For a long time people have been interested in the past and history and how we can go back in time using a time machine. And while we cannot invent a time machine, at least not yet, we can create a virtual one. Our &q...
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For a long time people have been interested in the past and history and how we can go back in time using a time machine. And while we cannot invent a time machine, at least not yet, we can create a virtual one. Our "virtual" time machine is an interactive web application that allows users to browse through and navigate within historical images (aerial/terrestrial photographs or postcards) that are projected on a 3d photogrammetric model (point cloud or 3d mesh), thus going back in time and interacting with historical 3d models and images. This was achieved by adopting a semiautomatic approach where the user identifies first 6 to 8 hints on the historical image and the photogrammetric model, then this information is used as an entry data to a photogrammetric software that computes the pose and orientation of the image. The purpose of this work, which is part of the ALEGORIA project, is to preserve cultural heritage, to give the users the opportunity to go back in time and study history of a place or simply discover how their hometown looked some years ago.
In the cultural heritage field, several specialists like archaeologists, architects, geomaticians, historians, etc. are used to work together. With the upcoming technologies allowing to capture efficiently data in the...
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In the cultural heritage field, several specialists like archaeologists, architects, geomaticians, historians, etc. are used to work together. With the upcoming technologies allowing to capture efficiently data in the field, to digitize historical documents, to collect worldwide information related to the monuments under study, the wish to summarize all the sources of data (including the knowledge of the specialists) into one 3d model is a big challenge. In order to guarantee the reliability of the proposed reconstructed3d model, it is of crucial importance to integrate the level of uncertainty assigned to it. From a geometric point of view, uncertainty is often defined, quantified and expressed with the help of statistical measures. However, for objects reconstructed based on archaeological assumptions, statistical measures are not appropriate. This paper focuses on the decomposition of 3d models into levels of uncertainties (LoUs) and on the best way to visualize them through two case studies: the castle of Kagenfels and the Horbourg-Wihr Castellum, both located in Alsace, France. The first one is well documented through still ongoing excavations around its remains, whereas the second one disappeared under the urbanization of the city. An approach enabling, on the 3d models, not only to quantify but also to visualize uncertainties coming from archaeological assumptions is addressed. Finally, the efficiency of the approach for qualifying the proposed3d model of the reconstructed castle regarding its reliability is demonstrated.
The use of steel technologies in Italian architecture still represents an unexplored field of research, characterised by limited and fragmented episodes that reveal important design experimentations and relevant archi...
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The use of steel technologies in Italian architecture still represents an unexplored field of research, characterised by limited and fragmented episodes that reveal important design experimentations and relevant architectural results of the 20th century. For this reason, the aim of the research consists of defining a HBIM methodological approach addressed to the study of modern steel architectures, considering their specific features and their hybrid constructive nature. Indeed these buildings are often characterized by a high level of industrial production of building components merged with the recovery of a craftsmanship tradition, particularly appearing at the scale of structure and envelope details. The balance between standardization and traditional techniques in production processes, leads to the definition of a HBIM method composed of three steps: an operational tools for existing buildings of 20th century made of steel that could support the construction of building digital archives, the organisation of maintenance programs and possible transformative actions, avoiding the loss of this heritage sometimes caused by bad interventions that deeply change original and valuable features of these architectures.
This abstract illustrates an interdisciplinary research project which focuses on the study, conservation and enhancement, through 3ddigitization andvirtual fruition, of an asset of great naturalistic, historical and...
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This abstract illustrates an interdisciplinary research project which focuses on the study, conservation and enhancement, through 3ddigitization andvirtual fruition, of an asset of great naturalistic, historical and ethnoanthropological value: Grotta dei Pipistrelli of Pantalica Nature Reserve (Sortino, SR). The cave (located in the Calcinara necropolis) is characterized by a great beauty as well as by a high cultural relevance and a remarkable scientific importance. In 2005, it awarded the UNESCO World Heritage title for its high historic, archaeological and speleological profile. despite the site is being studied by specialists in chiropterofauna, nowadays there is not a comprehensive and reliable documentation of the plano-altimetric morphology of the cave, able to constitute a 3ddatabase of essential information (e.g. morphological, geological, textural and wildlife information) for current and future studies, and to preserve the memory of this fragile ecosystem. The process of 3ddigitization aims to create a model of the cave that allows us to enjoy this place, to explore it and to closely understand it in order to limit the anthropic pressure caused by visitors on the real site. Consequently, it is proposed the creation of a virtual environment, as a reproduction of the real one, which can be enjoyed by all categories of users.
The research is aimed at the development of virtual environments of various configurations created by means of 3d computer modeling in such areas as photogrammetry, computer vision systems, robotics at the design stag...
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A critical task in every terrestrial laser scanning project is the transformation (addressed to as registration or alignment) of multiple point clouds into a common reference system. Even though this operation appears...
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A critical task in every terrestrial laser scanning project is the transformation (addressed to as registration or alignment) of multiple point clouds into a common reference system. Even though this operation appears to be a solved and well-understood problem, the vast majority of available techniques still lack meaningful quality measures that allow the user to understand and analyze the final outputs. The erroneous estimation of registration parameters may cause systematic biases that falsify those subsequently outcomes such as deformation measurements on historical buildings, CAd-drawings of individual elements, or 3d models devoted to analyze the verticality of a tower. Thus, this article compares three common registration algorithms, namely target-based registration, the Iterative-Closest Point algorithm (ICP) as well as a plane-based approach on examples related to different case studies concerning historical buildings.
The architectural and sculptural value of the investigated Cultural Heritage has suggested a variety of possible approaches ranging from the traditional modus operandi to the implementation of innovative technology. T...
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The architectural and sculptural value of the investigated Cultural Heritage has suggested a variety of possible approaches ranging from the traditional modus operandi to the implementation of innovative technology. The conducted research implementeddigital and automatic photogrammetry software using Structure from Motion or SFM. These techniques which involve the convergence of different disciplines, such as Computer Vision and photogrammetry seek to generate 3d models, that is the mathematical representation of the investigated3d objects. The integration of UAS, photogrammetry and TLS develops 3d models able to provide more detailed information. The main purpose of the present research is to test the potentialities offered by the new survey and3d processing systems in order to carry out historical analyses and investigations in closed environments and for small scale architecture. Starting from the acquireddata, the 3d models of the altars allow a 3d comparison between the works object of study and Pozzo's treatise, also allowing speculation about their possible relations, providing extraordinary outcomes from the point of view of survey integrated methodologies and from the point of view of historical and geometric interpretation.
This work aims at presenting the use of new technologies in the field of forensic engineering. In particular, the use of UAV photogrammetry and laser scanning is compared with the traditional methods of surveying an a...
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This work aims at presenting the use of new technologies in the field of forensic engineering. In particular, the use of UAV photogrammetry and laser scanning is compared with the traditional methods of surveying an accident site. In this framework, surveys must be carried out promptly, executed in a short time and performed so that the greatest possible amount of information is collected with sufficient accuracy to avoid the possibility of neglecting details once that the scene is no longer preserved. The combination of modern surveying techniques such UAV photogrammetry and laser scanning can properly fulfill these requirements. An experimental test has been arranged and instruments, procedures, settings, practical limits and results have been evaluated and compared with respect to the usual way of performing the survey for forensic purposes. In particular, both qualitative and quantitative considerations are given, assessing the completeness of the reconstructed model, the statistical evaluation of the errors and the accuracy achieved.
The relationship between cultural heritage, digital technologies and visual models involves an increasingly wide area of research, oriented towards the renewal of archives and museums for the preservation and promotio...
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The relationship between cultural heritage, digital technologies and visual models involves an increasingly wide area of research, oriented towards the renewal of archives and museums for the preservation and promotion of culture. Recent research activities are the result of the progressive strengthening of digital technologies and the needs of a new generation of "digital" users, which requires museums to update their means of communication using Semantic Web languages and technologies shaped by a social conceptualization of a graph-based representation of information. The growth of several digitized heritage collections increases the necessity of proper methodologies to develop a structured system able to access to these collections and the large amount of data, metadata and paradata related to the digitized objects in a structured and organized way, defining a set of collection information models (CIM), that considers not only the digitizing process but also the data collection process, layered by an Upper Ontology level structure, based on CIdOC-CRM.
This paper presents the analysis of possible methods of a terrestrial laser scanning (TLS) data registration using 2d/3ddetectors anddescriptors. The developed approach, where point clouds are processed in form of p...
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This paper presents the analysis of possible methods of a terrestrial laser scanning (TLS) data registration using 2d/3ddetectors anddescriptors. The developed approach, where point clouds are processed in form of panoramic images, orthoimages and3ddata, was described. The accuracy of the registration process was preliminary verified. The two approaches were analysed and compared: the 2d SIFT (Scale-Invariant Feature Transform) detector anddescriptor with the rasterized TLS data and the 3d SIFT detector with the 3d FPFH (Fast Point Feature Histograms) descriptor. The feature points were found and preliminary matched using the OpenCV and PCL (Point Cloud Library) libraries. In order to find the best point cloud representation for the registration process, both the percentage anddistribution of the correctly detected and matched points were analysed. The materials consisted of the point clouds of two chambers from the Museum of King John III's Palace in Wilanow. They were acquired using the Z+F 5006h and 5003 TLS scanners. The performed analysis showed that the lowest RMSE values were for the 2ddetectors and orthoimages. However, in the case of the point number anddistribution, better results were obtained for using the 3ddetector.
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