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15th Eurographics Conference on Visualization, EuroVis 2013

作者： Karimov, A. Mistelbauer, G. Schmidt, J. Mindek, P. Schmidt, E. Sharipov, T. Bruckner, S. Gröller, E. Institute of Computer Graphics and Algorithms Vienna University of Technology Vienna Austria Stockerau Regional Hospital Stockerau Austria Republican Clinical Hospital of G. G. Kuvatov Ufa Russia Department of Informatics University of Bergen Bergen Norway

Volume segmentation is important in many applications, particularly in the medical domain. Most segmentation techniques, however, work fully automatically only in very restricted scenarios and cumbersome manual editing of the results is a common task. In this paper, we introduce a novel approach for the editing of segmentation results. Our method exploits structural features of the segmented object to enable intuitive and robust correction and verification. We demonstrate that our new approach can significantly increase the segmentation quality even in difficult cases such as in the presence of severe pathologies. © 2013 The Author(s).

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Penny: An extremely low-cost pressure-sensitive stylus for existing capacitive touchscreens 13th

Penny: An extremely low-cost pressure-sensitive stylus for e...

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13th International conference on New Interfaces for Musical Expression, NIME 2013

作者： Wang, Johnty D’alessandro, Nicolas Pon, Aura Fels, Sidney Media and Graphics Interdisciplinary Centre University of British Columbia VancouverBC Canada numediart Institute for New Media Art Technology University of Mons MonsB-7000 Belgium Interactions Lab Depts. of Music and Computer Science University of Calgary CalgaryAB Canada Electrical and Computer Engineering & MAGIC University of British Columbia VancouverBC Canada

By building a wired passive stylus we have added pressure sensitivity to existing capacitive touch screen devices for less than $10 in materials, about 1/10th the cost of existing solutions. The stylus makes use of the built-in audio interface that is available on most smartphones and tablets on the market today. Limitations of the device include the physical constraint of wires, the occupation of one audio input and output channel, and increased latency equal to the period of at least one audio buffer duration. The stylus has been demonstrated in two NIME applications thus far: a visual musical score drawing and a singing synthesis application. © 2013, Steering Committee of the International Conference on New Interfaces for Musical Expression. All rights reserved.

关键词： Touch screens

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One-shot learning of anatomical structure localization models

One-shot learning of anatomical structure localization model...

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IEEE International Symposium on Biomedical Imaging

作者： René Donner Horst Bischof Computational Imaging and Radiology Lab Department of Radiodiagnostics Medical University of Vienna Austria Institute for Computer Graphics and Vision Graz University of Technology Austria

ISBN: (纸本)9781467364560

We propose an approach which allows to localize anatomical landmarks in radiological datasets given only a single manual annotation and set of un-annotated example images. Using top-down image patch regression to obtain potential landmark candidates in the set of training images, a model of the anatomical structure is incrementally enlarged, starting from the single, annotated image, until it encompasses the entire training set. The obtained model then allows to perform highly accurate anatomical structure localization on test data. We report preliminary results on a set of 2D radio-graphs, with a median/mean localization residual of 0.92 mm/1.30 mm. The approach yields very promising localization results, suggesting that is possible to eliminate the tedious manual annotation process still required by state of the art localization approaches.

关键词： Manuals Training Anatomical structure Dictionaries Shape Training data

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An Interactive Virtual Environment for Teaching "Triangulations and Coordinates Calculations" to Surveying Students

An Interactive Virtual Environment for Teaching "Triangulati...

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International Conference on Information Visualisation (IV)

作者： Hazar Dib Nicoletta Adamo-Villani Stephen Garver Department of Building Construction Management Purdue University West Lafayette IN USA Department of Computer Graphics Technology Purdue University West Lafayette IN USA

This paper presents ongoing research aimed at improving surveying education through the use of virtual environments. Teaching surveying presents several challenges such as low student competence in mathematics, geometry and trigonometry, limited student access to instruments, limited availability of terrains on which to practice, dependency on weather conditions, and more. Prior research suggests that surveying education can be significantly improved with the use of digital teaching aids and virtual instruments. The goal of the work reported in the paper is to enhance traditional surveying instruction methods with a unique approach: an interactive Virtual Learning Environment (VLE) that supports students' mathematical representational fluency and includes realistic virtual terrains and surveying instruments that look, operate, and produce results comparable to the physical ones. The VLE is aimed at undergraduate students enrolled in Civil Engineering, Architecture and Building Construction Management programs and includes 5 educational modules, in this paper we describe the design, development and initial evaluation of the "Triangulations and Coordinates Calculations" module.

关键词： Instruments Educational institutions Three-dimensional displays Geometry Usability Virtual environments

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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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Edit Propagation via Edge-Aware Filtering

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Journal of computer Science & technology 2012年第4期27卷 830-840页

作者：胡伟董朝袁国栋 Department of Computer Science and Technology Beijing University of Chemical Technology Program of Computer Graphics Cornell University Department of Computer Science and Technology Tsinghua University

This paper presents a novel framework for efficiently propagating the stroke-based user edits to the regions with similar colors and locations in high resolution images and videos. Our framework is based on the key observation that the edit propagation intrinsically can also be achieved by utilizing recently proposed edge-preserving filters. Therefore, instead of adopting the traditional global optimization which may involve a time-consuming solution, our algorithm propagates edits with the aid of the edge-preserve filters. Such a propagation scheme has low computational complexity and supports multiple kinds of strokes for more flexible user interactions. Further, our method can be easily and efficiently implemented in GPU. The experimental results demonstrate the efficiency and user-friendliness of our approach.

关键词： edit propagation edge-aware domain transform guided filter

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Nonlinear Federated Filtering

Nonlinear Federated Filtering

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International Conference on Information Fusion

作者： Benjamin Noack Simon J. Julier Marc Reinhardt Uwe D. Hanebeck Intelligent Sensor-Actuator-Systems Laboratory (ISAS) Institute for Anthropomatics Karlsruhe Institute of Technology (KIT) Virtual Environments and Computer Graphics Group (VECG) Department of Computer Science University College London (UCL)

ISBN: (纸本)9781479902842

The federated Kalman filter embodies an efficient and easy-to-implement solution for linear distributed estimation problems. Data from independent sensors can be processed locally and in parallel on different nodes without running the risk of erroneously ignoring possible dependencies. The underlying idea is to counteract the common process noise issue by inflating the joint process noise matrix. In this paper, the same trick is generalized to nonlinear models and non-Gaussian process noise. The probability density of the joint process noise is split into an exponential mixture of transition densities. By this means, the process noise is modeled to independently affect the local system models. The estimation results provided by the sensor devices can then be fused, just as if they were indeed independent.

关键词： Federated Kalman Filter Nonlinear Estimation Distributed Estimation

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Using Optimized Virtual Network Embedding for Network Dimensioning

Using Optimized Virtual Network Embedding for Network Dimens...

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International Conference and Workshops on Networked Systems (NetSys)

作者： Johannes Inführ David Stezenbach Matthias Hartmann Kurt Tutschku Günther R. Raidl Institute of Computer Graphics and Algorithms Vienna University of Technology Austria Chair of Future Communication University of Vienna Austria Chair of Communication Networks University of Wuerzburg Germany

Virtual Network Embedding will be one of the key concepts of the Future Internet. For an ISP it is important to know how many additional Virtual Networks (VNs) of a specific application (e.g. web, streaming, P2P, and VoIP) are mappable into the current resource substrate with a certain probability. In this work we calculate this probability with our embedding algorithm which enables us to consider side effects based on remapping of VNs (e.g. due to reduced link delay). Our results show that minimal extra resources can significantly increase embedding probability of additional VNs.

关键词： Substrates Delays Routing Bandwidth Peer-to-peer computing Educational institutions Optimization

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The 2nd competition on counter measures to 2D face spoofing attacks

The 2nd competition on counter measures to 2D face spoofing ...

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6th IAPR International Conference on Biometrics, ICB 2013

作者： Chingovska, I. Yang, J. Lei, Z. Yi, D. Li, S.Z. Kahm, O. Glaser, C. Darner, N. Kuijper, A. Nouak, A. Komulainen, J. Pereira, T. Gupta, S. Khandel Wa, S. Bansal, S. Rai, A. Krishna, T. Goyal, D. Waris, M.-A. Zhang, H. Ahmad, I. Kiranyaz, S. Gabbouj, M. Tronci, R. Pili, M. Sirena, N. Roli, F. Galbally, J. Ficrrcz, J. Pinto, A. Pedrini, H. Schwartz, W.S. Rocha, A. Anjos, A. Marcel, S. Idiap Research Institute Switzerland Chinese Academy of Sciences China Fraunhofer Institute for Computer Graphics Research IGD Germany University of Oulu Finland University of Campinas Brazil CPqD Telecom and IT Solutions Brazil LNM Institute of Information Technology India Tampere University of Technology Finland University of Cagliari Italy Universidad Autonoma de Madrid Spain Universidade Federal de Minas Gerais Brazil

ISBN: (纸本)9781479903108

As a crucial security problem, anti-spoofing in biomet-rics, and particularly for the face modality, has achieved great progress in the recent years. Still, new threats arrive in form of better, more realistic and more sophisticated spoofing attacks. The objective of the 2nd Competition on Counter Measures to 2D Face Spoofing Attacks is to challenge researchers to create counter measures effectively detecting a variety of attacks. The submitted propositions are evaluated on the Replay-Attack database and the achieved results are presented in this © 2013 IEEE.

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Burnar: Involuntary heat sensations in augmented reality

Burnar: Involuntary heat sensations in augmented reality

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IEEE Annual International Symposium Virtual Reality

作者： Peter Weir Christian Sandor Matt Swoboda Thanh Nguyen Ulrich Eck Gerhard Reitmayr Arindam Day Magic Vision Lab University of South Australia Adelaide Australia Fairlight UK Institute of Computer Graphics and Vision Graz University of Technology Graz Austria University of South Australia Adelaide SA AU

Augmented Reality systems that run interactively and in real time, using high quality graphical displays and sensational cues, can create the illusion of virtual objects appearing to be real. This paper presents the design, implementation, and evaluation of BurnAR, a novel demonstration which enables users to experience the illusion of seeing their own hands burning, which we achieve by overlaying virtual flames and smoke on their hands. Surprisingly, some users reported an involuntary warming sensation of their hands. Based on these comments, we hypothesized that stimulation of multiple sensory modalities presented in this AR environment can induce an involuntary experience in an additional sensory pathway: observation of virtual flames resulting in a heat sensation. This cross-modal transfer, known as virtual synesthesia, is a temporary experience which affects some people who are not synesthetes and only lasts for a short time during the illusory experience. To verify our hypothesis, we conducted an exploratory study where participants experienced the BurnAR demonstration under controlled conditions.

关键词： Heating Visualization Virtual environments Three-dimensional displays Augmented reality Streaming media

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