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XIV Congreso Internacional de Interaccion Persona-Ordenador, INTERACCION 2013 - 14th International Congress on Human-computer Interaction, INTERACCION 2013

作者： Manresa-Yee, Cristina Amengual, Esperança Ponsa, Pere Computer Graphics Computer Vision and AI Group Mathematics and Computer Science Department University of Balearic Islands Crta. Valldemossa km 7.5 Palma07122 Spain EPSEVG School Automatic Control Department Barcelona Tech University Av. Víctor Balaguer 1 Vilanova I la Geltrú Spain

ISBN: (纸本)9788469583524

Vision-based interfaces can employ gestures to interact with an interactive system without touching it. Gestures are frequently modelled in laboratories, and usability testing should be carried out. However, often these interfaces present usability issues, and the great diversity of uses of these interfaces and the applications where they are used, makes it difficult to decide which factors to take into account in a usability test. In this paper, we review the literature to compile and analyze the usability factors and metrics used for vision-based interfaces. © 2013 Actas del XIV Congreso Internacional de Interaccion Persona-Ordenador, INTERACCION 2013. All rights reserved.

关键词： Evaluation Gestures Usability Vision-based interfaces

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Structure-aware shape processing 13

Structure-aware shape processing

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SIGGRAPH Asia 2013 Courses, SA 2013

作者： Mitra, Niloy J. Wand, Michael Zhang, Hao Cohen-Or, Daniel Kim, Vladimir Huang, Qi-Xing United Kingdom Max-Planck Institut Informatik Saarland University Germany Graphics Usability and Visualization Lab Simon Fraser University Canada TAU United States School of Computing Science United States Stanford Univ. United States Computer Science Department Princeton University United States Department Computer Science Stanford University United States

ISBN: (纸本)9781450326315

Shape structure is about the arrangement and relations between shape parts. Structure-aware shape processing goes beyond local geometry and low level processing, and analyzes and processes shapes at a high level. It focuses more on the global inter and intra semantic relations among the parts of shape rather than on their local geometry. With recent developments in easy shape acquisition, access to vast repositories of 3D models, and simple-to-use desktop fabrication possibilities, the study of structure in shapes has become a central research topic in shape analysis, editing, and modeling. A whole new line of structure-aware shape processing algorithms has emerged that base their operation on an attempt to understand such structure in shapes. The algorithms broadly consist of two key phases: an analysis phase, which extracts structural information from input data;and a (smart) processing phase, which utilizes the extracted information for exploration, editing, and synthesis of novel shapes. In this survey paper, we organize, summarize, and present the key concepts and methodological approaches towards efficient structure-aware shape processing. We discuss common models of structure, their implementation in terms of mathematical formalism and algorithms, and explain the key principles in the context of a number of state-of-the-art approaches. Further, we attempt to list the key open problems and challenges, both at the technical and at the conceptual level, to make it easier for new researchers to better explore and contribute to this topic. Our goal is to both give the practitioner an overview of available structure-aware shape processing techniques, as well as identify future research questions in this important, emerging, and fascinating research area.

关键词： Semantics

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Using a Serious Game Approach to Teach 'Operator Precedence' to Introductory Programming Students

Using a Serious Game Approach to Teach 'Operator Precedence'...

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International Conference on Information Visualisation (IV)

作者： Nicoletta Adamo-Villani Thomas Haley-Hermiz Robb Cutler Department of Computer Graphics Technology Purdue University West Lafayette IN USA Department of Computer Science Purdue University West Lafayette IN USA

In this paper we describe the design, development, formative evaluation and initial findings of one level of a serious game whose objective is to teach Information Assurance concepts to undergraduate students in introductory programming courses. The game level focuses on the concept of 'operator precedence'. The player travels through a multilevel 3- dimensional maze and at each junction in the maze he/she is required to solve a mathematical problem that involves the application of operator precedence rules. A correct answer allows the player to move closer to the maze exit, an incorrect solution moves the player farther from the end of the maze. Initial findings from a formative study with a group of 14 undergraduate students show that the game level is usable, engaging and useful for learning/reviewing the intended programming concept.

关键词： Games computers Programming profession Educational institutions Security

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On-Line Reconstruction of CAD Geometry

On-Line Reconstruction of CAD Geometry

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International Conference on 3D Imaging, Modeling, Processing, Visualization and Transmission (3DIMPVT)

作者： Klaus Denker Daniel Hagel Jakob Raible Georg Umlauf Bernd Hamann Computer Graphics Laboratory Department of Computer Science Konstanz University of Applied Sciences Konstanz Germany Institute for Data Analysis and Visualization Department of Computer Science University of California Davis CA USA

In reverse engineering and computer-aided design (CAD) applications point cloud data is usually manually scanned, reconstructed, and post-processed in separated steps. When point cloud data resulting from a scanning process do not satisfy certain necessary reconstruction requirements, one must perform scanning again to enable proper reconstruction. On-line reconstruction of 3d geometry allows one to generate and update a CAD reconstruction on-line during the scanning process with an hand-held laser scanner. Thus, regions where the scanned data is insufficient for the reconstruction are detected on the fly to allow an immediate correction and improvement of the scanned data. This enables the operator to focus on critical regions in the scanned data to improve the reconstruction quality. We present an on-line segmentation and on-line reconstruction of basic geometric primitives. The presented methods allow for a real-time processing of a point stream. They utilize data structures that can be updated at any time when additional data from the stream has to be processed. This data is used to complete and improve the segmentation and reconstruction during the scanning process.

关键词： Surface reconstruction Geometry Image reconstruction Shape Lasers Design automation Image segmentation

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Towards building web based augmented reality application for pre-school children

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Telkomnika - Indonesian Journal of Electrical Engineering 2013年第6期11卷 3134-3141页

作者： Tekkesinoglu, Sule Sunar, Mohd Shahrizal Yusof, Cik Suhaimi Department of Computer Graphics and Multimedia Faculty of Computer Science and Information System Universiti Teknologi Malaysia 81310 Skudai Johor Malaysia

The goal of this work is to present a concept for web based Augmented Reality. We have many examples of Augmented Reality systems in different field from military applications to medical applications, from entertainment to manufacturing. In this paper we worked on how virtual environments can be combined with web based applications. Internet users need web sites for many reasons in daily life. On the other hand, Augmented Reality is one of the popular fields on virtual environment technologies that it would be useful to associate these two technologies. In this study JavaScript were used as main language to build Augmented Reality application supported by three different libraries each with a specific role. The libraries which are used through coding are Flartoolkit, Papervision3D, and Flex SDK. The outcome of this combined algorithms shows that the method is accomplished web based Augmented Reality for preschool children to provide educators a way to teach students with deeper, and more meaningful experiences in the academy. © 2013 Universitas Ahmad Dahlan.

关键词： Augmented reality

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GPU-ASIFT: A fast fully affine-invariant feature extraction algorithm

GPU-ASIFT: A fast fully affine-invariant feature extraction ...

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International Conference on High Performance Computing & Simulation (HPCS)

作者： Valeriu Codreanu Feng Dong Baoquan Liu Jos B.T.M. Roerdink David Williams Po Yang Burhan Yasar Scientific Visualization and Computer Graphics Groningen Netherlands Scientific Visualization and Computer Graphics Rijksuniversiteit Groningen Groningen The Netherlands Department of Computer Science and Technology University of Bedfordshire Bedfordshire UK Rotasoft Inc. Turkey

This paper presents a method that takes advantage of powerful graphics hardware to obtain fully affine-invariant image feature detection and matching. The chosen approach is the accurate, but also very computationally expensive, ASIFT algorithm. We have created a CUDA version of this algorithm that is up to 70 times faster than the original implementation, while keeping the algorithm's accuracy close to that of ASIFT. It's matching performance is therefore much better than that of other non-fully affine-invariant algorithms. Also, this approach was adapted to fit the multi-GPU paradigm in order to assess the acceleration potential from modern GPU clusters.

关键词： graphics processing units Feature extraction Kernel Mathematical model Instruction sets Hardware Accuracy

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Missing data estimation in multi-biometric identification and verification

Missing data estimation in multi-biometric identification an...

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IEEE Workshop on Biometric Measurements and Systems for Security and Medical Applications (BIOMS)

作者： Naser Damer Benedikt Führer Arjan Kuijper Fraunhofer Institute for Computer Graphics Research (IGD) Darmstadt Germany Department of Computer Science Technische Universität Darmstadt Darmstadt Germany

In the practical use of multi-biometric solutions, biometric sources involved in producing the verification or identification decision do occasionally fail to produce results. This work discusses solutions for missing data in multi-biometric score-level fusion. A missing data estimation solution based on support vector regression was presented in this work and compared to four baseline solutions. The evaluation was carried under both the verification and the identification scenarios in an effort to show the effect of missing data estimation on the relatively understudied multi-biometric identification scenario. Evaluation was performed on the Biosecure DS2 score database and satisfying performance was achieved under both biometric scenarios.

关键词： Estimation Databases Support vector machines Face Electronic mail Training Receivers

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Preface

Proceedings of the 11th European Conference on Games Based L...

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Proceedings of the 11th European Conference on Games Based Learning, ECGBL 2017 2017年 viii-x页

作者： Pivec, Maja Gründler, Josef Admiraal, Wilfried Alemi, Minoo All, Anissa Almeida, Ana Amresh, Ashish Arnab, Sylvester Ask, Kristine Avouris, Nikolaos Awwal, Nafisa Hauge, Jannicke Baalsrud Badau, Dana Barata, Ana Barendregt, Wolmet Basaiawmoit, Rajiv Bellotti, Francesco Blanchfield, Peter Borit, Melania Boskic, Natasha Boyle, Liz Brady, Mairead Bratitsis, Tharrenos Brinch, Sara Brom, Cyril Brooks, Anthony Brown, David Brox, Ellen Busch, Carsten Caldeira, Carlos Callies, Sophie Cardoso, Tiago Carron, Thibault Casimir, Rommert De Castro, António Vieira Chang, Maiga Charalambis, Dimitris Charles, Darryl Charlier, Nathalie Chee, Yam San Chen, Ming-Puu Chiarello, Fabio Connolly, Thomas Crockett, Larry Darwish, Tamer Sigurdardottir, Helga Deliyannis, Ioannis Demirbilek, Muhammet Sigurdardottir, Helga Dis Duin, Heiko Dyer, Ronald Edgar, David Ejsing-Duun, Stine Escudeiro, Paula Felicia, Patrick Fesakis, Georgios Figueira, Ana Paula Fotaris, Panagiotis Fujimoto, Toru George, Sebastien Georgiadis, Panagiotis Gerodetti, Natalia Giannakoulopoulos, Andreas Gjedde, Lisa Goebel, Stefan Gomez-Martin, Pedro Pablo Gouscos, Dimitris Grigoriadou, Maria Guralnick, David Guttormsgaard, Vibeke Habgood, Jacob Hainey, O. Hanghoj, Thorkild Hawlitschek, Anja Hemben, Terseer Hlavacs, Helmut Hommedal, Silje Hole Hollins, Paul Idrus, Rozhan Wang, Alf Inge Ismail, Marina Jans, Ruben Juzeleniene, Saule Kalavassis, Fragiskos Kalogiannakis, Michail Karakostas, Anastasios Katzlinger-Felhofer, Elisabeth Ketamo, Harri Ketelhut, Diane Jass Kickmeier-Rust, Michael Kiili, Kristian Koeppen, Veit Kolås, Line Kordaki, Maria Korkut, Safak Kourti, Evangelia Li, Ken Lukosch, Heide MaCleod, Hamish Magnussen, Rikke Majgaard, Gunver Marchetti, Emanuela Marques, Bertil Marty, Jean-Charles Marzantowicz, Lukasz Mehm, Florian Meimaris, Michail Michel, Christine Moffat, David Montero-Fleta, Begoña Moseley, Alexander Mota, Dulce Mozelius, Peter Nadolski, Rob Nelson, Brian Neville, Karen Ng, Annie W.Y. Nixon, Darren Nocchi, Susanna Broin, Daire O. O'Mullane, John Skev Leiden University Leiden Netherlands Sharif University of Technology Iran IMinds-MICT-Ghent University Belgi Belgium Universidade de Coimbra Portugal Arizona State University United States Coventry University United Kingdom Norway University of Patras Greece University of Melbourne Australia Bremer Institut for Produktion und Logistik Germany University of Medicine and Pharmacy of Targu Mures Romania Portugal Gothenburg University Department of Applied IT Sweden Aarhus University Denmark University of Genoa Italy School of Computer Science University of Nottingham United Kingdom UiT - The Arctic Univeristy of Norway University of Troms Norway University of British Columbia Canada Univesity of the West of Scotland United Kingdom Open University of Cyprus Greece ESCP Europe France Trinity College Dublin Ireland University of Western Macedonia Greece KDU University College Malaysia Charles University Prague Czech Republic Aalborg University Denmark Nottingham Trent University United Kingdom Nord-Trøndelag University College Steinkjer Norway University of Applied Sciences HTW-Berlin Germany University of Evora Portugal UQAM Canada Universidade Nova de Lisboa Portugal LIP6 - Paris Université de Savoie France Tilburg University Netherlands Open University of the Natherlands Nederland United States Athabasca University Canada University of Athens Greece University of Ulster United Kingdom Catholic University of Leuven Belgium Nanyang Technological University Singapore Singapore National Taiwan Normal University Taiwan Italy University of West of Scotland United Kingdom Augsburg College United States Brunel University United Kingdom Ionian University Greece Suleyman Demirel University Turkey Glamorgan University United Kingdom BIBA - Bremer Institut for Produktion und Logistik GmbH Germany Managment School University of Liverpool United Kingdom Glasgow Caledonian University United Kingdom Aalborg Univ. Copenhagen Denmark Portugal Waterford Institute of

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Optimization of ultrasonic imaging using persistence and filter technology

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2013 2nd International Conference on Materials science and Technology, ICMST 2013

作者： Guo, De Quan Yang, Hong Yu Zhang, Cong Yao Liu, Dong C. Key Laboratory of Fundamental Synthetic Vision Graphics and Image Science for National Defense Sichuan University Sichuan Province China Department of Machinery Engineering Neijiang Vocational and Technical College Neijiang China College of Computer Science Sichuan University Sichuan Province China

ISBN: (纸本)9783037857137

B-mode ultrasonic images are often pervaded by the electronics noise and speckle artifact, which may make the interpretation of medical images difficult. In this paper, a legible method for ultrasonic image is constructed and it can be effective to suppress the noise and improve the images quality. Dynamic persistence technology based on temporal multi-frames is utilized to smooth the electronics noise and even lower speckle artifact. To reduce computing complexity, a sum table method and conjugate direction search approaches are applied to speed up estimation of motion vector. The guided image filter strategy is used to enhance the contrast and detail resolution for the processed image by persistence. Experimental results show that the proposed method is effective to smooth noise and enhance contrast of ultrasound image in vivo. © (2013) Trans Tech Publications, Switzerland.

关键词： Ultrasonic imaging

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High-resolution contrast enhanced multi-phase hepatic Computed Tomography data fromaporcine Radio-Frequency Ablation study

High-resolution contrast enhanced multi-phase hepatic Comput...

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IEEE International Symposium on Biomedical Imaging

作者： Bernhard Kainz Philip Voglreiter Michael Sereinigg Iris Wiederstein-Grasser Ursula Mayrhauser Sonja Köstenbauer Mika Pollari Rostislav Khlebnikov Matthias Seise Tuomas Alhonnoro Yrjö Häme Daniel Seider Ronan Flanagan Claire Bost Judith Mühl David O'Neill Tingying Peng Stephen Payne Daniel Rueckert Dieter Schmalstieg Michael Moche Marina Kolesnik Philipp Stiegler Rupert H. Portugaller Department of Computing Imperial College London UK Institute for Computer Graphics and Vision (ICG) Graz University of Technology AUT Department for Surgery Medical University Graz AUT Division of Biomedical Research and Section for Surgical Research Medical University Graz AUT Medizinische Universitat Graz Graz Steiermark AT Department of Biomedical Engineering and Computational Science Aalto University FI Schloss Birlinghoven Fraunhofer Institute for Applied Information Technology GER Department of Diagnostic and Interventional Radiology Leipzig University Hospital Leipzig GER NUMA Engineering Services Ltd. Dundalk Co. Louth IRE Department of Engineering Science Keble College Oxford UK University Clinic of Radiology Medical University Graz AUT

Data below 1 mm voxel size is getting more and more common in the clinical practice but it is still hard to obtain a consistent collection of such datasets for medical image processing research. With this paper we provide a large collection of Contrast Enhanced (CE) Computed Tomography (CT) data from porcine animal experiments and describe their acquisition procedure and peculiarities. We have acquired three CE-CT phases at the highest available scanner resolution of 57 porcine livers during induced respiratory arrest. These phases capture contrast enhanced hepatic arteries, portal venous veins and hepatic veins. Therefore, we provide scan data that allows for a highly accurate reconstruction of hepatic vessel trees. Several datasets have been acquired during Radio-Frequency Ablation (RFA) experiments. Hence, many datasets show also artificially induced hepatic lesions, which can be used for the evaluation of structure detection methods.

关键词： Lesions Computed tomography Veins Biomedical imaging Animals Liver Educational institutions

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