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UNdERWATER PHOTOGRAMMETRY, COdEd TARGET ANd PLENOPTIC TECHNOLOGY: A SET OF TOOLS FOR MONITORING REd CORAL IN MEdITERRANEAN SEA IN THE FRAMEWORK OF THE "PERFECT" PROJECT

UNDERWATER PHOTOGRAMMETRY, CODED TARGET AND PLENOPTIC TECHNO...

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conference on 3d virtual reconstruction and visualization of complex architectures

作者： drap, P. Royer, J. P. Nawaf, M. M. Saccone, M. Merad, d. Lopez-Sanz, A. Ledoux, J. B. Garrabou, J. Aix Marseille Univ Univ Toulon LSIS UMR 7296 CNRSENSAM Domaine Univ St JeromeBatiment Polytech F-13397 Marseille France CSIC Inst Ciencies Mar Barcelona Spain Aix Marseille Univ Univ Toulon Mediterranean Inst Oceanog MIO UM CNRS IRD 110 Campus Luminy OceanomedBatiment Mediterranee F-13288 Marseille 09 France

PErfECT 'Photogrammetry, gEnetic, Ecology for red coral ConservaTion' is a project leaded by the Laboratoire des Sciences de lInformation et des Systmes (LSIS - UMR 7296 CNRS) from the Aix-Marseille University (France) in collaboration with the Spanish National Agency for Scientific Research (CSIC, Spain). The main objective of the project is to develop innovative Tools for the conservation of the Mediterranean red coral, Corallium rubrum. PErfECT was funded by the Total Fundation. The adaptation of digital photogrammetric techniques for use in submarine is rapidly increasing in recent years. In fact, these techniques are particularly well suited for use in underwater environments. PErfECT developed different photogrammetry tools to enhance the red coral population surveys based in: (i) automatic orientation on coded quadrats, (ii) use of NPR (Non Photo realistic Rendering) techniques, (iii) the calculation of distances between colonies within local populations and finally (iv) the use of plenoptic approaches in underwater conditions.

关键词： Red coral Photogrammetry Orthophoto Plenoptic NPR

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Live Semantic 3d Perception for Immersive Augmented Reality

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IEEE TRANSACTIONS ON visualization ANd COMPUTER GRAPHICS 2020年第5期26卷 2012-2022页

作者： Han, Lei Zheng, Tian Zhu, Yinheng Xu, Lan Fang, Lu Tsinghua Univ Beijing Peoples R China Hong Kong Univ Sci & Technol Hong Kong Peoples R China

Semantic understanding of 3d environments is critical for both the unmanned system and the human involved virtual/augmented reality (VR/AR) immersive experience. Spatially-sparse convolution, taking advantage of the intrinsic sparsity of 3d point cloud data, makes high resolution 3d convolutional neural networks tractable with state-of-the-art results on 3d semantic segmentation problems. However, the exhaustive computations limits the practical usage of semantic 3d perception for VR/AR applications in portable devices. In this paper, we identify that the efficiency bottleneck lies in the unorganized memory access of the sparse convolution steps, i.e., the points are stored independently based on a predefined dictionary, which is inefficient due to the limited memory bandwidth of parallel computing devices (GPU). With the insight that points are continuous as 2d surfaces in 3d space, a chunk-based sparse convolution scheme is proposed to reuse the neighboring points within each spatially organized chunk. An efficient multi-layer adaptive fusion module is further proposed for employing the spatial consistency cue of 3d data to further reduce the computational burden. Quantitative experiments on public datasets demonstrate that our approach works 11x faster than previous approaches with competitive accuracy. By implementing both semantic and geometric 3d reconstruction simultaneously on a portable tablet device, we demo a foundation platform for immersive AR applications.

关键词： Three-dimensional displays Convolution Semantics Two dimensional displays Image segmentation Graphics processing units Solid modeling dense 3d reconstruction 3d Semantic Segmentation 3d Convolutional Network virtual Reality Augmented Reality

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SURVEY ANd virtual reconstruction OF ANCIENT ROMAN FLOORS IN AN ARCHAEOLOGICAL CONTEXT 2

SURVEY AND VIRTUAL RECONSTRUCTION OF ANCIENT ROMAN FLOORS IN...

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2nd International conference of Geomatics and Restoration (GEORES)

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

despite the consistent development of approaches aimed at the virtual reconstruction of whole houses or archaeological monuments, the variety of technologies involved in virtual reconstruction procedures and the complexity of a rigorous process to provide validation models, seems to limit a univocal and shared standards adoption. For example, compared to the large number of contributions on the virtual reconstruction of whole architectures or cultural heritage sites, only a few works have proposed a rigorous workflow specific to mosaics and ancient floors and to their virtual reconstruction. The goal of this work is to present the first results on the virtual reconstruction of the "Temple of Isis" in Marsala (Italy);in particular, the work is aimed at the virtual reconstruction of the mosaic and the opus spicatum floor still preserved in situ. A close-range photogrammetric survey was carried out in order to provide a detailed floors 3d reconstruction;a structure-from-motion photogrammetry approach was employed to obtain a detailed 2d and 3d documentation with millimetric accuracy and high level of colour fidelity. Thanks to the photogrammetric products, accurate virtual restoration/reconstruction of the whole floor surfaces was conducted in a rigorous way and as close as possible to the historical reality.

关键词： virtual reconstruction Archaeology 3d Model Close-range Photogrammetry Structure-from-Motion

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reconstruction and Editing of dynamic Flame Temperature Field 6

Reconstruction and Editing of Dynamic Flame Temperature Fiel...

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6th International conference on virtual Reality and visualization (ICVRV)

作者： Wu Zhaohui Wu Xiaobo Zhang Linbo Wang Feng China Acad Transportat Sci Beijing Peoples R China

ISBN: (纸本)9781509051885

Image-based 3d reconstruction is not only useful for reconstructing visually realistic 3d flames, but it also deepens our understanding of flame physical nature. In this paper, we focus on the capturing and reusing of 3d temperature fields. A novel method is proposed to reconstruct and edit 3d temperature filed for combustion flame. Firstly, a multi-view imaging system is designed to capture the color images of combustion flames. Secondly, the 3d temperature distributions are calculated by using irradiance attenuation calibration, tomographic reconstruction and two-color pyrometric techniques. Finally, a target temperature driven editing method is proposed to restore the dynamic information between the reconstructed temperature fields, and to control flame animation based on temperature field directly. The experimental results indicate that our approach performs well in temperature field capturing and reusing.

关键词： irradiance attenuation tomographic reconstruction target driven editing temperature measurement flame/fire

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Integration of Real-time 3d Capture, reconstruction and Light-field display 26

Integration of Real-time 3D Capture, Reconstruction and Ligh...

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conference on Stereoscopic displays and Applications XXVI

作者： Zhang, Zhaoxing Geng, Zheng Li, Tuotuo Pei, Renjing Liu, Yongchun Zhang, Xiao Chinese Acad Sci Inst Automat State Key Lab Management & Control Complex Syst Beijing 100190 Peoples R China Nanjing Univ Aeronaut & Astronaut Coll Automat Engn Nanjing 210016 Jiangsu Peoples R China Jiangsu Univ Zhenjiang 212013 Peoples R China

ISBN: (纸本)9781628414813

Effective integration of 3d acquisition, reconstruction (modeling) and display technologies into a seamless systems provides augmented experience of visualizing and analyzing real objects and scenes with realistic 3d sensation. Applications can be found in medical imaging, gaming, virtual or augmented reality and hybrid simulations. Although 3d acquisition, reconstruction, and display technologies have gained significant momentum in recent years, there seems a lack of attention on synergistically combining these components into a "end-to-end" 3d visualization system. We designed, built and tested an integrated 3d visualization system that is able to capture in real-time 3d light-field images, perform 3d reconstruction to build 3d model of the objects, and display the 3d model on a large autostereoscopic screen. In this article, we will present our system architecture and component designs, hardware/ software implementations, and experimental results. We will elaborate on our recent progress on sparse camera array light-field 3d acquisition, real-time dense 3d reconstruction, and autostereoscopic multi-view 3d display. A prototype is finally presented with test results to illustrate the effectiveness of our proposed integrated 3d visualization system.

关键词： 3d autostereoscopic 3d acquisition 3d reconstruction 3d display 3d imaging 3d visualization

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CULTURAL HERITAGE THROUGH TIME: A CASE STUdY AT HAdRIAN'S WALL, UNITEd KINGdOM

CULTURAL HERITAGE THROUGH TIME: A CASE STUDY AT HADRIAN'S WA...

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conference on 3d virtual reconstruction and visualization of complex architectures

作者： Fieber, K. d. Mills, J. P. Peppa, M. V. Haynes, I. Turner, S. Turner, A. douglas, M. Bryan, P. G. Newcastle Univ Sch Civil Engn & Geosci Newcastle Upon Tyne NE1 7RU Tyne & Wear England Newcastle Univ Sch Hist Class & Archaeol Newcastle Upon Tyne NE1 7RU Tyne & Wear England English Heritage York N Yorkshire England Hist England York N Yorkshire England

diachronic studies are central to cultural heritage research for the investigation of change, from landscape to architectural scales. Temporal analyses and multi-temporal 3d reconstruction are fundamental for maintaining and safeguarding all forms of cultural heritage. Such studies form the basis for any kind of decision regarding intervention on cultural heritage, helping assess the risks and issues involved. This article introduces a European-wide project, entitled "Cultural Heritage Through Time", and the case study research carried out as a component of the project in the UK. The paper outlines the initial stages of the case study of landscape change at three locations on Hadrian's Wall, namely Beckfoot Roman Fort, Birdoswald Roman Fort and Corbridge Roman Station, all once part of the Roman Empire's north-west frontier. The main aim of the case study is to integrate heterogeneous information derived from a range of sources to help inform understanding of temporal aspects of landscape change. In particular, the study sites are at risk from natural hazards, notably erosion and flooding. The paper focuses on data collection and collation aspects, including an extensive archive search and field survey, as well as the methodology and preliminary data processing.

关键词： 4d Modelling Cultural Heritage data Collection data Fusion Monitoring visualization

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EVALUATING THE STRUCTURAL INTEGRITY OF THE SAINT ANTONIO BARREL VAULT IN THE FORTRESS OF ALMEIdA BY COMBINING LASER SCANNER ANd LIMIT ANALYSIS 8

EVALUATING THE STRUCTURAL INTEGRITY OF THE SAINT ANTONIO BAR...

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

作者： Sanchez-Aparicio, L. J. Rodriguez-Gonzalvez, P. Gonzalez-Aguilera, d. Ramos, Luis F. Univ Salamanca Dept Cartog & Land Engn High Polytecn Sch Avila Avila Spain Univ Leon Dept Min Technol Topog & Struct Ponferrada Spain Univ Minho ISISE Dept Civil Engn Guimaraes Portugal

Under the framework of the modern theory of restoration, this paper shows the experimental results obtained during the structural diagnosis of one of the most important master gates inside the military modern complex of Almeida in Portugal: the inner master gate of Saint Antonio. This master gate was conceived with the aim of supporting the siege of an early modern army, using to this end a masonry framework filled by a natural soil able to absorb the impacts. However, this infill is promoting the disaggregation of the masonry and thus the reduction of its bearing capacity. In order to evaluate the current and future structural behaviour, it is proposed a method able to combine the terrestrial laser scanner with the limit analysis for masonry constructions. The results obtained by this combination shows that the major barrel vault has, in its current conservation state, enough bearing capacity to support an agglomeration of people. However, it is recommended a material restitution in order to recover the contact are between masonry blocks as well as to recover the architectural interpretation of the element.

关键词： Historical construction Trace Italienne fortress Masonry Laser scanner Structural diagnosis Limit Analysis

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THE INTEGRATION OF THE MULTI-TEMPORAL CONSERVATION WORKS ANd NON-INVASIVE MEASUREMENTS 9

THE INTEGRATION OF THE MULTI-TEMPORAL CONSERVATION WORKS AND...

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9th International Workshop on 3d-ARCH 3d virtual reconstruction and visualization of complex architectures

作者： Markiewicz, J. Gorecka, K. Zawieska, d. Zielinski, M. Lapinski, S. Kot, P. Warsaw Univ Technol Fac Geodesy & Cartog Pl Politech 1 PL-00661 Warsaw Poland Acad Fine Arts Warsaw Fac Conservat & Restorat Works Art Warsaw Poland Museum King Jan IIIs Palace Wilanow Documentat & Digitalizat Dept Wilanow Ul Stanislawa Kostki Potockiego 10-16 PL-02958 Warsaw Poland Liverpool John Moores Univ Built Environm & Sustainable Technol BEST Liverpool L3 3AF Merseyside England

Heritage sites are affected by many factors that cause degradation and decay over time, such as soil deformation, changes in weather conditions, or excess moisture, which can cause damages to historical sites. For this reason, restoration works are planned and carried out to preserve the object's existing condition, renovate and repair the damaged parts, or restore the original condition of the object. The Rescue Project was undertaken in the Blessed Ladislas' chapel in St. Anna's Church in Warsaw, Poland. The main goal of the planned work was to restore the original rococo character of the dome paintings. The aim of this article was to present the integration of the multi-temporal conservation work and non-invasive measurements for changes analysis during conservation works. For this purpose, point clouds acquired with a Z+F 5006h ground-based scanner and images captured via Structure-from-Motion and MultiView Stereo method implemented in Agisoft Metashape software were used. The proposed conservation analysis method was a multi-stage process that involved: (1) automatic data integration using a feature-based approach based on 2d detectors and point clouds converted to spherical images, (2) generalisation and harmonisation of source data, and (3) analysis of deviations between point clouds. Having registered point clouds with each other, it was possible to analyse changes that occurred during conservation work. Calculated distances between both point clouds show the localisation of cracks and damages and enable measure of the size and depth of crevices on the dome wall.

关键词： Conservation works multi-temporal data data integration SfM/MVS TLS

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dIGITAL reconstruction OF THE CHURCH OF SAN ILdEFONSO IN ZAMORA (SPAIN) USING ORTHOWARE 4

DIGITAL RECONSTRUCTION OF THE CHURCH OF SAN ILDEFONSO IN ZAM...

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

作者： Perez, A. Cachero, R. Navarro, S. Jorda, F. Lopez, d. Lerma, J. L. Martos, A. Metria Digital SL Llanera 33428 Asturias Spain Univ Politecn Valencia Dpto Ing Cartog Geodesia & Fotogrametria Valencia 46022 Spain Univ Oviedo Dept Informat Lab Vis Computador Gijon 33204 Spain

This paper describes the surveying process performed on the Church of San Ildefonso in Zamora (Spain) using Orthoware (c), an innovative photogrammetric software tool specially designed for the digital reconstruction of cultural heritage. This software is the result of intense R&d at Metria digital after several years producing heritage true orthoimages, plans and full color 3d models in a commercial environment. Orthoware allows true measurements and produces high quality true orthoimages and full color 3d models starting out from conventional digital photographs. This is a progressive tool designed for non-specialist users, providing intuitive and quick methods to visually diagnose the quality of the results. The Church of San Ildefonso in Zamora was built over a previously existing temple whose Romanesque construction dates back to the 11th century, although it is nowadays hidden among extensions and remodelings carried out up until 18th century. With a length of more than 30 meters, the original floor plan of the Church consists on three naves and three apses, although only one nave is visible now, covered by groin vault, and one semicircular apse partially hidden by the current building. The south front maintains the greater part of its Romanesque origins, in spite of being hidden and higher than the present ground level. At the feet of the temple a tower rises, whose first stage is Romanesque but which has been altered by numerous Baroque elements. The objective of the photogrammetric reconstruction was the integral survey of the monument, including its four facades, interior faces and roofs for the production of some true-orthoimages, cross-sections, longitudinal-sections and ground plans at scale 1/50 with an accuracy of 10 mm for the drawings and a pixel size below 10 mm for the synthetic imagery. The usual photogrammetric workflow for producing true-orthoimages and digital 3d models in cultural heritage depends to a great extent on finding and matching hom

关键词： reconstruction Orthoware photogrammetry orthophotograph digital three-dimensional model dense surface model true-orthoimage rectification documentation heritage

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MOdELLING BUILdING COSTS FROM 3d BUILdING MOdELS - ESTIMATING THE CONSTRUCTION EFFORT FROM IMAGE-BASEd SURFACE MOdELS OF dRY-STONE SHEPHERd SHELTERS (KRAS, SLOVENIA) 8

MODELLING BUILDING COSTS FROM 3D BUILDING MODELS - ESTIMATIN...

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

作者： Stuhec, S. Verhoeven, G. Stuhec, I. Univ Ljubljana Fac Arts Dept Archaeol Askerceva 2 Ljubljana 1000 Slovenia Ludwig Boltzmann Inst Archaeol Prospect & Virtual Franz Klein Gasse 1 A-1190 Vienna Austria Univ Ljubljana Fac Math & Phys Dept Phys Jadranska Ulica 19 Ljubljana Slovenia

In the second half of the 19th and early 20th century, sheep shepherds have built dry-stone shelters all over the Slovene Kras (or Karst) region. despite being made out of stones that are interlocked without the use of any binding material, many of these vernacular constructions survived - even though sometimes only partially - the ravages of time. The fact that over one hundred fifty shepherd shelters are currently known is mainly due to the craftsmanship of their builders and thanks to (and even despite) their present location. A majority of these stone constructions can be found in areas that are nowadays forested, thus shielding them from weather-related or anthropogenic damage (because they are difficult to spot). This paper reports on the geometric documentation of those shelters using a photogrammetric computer vision pipeline, thereby mainly focussing on the difficulties that were encountered during this process. However, such image-based modelling approaches merely yield digital three-dimensional (3d) approximations of the shelters' surface geometry (along with some sub-optimal colour data). Although these 3d surface models might be suitable to digitally preserve vulnerable vernacular buildings to some extent, they do not magically advance our understanding of them. The second part of this article focuses, therefore, on the extraction of archaeological information from these digital 3d constructions. More specifically, the total amount of stones, the total building time and the building cost regarding caloric energy expenditure are estimated for each of the digitised shelters. Although this assessment of architectural energetics provided useful insight into the building efforts and nutrient uptake of the shepherds, it also revealed many assumptions and shortcomings that often characterise archaeological information extraction from digital 3d models of buildings.

关键词： Architectural energetics Biomechanics Caloric expenditure dry-stone building Image-based modelling Slovenia

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