scholarly journals Two New Ways of Documenting Miniature Incisions Using a Combination of Image-Based Modelling and Reflectance Transformation Imaging

2020 ◽  
Vol 12 (10) ◽  
pp. 1626 ◽  
Author(s):  
Dag-Øyvind E. Solem ◽  
Erich Nau
Keyword(s):  
Cost Efficiency ◽  
Laser Scanning ◽  
Accuracy Assessment ◽  
3D Models ◽  
Significant Degree ◽  
Software Packages ◽  
Efficiency Cost ◽  
3D Documentation ◽  
3D Processing ◽  
Reflectance Transformation Imaging

Digital 3D documentation methods such as Image-Based Modelling (IBM) and laser scanning have become increasingly popular for the recording of entire archaeological sites and landscapes, excavations and single finds during the last decade. However, they have not been applied in any significant degree to miniature incisions such as graffiti. In the same period, Reflectance Transformation Imaging (RTI) has become one of the most popular methods used to record and visualize this kind of heritage, though it lacks the benefits of 3D documentation. The aim of this paper is to introduce two new ways of combining IBM and RTI, and to assess these different techniques in relation to factors such as usability, time-efficiency, cost-efficiency and accuracy. A secondary aim is to examine the influence of two different 3D processing software packages on these factors: The widely used MetaShape (MS) and a more expensive option, RealityCapture (RC). The article shows that there is currently no recording technique that is optimal regarding all four aforementioned factors, and the way to record and produce results must be chosen based on a prioritization of these. However, we argue that the techniques combining RTI and IBM might be the overall best ways to record miniature incisions. One of these combinations is time-efficient and relatively cost-efficient, and the results have high usability even though the 3D models generated have low accuracy. The other combination has low time- and cost-efficiency but generates the most detailed 3D models of the techniques tested. In addition to cost-efficiency, the main difference between the 3D software packages tested is that RC is much faster than MS. The accuracy assessment remains inconclusive; while RC generally produces more detailed 3D models than MS, there are also areas of these models where RC creates more noise than MS.

scholarly journals GENERATION AND COMPARISON OF TLS AND SFM BASED 3D MODELS OF SOLID SHAPES IN HYDROMECHANIC RESEARCH

2016 ◽  
Vol XLI-B5 ◽  
pp. 925-929
Author(s):  
R. Zhang ◽  
D. Schneider ◽  
B. Strauß
Keyword(s):  
Point Cloud ◽  
Laser Scanning ◽  
3D Model ◽  
Accuracy Assessment ◽  
3D Models ◽  
3D Point Cloud ◽  
Synthetic Material ◽  
Qualitative Comparison ◽  
Software Packages ◽  
Main Influence

The aim of a current study at the Institute of Hydraulic Engineering and Technical Hydromechanics at TU Dresden is to develop a new injection method for quick and economic sealing of dikes or dike bodies, based on a new synthetic material. To validate the technique, an artificial part of a sand dike was built in an experimental hall. The synthetic material was injected, which afterwards spreads in the inside of the dike. After the material was fully solidified, the surrounding sand was removed with an excavator. In this paper, two methods, which applied terrestrial laser scanning (TLS) and structure from motion (SfM) respectively, for the acquisition of a 3D point cloud of the remaining shapes are described and compared. Combining with advanced software packages, a triangulated 3D model was generated and subsequently the volume of vertical sections of the shape were calculated. As the calculation of the volume revealed differences between the TLS and the SfM 3D model, a thorough qualitative comparison of the two models will be presented as well as a detailed accuracy assessment. The main influence of the accuracy is caused by generalisation in case of gaps due to occlusions in the 3D point cloud. Therefore, improvements for the data acquisition with TLS and SfM for such kind of objects are suggested in the paper.

scholarly journals GENERATION AND COMPARISON OF TLS AND SFM BASED 3D MODELS OF SOLID SHAPES IN HYDROMECHANIC RESEARCH

2016 ◽  
Vol XLI-B5 ◽  
pp. 925-929 ◽  
Author(s):  
R. Zhang ◽  
D. Schneider ◽  
B. Strauß
Keyword(s):  
Point Cloud ◽  
Laser Scanning ◽  
3D Model ◽  
Accuracy Assessment ◽  
3D Models ◽  
3D Point Cloud ◽  
Synthetic Material ◽  
Qualitative Comparison ◽  
Software Packages ◽  
Main Influence

The aim of a current study at the Institute of Hydraulic Engineering and Technical Hydromechanics at TU Dresden is to develop a new injection method for quick and economic sealing of dikes or dike bodies, based on a new synthetic material. To validate the technique, an artificial part of a sand dike was built in an experimental hall. The synthetic material was injected, which afterwards spreads in the inside of the dike. After the material was fully solidified, the surrounding sand was removed with an excavator. In this paper, two methods, which applied terrestrial laser scanning (TLS) and structure from motion (SfM) respectively, for the acquisition of a 3D point cloud of the remaining shapes are described and compared. Combining with advanced software packages, a triangulated 3D model was generated and subsequently the volume of vertical sections of the shape were calculated. As the calculation of the volume revealed differences between the TLS and the SfM 3D model, a thorough qualitative comparison of the two models will be presented as well as a detailed accuracy assessment. The main influence of the accuracy is caused by generalisation in case of gaps due to occlusions in the 3D point cloud. Therefore, improvements for the data acquisition with TLS and SfM for such kind of objects are suggested in the paper.

scholarly journals INTEGRATION OF SURVEYING TECHNIQUES TO DETECT THE IDEAL SHAPE OF A DOME: THE CASE OF THE ESCUELAS PÍAS CHURCH IN VALENCIA

2019 ◽  
Vol XLII-2/W9 ◽  
pp. 39-43
Author(s):  
S. Artese ◽  
J. L. Lerma ◽  
J. Aznar Molla ◽  
R. M. Sánchez ◽  
R. Zinno
Keyword(s):  
Laser Scanning ◽  
3D Model ◽  
Three Dimensional ◽  
Historical Building ◽  
Software Packages ◽  
Similarities And Differences ◽  
3D Documentation ◽  
Almost All ◽  
The Church ◽  
The Ideal

<p><strong>Abstract.</strong> The three-dimensional (3D) documentation and surveying of cultural heritage can be carried out following several geomatics techniques such as laser scanning and thermography in order to detect the original 3D shape after applying reverse engineering solutions. In almost all cases, the integration of data collected by different instruments is needed to achieve a successful and comprehensive 3D model of the as-built architectural shape of the historical building. This paper describes the operations carried out by the authors to determine the as-built 3D model of the Escuelas Pias Church, related namely to the dome and circular nave. After the description of the church and historical notes, attention will be driven to the indirect registration results obtained with three different laser scanning software packages, highlighting similarities and differences, and the consequences while generating meshes. The 3D model carried out will then be described and the results of some investigations with regard to the hypotheses about the design of the dome and the origin of the alterations will be presented.</p>

scholarly journals Creation of virtual 3D models of the existing architectonic structures using the web resources

Spatium ◽  
2016 ◽  
pp. 30-36 ◽  
Author(s):  
Petar Pejic ◽  
Sonja Krasic
Keyword(s):  
Laser Scanning ◽  
Three Dimensional ◽  
3D Models ◽  
Three Dimensional Model ◽  
Web Resources ◽  
Existing Structures ◽  
Software Packages ◽  
Physical Presence ◽  
The Creation ◽  
Three Dimensional Models

Digital three-dimensional models of the existing architectonic structures are created for the purpose of digitalization of the archive documents, presentation of buildings or an urban entity or for conducting various analyses and tests. Traditional methods for the creation of 3D models of the existing buildings assume manual measuring of their dimensions, using the photogrammetry method or laser scanning. Such approaches require considerable time spent in data acquisition or application of specific instruments and equipment. The goal of this paper is presentation of the procedure for the creation of 3D models of the existing structures using the globally available web resources and free software packages on standard PCs. This shortens the time of the production of a digital three-dimensional model of the structure considerably and excludes the physical presence at the location. In addition, precision of this method was tested and compared with the results acquired in a previous research.

scholarly journals ACCURACY ASSESSMENT OF 3D MODELS GENERATED FROM GOOGLE STREET VIEW IMAGERY

2019 ◽  
Vol XLII-2/W9 ◽  
pp. 181-188 ◽  
Author(s):  
N. Bruno ◽  
R. Roncella
Keyword(s):  
Accuracy Assessment ◽  
Average Distance ◽  
3D Models ◽  
Google Earth ◽  
Google Street View ◽  
3D City Model ◽  
Software Packages ◽  
Street View ◽  
Panoramic Images ◽  
City Model

<p><strong>Abstract.</strong> Google Street View is a technology implemented in several Google services/applications (e.g. Google Maps, Google Earth) which provides the user, interested in viewing a particular location on the map, with panoramic images (represented in equi-rectangular projection) at street level. Generally, consecutive panoramas are acquired with an average distance of 5&amp;ndash;10<span class="thinspace"></span>m and can be compared to a traditional photogrammetric strip and, thus, processed to reconstruct portion of city at nearly zero cost. Most of the photogrammetric software packages available today implement spherical camera models and can directly process images in equi-rectangular projection. Although many authors provided in the past relevant works that involved the use of Google Street View imagery, mainly for 3D city model reconstruction, very few references can be found about the actual accuracy that can be obtained with such data. The goal of the present work is to present preliminary tests (at time of writing just three case studies has been analysed) about the accuracy and reliability of the 3D models obtained from Google Street View panoramas.</p>

scholarly journals 3D MODELS OF THE QH31, QH32 AND QH33 TOMBS IN QUBBET EL HAWA (ASWAN, EGYPT)

2020 ◽  
Vol XLIII-B2-2020 ◽  
pp. 1427-1434
Author(s):  
A. T. Mozas-Calvache ◽  
J. L. Pérez-García ◽  
J. M. Gómez-López ◽  
J. L. Martínez de Dios ◽  
A. Jiménez-Serrano
Keyword(s):  
Laser Scanning ◽  
3D Model ◽  
Terrestrial Laser Scanning ◽  
3D Models ◽  
Complex Geometries ◽  
Spatial Behaviour ◽  
Reduced Dimensions ◽  
Adjacent Structures ◽  
Close Range ◽  
3D Documentation

Abstract. This paper describes the methodology employed to obtain 3D models of three funerary complexes (QH31, QH32 and QH33) of the Necropolis of Qubbet el Hawa (Aswan, Egypt) and the main results obtained. These rock-cut tombs are adjacent structures defined by complex geometries such as chambers, corridors and vertical shafts. The main goal of this study was to discover the spatial relationships between them and obtain a complete 3D model. In addition, some models with realistic textures of the burial chambers were demanded in order to analyse archaeological, architectural and geological aspects. The methodology was based on the use of Terrestrial Laser Scanning and Close Range Photogrammetry. In general, both techniques were developed in parallel for each tomb. Some elements presented difficulties because of their reduced dimensions, the presence of vertical falls, some objects stored in the tombs that generated occlusions of some walls, coincidence of other workers, poor illumination conditions, etc. The results included three complete 3D models obtained without texture and some parts of interest obtained with real textures. All models were merged into a global 3D model. The information extracted from this product has helped architects and archaeologists to contrast their premises about the spatial behaviour of the tombs. The results have also allowed the obtaining of the first 3D documentation of these tombs under the same reference system, allowing them to be studied completely. This information is very important for documentation purposes but also to understand the spatial behaviour of these structures and the excavation processes developed by ancient Egyptians 4000 years ago.

scholarly journals HIGH-QUALITY 3D MODELS AND THEIR USE IN A CULTURAL HERITAGE CONSERVATION PROJECT

2017 ◽  
Vol XLII-2/W5 ◽  
pp. 687-693 ◽  
Author(s):  
G. Tucci ◽  
V. Bonora ◽  
A. Conti ◽  
L. Fiorini
Keyword(s):  
Cultural Heritage ◽  
Laser Scanning ◽  
Three Dimensional ◽  
3D Models ◽  
Heritage Conservation ◽  
Work Support ◽  
Cultural Heritage Conservation ◽  
3D Data ◽  
Restoration Work ◽  
3D Documentation

Cultural heritage digitization and 3D modelling processes are mainly based on laser scanning and digital photogrammetry techniques to produce complete, detailed and photorealistic three-dimensional surveys: geometric as well as chromatic aspects, in turn testimony of materials, work techniques, state of preservation, etc., are documented using digitization processes.<br><br> The paper explores the topic of 3D documentation for conservation purposes; it analyses how geomatics contributes in different steps of a restoration process and it presents an overview of different uses of 3D models for the conservation and enhancement of the cultural heritage. The paper reports on the project to digitize the earthenware frieze of the Ospedale del Ceppo in Pistoia (Italy) for 3D documentation, restoration work support, and digital and physical reconstruction and integration purposes. The intent to design an exhibition area suggests new ways to take advantage of 3D data originally acquired for documentation and scientific purposes.

scholarly journals Documentación 3D y visualización multimedia de la Cova del Parpalló (Gandia)

2010 ◽  
Vol 1 (2) ◽  
pp. 123 ◽  
Author(s):  
José Luis Lerma García ◽  
Miriam Cabrelles López ◽  
Santiago Navarro Tarín ◽  
Sergio Galcerá Ustero
Keyword(s):  
Cultural Heritage ◽  
Laser Scanning ◽  
Three Dimensional ◽  
3D Models ◽  
The Other ◽  
Its Analysis ◽  
3D Documentation ◽  
The One ◽  
The Right ◽  
Cultural Heritage Objects

<p>The three-dimensional (3D) documentation by means of laser scanning and photogrammetry eases exhaustive recording, the right lecture of cultural heritage objects and its analysis in order to, on the one hand, adopt appropriate decisions and interventions, on the other hand, move forward the generation of virtual animated replicas of great value and smooth multimedia dissemination. The present paper tackles the different stages of graphic documentation and visualization undertaken in the Parpalló Cave (Cova del Parpalló), Gandia, Valencia. Besides traditional surveying documentation that is based on planimetric and altimetric maps, this paper presents the plotting and animated visualization of the Palaeolithic set not only making use of lights and shadows but also from photorealistic textured 3D models.</p>

scholarly journals 3D DOCUMENTATION OF CULTURAL HERITAGE: THE CASE STUDY OF BANTEAY SREI TEMPLE IN ANGKOR, SIEM REAP

2020 ◽  
Vol XLIII-B2-2020 ◽  
pp. 919-923
Author(s):  
L. Zhang ◽  
F. Wang ◽  
X. Cheng ◽  
C. Li ◽  
H. Lin ◽  
...  
Keyword(s):  
Cultural Heritage ◽  
Laser Scanning ◽  
3D Model ◽  
Digital Camera ◽  
3D Models ◽  
Laser Scanners ◽  
Aerial Vehicle ◽  
3D Documentation ◽  
Difficult Challenge

Abstract. 3D documentation and visualization of cultural heritage has a great significance in preserving the memories and history, and supports cultural tourism. It is of great importance to study the 3D reconstruction of cultural relics and historic sites. Preservation, visualization of valuable cultural heritage has always been a difficult challenge. With the developments of photogrammetry, terrestrial laser scanning, 3D models were able to obtained quickly and accurately. In this paper we present the survey and 3D modelling of an ancient temple, Banteay Srei, situated in Angkor, which has long been admired as a “Precious Gem” of Khmer Art for its miniature size of structures and exceptional refinement of the sculptures. The survey was performed with FARO Focus3D 330 and FARO Focus3D 120 terrestrial laser scanners, a micro unmanned aerial vehicle (UAV) (DJI Phantom 4 Pro) and a digital camera (Nikon D90). Once the acquired scans were properly merged, a 3D model was generated from the global point cloud, and plans, sections and elevations were extracted from it for restoration purposes. A short multimedia video was also created for the “Digital Banteay Srei”. In the paper we will discuss all the steps and challenges addressed to provide the 3D model of Banteay Srei Temple.

scholarly journals Teknik Pencocokan Citra dalam Fotogrametri untuk Dokumentasi Cagar Budaya

2017 ◽  
Author(s):  
Arnadi Murtiyoso ◽  
Deni Suwardhi
Keyword(s):  
Computer Vision ◽  
Case Studies ◽  
Image Matching ◽  
Laser Scanning ◽  
3D Model ◽  
State Of The Art ◽  
3D Models ◽  
The State ◽  
Software Packages ◽  
Matching Technique

AbstrakDewasa ini teknik pencocokan citra banyak dimanfaatkan dalam fotogrametri. Metode yang berasal dari ranah penglihatan komputer ini dapat mempermudah sejumlah tugas dalam fotogrametri yang sebelumnya harus dikerjakan secara manual. Fotogrametri sendiri merupakan teknik yang sering digunakan dalam dokumentasi cagar budaya dan arkeologi untuk menghasilkan model trimatra (3D). Fotogrametri dapat menjadi alternatif ataupun komplemen dari teknik pemindaian laser dalam menghasilkan model 3D yang akurat. Makalah ini bermaksud merangkum secara umum teknik pencocokan citra otomatis yang banyak digunakan di perangkat lunak fotogrametri modern, dengan menyertakan sejumlah contoh kasus untuk penggunaannya dalam rangka dokumentasi cagar budaya.Kata kunci: Pencocokan Citra, Fotogrametri, Cagar Budaya, Dokumentasi, Model 3D AbstractToday the image matching technique is used extensively in photogrammetry. This method, which originated from the computer vision domain, facilitates several tasks within the photogrammetric workflow which previously had to be performed manually. Photogrammetry itself is a technique which is often employed in the documentation of heritage as well as archaeology in order to create 3D models. Photogrammetry can be an alternative or a complement to laser scanning in producing accurate and reality-based 3D models. This paper will summarize the state of the art of the image matching technique often used in modern photogrammetry software packages. Several case studies of its use in the area of heritage documentation will also be presented.Keywords: Image Matching, Photogrammetry, Heritage, Documentation, 3D Model

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