scholarly journals 3D mass digitization: a milestone for archeological documentation

2017 ◽  
Vol 8 (16) ◽  
pp. 1 ◽  
Author(s):  
Pedro Santos ◽  
Martin Ritz ◽  
Constanze Fuhrmann ◽  
Dieter Fellner
Keyword(s):  
Computer Graphics ◽  
Cultural Heritage ◽  
Material Properties ◽  
Large Scale ◽  
Three Dimensional ◽  
Cultural Goods ◽  
Three Dimensional Objects ◽  
Fraunhofer Institute ◽  
Mass Digitization ◽  
3D Digitization

In the heritage field, the demand for fast and efficient 3D digitization technologies for historic remains is increasing. Besides, 3D digitization has proved to be a promising approach to enable precise reconstructions of objects. Yet, unlike the digital acquisition of cultural goods in 2D widely used today, 3D digitization often still requires a significant investment of time and money. To make it more widely available to heritage institutions, the <em>Competence Center for Cultural Heritage Digitization</em> at the <em>Fraunhofer Institute for Computer Graphics Research IGD</em> has developed <em>CultLab3D</em>, the world’s first 3D mass digitization facility for collections of three-dimensional objects. <em>CultLab3D</em> is specifically designed to automate the entire 3D digitization process thus allowing to scan and archive objects on a large-scale. Moreover, scanning and lighting technologies are combined to capture the exact geometry, texture, and optical material properties of artefacts to produce highly accurate photo-realistic representations. The unique setup allows to shorten the time needed for digitization to several minutes per artefact instead of hours, as required by conventional 3D scanning methods.

scholarly journals Linked Open Data Prototype of the Historical Archive of the European Commission

2020 ◽  
Vol 2020 (1) ◽  
pp. 92-97
Author(s):  
Mariana Damova
Keyword(s):  
Cultural Heritage ◽  
Large Scale ◽  
Three Dimensional ◽  
Open Data ◽  
Cultural Goods ◽  
Three Dimensional Objects ◽  
Manual Intervention ◽  
Fully Automatic ◽  
Mass Digitization ◽  
3D Digitization

The European Cultural Heritage Strategy for the 21st century has led to an increased demand for fast, efficient and faithful 3D digitization technologies for cultural heritage artefacts. Yet, unlike the digital acquisition of cultural goods in 2D which is widely used and automated today, 3D digitization often still requires significant manual intervention, time and money. To overcome this, the authors have developed CultLab3D, the world's first fully automatic 3D mass digitization technology for collections of three-dimensional objects. 3D scanning robots such as the CultArm3D-P are specifically designed to automate the entire 3D digitization process thus allowing to capture and archive objects on a large-scale and produce highly accurate photo-realistic representations.

scholarly journals The Effect of Material Properties on the Perceived Shape of Three-Dimensional Objects

i-Perception ◽  
2020 ◽  
Vol 11 (6) ◽  
pp. 204166952098231
Author(s):  
Masakazu Ohara ◽  
Juno Kim ◽  
Kowa Koida
Keyword(s):  
Material Properties ◽  
Regional Variation ◽  
Three Dimensional ◽  
Mean Square ◽  
Viewing Condition ◽  
Three Dimensional Objects ◽  
Transparent Objects ◽  
Dimensional Shape ◽  
Local Root ◽  
Three Dimensional Shape

Perceiving the shape of three-dimensional objects is essential for interacting with them in daily life. If objects are constructed from different materials, can the human visual system accurately estimate their three-dimensional shape? We varied the thickness, motion, opacity, and specularity of globally convex objects rendered in a photorealistic environment. These objects were presented under either dynamic or static viewing condition. Observers rated the overall convexity of these objects along the depth axis. Our results show that observers perceived solid transparent objects as flatter than the same objects rendered with opaque reflectance properties. Regional variation in local root-mean-square image contrast was shown to provide information that is predictive of perceived surface convexity.

3D Digitization of Architectural Heritage

2019 ◽  
pp. 51-85
Author(s):  
Caterina Morganti ◽  
Cristiana Bartolomei
Keyword(s):  
Cultural Heritage ◽  
Large Scale ◽  
Current Issue ◽  
Technological Application ◽  
Historical Buildings ◽  
Architectural Heritage ◽  
3D Digitization ◽  
Cloud Of Points

This project's principal intention is developing a structure from a motion thematic applied to an architecture field in both medium and large scale, in order to generate a cloud of points. These are obtained thanks to photographic footage, which can later be used during the H-BIM process. The matter of 3D digitalization is a very current issue for many countries including Cuba. The growth of such a technological application for tridimensional restitution of historical buildings is treated by giving special attention to those belonging to Havana's architectural and cultural heritage.

scholarly journals DebrisInterMixing-2.3: a finite volume solver for three-dimensional debris-flow simulations with two calibration parameters – Part 2: Model validation

2017 ◽  
Author(s):  
Albrecht v. Boetticher ◽  
Jens M. Turowski ◽  
Brian W. McArdell ◽  
Dieter Rickenmann ◽  
Marcel Hürlimann ◽  
...  
Keyword(s):  
Debris Flow ◽  
Model Validation ◽  
Material Properties ◽  
Large Scale ◽  
Fluid Dynamic ◽  
Three Dimensional ◽  
Clay Content ◽  
Friction Angle ◽  
Angle Of Repose ◽  
Model Parameters

Abstract. Here we present validation tests of the fluid dynamic solver presented in in v. Boetticher et al. (2016), simulating both laboratory-scale and large-scale debris-flow experiments. The new solver combines a Coulomb viscosplastic rheological model with a Herschel-Bulkley model based on material properties and rheological characteristics of the analysed debris flow. For the selected experiments in this study, all necessary material properties were known – the content of sand, clay (including its mineral composition) and gravel (including its friction angle) as well as the water content. We show that given these measured properties, two model parameters are sufficient for calibration, and a range of experiments with different material compositions can be reproduced by the model without recalibration. One calibration parameter, the Herschel–Bulkley exponent, was kept constant for all simulations. The model validation focuses on different case studies illustrating the sensitivity of debris flows to water and clay content, channel curvature, channel roughness and the angle of repose. We characterize the accuracy of the model using experimental observations of flow head positions, front velocities, run-out patterns and basal pressures.

scholarly journals Transparent Collision Visualization of Point Clouds Acquired by Laser Scanning

2019 ◽  
Vol 8 (9) ◽  
pp. 425
Author(s):  
Weite Li ◽  
Kenya Shigeta ◽  
Kyoko Hasegawa ◽  
Liang Li ◽  
Keiji Yano ◽  
...  
Keyword(s):  
Laser Scanning ◽  
Large Scale ◽  
Three Dimensional ◽  
Point Clouds ◽  
City Government ◽  
Three Dimensional Objects ◽  
Kyoto City ◽  
Risk Areas ◽  
Scale Point ◽  
The City

In this paper, we propose a method to visualize large-scale colliding point clouds by highlighting their collision areas, and apply the method to visualization of collision simulation. Our method uses our recent work that achieved precise three-dimensional see-through imaging, i.e., transparent visualization, of large-scale point clouds that were acquired via laser scanning of three-dimensional objects. We apply the proposed collision visualization method to two applications: (1) The revival of the festival float procession of the Gion Festival, Kyoto city, Japan. The city government plans to revive the original procession route, which is narrow and not used at present. For the revival, it is important to know whether the festival floats would collide with houses, billboards, electric wires, or other objects along the original route. (2) Plant simulations based on laser-scanned datasets of existing and new facilities. The advantageous features of our method are the following: (1) A transparent visualization with a correct depth feel that is helpful to robustly determine the collision areas; (2) the ability to visualize high collision risk areas and real collision areas; and (3) the ability to highlight target visualized areas by increasing the corresponding point densities.

scholarly journals A Critical Comparison of 3D Digitization Techniques for Heritage Objects

2020 ◽  
Vol 10 (1) ◽  
pp. 10
Author(s):  
Efstathios Adamopoulos ◽  
Fulvio Rinaudo ◽  
Liliana Ardissono
Keyword(s):  
Large Scale ◽  
Three Dimensional ◽  
Surface Characteristics ◽  
Processing Parameters ◽  
Three Dimensional Modeling ◽  
Dimensional Modeling ◽  
Accuracy And Precision ◽  
Passive Sensors ◽  
Computational Systems ◽  
3D Digitization

Techniques for the three-dimensional digitization of tangible heritage are continuously updated, as regards active and passive sensors, data acquisition approaches, implemented algorithms and employed computational systems. These developments enable higher automation and processing velocities, increased accuracy, and precision for digitizing heritage assets. For large-scale applications, as for investigations on ancient remains, heritage objects, or architectural details, scanning and image-based modeling approaches have prevailed, due to reduced costs and processing durations, fast acquisition, and the reproducibility of workflows. This paper presents an updated metric comparison of common heritage digitization approaches, providing a thorough examination of sensors, capturing workflows, processing parameters involved, metric and radiometric results produced. A variety of photogrammetric software were evaluated (both commercial and open sourced), as well as photo-capturing equipment of various characteristics and prices, and scanners employing different technologies. The experimentations were performed on case studies of different geometrical and surface characteristics to thoroughly assess the implemented three-dimensional modeling pipelines.

scholarly journals AUGMENTED TURIN BAROQUE ATRIA: AR EXPERIENCES FOR ENHANCING CULTURAL HERITAGE

2019 ◽  
Vol XLII-2/W9 ◽  
pp. 557-564
Author(s):  
V. Palma ◽  
R. Spallone ◽  
M. Vitali
Keyword(s):  
Augmented Reality ◽  
Cultural Heritage ◽  
Real Time ◽  
Mobile Devices ◽  
Research Team ◽  
Three Dimensional ◽  
Digital Archives ◽  
Three Dimensional Objects ◽  
Recent Developments ◽  
The Subject

<p><strong>Abstract.</strong> This paper presents the most recent developments in a project aimed to the documentation, storage and dissemination of the cultural heritage. The subject of the project are more than 70 Baroque atria in Turin, recognized by critics for their particular unitary vaulted systems Our research team is currently working on digitizing documents and studying ways to enhance and share these results through ICT. In particular, we want to explore possibilities for recognizing and tracing three-dimensional objects in augmented reality (AR) applications connected to the collected data. Recent developments in this field relate to the technology available on widespread mobile devices such as tablets and smartphones, allowing for real-time 3D scanning. Using software prototypes, we want to introduce some problems involved in integrating this technology into digital archives.</p>

scholarly journals Three-Dimensional-Printing of Bio-Inspired Composites

2016 ◽  
Vol 138 (2) ◽  
Author(s):  
Grace X. Gu ◽  
Isabelle Su ◽  
Shruti Sharma ◽  
Jamie L. Voros ◽  
Zhao Qin ◽  
...  
Keyword(s):  
3D Printing ◽  
Material Properties ◽  
Large Scale ◽  
Spider Silk ◽  
Three Dimensional ◽  
Hierarchical Structures ◽  
Building Blocks ◽  
Alternative Methods ◽  
Natural Materials ◽  
Multiple Materials

Optimized for millions of years, natural materials often outperform synthetic materials due to their hierarchical structures and multifunctional abilities. They usually feature a complex architecture that consists of simple building blocks. Indeed, many natural materials such as bone, nacre, hair, and spider silk, have outstanding material properties, making them applicable to engineering applications that may require both mechanical resilience and environmental compatibility. However, such natural materials are very difficult to harvest in bulk, and may be toxic in the way they occur naturally, and therefore, it is critical to use alternative methods to fabricate materials that have material functions similar to material function as their natural counterparts for large-scale applications. Recent progress in additive manufacturing, especially the ability to print multiple materials at upper micrometer resolution, has given researchers an excellent instrument to design and reconstruct natural-inspired materials. The most advanced 3D-printer can now be used to manufacture samples to emulate their geometry and material composition with high fidelity. Its capabilities, in combination with computational modeling, have provided us even more opportunities for designing, optimizing, and testing the function of composite materials, in order to achieve composites of high mechanical resilience and reliability. In this review article, we focus on the advanced material properties of several multifunctional biological materials and discuss how the advanced 3D-printing techniques can be used to mimic their architectures and functions. Lastly, we discuss the limitations of 3D-printing, suggest possible future developments, and discuss applications using bio-inspired materials as a tool in bioengineering and other fields.

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