3d scan
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2022 ◽  
Vol 41 (1) ◽  
pp. 1-17
Author(s):  
Xin Chen ◽  
Anqi Pang ◽  
Wei Yang ◽  
Peihao Wang ◽  
Lan Xu ◽  
...  

In this article, we present TightCap, a data-driven scheme to capture both the human shape and dressed garments accurately with only a single three-dimensional (3D) human scan, which enables numerous applications such as virtual try-on, biometrics, and body evaluation. To break the severe variations of the human poses and garments, we propose to model the clothing tightness field—the displacements from the garments to the human shape implicitly in the global UV texturing domain. To this end, we utilize an enhanced statistical human template and an effective multi-stage alignment scheme to map the 3D scan into a hybrid 2D geometry image. Based on this 2D representation, we propose a novel framework to predict clothing tightness field via a novel tightness formulation, as well as an effective optimization scheme to further reconstruct multi-layer human shape and garments under various clothing categories and human postures. We further propose a new clothing tightness dataset of human scans with a large variety of clothing styles, poses, and corresponding ground-truth human shapes to stimulate further research. Extensive experiments demonstrate the effectiveness of our TightCap to achieve the high-quality human shape and dressed garments reconstruction, as well as the further applications for clothing segmentation, retargeting, and animation.


Author(s):  
Anders F. Mikkelstrup ◽  
Morten Kristiansen ◽  
Ewa Kristiansen

AbstractHigh-frequency mechanical impact (HFMI) treatment is a well-documented post-weld treatment to improve the fatigue life of welds. Treatment of the weld toe must be performed by a skilled operator due to the curved and inconsistent nature of the weld toe to ensure an acceptable quality. However, the process is characterised by noise and vibrations; hence, manual treatment should be avoided for extended periods of time. This work proposes an automated system for applying robotised 3D scanning to perform post-weld treatment and quality inspection of linear welds. A 3D scan of the weld is applied to locally determine the gradient and curvature across the weld surface to locate the weld toe. Based on the weld toe position, an adaptive robotic treatment trajectory is generated that accurately follows the curvature of the weld toe and adapts tool orientation to the weld profile. The 3D scan is reiterated after the treatment, and the surface gradient and curvature are further applied to extract the quantitative measures of the treatment, such as weld toe radius, indentation depth, and groove deviation and width. The adaptive robotic treatment is compared experimentally to manual and linear robotic treatment. This is done by treating 600-mm weld toe of each treatment type and evaluating the quantitative measures using the developed system. The results showed that the developed system reduced the overall treatment variance by respectively 26.6% and 31.9%. Additionally, a mean weld toe deviation of 0.09 mm was achieved; thus, improving process stability yet minimising human involvement.


Bauingenieur ◽  
2022 ◽  
Vol 97 (01-02) ◽  
pp. 38-46
Author(s):  
Zhen Li ◽  
Hartmut Pasternak ◽  
Andreas Jäger-Cañás

Moderne Behälter werden oft als ringversteifte Kreiszylinderschalen ausgeführt. Der traglaststeigernde Effekt eng liegender Ringsteifen unter Axialdruck erfuhr in der Forschung bis heute nur geringe Beachtung. Er ist bisher ungeregelt und infolge unnötig hohen Materialeinsatzes bleiben Stahlbehältern Marktanteile und bessere Nachhaltigkeit verwehrt. Anhand von Versuchen und einer numerischen Studie werden die neuesten Forschungsergebnisse des Einflusses der Ringsteifen auf das Axialbeulverhalten von Kreiszylinderschalen erläutert. Die Ergebnisse zeigen, dass die ringversteiften Kreiszylinder unter Axialdruck nach der aktuellen Bemessungspraxis unwirtschaftlich bemessen werden.   Im Teil 1 dieses Beitrags werden Versuche im verkleinertem Maßstab durchgeführt, um den Einfluss der Ringsteifen auf das Beulverhalten der Kreiszylinderschalen unter Axialdruck zu erforschen. Gemäß einem Vergleich von Versuchsergebnissen wird eine mehrfach höhere Tragfähigkeit ringversteifter Schalen gegenüber unversteiften Schalen ermittelt. Die geometrischen Imperfektionen des Probekörpers werden durch eine 3D-Scan-Technologie gemessen und danach mittels der Methode der Fourier-Reihen analysiert. Im Teil 2 folgen die numerische Simulation und das Ableiten eines Ingenieurmodells.


2021 ◽  
Vol 16 (12) ◽  
pp. C12011
Author(s):  
V.A. Allakhverdyan ◽  
A.D. Avrorin ◽  
A.V. Avrorin ◽  
V.M. Aynutdinov ◽  
R. Bannasch ◽  
...  

Abstract The Large-scale deep underwater Cherenkov neutrino telescopes like Baikal-GVD, ANTARES or KM3NeT, require calibration and testing methods of their optical modules. These methods usually include laser-based systems which allow us to check the telescope responses to the light and for real-time monitoring of the optical parameters of water such as absorption and scattering lengths, which show seasonal changes in natural reservoirs of water. We will present a testing method of a laser calibration system and a set of dedicated tools developed for Baikal-GVD, which includes a specially designed and built, compact, portable, and reconfigurable scanning station. This station is adapted to perform fast quality tests of the underwater laser sets just before their deployment in the telescope structure, even on ice, without a darkroom. The testing procedure includes the energy stability test of the laser device, 3D scan of the light emission from the diffuser and attenuation test of the optical elements of the laser calibration system. The test bench consists primarily of an automatic mechanical scanner with a movable Si detector, beam splitter with a reference Si detector and, optionally, Q-switched diode-pumped solid-state laser used for laboratory scans of the diffusers. The presented test bench enables a 3D scan of the light emission from diffusers, which are designed to obtain the isotropic distribution of photons around the point of emission. The results of the measurement can be easily shown on a 3D plot immediately after the test and may be also implemented to a dedicated program simulating photons propagation in water, which allows us to check the quality of the diffuser in the scale of the Baikal-GVD telescope geometry.


2021 ◽  
pp. 1-20
Author(s):  
Ying Bai ◽  
Tao Chen

There is a brick-vault roofed bathroom building, commonly known as the Cistern Hall (Wengtang), opposite the Grand Baoen Temple Heritage and Scenic Area near the Zhonghua Gate in Nanjing. This article analyzes its shape and characteristics by means of a 3D scan that surveys and maps out 2019 data on the site. On this basis, this article suggests that the bathroom may have been built as an annex to the Grand Baoen Temple in the early Ming dynasty. This kind of bathroom design originated in West Asia, entered China during the Yuan dynasty (1271‒1368) and became popular in the Jiangnan region during the Ming (1368‒1644) and Qing (1644‒1911) dynasties. In a lively exchange of architectural ideas, it bore witness to rich, in-depth architectural cultural exchanges between China, Central Asia, and West Asia in the Yuan and Ming dynasties.


2021 ◽  
Author(s):  
Christiane Keil ◽  
◽  
Dominik Haim ◽  
Ines Zeidler-Rentzsch ◽  
Franz Tritschel ◽  
...  
Keyword(s):  
3D Scan ◽  

Die Idealvorstellung eines vollständig digitalisierten Behandlungsalltags rückt mit fortschreitender technologischer und informationeller Entwicklung stetig näher an die Realität. Zu Beginn bestand lediglich die Möglichkeit einer elektronischen Patientenakte, hinzu kamen vielfältige Möglichkeiten der digitalen Bildgebung und wurden schließlich um das Ziel eines vollständigen digitalen Workflows ergänzt. Die Planung der interdisziplinären kieferorthopädischen / kieferchirurgischen Versorgung von Patienten mit Lippen-Kiefer-Gaumen-Spalten (LKGS) wurde bis vor kurzem am Universitätsklinikum Dresden noch hauptsächlich analog durchgeführt. Eine volldigitalisierte Behandlungsplanung unter Einbeziehung aller beteiligten Behandler fand nicht statt. Ziel des Projektes war es deshalb, eine digitale Plattform zur interdisziplinären zahnmedizinischen Versorgung von LKGS-Patienten zu schaffen. Dazu wurde zuerst die bisher erforderliche Abdrucknahme mittels Alginat und die anschließende Herstellung eines Gipsmodells durch einen intraoralen 3D-Scan der Zahnbögen des Patienten abgelöst. Anhand des intraoralen 3D-Scans können nun die erforderlichen Trinkplatten mittels 3D-Druck erstellt werden. Zweiter Schritt war die Anfertigung von 3D-Aufnahmen der Weichteile des Gesichtes mittels eines extraoralen 3D-Scanners. Als dritter Schritt erfolgte die Anfertigung von Digitalen Volumentomografie (DVT)-Aufnahmen zur 3D-Darstellung des Schädelknochens und Kieferskeletts. Nach der Anfertigung wurden diese bildbasierten Datensätze zu einem „digitalen Zwilling“ (virtuelles 3D-Modell aus DVT, intra- und extraoralen 3D-Scan) zusammengefasst, wodurch erstmalig ein umfassendes 3D-Modell des Mund-Kiefer-Raumes einschließlich wichtiger Informationen zum Kiefergelenk und der anliegenden Weichteile entstand. Dieses virtuelle Modell bildet jetzt die Grundlage für die Behandlungsplanung und die Planung der weiteren zahnmedizinischen und medizinischen Versorgung. Es konnte also im Projekt die komplette Digitalisierung der Diagnostik, die Etablierung einer Fusionsplattform und der Datenaustausch zwischen Uniklinik und privater Praxis umgesetzt werden.


2021 ◽  
Author(s):  
Anders Faarbæk Mikkelstrup ◽  
Morten Kristiansen ◽  
Ewa Kristiansen

Abstract High-frequency mechanical impact (HFMI) treatment is a well-documented post-weld treatment to improve the fatigue life of welds. Treatment of the weld toe must be performed by a skilled operator due to the curved and inconsistent nature of the weld toe to ensure an acceptable quality. However, the process is characterised by noise and vibrations; hence, manual treatment should be avoided for extended periods of time. This work proposes an automated system for applying robotised 3D scanning to perform post-weld treatment and quality inspection of linear welds. A 3D scan of the weld is applied to locally determine the gradient and curvature across the weld surface to locate the weld toe. Based on the weld toe position, an adaptive robotic treatment trajectory is generated that accurately follows the curvature of the weld toe and adapts tool orientation to the weld profile. The 3D scan is reiterated after the treatment, and the surface gradient and curvature are further applied to extract the quantitative measures of the treatment, such as groove radius, weld toe deviation, and indentation depth and width. The adaptive robotic treatment is compared experimentally to manual and linear robotic treatment. This is done by treating 600 mm weld toe of each treatment type and evaluating the quantitative measures using the developed system. The results showed that the developed system reduced the overall treatment variance by respectively 26.6 % and 31.9 %. Additionally, a mean weld toe deviation of 0.09 mm was achieved; thus, improving process stability yet minimising human involvement.


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