications built with 3DHOP either internally or by external users, as well as by presenting the results of a survey aimed at gathering the opinions and suggestions of the user community.Source: 16th Eurographics Workshop on Graphics and Cultural Heritage, Vien, Austria, 12-15 November 2018

See at: ISTI Repository Open Access | CNR ExploRA Open Access | www.chnt.at Open Access

2018 Journal article Open Access OPEN

Quasi-orthorectified projection for the measurement of red gorgonian colonies
Pavoni G., Palma M., Callieri M., Dellepiane M., Cerrano C., Pantaleo U., Scopigno R.
This study presents a practical method to estimate dimensions of Paramuricea clavata colonies using generic photographic datasets collected across wide areas. Paramuricea clavata is a non-rigid, tree-like octocoral; this morphology greatly affects the quality of the sea fans multi-view stereo matching reconstruction, resulting in hazy and incoherent clouds, full of "false" points with random orientation. Therefore, the standard procedure to take measurements over a reconstructed textured surface in 3D space is impractical. Our method overcomes this problem by using quasi-orthorectified images, produced by projecting registered photos on the plane that best fits the point cloud of the colony. The assessments of the measures collected have been performed comparing ground truth data set and time series images of the same set of colonies. The measurement errors fall below the requirements for this type of ecological observations. Compared to previous works, the presented method does not require a detailed reconstruction of individual colonies, but relies on a global multi-view stereo reconstruction performed through a comprehensive photographic coverage of the area of interest, using a low-cost pre-calibrated camera. This approach drastically reduces the time spent working on the field, helping practitioners and scientists in improving efficiency and accuracy in their monitoring plans.Source: The international archives of the photogrammetry, remote sensing and spatial information sciences (Print) 42 (2018): 853–860. doi:10.5194/isprs-archives-XLII-2-853-2018
DOI: 10.5194/isprs-archives-xlii-2-853-2018

See at: The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences Open Access | The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences Open Access | ISTI Repository Open Access | CNR ExploRA Open Access | The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences Open Access | The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences Open Access | The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences Open Access

2018 Journal article Open Access OPEN

Publishing and consuming 3D content on the Web. A survey
Potenziani M., Callieri M., Dellepiane M., Scopigno R.
Three-dimensional content is becoming an important component of the World Wide Web environment. From the advent of WebGL to the present, a wide number of solutions have been developed (including libraries, middleware, and applications), encouraging the establishment of 3D data as online media of practical use. The fast development of 3D technologies and related web-based resources makes it difficult to identify and properly understand the current trends and open issues. Starting from these premises, this survey analyzes the state of the art of 3D web publishing, reviews the possibilities provided by the major current approaches, proposes a categorization of the features supported by existing solutions, and cross-maps these with the requirements of a few main application domains. The results of this analysis should help in defining the technical characteristics needed to build efficient and effective 3D data presentation, taking into account the application contexts.Source: Foundations and trends in computer graphics and vision 10 (2018): 244–333. doi:10.1561/0600000083
DOI: 10.1561/0600000083

See at: ISTI Repository Open Access | Foundations and Trends® in Computer Graphics and Vision Open Access | CNR ExploRA Restricted | www.nowpublishers.com Restricted

2018 Conference article Open Access OPEN

A 3D digital approach for the study and presentation of the Bisarcio site
Derudas P., Sgarella M. C., Callieri M.
Recently, 3D-from-photos and close-range photogrammetry have established themselves as important modern technologies in archaeology. Nevertheless, three-dimensional survey has not reached its full potential in the daily work of excavation, as it has been generally restricted to exceptional and monumental cases. The digging of the late- and post-medieval cemetery of Bisarcio, Sardinia, was an opportunity to experiment with 3D survey. After an extensive 3D survey, covering the entire excavation area and duration, 3D models have been used for the documentation and interpretation of the stratigraphy, and, to create a web-based visualization and dissemination tool. The three interconnected steps, of documentation, interpretation, and visualization and dissemination, were used to evaluate the effectiveness of the 3D data in each step, and also to build a complete 3D workflow. The results are promising: with the correct protocol, these procedures may be soon part of the archaeologist's daily routines.Source: CAA2016 44th Conference on Computer Applications and Quantitative Methods in Archaeology., pp. 389–398, Oslo, 30 marzo - 3 aprile 2016

See at: archaeopress.com Open Access | ISTI Repository Open Access | CNR ExploRA Open Access