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IEEE International Workshop on Robot and Human Communication (ROMAN)

作者： Sang-Youn Kim Segil Park Dong-Soo Kwon Jinah Park Interactive Virtual Reality Laboratory Korea University of Technology and Education Cheonan South Korea School of Engineering ICU Computer Graphics and Visualization Laboratory Daejeon South Korea Department of Mechanical Engineering Telerobotics & Control Laboratory KAIST Daejeon South Korea

In interacting with a soft object, both visual and haptic senses play major role in providing the characteristics of the object. While visual feedback comes from the appearance of the overall shape, haptic feedback comes largely from the localized internal composition. However, it has been a common practice to represent the object with one model for both processing shape de formation and computing the feedback force, making it much challenging work to achieve real-time simulation of a soft and especially non-homogeneous object. In this paper, we claim that it may be sufficient to represent the graphical visual model as a surface model whereas it is necessary to represent the haptic model as a volumetric model. We propose, therefore, a hybrid model where volumetric haptic model and surface graphical model coexist. For constructing hybrid model, we employ S-chain model to compute the haptic behavior and mass-spring model to calculate graphic behavior. We conduct experiments with volumetric human liver model at a haptic update rate of 1000 Hz and graphic update rate of 30 Hz. The experimental results show that our proposed model satisfies the real-time performance and provides the realistic sense to be useful for a virtual reality application.

关键词： Haptic interfaces graphics Virtual environment Shape Force feedback Computational modeling Graphical models Humans Liver Virtual reality

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Motion Analysis of Endovascular Stent-Grafts by MDL Based Registration

Motion Analysis of Endovascular Stent-Grafts by MDL Based Re...

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International Conference on computer Vision (ICCV)

作者： Georg Langs Nikos Paragios Rene Donner Pascal Desgranges Alain Rahmouni Hicham Kobeiter GALEN Group Laboratoire de Mathématiques Appliquées aux Systàmes Ecole Centrale de Paris France Institute for Computer Graphics and Vision Graz University of Technology Austria Pattern Recognition and Image Processing Group University of Technology Vienna Austria University of Paris XII Paris France

The endovascular repair of a traumatic rupture of the thoracic aorta - that would otherwise lead to the death of the patient - is performed by delivering a stent-graft into the vessel at the rupture location. The age range of the affected patients is large and the stent-graft will stay in the body for the remaining life. The technique is relatively new, and no experience with regard to long-term effects, and durability exists. To predict long-term complications, such as ruptures or destructive interactions with surrounding tissue during the life of the patient, it is important to understand the - rather intense and constant - movement of the stent- graft during the cardiac cycle. A computed tomography with heart gating (gated CT) acquires sequences that show the region of the stent-graft at different time points. We analyze the motion of stent-grafts with a model based approach. Stent-grafts are represented as sparse sets of axis points extracted from the gated CT, and motion patterns are captured by a minimum description length based group-wise registration of the stent-graft at different time points. No parameterization or a priori definition of the topology is necessary, and highly variable elasticity properties in the data volume can by accounted for by the sparse statistical model, that captures correlations and motion components of the stent-graft. We report results for deformation models and registration accuracy for 5 patients.

关键词： Motion analysis Computed tomography Biomedical imaging Heart Buildings computer graphics Pattern recognition Image processing Hospitals Data mining

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The self-paced graz brain-computer interface: Methods and applications

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Computational Intelligence and Neuroscience 2007年第unknown期2007卷 1-9页

作者： Scherer, Reinhold Schloegl, Alois Lee, Felix Bischof, Horst Janša, Janez Pfurtscheller, Gert Laboratory of Brain-Computer Interfaces Institute for Knowledge Discovery Graz University of Technology 8010 Graz Krenngasse 37 Austria NeuroCenter Styria Graz 8010 Krenngasse 37/I Austria Intelligent Data Analysis Group Fraunhofer-Institut für Rechnerarchitektur und Softwaretechnik FIRST 12489 Berlin Kekulestrasse 7 Germany Institute for Computer Graphics and Vision Graz University of Technology 8010 Graz Inffeldgasse 16 Austria Aksioma - Institute for Contemporary Art 1000 Ljubljana Neubergerjeva 25 Slovenia

We present the self-paced 3-class Graz brain-computer interface (BCI) which is based on the detection of sensorimotor electroencephalogram (EEG) rhythms induced by motor imagery. Self-paced operation means that the BCI is able to determine whether the ongoing brain activity is intended as control signal (intentional control) or not (non-control state). The presented system is able to automatically reduce electrooculogram (EOG) artifacts, to detect electromyographic (EMG) activity, and uses only three bipolar EEG channels. Two applications are presented: the freeSpace virtual environment (VE) and the Brainloop interface. The freeSpace is a computer-game-like application where subjects have to navigate through the environment and collect coins by autonomously selecting navigation commands. Three subjects participated in these feedback experiments and each learned to navigate through the VE and collect coins. Two out of the three succeeded in collecting all three coins. The Brainloop interface provides an interface between the Graz-BCI and Google Earth.

关键词： .virtual environment coins brain activity bipolar navigation commands motor imagery Graz Austria EOG EEG channels Self-paced operation freeSpace Brainloop

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Modeling art history: Exploring Edward Hopper's Nighthawks outside and ...IN! 06

Modeling art history: Exploring Edward Hopper's Nighthawks o...

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ACM SIGGRAPH 2006 Educators Program - International Conference on computer graphics and Interactive Techniques

作者： Finnegan, John Kopp, Richard Augustine, Carley Banik, Jerry Carver, Adam Rajski, Chad Lehman, Randy Amick, Lisa Computer Graphics Technolgy Computer Graphics Technolgy Purdue University College of Technology New Albany Computer Graphics Technolgy Purdue University College of Technology South Bend Purdue University College of Technology South Bend

ISBN: (纸本)1595933646

How can teachers get students to explore art and art related fields and have or learn the process of critical analysis and critical thinking in an educational curriculum that is heavy on the engineering and technology courses? Inevitably these students are asked to be artistic and to have knowledge of disciplines outside computer graphics technology. Indeed, they will seek employment in the entertainment industry, where they will work on films that have an artistic, literary and historical component. Additionally, how can we expose them to the working methodologies of group or collaborative learning while still advancing their knowledge base in computer graphics-specifically three dimensional modeling, texturing and lighting. This paper outlines and describes one approach that is immersive in the outside disciplines while still utilizing the tools of computer graphics to solve the visual problem. It also contains the collaborative learning elements and critical thinking components that students need to be successful in these endeavors.

关键词： Teaching

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CURVATURE VIEW BASED SKULL MULTIRESOLUTION FEATURE REPRESENTATION AND RECOGNITION

CURVATURE VIEW BASED SKULL MULTIRESOLUTION FEATURE REPRESENT...

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2007 International Conference on Wavelet Analysis and Pattern Recognition (ICWAPR 2007), vol.4

作者： WEN-BIN ZHAO YAN-NING ZHANG FU-ZENG YANG ZHOU TAO Biomedical engineering department of northwestern Polytechnic university Xi'an China Shaanxi province computer graphics key lab Computer college of NorthWestern polytechnical university Xi'an China Northwest Agriculture and Forestry University Yanglin China Shaanxi University of Technology Hanzhong China

An approach of curvature view based is presented for skull surface feature representation and recognition. The curvature information of skull surface is transformed into curvature color image, then the image projection used as skull feature is constructed by Radon transformation from many orientation, finally wavelet function is applied to decompose the skull projection signal. Experiment show that this method is effective between tiny different skull shape.

关键词： Discrete curvature Wavelet Skull Biometrics

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Teaching strategies and assessment measures for rapidly changing technology programs 06

Teaching strategies and assessment measures for rapidly chan...

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ACM SIGGRAPH 2006 Educators Program - International Conference on computer graphics and Interactive Techniques

作者： Whittington, Jana Nankivell, Kim. J. Department of Computer Graphics Technology Purdue University Calumet

ISBN: (纸本)1595933646

technology changes rapidly in the computer graphics field and the faculty find themselves continually updating and changing their courses to keep step with current changes in the technology, both in hardware and software. Course consistency in the form of learning objectives and outcomes is an important assessment measure. Many problems can arise in assessment while keeping up with the technology, to the point where some assessment measures may become obsolete. In response to that, this paper will explore a number of questions that deal with the issue of rapidly changing technology within the learning situation along with assessing a program in this type of environment. Additionally, this paper will address a number of questions including: How does an educator keep up, and what is the significance in teaching the "old" technology verses the "new" or "upgraded" technology? How do educators assess student success? How does an educator assess the technology skill level and set a base for continued course assessment throughout a degree program? This paper will also explore the possibilities of setting up accreditation options to prepare for future computer graphics accreditation.

关键词： computer graphics

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On-line boosting and vision

On-line boosting and vision

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2006 IEEE computer Society Conference on computer Vision and Pattern Recognition, CVPR 2006

作者： Grabner, Helmut Bischof, Horst Institute for Computer Graphics and Vision Graz University of Technology

ISBN: (纸本)0769525970

Boosting has become very popular in computer vision, showing impressive performance in detection and recognition tasks. Mainly off-line training methods have been used, which implies that all training data has to be a priori given;training and usage of the classifier are separate steps. Training the classifier on-line and incrementally as new data becomes available has several advantages and opens new areas of application for boosting in computer vision. In this paper we propose a novel on-line AdaBoost feature selection method. In conjunction with efficient feature extraction methods the method is real time capable. We demonstrate the multifariousness of the method on such diverse tasks as learning complex background models, visual tracking and object detection. All approaches benefit significantly by the on-line training. © 2006 IEEE.

关键词： Online systems

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A hybrid user interface for manipulation of volumetric medical data

A hybrid user interface for manipulation of volumetric medic...

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IEEE Virtual Reality 2006

作者： Bornik, Alexander Beichel, Reinhard Kruijff, Ernst Reitinger, Bernhard Schmalstieg, Dieter Institute for Computer Graphics and Vision Graz University of Technology

ISBN: (纸本)1424402247

This paper presents a novel system for interactive visualization and manipulation of medical datasets for surgery planning based on a hybrid VR / Tablet PC user interface. The goal of the system is to facilitate efficient visual inspection and correction of surface models generated by automated segmentation algorithms based on x-ray computed tomography scans, needed for planning surgical interventions. Factors like the quality of the visualization, nature of the dataset and interaction efficiency strongly influence system design decisions, in particular the design of the user interface, input devices and interaction techniques, leading to a hybrid setup. Finally, a user study is presented, which characterizes the system in terms of method efficiency and usability. © 2006 IEEE.

关键词： Data privacy

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Efficient Maximally Stable Extremal Region (MSER) tracking

Efficient Maximally Stable Extremal Region (MSER) tracking

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2006 IEEE computer Society Conference on computer Vision and Pattern Recognition, CVPR 2006

作者： Donoser, Michael Bischof, Horst Institute for Computer Graphics and Vision Graz University of Technology

ISBN: (纸本)0769525970

This paper introduces a tracking method for the well known local MSER (Maximally Stable Extremal Region) detector. The component tree is used as an efficient data structure, which allows the calculation of MSERs in quasi-linear time. It is demonstrated that the tree is able to manage the required data for tracking. We show that by means of MSER tracking the computational time for the detection of single MSERs can be improved by a factor of 4 to 10. Using a weighted feature vector for data association improves the tracking stability. Furthermore, the component tree enables backward tracking which further improves the robustness. The novel MSER tracking algorithm is evaluated on a variety of scenes. In addition, we demonstrate three different applications, tracking of license plates, faces and fibers in paper, showing in all three scenarios improved speed and stability. © 2006 IEEE.

关键词： Pattern recognition

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A study on textures and their perceptual visual dimensions as application for flexible and effective scientific visualization

A study on textures and their perceptual visual dimensions a...

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4th Eurographics Italian Chapter Conference 2006

作者： Taponecco, F. Computer Graphics Group Department of Computer Science Darmstadt University of Technology Germany

ISBN: (纸本)3905673584

The use of textures is fundamental in several areas of computer graphics, computer Vision and Image Processing. In this work, we focus on their main relevant attributes, in order to define and design textures as effective visual representations for use in scientific visualization. We concentrate on the problem of visualizing complex multivariate and multi-dimensional datasets as well as in synthesizing multi-fields and temporal evolution of vectorial datasets visualization. Textures features, such as directionality, color and shape are particularly suited for use in a synthesis algorithm, and they serve as effective seed primitives, which can incorporate many visual dimensions for intuitive and flexible data mapping and encoding. As special application, we propose a level-based visualization approach, with a special focus on systematic layering of information for scientific datasets. © 2006 The Eurographics Association.

关键词： Visualization

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