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PolyGen: An autoregressive generative model of 3d meshes 37

PolyGen: An autoregressive generative model of 3D meshes

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37th International conference on Machine Learning, ICML 2020

作者： Nash, Charlie Ganin, Yaroslav Eslami, S.M. Ali Battaglia, Peter W. DeepMind London United Kingdom

ISBN: (纸本)9781713821120

Polygon meshes are an efficient representation of 3d geometry, and are of central importance in computer graphics, robotics and games development. Existing learning-based approaches for object synthesis have avoided the challenges of working with 3d meshes, instead using alternative object representations that are more compatible with neural architectures and training approaches. We present PolyGen, a generative model of 3d objects which models the mesh directly, predicting vertices and faces sequentially using a Transformer-based architecture. Our model can condition on a range of inputs, including object classes, voxels, and images, and because the model is probabilistic it can produce samples that capture uncertainty in ambiguous scenarios. We show that the model is capable of producing high-quality, usable meshes, and establish log-likelihood benchmarks for the mesh-modelling task. We also evaluate the conditional models on surface reconstruction metrics against alternative methods, and demonstrate competitive performance despite not training directly on this task. © 2020 37th International conference on Machine Learning, ICML 2020. All rights reserved.

关键词： Computer games

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THE INTEGRATEd 3d SURVEY FOR UNdERGROUNd ARCHAEOLOGICAL ENVIRONMENT 8

THE INTEGRATED 3D SURVEY FOR UNDERGROUND ARCHAEOLOGICAL ENVI...

引用

8th International Workshop on 3d virtual reconstruction and visualization of complex architectures (3d-ARCH)

作者： Ebolese, d. Lo Brutto, M. dardanelli, G. Univ Palermo Dept Cultures & Soc Palermo Italy Univ Palermo Dept Engn Palermo Italy

The task of documentation and conservation of Cultural Heritage defines the challenges that geomatics techniques have to overtake in order to provide different solutions that combine the automation of processes with accurate results. The employment of integrated technologies allows improving the documentation of Cultural Heritage from a quantitative and qualitative point of view. The use of range and image-based techniques ensures the possibility to completely record articulated structures such as building with underground environments. The latter present often problematic survey conditions that imposed well planned and appropriate solutions. In this context, the paper presents the results of a 3d survey of the underground "Sybil hypogeum" and the related overhead church located in the Archaeological Park of Lilibeo (Marsala, Southern Italy). An integrated survey was planned in order to combine laser scanning technology with terrestrial-based and Unmanned Aerial Vehicle (UAV)-based photogrammetry to acquire the three-dimensional data of the whole complex (underground environments and overhead church). The aims of the work are related to test a topographic approach by a traverse method for scans registration and to archive a complete and detailed 3d model of the whole area. This model could be used to prevent the risk of information's loss and to improve the knowledge of the site.

关键词： 3d survey Archaeology Laser scanning Close-range photogrammetry UAV 3d Modelling

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ACCESS ANd WEB-SHARING OF 3d dIGITAL dOCUMENTATION OF ENVIRONMENTAL ANd ARCHITECTURAL HERITAGE 8

ACCESS AND WEB-SHARING OF 3D DIGITAL DOCUMENTATION OF ENVIRO...

引用

8th International Workshop on 3d virtual reconstruction and visualization of complex architectures (3d-ARCH)

作者： Tommasi, C. Fiorillo, F. Fernandez-Palacios, B. Jimenez Achille, C. Politecn Milan Dept Architecture Built Environm & Construct Engn Milan Italy Univ Salamanca Dept Cartog & Terrain Engn Polytech Sch Avila Avila Spain

The techniques and methods to capture and represent in a three-dimensional digital space the shape of objects belonging to Cultural Heritage have become more widespread, regarding both the economic and practical accessibility of technologies and equipment. At the same time, systems and tools have developed to integrate different 3d survey techniques that allow to achievement a complete acquisition of the tangible assets, considering the purposes of the survey, the required accuracy and the representation scale. The product of an integrated (image-based and range-base acquisition) and multi-scale (architectural and landscape scale) digital survey is a metric 3d reconstruction, potentially suitable for a broader 'use' and 'user' and not only for visualisation and documentation. According to this vision, the 3d model becomes a container of information, which include different type of data depending on the users and the aim of the work. The final result of this process can be the valorisation of the Cultural Heritage and its environment, through the access from experts and non-experts users. The aim of the article is showing the entire pipeline for 3d measurement, survey data acquisition, modelling, and representation of tangible assets and the related layers of information, as "best practice" to improve the Cultural Heritage knowledge, fruition, and sharing.

关键词： Cultural Heritage 3d documentation 3d surveying HBIM Valorisation

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INTERACTIVE IMAGE GEOLOCALIZATION IN AN IMMERSIVE WEB APPLICATION 8

INTERACTIVE IMAGE GEOLOCALIZATION IN AN IMMERSIVE WEB APPLIC...

引用

8th International Workshop on 3d virtual reconstruction and visualization of complex architectures (3d-ARCH)

作者： Harrach, Mouna devaux, Alexandre Bredif, Mathieu Univ Paris Est LASTIG GEOVIS IGN ENSG F-94160 St Mande France

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.

关键词： 3d web application historical images pose estimation georeferencing

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HBIM ANd THE 20TH CENTURY STEEL BUILdING HERITAGE A PROCEdURE SUITABLE FOR THE CONSTRUCTION HISTORY IN ITALY 8

HBIM AND THE 20TH CENTURY STEEL BUILDING HERITAGE A PROCEDUR...

引用

8th International Workshop on 3d virtual reconstruction and visualization of complex architectures (3d-ARCH)

作者： Morganti, R. Tosone, A. di donato, d. Abita, M. Univ Aquila Dept Civil Construct Architectural & Environm Eng DICEAA Laquila Italy

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.

关键词： HBIM Italian Architectural Heritage Steel Modern Movement

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UNCERTAINTY visualization APPROACHES FOR 3d MOdELS OF CASTLES RESTITUTEd FROM ARCHEOLOGICAL KNOWLEdGE 8

UNCERTAINTY VISUALIZATION APPROACHES FOR 3D MODELS OF CASTLE...

引用

8th International Workshop on 3d virtual reconstruction and visualization of complex architectures (3d-ARCH)

作者： Landes, T. Heissler, M. Koehl, M. Benazzi, T. Nivola, T. INSA Strasbourg UMR 7357 ICube Lab Photogrammetry & Geomat Grp Strasbourg France Cty Council Bas Rhin Cultural Heritage Serv Strasbourg France

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 reconstructed 3d 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 proposed 3d model of the reconstructed castle regarding its reliability is demonstrated.

关键词： Restitution Uncertainty visualization Archeological knowledge Point Cloud Assessment reliability

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THE virtual BATCAVE: A PROJECT FOR THE SAFEGUARd OF A UNESCO WHL FRAGILE ECOSYSTEM 8

THE VIRTUAL BATCAVE: A PROJECT FOR THE SAFEGUARD OF A UNESCO...

引用

8th International Workshop on 3d virtual reconstruction and visualization of complex architectures (3d-ARCH)

作者： Aiello, d. Basso, A. Spena, M. T. d'Agostino, G. Montedoro, U. Galizia, M. Grasso, R. Santagati, C. Univ Catania Dept Civil Engn & Architecture Via Santa Sofia 64 I-95123 Catania Italy Univ G dAnnunzio Dept Architecture Viale Pindaro I-65127 Pescara Italy Univ Catania Dept Biol Geol & Environm Sci Catania Italy Microgeo Via Petrarca 42Campi Bisenzio Florence Italy

This abstract illustrates an interdisciplinary research project which focuses on the study, conservation and enhancement, through 3d digitization and virtual 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 3d database 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 3d digitization 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.

关键词： Laser scanning virtual Reality Serious Game Natural Heritage Photogrammetry digital Cultural Heritage

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3d Modeling Surveying Tasks in Photogrammetry

3D Modeling Surveying Tasks in Photogrammetry

引用

2020 International Russian Automation conference, RusAutoCon 2020

作者： Izvozchikova, V.V. Shardakov, V.M. Mezhenin, A.V. Orenburg State University Department of Informatics Orenburg Russia Itmo University Faculty of Software Engineering and Computer Engineering Saint-Petersburg Russia

ISBN: (数字)9781728161303

ISBN: (纸本)9781728161303

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 stages of devices and systems. In addition, virtual simulators simulating real operating conditions, it is proposed to use for testing and modeling methods of shooting mobile video systems. It is assumed that the means of 3d-graphics emulates not only the environment, shooting conditions, but also the video systems themselves: means of technical vision, onboard cameras of robots and UAVs. The use of such simulators will allow to create, improve and test various algorithms of applied intelligent systems without creating complex expensive stands, will save time for various experiments. The article deals with the evaluation of the quality of recognition and reconstruction systems using a polygonal grid as a data representation. The results of testing these methods: the use of virtual environments and the assessment of the similarity of the polygon meshes. At the stage of segmentation and finding the vertices and segments of the objects under study demonstrated the use of both real images obtained by a real camera and synthesized images. during the reconstruction phase, a set of synthesized images was also used to test one of the reconstruction systems. To assess the similarity of polygonal objects based on the Hausdorff dimension, the corresponding functions were developed and the result of their work is given. © 2020 IEEE.

关键词： Unmanned aerial vehicles (UAV)

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A COMPARATIVE STUdY AMONG THREE REGISTRATION ALGORITHMS: PERFORMANCE, QUALITY ASSURANCE ANd ACCURACY 8

A COMPARATIVE STUDY AMONG THREE REGISTRATION ALGORITHMS: PER...

引用

8th International Workshop on 3d virtual reconstruction and visualization of complex architectures (3d-ARCH)

作者： Wujanz, d. Barazzetti, L. Previtali, M. Scaioni, M. Technet GmbH Lehnshof 8 D-13467 Berlin Germany Politecn Milan Dept Architecture Built Environm & Construct Engn Via Ponzio 31 Milan Italy

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.

关键词： Accuracy Automation Least Squares Registration Terrestrial Laser Scanning

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A COMPARISON BETWEEN TLS ANd UAV TECHNOLOGIES FOR HISTORICAL INVESTIGATION 8

A COMPARISON BETWEEN TLS AND UAV TECHNOLOGIES FOR HISTORICAL...

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8th International Workshop on 3d virtual reconstruction and visualization of complex architectures (3d-ARCH)

作者： Valenti, R. Paterno, E. Univ Catania Special Educ Struct Architecture DICAR Syracuse Italy

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 implemented digital 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 investigated 3d 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 and 3d processing systems in order to carry out historical analyses and investigations in closed environments and for small scale architecture. Starting from the acquired data, 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.

关键词： 3d Survey photogrammetry solomonic order 3d modelling cultural heritage Andrea Pozzo St Ignazio altar

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