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检索条件"任意字段=Conference on 3D Virtual Reconstruction and Visualization of Complex Architectures"

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PROCEdURAL 3d MOdELLING FOR TRAdITIONAL SETTLEMENTS. THE CASE STUdY OF CENTRAL ZAGORI

PROCEDURAL 3D MODELLING FOR TRADITIONAL SETTLEMENTS. THE CAS...

引用

conference on 3d virtual reconstruction and visualization of complex architectures

作者： Kitsakis, d. Tsiliakou, E. Labropoulos, T. dimopoulou, E. NTUA Sch Rural & Surveying Engn Zografos 15780 Greece

Over the last decades 3d modelling has been a fast growing field in Geographic Information Science, extensively applied in various domains including reconstruction and visualization of cultural heritage, especially monuments and traditional settlements. Technological advances in computer graphics, allow for modelling of complex 3d objects achieving high precision and accuracy. Procedural modelling is an effective tool and a relatively novel method, based on algorithmic modelling concept. It is utilized for the generation of accurate 3d models and composite facade textures from sets of rules which are called Computer Generated Architecture grammars (CGA grammars), defining the objects' detailed geometry, rather than altering or editing the model manually. In this paper, procedural modelling tools have been exploited to generate the 3d model of a traditional settlement in the region of Central Zagori in Greece. The detailed geometries of 3d models derived from the application of shape grammars on selected footprints, and the process resulted in a final 3d model, optimally describing the built environment of Central Zagori, in three levels of detail (Lod). The final 3d scene was exported and published as 3d web-scene which can be viewed with 3d CityEngine viewer, giving a walkthrough the whole model, same as in virtual reality or game environments. This research work addresses issues regarding textures' precision, Lod for 3d objects and interactive visualization within one 3d scene, as well as the effectiveness of large scale modelling, along with the benefits and drawbacks that derive from procedural modelling techniques in the field of cultural heritage and more specifically on 3d modelling of traditional settlements.

关键词： 3d modelling procedural modelling traditional architecture cultural heritage Zagori 3d Cadastre

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INTEROPERABILITY MATTER: LEVELS OF dATA SHARING, STARTING FROM A 3d INFORMATION MOdELLING

INTEROPERABILITY MATTER: LEVELS OF DATA SHARING, STARTING FR...

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conference on 3d virtual reconstruction and visualization of complex architectures

作者： Tommasi, C. Achille, C. Politecn Milan ABC Dept Survey Grp 3D Milan Italy

Nowadays, the adoption of BIM processes in the AEC (Architecture, Engineering and Construction) industry means to be oriented towards synergistic workflows, based on informative instruments capable of realizing the virtual model of the building. The target of this article is to speak about the interoperability matter, approaching the subject through a theoretical part and also a practice example, in order to show how these notions are applicable in real situations. In particular, the case study analysed belongs to the Cultural Heritage field, where it is possible to find some difficulties - both in the modelling and sharing phases - due to the complexity of shapes and elements. Focusing on the interoperability between different software, the questions are: What and how many kind of information can I share? Given that this process leads also to a standardization of the modelled parts, is there the possibility of an accuracy loss?

关键词： BIM Interoperability Cultural Heritage Accuracy Standardization reality-based modelling data sharing

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FROM TLS POINT CLOUdS TO 3d MOdELS OF TREES: A COMPARISON OF EXISTING ALGORITHMS FOR 3d TREE reconstruction

FROM TLS POINT CLOUDS TO 3D MODELS OF TREES: A COMPARISON OF...

引用

conference on 3d virtual reconstruction and visualization of complex architectures

作者： Bournez, E. Landes, T. Saudreau, M. Kastendeuch, P. Najjar, G. Univ Strasbourg CNRS INSA Strasbourg ICube LabUMR 7357 Strasbourg France Univ Blaise Pascal UMR547 PIAF Lab INRA Clermont Ferrand Clermont Ferrand France

3d models of tree geometry are important for numerous studies, such as for urban planning or agricultural studies. In climatology, tree models can be necessary for simulating the cooling effect of trees by estimating their evapotranspiration. The literature shows that the more accurate the 3d structure of a tree is, the more accurate microclimate models are. This is the reason why, since 2013, we have been developing an algorithm for the reconstruction of trees from terrestrial laser scanner (TLS) data, which we call TreeArchitecture. Meanwhile, new promising algorithms dedicated to tree reconstruction have emerged in the literature. In this paper, we assess the capacity of our algorithm and of two others - PlantScan3d and SimpleTree- to reconstruct the 3d structure of trees. The aim of this reconstruction is to be able to characterize the geometric complexity of trees, with different heights, sizes and shapes of branches. Based on a specific surveying workflow with a TLS, we have acquired dense point clouds of six different urban trees, with specific architectures, before reconstructing them with each algorithm. Finally, qualitative and quantitative assessments of the models are performed using reference tree reconstructions and field measurements. Based on this assessment, the advantages and the limits of every reconstruction algorithm are highlighted. Anyway, very satisfying results can be reached for 3d reconstructions of tree topology as well as of tree volume.

关键词： Trees Terrestrial Laser Scanner Point Cloud 3d Model reconstruction Algorithm Assessment Accuracy

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CRITICAL ANALYSIS ANd dIGITAL reconstructionS OF ALBERTI'S architectures BY THE USE OF 3d MORPHOMETRIC INTEGRATEd SURVEY dATABASE

CRITICAL ANALYSIS AND DIGITAL RECONSTRUCTIONS OF ALBERTI'S A...

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conference on 3d virtual reconstruction and visualization of complex architectures

作者： Ferrari, F. Medici, M. Univ Ferrara Dept Architecture Ferrara Italy

Since 2005, dIAPReM Centre of the department of Architecture of the University of Ferrara, in collaboration with the "Centro Studi Leon Battista Alberti" Foundation and the Consorzio Futuro in Ricerca, is carrying out a research project for the creation of 3d databases that could allow the development of a critical interpretation of Alberti's architectural work. The project is primarily based on a common three-dimensional integrated survey methodology for the creation of a navigable multilayered database. The research allows the possibility of reiterative metrical analysis, thanks to the use of a coherent data in order to check and validate hypothesis by researchers, art historians and scholars on Alberti's architectural work. Coherently with this methodological framework, indeed, two case studies are explained in this paper: the church of San Sebastiano in Matua and The Church of the Santissima Annunziata in Florence. Furthermore, thanks to a brief introduction of further developments of the project, a short graphical analysis of preliminary results on Tempio Malatestiano in Rimini opens new perspectives of research.

关键词： 3d survey laser scanner Leon Battista Alberti

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THE EFFECT OF UNdERWATER IMAGERY RAdIOMETRY ON 3d reconstruction ANd ORTHOIMAGERY

THE EFFECT OF UNDERWATER IMAGERY RADIOMETRY ON 3D RECONSTRUC...

引用

conference on 3d virtual reconstruction and visualization of complex architectures

作者： Agrafiotis, P. drakonakis, G. I. Georgopoulos, A. Skarlatos, d. Natl Tech Univ Athens Sch Rural & Surveying Engn Lab Photogrammetry Zografou Campus9 Heroon Polytech Str Athens 15780 Greece Cyprus Univ Technol Civil Engn & Geomat Dept Lab Photogrammetr Vis 2-8 Saripolou Str CY-3036 Limassol Cyprus

The work presented in this paper investigates the effect of the radiometry of the underwater imagery on automating the 3d reconstruction and the produced orthoimagery. Main aim is to investigate whether pre-processing of the underwater imagery improves the 3d reconstruction using automated SfM - MVS software or not. Since the processing of images either separately or in batch is a time-consuming procedure, it is critical to determine the necessity of implementing colour correction and enhancement before the SfM - MVS procedure or directly to the final orthoimage when the orthoimagery is the deliverable. Two different test sites were used to capture imagery ensuring different environmental conditions, depth and complexity. Three different image correction methods are applied: A very simple automated method using Adobe Photoshop, a developed colour correction algorithm using the CLAHE (Zuiderveld, 1994) method and an implementation of the algorithm described in Bianco et al., (2015). The produced point clouds using the initial and the corrected imagery are then being compared and evaluated.

关键词： Underwater 3d reconstruction Underwater Image Enhancement SfM-MVS

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INVESTIGATING THE EFFECT OF FOCUS STACKING ON SFM-MVS ALGORITHMS

INVESTIGATING THE EFFECT OF FOCUS STACKING ON SFM-MVS ALGORI...

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conference on 3d virtual reconstruction and visualization of complex architectures

作者： Kontogianni, G. Chliverou, R. Koutsoudis, A. Pavlidis, G. Georgopoulos, A. Natl Tech Univ Athens Sch Rural & Surveying Engn Lab Photogrammetry Zografos 15780 Greece Athena Res Ctr Univ Campus KimmeriaPOB 159 GR-67100 Xanthi Greece

The depth of Field (doF) is a vital factor in photogrammetric applications. Its effect is in most cases pretty obvious especially when capturing small artefacts. It is very important to observe its behaviour as it affects the ability to capture all the details of an object. Focus stacking is a technique in computational photography, in which a set of images focused on different planes with limited doF are combined in order to considerably extend the doF. Today, there is a number of focus stacking methods that can be applied in order to produce a full-focus image. In this paper, we investigate the application and effects of focus stacking on SfM-MVS 3d reconstruction. Specifically, our experiment involves the 3d reconstruction of a selected artefact using both traditional all-focus photography and focus stacking. The artefact has already been digitised with a high accuracy and resolution structured light 3d scanner, and that 3d model served as the reference model, with which SfM models were compared. We discuss on these fist results and present some preliminary assessment on the application of focus stacking for the SfM-MVS-based 3d reconstruction.

关键词： Focus Stacking SfM-MVS 3d reconstruction

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LOW-COST 3d LASER SCANNING IN AIR OR WATER USING SELF-CALIBRATING STRUCTUREd LIGHT

LOW-COST 3D LASER SCANNING IN AIR OR WATER USING SELF-CALIBR...

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conference on 3d virtual reconstruction and visualization of complex architectures

作者： Bleier, Michael Nuechter, Andreas Zentrum Telemat eV Wurzburg Germany Julius Maximilian Univ Wurzburg Informat Robot & Telemat 7 Wurzburg Germany

In-situ calibration of structured light scanners in underwater environments is time-consuming and complicated. This paper presents a self-calibrating line laser scanning system, which enables the creation of dense 3d models with a single fixed camera and a freely moving hand-held cross line laser projector. The proposed approach exploits geometric constraints, such as coplanarities, to recover the depth information and is applicable without any prior knowledge of the position and orientation of the laser projector. By employing an off-the-shelf underwater camera and a waterproof housing with high power line lasers an affordable 3d scanning solution can be built. In experiments the performance of the proposed technique is studied and compared with 3d reconstruction using explicit calibration. We demonstrate that the scanning system can be applied to above-the-water as well as underwater scenes.

关键词： underwater laser scanning structured light self-calibration 3d reconstruction

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3d MOdELLING ANd MAPPING FOR virtual EXPLORATION OF UNdERWATER ARCHAEOLOGY ASSETS

3D MODELLING AND MAPPING FOR VIRTUAL EXPLORATION OF UNDERWAT...

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conference on 3d virtual reconstruction and visualization of complex architectures

作者： Liarokapis, F. Kouril, P. Agrafiotis, P. demesticha, S. Chmelik, J. Skarlatos, d. Masaryk Univ Fac Informat HCI Lab Brno Czech Republic Cyprus Univ Technol Fac Engn & Technol Lemesos Cyprus Univ Cyprus Archaeol Res Unit Nicosia Cyprus

This paper investigates immersive technologies to increase exploration time in an underwater archaeological site, both for the public, as well as, for researchers and scholars. Focus is on the Mazotos shipwreck site in Cyprus, which is located 44 meters underwater. The aim of this work is two-fold: (a) realistic modelling and mapping of the site and (b) an immersive virtual reality visit. For 3d modelling and mapping optical data were used. The underwater exploration is composed of a variety of sea elements including: plants, fish, stones, and artefacts, which are randomly positioned. Users can experience an immersive virtual underwater visit in Mazotos shipwreck site and get some information about the shipwreck and its contents for raising their archaeological knowledge and cultural awareness.

关键词： Underwater Archaeology Underwater Photogrammetry virtual Reality

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TOWARdS RAdIOMETRICAL ALIGNMENT OF 3d POINT CLOUdS

TOWARDS RADIOMETRICAL ALIGNMENT OF 3D POINT CLOUDS

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conference on 3d virtual reconstruction and visualization of complex architectures

作者： Lauterbach, H. A. Borrmann, d. Nuechter, A. Julius Maximilians Univ Wurzburg Informat Robot & Telemat 7 Wurzburg Germany

3d laser scanners are typically not able to collect color information. Therefore coloring is often done by projecting photos of an additional camera to the 3d scans. The capturing process is time consuming and therefore prone to changes in the environment. The appearance of the colored point cloud is mainly effected by changes of lighting conditions and corresponding camera settings. In case of panorama images these exposure variations are typically corrected by radiometrical aligning the input images to each other. In this paper we adopt existing methods for panorama optimization in order to correct the coloring of point clouds. Therefore corresponding pixels from overlapping images are selected by using geometrically closest points of the registered 3d scans and their neighboring pixels in the images. The dynamic range of images in raw format allows for correction of large exposure differences. Two experiments demonstrate the abilities of the approach.

关键词： Laser scanning Color correction Colored Pointcloud Radiometrical Alignment

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A REVIEW OF POINT CLOUdS SEGMENTATION ANd CLASSIFICATION ALGORITHMS

A REVIEW OF POINT CLOUDS SEGMENTATION AND CLASSIFICATION ALG...

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conference on 3d virtual reconstruction and visualization of complex architectures

作者： Grilli, E. Menna, F. Remondino, F. Bruno Kessler Fdn FBK Unit 3DOM Trento Italy

Today 3d models and point clouds are very popular being currently used in several fields, shared through the internet and even accessed on mobile phones. despite their broad availability, there is still a relevant need of methods, preferably automatic, to provide 3d data with meaningful attributes that characterize and provide significance to the objects represented in 3d. Segmentation is the process of grouping point clouds into multiple homogeneous regions with similar properties whereas classification is the step that labels these regions. The main goal of this paper is to analyse the most popular methodologies and algorithms to segment and classify 3d point clouds. Strong and weak points of the different solutions presented in literature or implemented in commercial software will be listed and shortly explained. For some algorithms, the results of the segmentation and classification is shown using real examples at different scale in the Cultural Heritage field. Finally, open issues and research topics will be discussed.

关键词： Point Clouds Segmentation Classification Photogrammetry Laser Scanning

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