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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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TOWARdS RAdIOMETRICAL ALIGNMENT OF 3d POINT CLOUdS

TOWARDS RADIOMETRICAL ALIGNMENT OF 3D POINT CLOUDS

引用

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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AUTOMATIC ANALYSIS ANd CLASSIFICATION OF THE ROOF SURFACES FOR THE INSTALLATION OF SOLAR PANELS USING A MULTI-dATA SOURCE ANd MULTI-SENSOR AERIAL PLATFORM 6

AUTOMATIC ANALYSIS AND CLASSIFICATION OF THE ROOF SURFACES F...

引用

conference on 3d-Arch 2015 - 3d virtual reconstruction and visualization of complex architectures

作者： Lopez, L. Lagueela, S. Picon, Inmaculada Gonzalez-Aguilera, d. Univ Salamanca Dept Cartog & Land Engn Avila 05003 Spain Univ Vigo Appl Geotechnol Res Grp Vigo 36310 Spain

ISBN: (纸本)9781629935201

A low-cost multi-sensor aerial platform, aerial trike, equipped with visible and thermographic sensors is used for the acquisition of all the data needed for the automatic analysis and classification of roof surfaces regarding their suitability to harbour solar panels. The geometry of a georeferenced 3d point cloud generated from visible images using photogrammetric and computer vision algorithms, and the temperatures measured on thermographic images are decisive to evaluate the surfaces, slopes, orientations and the existence of obstacles. This way, large areas may be efficiently analysed obtaining as final result the optimal locations for the placement of solar panels as well as the required geometry of the supports for the installation of the panels in those roofs where geometry is not optimal.

关键词： 3d reconstruction aerial trike photogrammetry infrared thermography point cloud buildings solar influence solar panel

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PROCEdURAL MOdELING FOR RAPId-PROTOTYPING OF MULTIPLE BUILdING PHASES

PROCEDURAL MODELING FOR RAPID-PROTOTYPING OF MULTIPLE BUILDI...

引用

conference on 3d virtual reconstruction and visualization of complex architectures (3d-ARCH)

作者： Saldana, M. Johanson, C. Univ Calif Los Angeles Dept Architecture & Urban Design Los Angeles CA 90095 USA Univ Calif Los Angeles Dept Class Los Angeles CA 90095 USA

ISBN: (纸本)9781629935201

RomeLab is a multidisciplinary working group at UCLA that uses the city of Rome as a laboratory for the exploration of research approaches and dissemination practices centered on the intersection of space and time in antiquity. In this paper we present a multi-platform workflow for the rapid-prototyping of historical cityscapes through the use of geographic information systems, procedural modeling, and interactive game development. Our workflow begins by aggregating archaeological data in a GIS database. Next, 3d building models are generated from the ArcMap shapefiles in Esri CityEngine using procedural modeling techniques. A GIS-based terrain model is also adjusted in CityEngine to fit the building elevations. Finally, the terrain and city models are combined in Unity, a game engine which we used to produce web-based interactive environments which are linked to the GIS data using keyhole markup language (KML). The goal of our workflow is to demonstrate that knowledge generated within a first-person virtual world experience can inform the evaluation of data derived from textual and archaeological sources, and vice versa.

关键词： Procedural Modeling Architectural reconstruction GIS Interactive Games virtual Worlds

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virtual dIVING IN THE UNdERWATER ARCHAEOLOGICAL SITE OF CALA MINNOLA

VIRTUAL DIVING IN THE UNDERWATER ARCHAEOLOGICAL SITE OF CALA...

引用

conference on 3d virtual reconstruction and visualization of complex architectures

作者： Bruno, F. Lagudi, A. Barbieri, L. Muzzupappa, M. Mangeruga, M. Pupo, F. Cozza, M. Cozza, A. Ritacco, G. Peluso, R. Tusa, S. Univ Calabria Dept Mech Energy & Management Engn DIMEG I-87036 Arcavacata Di Rende CS Italy Univ Calabria Dept Elect Comp Sci & Syst Sci DIMES I-87036 Arcavacata Di Rende CS Italy 3DResearch Srl I-87036 Arcavacata Di Rende CS Italy Soprintendenza Mare Reg Sicilia I-90133 Palermo Italy

The paper presents the application of the technologies and methods defined in the VISAS project for the case study of the underwater archaeological site of Cala Minnola located in the island of Levanzo, in the archipelago of the Aegadian Islands (Sicily, Italy). The VISAS project (http://***) aims to improve the responsible and sustainable exploitation of the Underwater Cultural Heritage by means the development of new methods and technologies including an innovative virtual tour of the submerged archaeological sites. In particular, the paper describes the 3d reconstruction of the underwater archaeological site of Cala Minnola and focus on the development of the virtual scene for its visualization and exploitation. The virtual dive of the underwater archaeological site allows users to live a recreational and educational experience by receiving historical, archaeological and biological information about the submerged exhibits, the flora and fauna of the place.

关键词： virtual Reality virtual exploitation underwater 3d reconstruction Underwater Cultural Heritage

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THE "ART OF WAR FRIEZE" IN URBINO: A BLENd OF virtual reconstruction ANd SCIENTIFIC ACCURACY

THE "ART OF WAR FRIEZE" IN URBINO: A BLEND OF VIRTUAL RECONS...

引用

conference on 3d virtual reconstruction and visualization of complex architectures (3d-ARCH)

作者： Baratin, Laura Giuliano, Monica Checcucci, Giovanni Univ Urbino DiSBEF I-60129 Urbino Italy ABC Gen Engn Srl I-50132 Florence Italy

ISBN: (纸本)9781629935201

The Art of War Frieze was commissioned by Federico da Montefeltro, duke of Urbino, to decorate the back of the "wing facade" of the ducal palace. The Frieze decorated the facade from the time it was realised towards the end of the XVth century until 1756. The Frieze consists of a very particular series of seventy-two limestone bas-reliefs, whose iconographic repertoire represents numerous war and building machines as well as military and political symbols. After it broke away from the outdoor facade it was stored in different rooms in the Palace but despite the many documentary records available, the question of the original sequence of the bas-reliefs has never been resolved. The primary scope of this paper is to create a "virtual" reconstruction of the original sequence of the bas-reliefs, starting from historical and iconographic records, an analysis of the back and the individual panels using a laser scanner and fully automatic open source photo modelling technologies like the Arc3d, and photogrammetric systems like Image Master together with analyses of the state of conservation, type of degradation correlated to atmospheric parameters (sunlight, temperature, rain). Tests will then be carried out with different systems in order to confirm the accuracy of the model if it is decided to reproduce the individual panels using the rapid prototyping technique associated to a study of the execution techniques.

关键词： 3d MOdEL CONSERVATION HISTORICAL MONUMENTS dIGITAL MAP PHOTOGRAMMETRY LASER SCANNER

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ACCURATE MULTIVIEW STEREO reconstruction WITH FAST VISIBILITY INTEGRATION ANd TIGHT dISPARITY BOUNdING

ACCURATE MULTIVIEW STEREO RECONSTRUCTION WITH FAST VISIBILIT...

引用

conference on 3d virtual reconstruction and visualization of complex architectures (3d-ARCH)

作者： Toldo, R. Fantini, F. Giona, L. Fantoni, S. Fusiello, A. 3Dflow Srl I-37134 Verona Italy Univ Udine Dipartimento Ingn Elettr Gest & Meccan I-33100 Udine Italy

ISBN: (纸本)9781629935201

A novel multi-view stereo reconstruction method is presented. The algorithm is focused on accuracy and it is highly engineered with some parts taking advantage of the graphics processing unit. In addition, it is seamlessly integrated with the output of a structure and motion pipeline. In the first part of the algorithm a depth map is extracted independently for each image. The final depth map is generated from the depth hypothesis using a Markov random field optimization technique over the image grid. An octree data structure accumulates the votes coming from each depth map. A novel procedure to remove rogue points is proposed that takes into account the visibility information and the matching score of each point. Finally a texture map is built by wisely making use of both the visibility and the view angle informations. Several results show the effectiveness of the algorithm under different working scenarios.

关键词： Multiview Stereo Image-based Modelling Surface reconstruction Structure from Motion

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3d virtual reconstruction OF AN URBAN HISTORICAL SPACE: A CONSIdERATION ON THE METHOd 4

3D VIRTUAL RECONSTRUCTION OF AN URBAN HISTORICAL SPACE: A CO...

引用

4th ISPRS International Workshop 3d-ARCH - 3d virtual reconstruction and visualization of complex architectures

作者： Galizia, M. Santagati, C. Fac Engn Dept Architecture I-95125 Catania Italy

Urban historical spaces are often characterized by a variety of shapes, geometries, volumes, materials. Their virtual reconstruction requires a critical approach in terms of acquired data` s density, timing optimization, final product's quality and slimness. The research team has focused its attention on the study on Francesco Neglia square (previously named Saint Thomas square) in Enna. This square is an urban space fronted by architectures which present historical and stylistic differences. For example you can find the Saint Thomas'church belfry (in aragounese-catalan stile dated XIV century) and the porch, the Anime Sante baroque's church (XVII century), Saint Mary of the Grace's nunnery (XVIII century) and as well as some civil buildings of minor importance built in the mid twentieth century. The research has compared two different modeling tools approaches: the first one is based on the construction of triangulated surfaces which are segmented and simplified;the second one is based on the detection of surfaces geometrical features, the extraction of the more significant profiles by using a software dedicated to the elaboration of cloud points and the subsequent mathematical reconstruction by using a 3d modelling software. The following step was aimed to process the virtual reconstruction of urban scene by assembling the single optimized models. This work highlighted the importance of the image of the operator and of its cultural contribution, essential to recognize geometries which generates surfaces in order to create high quality semantic models.

关键词： laser scanning 3d modeling knowledge urban space

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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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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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THE USE OF 3d MOdELS IN INTEGRATEd SURVEY: THE CHURCH OF ST. THOMAS OF VILLANOVA IN CASTEL GANdOLFO 4

THE USE OF 3D MODELS IN INTEGRATED SURVEY: THE CHURCH OF ST....

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4th ISPRS International Workshop 3d-ARCH - 3d virtual reconstruction and visualization of complex architectures

作者： Canciani, M. Saccone, M. Roma Tre Univ Dept Planning & Architectural Studies Rome Italy

The research illustrated below describes the integrated survey method as applied to the Church of St. Thomas of Villanova in Castel Gandolfo, the work of G.L. Bernini. In particular, integration of the various survey methods with 3d modelling to reconstruct all the elements with complex and/or hard to measure geometries has made it possible to obtain an accurate survey model. Comparison of this model with Bernini's original project, based on the analysis of several drawings, has given a clearer view of certain aspects of the design and of Bernini's planning methods.

关键词： San Tommaso da Villanova in Castel Gandolfo GL Bernini Integrated survey Measurement model design model Representation model

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