Laser Scanner technology become an option in the process of collecting data nowadays. It is composed of Airborne Laser Scanner (ALS) and Terrestrial Laser Scanner (TLS). ALS like Phoenix AL3-32 can provide accurate in...
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Laser Scanner technology become an option in the process of collecting data nowadays. It is composed of Airborne Laser Scanner (ALS) and Terrestrial Laser Scanner (TLS). ALS like Phoenix AL3-32 can provide accurate information from the viewpoint of rooftop while TLS as Leica C10 can provide complete data for building facade. However if both are integrated, it is able to produce more accurate data. The focus of this study is to integrate both types of data acquisition of ALS and TLS anddetermine the accuracy of the data obtained. The final results acquired will be used to generate models of three-dimensional (3d) buildings. The scope of this study is focusing on data acquisition of UTM Eco-home through laser scanning methods such as ALS which scanning on the roof and the TLS which scanning on building facade. Both device is used to ensure that no part of the building that are not scanned. In data integration process, both are registered by the selected points among the manmade features which are clearly visible in Cyclone 7.3 software. The accuracy of integrateddata is determined based on the accuracy assessment which is carried out using man-made registration methods. The result of integration process can achieve below 0.04m. This integrateddata then are used to generate a 3d model of UTM Eco-home building using SketchUp software. In conclusion, the combination of the data acquisition integration between ALS and TLS would produce the accurate integrateddata and able to use for generate a 3d model of UTM eco-home. For visualization purposes, the 3d building model which generated is prepared in Level of detail 3 (LOd3) which recommended by City Geographic Mark-Up Language (CityGML).
Temporal analyses and multi-temporal 3dreconstruction are fundamental for the preservation and maintenance of all forms of Cultural Heritage (CH) and are the basis for decisions related to interventions and promotion...
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Temporal analyses and multi-temporal 3dreconstruction are fundamental for the preservation and maintenance of all forms of Cultural Heritage (CH) and are the basis for decisions related to interventions and promotion. Introducing the fourth dimension of time into three-dimensional geometric modelling of real data allows the creation of a multi-temporal representation of a site. In this way, scholars from various disciplines (surveyors, geologists, archaeologists, architects, philologists, etc.) are provided with a new set of tools and working methods to support the study of the evolution of heritage sites, both to develop hypotheses about the past and to model likely future developments. The capacity to "see" the dynamic evolution of CH assets across different spatial scales (e.g. building, site, city or territory) compressed in diachronic model, affords the possibility to better understand the present status of CH according to its history. However, there are numerous challenges in order to carry out 4d modelling and the requisite multi-data source integration. It is necessary to identify the specifications, needs and requirements of the CH community to understand the required levels of 4d model information. In this way, it is possible to determine the optimum material and technologies to be utilised at different CH scales, as well as the data management andvisualization requirements. This manuscript aims to provide a comprehensive approach for CH time-varying representations, analysis andvisualization across different working scales and environments: rural landscape, urban landscape and architectural scales. Within this aim, the different available metric data sources are systemized and evaluated in terms of their suitability.
As the scene of multi-view reconstruction becomes larger, a single machine can no longer satisfy the refinement of 3d mesh in large scenes including mesh simplification, subdivision, smoothness and recovering meaningf...
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ISBN:
(纸本)9781538684986;9781538684979
As the scene of multi-view reconstruction becomes larger, a single machine can no longer satisfy the refinement of 3d mesh in large scenes including mesh simplification, subdivision, smoothness and recovering meaningful details. In this paper, We propose a distributed method to refine a large-scale 3d mesh for accurate multiview reconstruction. First, we divide the initial mesh into blocks directly, which can utilize computing power of each computer. And then we make simplification and subdivision on those blocks, which can reduce mesh's noise and remove redundant vertices, so as to generate a high quality mesh where the difference of the size of each edge is not too large. Next, we propose to split a graph consisting of multiple images in order to minimize the overlapped image data in each block. Finally, we use distributed variational surface refinement algorithm to capture meaningful details of mesh. The experiments on both public large scale data-sets and our very large scale aerial photo sets demonstrate that the proposeddistributed method is fast and robust, and is suitable for all kinds of large scene areas.
The Basilica of San Marco is a singular case in the field of Cultural heritage, as it constitutes a construction site always active for the maintenance and preservation of the basilica itself. The continuous intervent...
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The Basilica of San Marco is a singular case in the field of Cultural heritage, as it constitutes a construction site always active for the maintenance and preservation of the basilica itself. The continuous intervention of conservation, due to the particular environmental conditions of Venice and the opening to the public, together with the complexity of the building itself, imposes the need to identify an optimized management system. For this reason, in 2013 the Procurator of St. Marco Basilica commissioned the construction of a 3d model of the Basilica to be used for the creation of a BIM. The model must meet the required precision of the scale of 1:50, and should also include, in addition to the geometric description, a description of the mosaic and marble surfaces of the basilica through high resolution orthophoto which are essential for the restoration of the mosaics. The complexity of the church and the large and continuous flow of public led to work in non-optimal conditions especially for the acquisition stage. The basilica has certain peculiarities that led to some important choices, for example the use of photogrammetry instead of laser scanning technique. The same technique was preferred also by the need to realize, in addition to the geometric model, high-resolution orthophotos of marbles and mosaic surfaces. The modelling of the basilica has highlighted a number of problems related to the building features. The basilica, indeed, is the result of the juxtaposition of elements (capitals, columns) with different origin, which therefore cannot be standardized in special libraries. Moreover, especially in the extensive mosaic areas, there are not edges that characterize the architecture, but only beveled surfaces. This has resulted in a change also in the modeling paradigm with the need to identify alternative systems even for the construction of simple elements. Therefore, we decided to model using NURBS since it is the method that allows greater adherence
A photogrammetric survey of a unique archaeological site is reported in this paper. The survey was performed using both a panoramic image-based solution and by classical procedure. The panoramic image-based solution w...
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A photogrammetric survey of a unique archaeological site is reported in this paper. The survey was performed using both a panoramic image-based solution and by classical procedure. The panoramic image-based solution was carried out employing a commercial solution: the Trimble V10 Imaging Rover (IR). Such instrument is an integrated cameras system that captures 360 degrees digital panoramas, composed of 12 images, with a single push. The direct comparison of the point clouds obtained with traditional photogrammetric procedure and V10 stations, using the same GCP coordinates has been carried out in Cloud Compare, open source software that can provide the comparison between two point clouds supplied by all the main statistical data. The site is a portion of the dial plate of the "Horologium Augusti" inaugurated in 9 B.C.E. in the area of Campo Marzio and still present intact in the same position, in a cellar of a building in Rome, around 7 meter below the present ground level.
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...
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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 developeddifferent 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.
diachronic studies are central to cultural heritage research for the investigation of change, from landscape to architectural scales. Temporal analyses and multi-temporal 3dreconstruction are fundamental for maintain...
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diachronic studies are central to cultural heritage research for the investigation of change, from landscape to architectural scales. Temporal analyses and multi-temporal 3dreconstruction 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.
In positron emission tomography (PET), decreasing patient injected radiation dose or scan time leads to a reduction in acquisition counts and noisy reconstructed images. Approaches such as post-smoothing (PS) and tota...
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ISBN:
(数字)9781728141640
ISBN:
(纸本)9781728141657
In positron emission tomography (PET), decreasing patient injected radiation dose or scan time leads to a reduction in acquisition counts and noisy reconstructed images. Approaches such as post-smoothing (PS) and total variation (TV) denoising can help reduce noise at the cost of resolution or bias, respectively. However, recent advances in convolutional neural networks (CNNs) have lead to promising results in low count PET. Some of these can take advantage of jointly acquireddata from other modalities such as magnetic resonance (MR) imaging. However, there are many considerations when designing an architecture depending on the specific task anddata available. This work compares some of the current state-of-the-art approaches. Results demonstrate that more powerful, complex networks do not necessarily yield better performance. Normalised root mean squared error (NRMSE) is decreased by 85.5% compared to standard maximum likelihood expectation maximisation (MLEM) PET reconstruction by using a 3-layer micro-network on very low (3.01M) count simulation data. This compares to reductions of 80.2% and 85.3% when total variation (TV) edge enhancement and an adversarial discriminator are incorporated into the loss function, respectively. Using both TV and a discriminator term produces a slightly better whole-brain NRMSE reduction of 86.0%, though with a risk of false positive lesions. This indicates that more investigation is required to determine general rules for choosing architectures and hyperparameters for low count PET.
We achieve the virtualreconstruction of tomb of LiChongrun who is the Prince of Tang dynasty andvirtual restoration of the frescoes in the tomb by the technology of computer vision andvirtual reality. Our goal is t...
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ISBN:
(纸本)9781538684986;9781538684979
We achieve the virtualreconstruction of tomb of LiChongrun who is the Prince of Tang dynasty andvirtual restoration of the frescoes in the tomb by the technology of computer vision andvirtual reality. Our goal is to solve the problem of Prince Yide tomb's structure recovery and falling mural restoration, and improve the efficiency and effect of digital protection of cultural sites. We utilize high-precision photography, digital scanning and3d model reconstruction to provide complete image information for the tombs. Combining sensory interaction, virtual roaming, image animation and other technologies to enhance the performance in virtual space, we let users have fully immersive experience and offer users a platform to learn the tombs of Tang dynasty and enjoy the beauty of tomb mural. By this means, we can maximize the recording anddissemination of precious historical and cultural information contained in the cultural heritage itself.
We present Yea Big, Yea High - a 3d user interface for surface selection in virtual environments. The interface extends previous selection interfaces that support exploratory visualization and3d modeling. While these...
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ISBN:
(纸本)9781538633663
We present Yea Big, Yea High - a 3d user interface for surface selection in virtual environments. The interface extends previous selection interfaces that support exploratory visualization and3d modeling. While these systems primarily focus on selecting single objects, Yea Big, Yea High allows users to select part of a surface mesh, a common task for data analysis, model editing, or annotation. The selection can be progressively refined by physically indicating a region of interest between a user's hands. We describe the design of the interface and key challenges we encountered. We present findings from a case study exploring design choices and use of the system.
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