Indoor reconstruction is important in location based service with the development of web Geographic Information System (GIS). 3dvisualizationvirtual navigation in indoor scene is high demanded in the internet. due t...
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ISBN:
(纸本)9781538637555
Indoor reconstruction is important in location based service with the development of web Geographic Information System (GIS). 3dvisualizationvirtual navigation in indoor scene is high demanded in the internet. due to lack of texture, active range is used for location and mapping, such as structure of light and time of flight. Laser scanner is more accurate for large scale indoor mapping. A backpack or trolley mounted laser scanners and cameras are widely used in indoor mapping. Point cloud of laser scanner is mainly used to location. Camera images are used to make panoramic images. In a large scale environment, the point cloud and images are a large dataset to be shown. Indoor reconstruction can reduce the dataset in the web. This paper presents an automatic pipeline of indoor reconstruction for the dataset captured by Navvis M3 trolley. Firstly, Poisson reconstruction is used to generate the triangle mesh from the point cloud. Secondly, the mesh is partitioned into several blocks using the building principal direction to improve the efficiency, and then the mesh is simplified using plane segmentation based method. At last, a ray intersection based method is used to select the corresponding images to the mesh, and then texture atlas is generated. Experiment shows that, the pipeline can automatic get the indoor reconstruction mesh with texture. The result reduces the data size sharply, and is also convenient to be shown on the web.
The excavated architecture of the exceptional prehistoric site of Akrotiri on the Greek island of Thera/Santorini is endangered by gradual decay, damage due to accidents, and seismic shocks, being located on an active...
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The excavated architecture of the exceptional prehistoric site of Akrotiri on the Greek island of Thera/Santorini is endangered by gradual decay, damage due to accidents, and seismic shocks, being located on an active volcano in an earthquake-prone area. Therefore, in 2013 and 2014 a digital documentation project has been conducted with support of the National Geographic Society in order to generate a detaileddigital model of Akrotiri's architecture using terrestrial laser scanning and image-based modeling. Additionally, non-invasive geophysical prospection has been tested in order to investigate its potential to explore and map yet buried archaeological remains. This article describes the project and the generated results.
Extended Reality (xR) encapsulates various computer-altered reality technologies that cover virtual reality (VR), augmented reality (AR), and mixed reality (MR). xR is a technology that merges a virtual element into t...
Extended Reality (xR) encapsulates various computer-altered reality technologies that cover virtual reality (VR), augmented reality (AR), and mixed reality (MR). xR is a technology that merges a virtual element into the real-world with the aims to enhance reality on the virtual world immerse onto real-world space. xR has been improved from time to time as the advanced immersive technologies to extend the reality we experience by either combining the virtual and real worlds or by generating a fully immersive experience. Remote collaboration in xR is a challenge since both parties need to have the same system and to set to parallel to xR environments. In a collaborative interface context, the user can be in a remote collaboration or face-to-face to sense the immersive environment. Human teleportation is transferring a human from a local location to a remote location, where the reconstruction of a human appears in a realistic visual representation. However, creating a fully realistic representation of the human figure need a complex3dreconstruction method. Therefore, the paper describes the human teleportation in the xR environment using the advanced RGB-d sensor devices. It explains the phases to develop the real human teleportation in xR. The paper also discusses the proposed collaborative xR system that has successfully actualized the user teleportation.
This paper aims to illustrate the preliminary results of a research project on the dome of Pisa Cathedral (Italy). The final objective of the present research is to achieve a deep understanding of the structural behav...
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This paper aims to illustrate the preliminary results of a research project on the dome of Pisa Cathedral (Italy). The final objective of the present research is to achieve a deep understanding of the structural behaviour of the dome, through a detailed knowledge of its geometry and constituent materials, and by taking into account historical and architectural aspects as well. A reliable survey of the dome is the essential starting point for any further investigation and adequate structural modelling. Examination of the status quo on the surveys of the Cathedral dome shows that a detailed survey suitable for structural analysis is in fact lacking. For this reason, high-density and high-precision surveys have been planned, by considering that a different survey output is needed, according both to the type of structural model chosen and purposes to be achieved. Thus, both range-based (laser scanning) and image-based (3d Photogrammetry) survey methodologies have been used. This contribution introduces the first results concerning the shape of the dome derived from surveys. Furthermore, a comparison is made between such survey outputs and those available in the literature.
In recent decades, computer vision has been a hot area of computer research while 3dreconstruction is one of the hot topics. With the improvement of 3dreconstruction theory and the rapiddevelopment of computer hard...
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ISBN:
(纸本)9781538684986;9781538684979
In recent decades, computer vision has been a hot area of computer research while 3dreconstruction is one of the hot topics. With the improvement of 3dreconstruction theory and the rapiddevelopment of computer hardware technology, the reconstructed3d models are enlarging in scale and increasing in complexity. Combining the aerial image of UAV with the 3dreconstruction of sequence images, it is of great value to carry out relevant research on the problem of 3dreconstruction of outdoor scenes. The fast rendering of these large-scale scene models is a challenge. At the same time, with the advancement of the HMTL5 specification, browsers have become more and more powerful, and WebGL has gradually gained support from more and more devices. The 3d rendering of the BS architecture will be the future direction of the rendering engine. The browser does not need to install the client program, which is convenient for users to access and process in any environment. Therefore, the large-scale scene display system based on web architecture is more convenient. In this paper, we designed a real-time display system for large-scale scenes, and studied WebGL based rendering frame techniques.
during the last two decades we have witnessed great improvements in ICT hardware and software technologies. Three-dimensional content is starting to become commonplace now in many applications. Although for many years...
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during the last two decades we have witnessed great improvements in ICT hardware and software technologies. Three-dimensional content is starting to become commonplace now in many applications. Although for many years 3d technologies have been used in the generation of assets by researchers and experts, nowadays these tools are starting to become commercially available to every citizen. This is especially the case for smartphones, that are powerful enough and sufficiently widespread to perform a huge variety of activities (e.g. paying, calling, communication, photography, navigation, localization, etc.), including just very recently the possibility of running 3dreconstruction pipelines. The REPLICATE project is tackling this particular issue, and it has an ambitious vision to enable ubiquitous 3d creativity via the development of tools for mobile 3d-assets generation on smartphones/tablets. This article presents the REPLICATE project's concept and some of the ongoing activities, with particular attention being paid to advances made in the first year of work. Thus the article focuses on the system architecture definition, selection of optimal frames for 3d cloudreconstruction, automated generation of sparse anddense point clouds, mesh modelling techniques and post-processing actions. Experiments so far were concentrated on indoor objects and some simple heritage artefacts, however, in the long term we will be targeting a larger variety of scenarios and communities.
This work is based on the campus of Tianjin University of Technology. It uses 3dreconstruction technology to build its 3dvirtual scene. Then, use the Unreal Engine Unreal Engine to use blueprints, mixed spaces, anim...
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ISBN:
(纸本)9781538684986;9781538684979
This work is based on the campus of Tianjin University of Technology. It uses 3dreconstruction technology to build its 3dvirtual scene. Then, use the Unreal Engine Unreal Engine to use blueprints, mixed spaces, animation montages, etc. to realize the three roaming modes of characters, vehicles and helicopters. Allowing visitors to experience the roaming campus realized by virtual reality technology. Promote campus culture in a unique way and increase campus awareness.
Archaeology is by its nature strictly connected with the physical landscape and as such it explores the inter-relations of individuals with places in which they leave and the nature that surrounds them. Since its earl...
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Archaeology is by its nature strictly connected with the physical landscape and as such it explores the inter-relations of individuals with places in which they leave and the nature that surrounds them. Since its earliest stages, archaeology demonstrated its permeability to scientific methods and innovative techniques or technologies. Archaeologists were indeed between the first to adopt GIS platforms (since already almost three decades) on large scale and are now between the most demanding customers for emerging technologies such as digital photogrammetry anddrone-aided aerial photography. This paper aims at presenting case studies where the "3d approach" can be critically analysed and compared with more traditional means of documentation. Spot-light is directed towards the benefits of a specifically designed platform for user to access the 3d point-clouds and explore their characteristics. Beside simple measuring and editing tools, models are presented in their actual context and location, with historical and archaeological information provided on the side. As final step of a parallel project on geo-referencing and making available a large archive of aerial photographs, 3d models derived from photogrammetric processing of images have been uploaded and linked to photo-footprints polygons. Of great importance in such context is the possibility to interchange the point-cloud colours with satellite imagery from OpenLayers. This approach makes it possible to explore different landscape configurations due to time-changes with simple clicks. In these cases, photogrammetry or 3d laser scanning replaced, sided or integrated legacy documentation, creating at once a new set of information for forthcoming research and ideally new discoveries.
Visibility computing is a basic problem in computer graphics, and is often the bottleneck in realistic rendering algorithms. Some of the most common include the determination of the objects visible from a viewpoint, v...
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ISBN:
(纸本)9783030050511;9783030050504
Visibility computing is a basic problem in computer graphics, and is often the bottleneck in realistic rendering algorithms. Some of the most common include the determination of the objects visible from a viewpoint, virtual reality, real-time simulation and3d interactive design. As one technique to accelerate the rendering speed, the research on visibility computing has gained great attention in recent years. Traditional visibility computing on single processor machine has been unable to meet more and more large-scale andcomplex scenes due to lack parallelism. However, it will face many challenges to design parallel algorithms on a cluster due to imbalance workload among compute nodes, the complicated mathematical model anddifferent domain knowledge. In this paper, we propose an efficient and highly scalable framework for visibility computing on Tianhe-2 supercomputer. Firstly, a new technique called hemispheric visibility computing is designed, which can overcome the visibility missing of traditional perspective algorithm. Secondly, a distributed parallel algorithm for visibility computing is implemented, which is based on the master-worker architecture. Finally, we discuss the issue of granularity of visibility computing and some optimization strategies for improving overall performance. Experiments on Tianhe-2 supercomputer show that our distributed parallel visibility computing framework almost reaches linear speedup by using up to 7680 CPU cores.
The research illustrated in this article aimed at identifying a good standard methodology to survey very narrow spaces during 3d investigation of Cultural Heritage. It is an important topic in today's era of BIM m...
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The research illustrated in this article aimed at identifying a good standard methodology to survey very narrow spaces during 3d investigation of Cultural Heritage. It is an important topic in today's era of BIM modelling applied to Cultural Heritage. Spaces like staircases, corridors and passages are very common in the architectural or archaeological fields, and obtaining a 3d-oriented survey of those areas can be a very complex task when completeness of the model and high precision are requested. Photogrammetry appears to be the most promising solution in terms of versatility and manoeuvrability also considering the quality of the requireddata. Fisheye lenses were studied and tested in depth because of their significant advantage in the field of view if compared with rectilinear lenses. This advantage alone can be crucial to reduce the total amount of photos and, as a consequence, to obtain manageable data, to simplify the survey phase and to significantly reduce the elaboration time. In order to overcome the main issue that arise when using fisheye lenses, which is the lack of rules that can be employed to design the survey, a general mathematical formulation to precisely estimate the GSd (Ground Sampling distance) for every optical projection is presented here. A complete survey of a real complex case study was performed in order to test and stress the proposed methodology, and to handle a fisheye-based survey from beginning to end: the photogrammetric survey of the Minguzzi Staircase. It is a complex service spiralstaircase located in the duomo di Milano with a total height of 25 meters and characterized by a narrow walkable space about 70 centimetres wide.
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