1,721,131 research outputs found
The new trend of 3D archaeology is ... going 2D!
No full textNowadays we cannot imagine any archaeological activity – fieldwork, lab work or historical analysis and synthesis – without the support of information technologies. 3D is an important part of this scenario, considering that archaeology is a reality composed of 3D entities that have to be analysed, understood and reconstructed. It comes as no surprise, therefore, that the 3D reconstruction of monuments and sites is one of the most important applications of IT to archaeology, given its ability to recreate, in a perfect and realistic form, something that no longer exists with a strong visual impact. But what if we move our aim from visua- lisation techniques to content? If we focus on communication aspects, we need to consider the fact that 3D may not always be the right solution: if our goal is to make the real meaning of archaeology fully understandable to a wider audience we need something more: we need a story
Il rilievo 3D per l’integrazione dei sistemi informativi di documentazione storica e di restauro della cattedrale di Pisa e della piazza dei Miracoli
No full textSulla base di precedenti sperimentazioni eseguite in piazza dei Miracoli tra il 2002 e il 2003, nel Battistero e nella zona absidale, il progetto è iniziato nel 2005 dal rilievo del volume esterno delle architetture di piazza dei Miracoli al fine di ottenere un innovativo data base integrato. L’utilizzo della tecnologia di scansione laser a tempo di volo per realizzare un modello tridimensionale dell’esterno del Duomo di Pisa tende a sviluppare il collegamento con i Sistemi Informativi relativi alla documentazione storica e di restauro già esistenti o in corso di definizione, in collaborazione con l’ISTI–CNR di Pisa. Il rilievo realizzato del Duomo e della Piazza costituisce dunque la base essenziale di una banca dati di tipo dinamico nella quale inserire le informazioni di tipo storico-culturale, diagnostico e, in generale, sullo stato conservativo attuale e passato del bene. Sono inoltre state eseguite riprese digitali ad alta risoluzione delle zone rilevate al fine di disporre di una rappresentazione tridimensionale misurabile contenente l’informazione quantitativa (geometrica) e quella qualitativa (colore reale degli elementi e dettaglio dell’immagine digitale, nelle zone coperte dal rilievo fotografico). Il rilievo tridimensionale costituisce elemento essenziale per la localizzazione e la mappatura di un bene nonché di ogni elemento e particolare di cui esso è costituito essendo la conoscenza geometrica il fondamento per gli interventi finalizzati alla diagnosi, al monitoraggio e alla tutela. La costruzione di modelli digitali tridimensionali permette quindi una facile integrazione con dati di tipo strutturale ed eventualmente colorimetrico per una completa rappresentazione del bene in oggetto.
The research project related to the 3D survey of the exteriors of the architectures in Piazza dei Miracoli in Pisa to obtain an integrated data base started in 2005 on the basis of previous experimentations realised in 2002 and 2003 on the Baptistery and on the apse. The utilisation of the time-of-flight laser scanner technology to realise a 3D digital model of the exterior of the Cathedral of Pisa followed the purpose to develop an integration of the digital data with the Informative System related to the historical documentation and to restoration projects, extant or in progress in collaboration with the Pisa ISTI-CNR. The 3D survey of the Cathedral and of the Square is the essential base to build up a data base to collect the historical, diagnostic and conservative data. High definition photographic campaign of the surveyed areas has been also realised to obtain a measurable three-dimensional representation completed of the quantitative information (geometric) and qualitative data (real colours of the architectonical elements and details of the digital representation of areas surveyed also by means of the photographic instruments). The 3D survey is the base for the knowledge of the whole cultural heritage and of each detail because the geometric knowledge is the base for monitoring, diagnostic and conservative interventions. The construction of three-dimensional digital models allows an easy data integration (structural and colorimetric data) for a complete representation of the heritage
A dig in archive. The case of Herdonia
No full textSince 2004 the Department of Humanities at the University of Foggia has held the historical archive of Herdonia, contai- ning the documentation of archaeological research carried out in the Roman town of Northern Apulia from 1963 to 2000.
The story hidden in the archive is long and complex, written in the documentation produced during 40 years of excavation and survey that led to the discovery of one of the largest Daunian, Roman and medieval sites in southern Italy. The archive is a unique memory covering a long time-span, containing documents that are parts of the history of archaeological research, linked with various methodologies (from long trenches and Wheeler methodology to big areas) and realized using different techniques and technologies (from paper drawings to CAD models, to 3D scans).
The purpose of activities carried out at the Digital Archaeology Lab is to share all the documents of the Herdonia archive starting from spatial data, carrying out specific workflows for building a common environment in which the digitized legacy data and digital born data can stay together.
The first phase of the project has been thus the recovering all the hand-drawn maps, their digitizing and georeferencing in an open source GIS. For the first time all of the sectors and trenches dug up on the site of Herdonia stay together, georeferenced, under the same roof
Multiresolution Decimation based on Global Error
No full textDue to the surface meshes produced at increasing complexity in many applications, interest in efficient simplification algorithms and multiresolution representation is very high. An enhanced simplification approach together with a general multiresolution data scheme are presented here. JADE, a new simplification solution based on the Mesh Decimation approach has been designed to provide both increased approximation precision, based on global error management, and multiresolution output. Moreover, we show that with a small increase in memory, which is needed to store the multiresolution data representation, we are able to extract any level of detail representation from the simplification results in an extremely efficient way. Results are reported on empirical time complexity, approximation quality, and simplification power. Keywords: surface modeling, mesh simplification, bounded approximation error, multiresolution. Address to which proofs should be sent: R. SCOPIGNO, CNUCE -- Consigl..
La Cattedrale di Pisa nella Piazza dei Miracoli
No full textSulla base di precedenti sperimentazioni eseguite in piazza dei Miracoli tra il 2002 e il 2003, nel Battistero e nella zona absidale, il progetto è iniziato nel 2005 dal rilievo del volume esterno delle architetture di piazza dei Miracoli al fine di ottenere un innovativo data base integrato. L’utilizzo della tecnologia di scansione laser a tempo di volo per realizzare un modello tridimensionale dell’esterno del Duomo di Pisa tende a sviluppare il collegamento con i Sistemi Informativi relativi alla documentazione storica e di restauro già esistenti o in corso di definizione, in collaborazione con l’ISTI–CNR di Pisa. Il rilievo realizzato del Duomo e della Piazza costituisce la base essenziale di una banca dati di tipo dinamico nella quale inserire le informazioni di tipo storico-culturale, diagnostico e, in generale, sullo stato conservativo attuale e passato del bene. Il rilievo tridimensionale costituisce elemento essenziale per la localizzazione e la mappatura di un bene nonché di ogni elemento e particolare di cui esso è costituito essendo la conoscenza geometrica il fondamento per gli interventi finalizzati alla diagnosi, al monitoraggio e alla tutela. La costruzione di modelli digitali tridimensionali permette quindi una facile integrazione con dati di tipo strutturale ed eventualmente colorimetrico per una completa rappresentazione del bene in oggetto
Efficient Support for Video Communications in Wireless Home Networks
Full text linkThis paper investigates the performance of video communications over wireless networks employing the recently proposed Time-Division Unbalanced Carrier Sense Multiple access (TDuCSMA) coordination function. TDuCSMA is fully IEEE 802.11 standard compliant but offers novel bandwidth management capabilities. In this work the peculiar characteristics of TDuCSMA are configured and exploited to maximize the performance of video communications in a realistic home networking scenario. Simulation results show significant performance improvements with respect to legacy IEEE 802.11 network. The video quality gains are up to 13 dB PSNR with 500 ms playout buffer, while the average delay of the video packets is much lower, for the same amount of video traffic offered to the network. These results significantly contribute to enhance the quality of experience of the users of the video communicatio
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
- …
