scholarly journals A functional analysis of two 3D-scanned antique pistols from New Zealand

2020 ◽  
Vol 11 (22) ◽  
pp. 85
Author(s):  
John LaRocco ◽  
Dong-Guk Paeng
Keyword(s):  
Functional Analysis ◽  
New Zealand ◽  
Three Dimensional ◽  
3D Models ◽  
3D Scanning ◽  
Intermediate Step ◽  
Digital Models ◽  
Historical Preservation ◽  
Victorian Era ◽  
3D Computer Model

<p class="VARAbstract">Preservation of historical weapons requires continual and careful maintenance. Digital three-dimensional (3D) scanning can assist in preservation and analysis by generating a 3D computer model. New Zealand presents a special case for historical preservation, owing to the rapid import of European goods in a culture previously unexposed to metalworking. This, and the subsequent British colonization, led to upheaval and war. The most intense conflict between British and Maori forces was in the New Zealand Land Wars of the mid-19<sup>th</sup> century. The primary handheld firearms used in this period were black-powder muzzle-loaders, and the variety of armed factions involved in the war resulted in an eclectic range of weapons used. Two antique muzzle-loading pistols from this period were scanned and analyzed. Insights were gained into the history of double-barreled muzzle-loading pistols and transitional revolvers. The double-barreled pistol was determined to have been a flintlock pistol from a century prior to the Land Wars, later converted to percussion cap ignition. The transitional revolver was an intermediate step between the multi-barrel pepperbox pistol and the “true” revolver, but it remained in use throughout the Victorian era. Both types of firearms were effectively obsolete elsewhere in the world by the time of the Land Wars, but the conflict created a demand for a variety of weapons. While the pistols analyzed in this study are decommissioned and no longer in working order, the 3D models made from the samples afforded a unique glimpse into New Zealand’s history. The methodology detailed over the course of the study can be applied to other historical firearms in order to facilitate preservation, investigation, and experimentation.</p><p>Highlights:</p><ul><li><p>Preservation of historical machines requires continual maintenance, including replacement of worn or missing parts.</p></li><li><p>A combination of 3D scanning and digital models was used to analyze two antique pistols from New Zealand: a converted flintlock pistol and a transitional revolver.</p></li><li><p>The method of making and analyzing digital models detailed in this study offers a way to facilitate historical preservation, experimental archaeology, and functional analysis.</p></li></ul>

scholarly journals Structured-light 3D scanning of exhibited historical clothing—a first-ever methodical trial and its results

2021 ◽  
Vol 9 (1) ◽  
Author(s):  
Jerzy Montusiewicz ◽  
Marek Miłosz ◽  
Jacek Kęsik ◽  
Kamil Żyła
Keyword(s):  
Cultural Heritage ◽  
Information Technologies ◽  
Structured Light ◽  
Three Dimensional ◽  
3D Models ◽  
3D Scanning ◽  
Dimensional Representation ◽  
3D Scanner ◽  
Three Dimensional Representation ◽  
3D Scanners

AbstractHistorical costumes are part of cultural heritage. Unlike architectural monuments, they are very fragile, which exacerbates the problems of their protection and popularisation. A big help in this can be the digitisation of their appearance, preferably using modern techniques of three-dimensional representation (3D). The article presents the results of the search for examples and methodologies of implementing 3D scanning of exhibited historical clothes as well as the attendant problems. From a review of scientific literature it turns out that so far practically no one in the world has made any methodical attempts at scanning historical clothes using structured-light 3D scanners (SLS) and developing an appropriate methodology. The vast majority of methods for creating 3D models of clothes used photogrammetry and 3D modelling software. Therefore, an innovative approach was proposed to the problem of creating 3D models of exhibited historical clothes through their digitalisation by means of a 3D scanner using structural light technology. A proposal for the methodology of this process and concrete examples of its implementation and results are presented. The problems related to the scanning of 3D historical clothes are also described, as well as a proposal how to solve them or minimise their impact. The implementation of the methodology is presented on the example of scanning elements of the Emir of Bukhara's costume (Uzbekistan) from the end of the nineteenth century, consisting of the gown, turban and shoes. Moreover, the way of using 3D models and information technologies to popularise cultural heritage in the space of digital resources is also discussed.

scholarly journals Comparative Analysis of Digital Models of Objects of Cultural Heritage Obtained by the “3D SLS” and “SfM” Methods

2021 ◽  
Vol 11 (12) ◽  
pp. 5321
Author(s):  
Marcin Barszcz ◽  
Jerzy Montusiewicz ◽  
Magdalena Paśnikowska-Łukaszuk ◽  
Anna Sałamacha
Keyword(s):  
Cultural Heritage ◽  
Low Cost ◽  
Three Dimensional ◽  
3D Models ◽  
Silk Road ◽  
Digital Models ◽  
Global Pandemic ◽  
University Of Technology ◽  
Three Dimensional Models ◽  
3D Digitisation

In the era of the global pandemic caused by the COVID-19 virus, 3D digitisation of selected museum artefacts is becoming more and more frequent practice, but the vast majority is performed by specialised teams. The paper presents the results of comparative studies of 3D digital models of the same museum artefacts from the Silk Road area generated by two completely different technologies: Structure from Motion (SfM)—a method belonging to the so-called low-cost technologies—and by Structured-light 3D Scanning (3D SLS). Moreover, procedural differences in data acquisition and their processing to generate three-dimensional models are presented. Models built using a point cloud were created from data collected in the Afrasiyab museum in Samarkand (Uzbekistan) during “The 1st Scientific Expedition of the Lublin University of Technology to Central Asia” in 2017. Photos for creating 3D models in SfM technology were taken during a virtual expedition carried out under the “3D Digital Silk Road” program in 2021. The obtained results show that the quality of the 3D models generated with SfM differs from the models from the technology (3D SLS), but they may be placed in the galleries of the vitrual museum. The obtained models from SfM do not have information about their size, which means that they are not fully suitable for archiving purposes of cultural heritage, unlike the models from SLS.

scholarly journals Combining quantitative analysis with an elliptic Fourier descriptor: A study of pottery from the Gansu-Zhanqi site based on 3D scanning and computer technology

2020 ◽  
Author(s):  
JIN WANG ◽  
wei Qian ◽  
guoke Chen
Keyword(s):  
Quantitative Analysis ◽  
Computer Technology ◽  
Three Dimensional ◽  
3D Models ◽  
3D Scanning ◽  
Computer Assisted ◽  
Fourier Descriptor ◽  
Objective Classification ◽  
Archaeological Analysis

Abstract Pottery is an important material in archaeological studies, and the accurate classification of pottery shapes largely depends on the experience and knowledge of archaeologists. In this thesis, pottery taken from the Gansu-Zhanqi site is used for sampling. Three-dimensional (3D) models of the pottery were obtained using 3D scanning, and a computer-assisted pottery typology was studied through quantitative analysis and elliptic Fourier descriptor. This method, which can enhance and supplement the traditional methods of classifying pottery in archaeology and thereby enrich the parameters and breadth of pottery analysis, represents a new means for exploring and experimenting with objective classification and provides a new tool for traditional archaeological analysis methods.

scholarly journals THE CONCEPTUAL PRINCIPLES OF USING DIGITAL 3D MODEL AS A MEANS OF COGNITION AND REPRESENTATION OF SIGNS OF CRIMINAL OFFENSE

2021 ◽  
pp. 537-550
Author(s):  
А. Kovalenko
Keyword(s):  
3D Model ◽  
Three Dimensional ◽  
3D Models ◽  
3D Scanning ◽  
Criminal Proceedings ◽  
Three Dimensional Model ◽  
Significant Information ◽  
Criminal Offense ◽  
Spatial Features ◽  
Object Based

The article forms the conceptual principles of use of digital 3D model as means of cognition and display of signs of a criminal offense in criminal proceedings. A 3D model can be defined as a digital, three-dimensional image of an object, which reflects its external structure and color, accurately and proportionally reproduces the ratio of its spatial features. It can directly contain information about the shape, proportions, color and mutual placement in space of the elements of the original object. Provided the manufacturing technology is followed, the model is isomorphic to original object. Such a model serves as a means of cognition and reflection of forensically significant features of a criminal offense. The main methods for making 3D models are reconstruction (modeling) and scanning. 3D reconstruction (or 3D modeling) can be defined as the process of reproducing a 3D model of a forensic significant object based on information about it contained in the materials of criminal proceedings. The reconstructed models can be used during investigative (search) actions and for solving organizational problems. 3D scanning consists in the direct fixation of the external spatial features of the object using a special software and hardware complex, followed by the formation of a digital three-dimensional model of the object. Subject to compliance with the procedural requirements for the use of technical means of fixing forensically significant information, scanned 3D models will be sources of evidentiary information in criminal proceedings. 3D scanning is a promising method for recording the course and results of an inspection of the scene of an incident, inspection of a corpse or things; it can be used for fixing signs of a person's appearance, as well as for solving identification and diagnostics tasks in forensic activities. The invariability of the 3D model can be ensured by calculating the hash of the file that contains it.

scholarly journals A COMPARISON OF LASER AND STRUCTURED LIGHT SCANNING TECHNOLOGIES FOR ARCHAEOLOGICAL APPLICATIONS

2021 ◽  
Vol 13 (3) ◽  
pp. 111-116
Author(s):  
Nikolaos Papas ◽  
◽  
Konstantinos Tsongas ◽  
Dimitrios Karolidis ◽  
Dimitrios Tzetzis ◽  
...  
Keyword(s):  
Structured Light ◽  
Three Dimensional ◽  
3D Models ◽  
3D Scanning ◽  
Acquisition Time ◽  
Digital Reference ◽  
Scanning Time ◽  
Actual Equipment ◽  
Scan Data

Reverse engineering and in particular three-dimensional digitization have become an essential part of the documentation of archaeological findings. 3D scanning produces a high-precision digital reference document. The factors that influence the quality of the 3D scanned data are the scanned object’s surface colour, its glossiness and geometry, and the ambient light during the scanning process. However, the actual equipment and scanning technologies are of primary importance. The current paper presents a qualitative and quantitative comparison between two 3D scanning devices of different technologies; structured light 3D scanning and laser 3D scanning. The benchmark for this comparison is an ancient Roman vase from the city of Thessaloniki, Greece. The object was scanned with every possible setting on each scanner, but only one configuration of settings on each device was selected for the final comparison. The main criterion for the final selection of the two 3D models acquired with the use of the two technologies was the proximity in the number of points and polygons produced for digitally restoring the ancient vase in the best possible way. The results indicate important differences regarding the accuracy of the final digital model. The laser technology produced better accuracy but with a significant cost in scanning time and model data size. On the other hand, the structured light technology achieved the optimal combination of scanning quality and accuracy, along with reduced acquisition time of scan data.

scholarly journals REALDIST: Real-valued protein distance prediction

2020 ◽  
Author(s):  
Badri Adhikari
Keyword(s):  
Structure Prediction ◽  
3D Structure ◽  
Three Dimensional ◽  
Prediction Method ◽  
3D Models ◽  
Classification Problem ◽  
Intermediate Step ◽  
Protein Distance ◽  
Multi Class Classification ◽  
Distance Prediction

AbstractProtein structure prediction continues to stand as an unsolved problem in bioinformatics and biomedicine. Deep learning algorithms and the availability of metagenomic sequences have led to the development of new approaches to predict inter-residue distances—the key intermediate step. Different from the recently successful methods which frame the problem as a multi-class classification problem, this article introduces a real-valued distance prediction method REALDIST. Using a representative set of 43 thousand protein chains, a variant of deep ResNet is trained to predict real-valued distance maps. The contacts derived from the real-valued distance maps predicted by this method, on the most difficult CASP13 free-modeling protein datasets, demonstrate a long-range top-L precision of 52%, which is 17% higher than the top CASP13 predictor Raptor-X and slightly higher than the more recent trRosetta method. Similar improvements are observed on the CAMEO ‘hard’ and ‘very hard’ datasets. Three-dimensional (3D) structure prediction guided by real-valued distances reveals that for short proteins the mean accuracy of the 3D models is slightly higher than the top human predictor AlphaFold and server predictor Quark in the CASP13 competition.

scholarly journals Combining quantitative analysis with an elliptic Fourier descriptor: A study of pottery from the Gansu-Zhanqi site based on 3D scanning and computer technology

2020 ◽  
Author(s):  
JIN WANG ◽  
wei Qian ◽  
guoke Chen
Keyword(s):  
Quantitative Analysis ◽  
Computer Technology ◽  
Three Dimensional ◽  
3D Models ◽  
3D Scanning ◽  
Computer Assisted ◽  
Fourier Descriptor ◽  
Objective Classification ◽  
Archaeological Analysis

Abstract Pottery is an important material in archaeological studies, and the accurate classification of pottery shapes largely depends on the experience and knowledge of archaeologists. In this thesis, pottery taken from the Gansu-Zhanqi site is used for sampling. Three-dimensional (3D) models of the pottery were obtained using 3D scanning, and a computer-assisted pottery typology was studied through quantitative analysis and elliptic Fourier descriptor. This method, which can enhance and supplement the traditional methods of classifying pottery in archaeology and thereby enrich the parameters and breadth of pottery analysis, represents a new means for exploring and experimenting with objective classification and provides a new tool for traditional archaeological analysis methods.

scholarly journals Combining quantitative analysis with an elliptic Fourier descriptor: A study of pottery from the Gansu-Zhanqi site based on 3D scanning and computer technology

2020 ◽  
Author(s):  
JIN WANG ◽  
wei Qian ◽  
guoke Chen
Keyword(s):  
Quantitative Analysis ◽  
Computer Technology ◽  
Three Dimensional ◽  
3D Models ◽  
3D Scanning ◽  
Computer Assisted ◽  
Elliptic Fourier Analysis ◽  
Objective Classification ◽  
Archaeological Analysis

Abstract Pottery is an important material in archaeological studies, and the accurate classification of pottery shapes largely depends on the experience and knowledge of archaeologists. In this thesis, pottery taken from the Gansu-Zhanqi site is used for sampling. Three-dimensional (3D) models of the pottery were obtained using 3D scanning, and a computer-assisted pottery typology was studied through quantitative analysis and elliptic Fourier analysis. This method, which can enhance and supplement the traditional methods of classifying pottery in archaeology and thereby enrich the parameters and breadth of pottery analysis, represents a new means for exploring and experimenting with objective classification and provides a new tool for traditional archaeological analysis methods.

scholarly journals Reproducibility of Digital Indirect Bonding Technique Using Three-dimensional (3d) Models and 3d-printed Transfer Trays

2019 ◽  
Vol 90 (1) ◽  
pp. 92-99 ◽  
Author(s):  
Maria Eduarda Assad Duarte ◽  
Bruno Frazão Gribel ◽  
Alice Spitz ◽  
Flavia Artese ◽  
José Augusto Mendes Miguel
Keyword(s):  
Repeated Measures ◽  
Intraclass Correlation ◽  
Three Dimensional ◽  
Correlation Coefficients ◽  
3D Models ◽  
Digital Models ◽  
Intraclass Correlation Coefficients ◽  
Indirect Bonding ◽  
3D Printed ◽  
Clinically Significant

ABSTRACT Objective To evaluate the reproducibility of digital tray transfer fit on digital indirect bonding by analyzing the differences in bracket positions. Materials and Methods Digital indirect bonding was performed by positioning brackets on digital models superimposed by tomography using Ortho Analyzer (3Shape) software. Thirty-three orthodontists performed indirect bonding on prototyped models of the same malocclusion using prototyped transfer trays for two types of brackets (MiniSprint Roth and BioQuick self-ligating). The models with brackets were scanned using an intraoral scanner (Trios, 3Shape). Superimpositions were made between the digital models obtained after indirect bonding and those from the original virtual setup. To analyze the differences in bracket positions, three planes were examined for each bracket: vertical, horizontal, and angulation. Three orthodontists repeated indirect bonding after 15 days, and Bland-Altman plots and intraclass correlation coefficients were used to evaluate inter- and intraevaluator reproducibility and reliability, respectively. Repeated-measures analysis of variance (ANOVA) was used to analyze the differences between bracket positions, and multivariate ANOVA was used to evaluate the influence of orthodontists' experience on the results. Results Differences between bracket positions were not statistically significant, except mesial-distal discrepancies in the BioQuick group (P = .016). However, differences were not clinically significant (horizontal varied from 0.04 to 0.13 mm; angulation, 0.45° to 2.03°). There was no significant influence of orthodontist experience and years of clinical practice on bracket positions (P = .314 and P = .158). The reproducibility among orthodontists was confirmed. Conclusions The reproducibility of digital indirect bonding was confirmed in terms of bracket positions using three-dimensional printed transfer trays.

scholarly journals Three-Dimensional Physique Assessment in the Military: New Zealand Defence Force Anthropometry Survey Protocols and Summary Statistics

2021 ◽  
Author(s):  
Stephven Kolose ◽  
◽  
Patria Hume ◽  
Tom Stewart ◽  
Grant Tomkinson ◽  
...  
Keyword(s):  
New Zealand ◽  
Large Scale ◽  
Measurement Techniques ◽  
Three Dimensional ◽  
Data Interpretation ◽  
3D Scanning ◽  
3D Images ◽  
The Military ◽  
Assess Body Composition ◽  
Preparation Equipment

This book describes how to conduct a large-scale anthropometric survey in the military with a specific focus on the New Zealand Defence Force Anthropometry Survey. This book provides a historical introduction to surface kinanthropometry (Part I), 3D scanning technology (Part II) and an overview of military anthropometry surveys in Part IV. It also provides a description of the New Zealand Defence Force (NZDF) anthropometry survey in Part IV, conclusions in Part V and concludes with the measurement technique protocols and normative data for the NZDF kinanthropometry survey in Part VI. While surface anthropometry has traditionally been used to assess body composition through the internationally recognised methodology of the International Society for the Advancement of Kinanthropometry (ISAK), the commercialisation of three-dimensional photometry (3D scanning) has led to the adoption of new and often non-standardised, measurement techniques. We detail standardisation procedures for 3D scanning in terms of participant preparation, equipment calibration, test protocols, data reporting and data interpretation. We outline how 3D scanning works, what it is used to measure, and what the issues are surrounding its validity, practicality, and reliability. This book provides an essential reference for practitioners wishing to measure military physique. We have not presented 3-D assessment data (i.e. surface manifold, volumetric, symmetry or shape analysis). We have only extracted 1-D measures from 3D images in this eBook.

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