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Smooth Triaxial Weaving with Naturally Curved Ribbons

Physical Review Letters 2021年第10期127卷 104301-104301页

作者： Changyeob Baek Alison G. Martin Samuel Poincloux Tian Chen Pedro M. Reis Department of Mechanical Engineering Massachusetts Institute of Technology Cambridge Massachusetts 02139 USA Flexible Structures Laboratory Institute of Mechanical Engineering École Polytechnique Fédérale de Lausanne (EPFL) Lausanne 1015 Switzerland Fivizzano Italy Computer Graphics and Geometry Laboratory School of Computer and Communication Sciences École Polytechnique Fédérale de Lausanne (EPFL) Lausanne 1015 Switzerland

Triaxial weaving is a handicraft technique that has long been used to create curved structures using initially straight and flat ribbons. Weavers typically introduce discrete topological defects to produce nonzero Gaussian curvature, albeit with faceted surfaces. We demonstrate that, by tuning the in-plane curvature of the ribbons, the integrated Gaussian curvature of the weave can be varied continuously, which is not feasible using traditional techniques. Further, we reveal that the shape of the physical unit cells is dictated solely by the in-plane geometry of the ribbons, not elasticity. Finally, we leverage the geometry-driven nature of triaxial weaving to design a set of ribbon profiles to weave smooth spherical, ellipsoidal, and toroidal structures.

关键词： Elasticity Topological defects Crystal structures Thin films Finite-element method geometry Laser techniques

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Iso-level tool path planning for free-form surfaces

arXiv

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arXiv 2018年

作者： Zou, Qiang Zhang, Juyong Deng, Bailin Zhao, Jibin School of Mathematical Sciences University of Science and Technology of China Anhui230026 China Computer Graphics and Geometry Laboratory École Polytechnique Fédérale de Lausanne LausanneCH-1015 Switzerland Shenyang Institute of Automation Chinese Academy of Sciences Liaoning110016 China

The aim of tool path planning is to maximize the efficiency against some given precision criteria. In practice, scallop height should be kept constant to avoid unnecessary cutting, while the tool path should be smooth enough to maintain a high feed rate. However, iso-scallop and smoothness often conflict with each other. Existing methods smooth iso-scallop paths one-by-one, which makes the final tool path far from being globally optimal. This paper proposes a new framework for tool path optimization. It views a family of iso-level curves of a scalar function defined over the surface as tool path so that desired tool path can be generated by finding the function that minimizes certain energy functional and different objectives can be considered simultaneously. We use the framework to plan globally optimal tool path with respect to iso-scallop and smoothness. The energy functionals for planning iso-scallop, smoothness, and optimal tool path are respectively derived, and the path topology is studied too. Experimental results are given to show effectiveness of the proposed methods. Copyright © 2018, The Authors. All rights reserved.

关键词： Molluscs

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Exploratory Topology Modelling of Form-active Hybrid Structures

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Procedia Engineering 2016年 155卷 71-80页

作者： Anders Holden Deleuran Mark Pauly Martin Tamke Ida Friis Tinning Mette Ramsgaard Thomsen Center for Information Technology and Architecture (CITA) KADK Copenhagen 1435 Denmark Computer Graphics and Geometry Laboratory (LGG) EPFL Lausanne CH-1015 Switzerland

The development of novel form-active hybrid structures (FAHS) is impeded by a lack of modelling tools that allow for exploratory topology modelling of shaped assemblies. We present a flexible and real-time computational design modelling pipeline developed for the exploratory modelling of FAHS that enables designers and engineers to iteratively construct and manipulate form-active hybrid assembly topology on the fly. The pipeline implements Kangaroo2's projection-based methods for modelling hybrid structures consisting of slender beams and cable networks. A selection of design modelling sketches is presented in which the developed modelling pipeline has been integrated to explore the design space delineated by FAHS.

关键词： Form-Active Hybrid Structures Topology Shaping Form-Finding Interactive Modelling Design Space Search

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Patient MoCap: Human pose estimation under blanket occlusion for hospital monitoring applications 1st

Patient MoCap: Human pose estimation under blanket occlusion...

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1st International Workshop on Simulation and Synthesis in Medical Imaging, SASHIMI 2016 held in conjunction with 19th International Conference on Medical Image Computing and computer-Assisted Intervention, MICCAI 2016

作者： Achilles, Felix Ichim, Alexandru-Eugen Coskun, Huseyin Tombari, Federico Noachtar, Soheyl Navab, Nassir Computer Aided Medical Procedures Technische Universität München Munich Germany Department of Neurology Ludwig-Maximilians-University of Munich Munich Germany Graphics and Geometry Laboratory EPFL Lausanne Switzerland DISI University of Bologna Bologna Italy Computer Aided Medical Procedures Johns Hopkins University Baltimore United States

ISBN: (纸本)9783319467191

Motion analysis is typically used for a range of diagnostic procedures in the hospital. While automatic pose estimation from RGBD input has entered the hospital in the domain of rehabilitation medicine and gait analysis,no such method is available for bed-ridden patients. However,patient pose estimation in the bed is required in several fields such as sleep laboratories,epilepsy monitoring and intensive care units. In this work,we propose a learning-based method that allows to automatically infer 3D patient pose from depth images. To this end we rely on a combination of convolutional neural network and recurrent neural network,which we train on a large database that covers a range of motions in the hospital bed. We compare to a state of the art pose estimation method which is trained on the same data and show the superior result of our method. Furthermore,we show that our method can estimate the joint positions under a simulated occluding blanket with an average joint error of 7.56 cm. © Springer International Publishing AG 2016.

关键词： Diagnosis

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Shrec'16 Track: Retrieval of Human Subjects from Depth Sensor Data 9

Shrec'16 Track: Retrieval of Human Subjects from Depth Senso...

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9th Eurographics Workshop on 3D Object Retrieval, 3DOR 2016

作者： Giachetti, A. Fornasa, F. Parezzan, F. Saletti, A. Zambaldo, L. Zanini, L. Achilles, F. Ichim, A.E. Tombari, F. Navab, N. Velasco-Forero, S. Department of Computer Science University of Verona Track Organizers Italy Computer Aided Medical Procedures Technische Universitat Munchen Germany Department of Neurology Ludwig-Maximilians-University of Munich Germany Graphics and Geometry Laboratory ÉCole Polytechnique Fédérale de Lausanne Switzerland University of Bologna Disi Italy Johns-Hopkins-University Computer Aided Medical Procedures United States Cmm / Mines-Paris Tech France

In this paper we report the results of the SHREC 2016 contest on "Retrieval of human subjects from depth sensor data". The proposed task was created in order to verify the possibility of retrieving models of query human subjects from single shots of depth sensors, using shape information only. Depth acquisition of different subjects were realized under different illumination conditions, using different clothes and in three different poses. The resulting point clouds of the partial body shape acquisitions were segmented and coupled with the skeleton provided by the OpenNI software and provided to the participants together with derived triangulated meshes. No color information was provided. Retrieval scores of the different methods proposed were estimated on the submitted dissimilarity matrices and the influence of the different acquisition conditions on the algorithms were also analyzed. Results obtained by the participants and by the baseline methods demonstrated that the proposed task is, as expected, quite difficult, especially due the partiality of the shape information and the poor accuracy of the estimated skeleton, but give useful insights on potential strategies that can be applied in similar retrieval procedures and derived practical applications. Eurographics Proceedingsc 2016 The Eurographics Association. © Eurographics 2016. All rights reserved.

关键词： Musculoskeletal system

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Single breathhold, three-dimensional measurement of left atrial volume and function using sparse CINE CMR imaging with iterative reconstruction

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Journal of Cardiovascular Magnetic Resonance 2015年第SUPPL 1期17卷 Q35-Q35页

作者： Pierre Monney Orestis Vardoulis Davide Piccini Amit Bermano Amir Vaxman Craig Gotsman Janine Schwitter Michael O Zenge Michaela Schmidt Mariappan S Nadar Matthias Stuber Nikolaos Stergiopulos Juerg Schwitter Center for Cardiac Magnetic Resonance Cardiology University Hospital Lausanne (CHUV) Lausanne Switzerland Laboratory of Hemodynamics and Cardiovascular Technology Swiss Federal Institute of Technology Lausanne Switzerland Center for Biomedical Imaging (CIBM) University of Lausanne Lausanne Switzerland Advanced Clinical Imaging Technology Siemens Healthcare Lausanne Switzerland Center for Graphics and Geometric Computing Technion Haifa Israel Geometric Modelling and Industrial Geometry Vienna University of Technology Vienna Austria University of Fribourg Fribourg Switzerland Healthcare sector Siemens AG Erlangen Germany Imaging and Computer Vision Siemens Corporation Princeton NJ USA Radiology University Hospital Lausanne Lausanne Switzerland

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Realtime Performance-Based Facial Avatars for Immersive Gameplay 13

Realtime Performance-Based Facial Avatars for Immersive Game...

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Proceedings of Motion on Games

作者： Mark Pauly Computer Graphics and Geometry Laboratory EPFL

ISBN: (纸本)9781450325462

This paper discusses how realtime face tracking and performance-based animation can facilitate new ways of interaction for computer gaming and other online applications. We identify a number of requirements for realtime face capture and animation systems, and show how recent progress in tracking algorithms advances towards satisfying these requirements. Performance-based animation has the potential to significantly enrich the emotional experience of in-game communication through live avatars that are controlled directly by the facial expressions of a recorded user. We briefly outline other potential use scenarios of realtime face tracking systems and conclude with a discussion of future research challenges.

关键词： performance-based animation avatars realtime face tracking immersive gameplay

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Digital anastylosis of the Octagon in Ephesos

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Journal on Computing and Cultural Heritage 2009年第1期2卷 1–27页

作者： Thuswaldner, Barbara Flöry, Simon Kalasek, Robert Hofer, Michael Huang, Qi-Xing Thür, Hilke Institute of History and Theory of Architecture Historic Building Survey TU Vienna Karlsplatz 13 A-1040 Vienna Austria Geometric Modeling and Industrial Geometry TU Vienna Wiedner Haupstr. 8-10/104 A-1040 Vienna Austria Department of Spatial Development Infrastructure and Environmental Planning TU Vienna Operngasse 11 A-1040 Wien Austria Computer Graphics Laboratory Stanford University 353 Serra Mall Stanford CA 94305 United States Institute for Studies of Ancient Culture Austrian Academy of Sciences Bäckerstr. 13 A-1010 Vienna Austria

Anastylosis is the archaeological and architectural reconstruction of a ruined monument at the historic site after careful study of the remaining original elements. We present research results concerning 3D technologies that are used in the digital anastylosis of cultural heritage monuments. Based on current state-of-the-art research, we present 3D data collection, digital artifacts reconstruction, and digital reassembly of existing fragments illustrated by means of the Octagon monument in Ephesos, Turkey. Our focus is on methods that belong to geometry processing. © 2009 ACM.

关键词： Data acquisition

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Geometric modeling based on polygonal meshes

Geometric modeling based on polygonal meshes

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ACM SIGGRAPH 2007 - International Conference on computer graphics and Interactive Techniques

作者： Botsch, Mario Pauly, Mark Kobbelt, Leif Alliez, Pierre Levy, Bruno Bischoff, Stephan Rossl, Christian ETH Zurich Switzerland RWTH Aachen Germany INRIA Sophia-Antipolis France INRIA Lorraine France Computer Graphics Laboratory ETH Zurich Switzerland Applied Geometry Group ETH Zurich Switzerland INRIA Sophia-Antipolis GEOMETRICA BP 93 France Computer Graphics Group RWTH Aachen Germany INRIA Lorraine ALICE France

No abstract available

关键词： geometry

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Registration of point cloud data from a geometric optimization perspective 04

Registration of point cloud data from a geometric optimizati...

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2nd Symposium on geometry Processing, SGP 2004

作者： Mitra, Niloy J. Gelfand, Natasha Pottmann, Helmut Guibas, Leonidas Computer Graphics Laboratory Stanford University United States Geometric Modeling and Industrial Geometry Vienna University of Technology Austria

ISBN: (纸本)3905673134

We propose a framework for pairwise registration of shapes represented by point cloud data (PCD). We assume that the points are sampled from a surface and formulate the problem of aligning two PCDs as a minimization of the squared distance between the underlying surfaces. Local quadratic approximants of the squared distance function are used to develop a linear system whose solution gives the best aligning rigid transform for the given pair of point clouds. The rigid transform is applied and the linear system corresponding to the new orientation is build. This process is iterated until it converges. The point-to-point and the point-to-plane Iterated Closest Point (ICP) algorithms can be treated as special cases in this framework. Our algorithm can align PCDs even when they are placed far apart, and is experimentally found to be more stable than point-to-plane ICP. We analyze the convergence behavior of our algorithm and of point-to-point and point-to-plane ICP under our proposed framework, and derive bounds on their rate of convergence. We compare the stability and convergence properties of our algorithm with other registration algorithms on a variety of scanned data. © The Eurographics Association 2004.

关键词： Linear systems

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