1,720,969 research outputs found
Micro UAV photogrammetry: a new procedure for the survey of archeological sites
No full textThe project described here intends to deal with and analyse the development and potentialities of micro
UAVs (micro Unmanned Aerial Vehicles). In particular, it will focus on the interaction between these
vehicles and new multi-image software products, considering the consequences that this system provoked on
themethodologyoftraditionalphotogrammetryappliedinthearchaeologicalfield.
The purpose of this work is the individuation of the potentialities in the working approach on one side of the
UAVsas a mean to acquire metrical information and on the other side of multi-image software products for
theprocessingoftheacquired data.Inotherterms,different techniques arecompared andintegrated, inorder
tounderstandthepossibilitiesofthisnewmethodology.
Finally, the system proposed here has great advantages in terms of versatility, manoeuvrability and costs.
Moreover, it is easy to use and produces good results that are interesting as both research and documentation
toolsduetotheirrichnessofinformation.
In the archaeological field, this system shows its strength as a method to acquire not just metrical data, but
also high-resolution images, combining the accuracy on the data acquired, to the potentials of aerial images,
usefulforinterpretationanddocumentationpurposes
The Tribuna of Palazzo Grimani: a 3D survey and virtual representation of the original statuary
No full textAutomatic Systems for Digitizing Historical Maps
Get PDFThis work is part of a research branch that studies how to acquire metric, semantic and symbolic information from historical maps without damaging the physical support. The technological growth regarding both mechanical instruments and digital high-resolution sensors allowed the development of suitable tools for the digitization of historical maps and creation of more accurate digital models; therefore, by now, the use of automatic systems for acquisition of digital data is continuously spreading.
In the work described in this paper we used a robotic arm (UR10), on which we mounted a digital camera in order to acquire high-resolution images of any object following a regular grid. The arm movement was programmed to keep the rotation angles of the camera constant while shifting it at pre-defined quantities along the two axes. The tests performed demonstrated that we could obtain a three-dimensional model with an accuracy below the millimetre in an almost automatic way
An application of integrated 3D technologies for replicas in cultural heritage
Get PDFIn recent decades, 3D acquisition by laser scanning or digital photogrammetry has become one of the standard methods of documenting cultural heritage, because it permits one to analyze the shape, geometry, and location of any artefact without necessarily coming into contact with it. The recording of three-dimensional metrical data of an asset allows one to preserve and monitor, but also to understand and explain the history and cultural heritage shared. In essence, it constitutes a digital archive of the state of an artefact, which can be used for various purposes, be remodeled, or kept safely stored. With the introduction of 3D printing, digital data can once again take on material form and become physical objects from the corresponding mathematical models in a relatively short time and often at low cost. This possibility has led to a different consideration of the concept of virtual data, no longer necessarily linked to simple visual fruition. The importance of creating high-resolution physical copies has been reassessed in light of different types of events that increasingly threaten the protection of cultural heritage. The aim of this research is to analyze the critical issues in the production process of the replicas, focusing on potential problems in data acquisition and processing and on the accuracy of the resulting 3D printing. The metric precision of the printed model with 3D technology are fundamental for everything concerning geomatics and must be related to the same characteristics of the digital model obtained through the survey analysi
Digitization of maps belonging to cultural heritage
No full textmaps are an essential documentary heritage for the knowledge of ter-ritory. Digitization, in the case of old maps, cannot be a simple high-resolution two-dimensional scan, but it has to detect the geometry of the supporting material. This work describes part of an on-going project, developed by the Laboratory of Photo-grammetry of IUAV University, concerning the study of different methodologies and tools for the 3D digitization of old maps. In particular, high-resolution cameras, combined with a mechanical positioning system and appropriate software for the rigorous construction of “mosaics”, will be explored as a potential means of replacing the expensive large format flatbed scanners. The research aims to digitally record the shape of maps, not only consid-ering their semantic content (printed image), but also their three-dimensional surfaces, and their subjection to time and deformations. Through the development of new algorithms, procedures and mechanical properties, it will be possible to obtain a rigorous three-dimensional geometric memory of the original cartographic heritage
Il rilievo del sito di Terravecchia di Sepino: integrazione laser scanner e fotogrammetria da drone
No full textAction cameras and low-cost aerial vehicles in archaeology
No full textThis research is focussed on the analysis of the potential of a close range aerial photogrammetry system, which is accessible both in economic terms and in terms of simplicity of use. In particular the Go Pro Hero3 Black Edition and the Parrot Ar. Drone 2.0 were studied. There are essentially two limitations to the system and they were found for both the instruments used. Indeed, the frames captured by the Go Pro are subject to great distortion and consequently pose numerous calibration problems. On the other hand, the limitation of the system lies in the difficulty of maintaining a flight configuration suitable for photogrammetric purposes in unfavourable environmental conditions. The aim of this research is to analyse how far the limitations highlighted can influence the precision of the survey and consequent quality of the results obtained. To this end, the integrated GoPro and Parrot system was used during a survey campaign on the Altilia archaeological site, in Molise. The data obtained was compared with that gathered by more traditional methods, such as the laser scanner. The system was employed in the field of archaeology because here the question of cost often has a considerable importance and the metric aspect is frequently subordinate to the qualitative and interpretative aspects. Herein one of the products of these systems; the orthophoto will be analysed, which is particularly useful in archaeology, especially in situations such as this dig in which there aren’t many structures in elevation present. The system proposed has proven to be an accessible solution for producing an aerial documentation, which adds the excellent quality of the result to metric data for which the precision is known
3D printing : state of the art and future perspectives
No full textIn the last years, the development of 3D technologies applied to the field of Cultural Heritage (CH) has led to results of the utmost importance from the point of view of preservation, valorisation, communication and fruition of our assets. In particular, we experienced many interdisciplinary projects in which, thanks to the cooperation of different fields of research, incredible results have been obtained, through the technological collaboration of computer graphics and documentation, of industrial engineering and preservation and access of CH. This paper aims at drawing attention to the actual technologies in use for solid printing (digital fabrication) used for the realization of material copies, therefore tangible, of three-dimensional digital virtual models. Even though ulterior developments to these technologies are possibilities to be expected, the process of 3D printing has gradually gained levels of accuracy, which can nowadays be deemed as satisfying. This is even more true in the industrial field (from the manufacturing industry to the design industry), but also in other fields, such as the medical one, for example, for the realization of artificial limbs, and the CH field, which can benefit from new instruments for the restoration and preservation of cultural assets in museums. The metric characteristics of precision and accuracy of the model printed with 3D technology are the fundaments for everything concerning Geomatics, and have to be related with the same characteristics of the digital model obtained through the survey analysis. In other terms, the precision of the printed product must be evaluated in relation to the precision of the instruments used in the analysis. Thus, in the CH field there is the possibility of new systems of access, cataloguing and study, where the models, both virtual and tangible, represent the fundament of visualization and analysis of the form (also from the metric point of view) of each artefact of artistic and historical interest
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