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IEEE International Conference on Image Processing

作者： Lorenzo Sorgi Italian AeroSpace Research Centre Computer Vision and Virtual Reality Lab CIRA Capua Caserta Italy

The paper presents the applicability of the Rodrigues Rotation Formula (RRF) in the context of Two-Views Geometry estimation. The Epipolar Constraint is usually formulated as the belonging of an image point to its corresponding Epipolar Line, instead using the RRF we will arrange the same constraint in terms of equivalence between 3D unit-norm vectors. This alternative formulation generates a geometrically meaningful error measure, which according to the presented results, provides a significant improvement of the estimation accuracy with respect to the widely used Sampson error, still maintaining a comparable computational cost.

关键词： Geometry Vectors Cameras Three dimensional displays Measurement uncertainty Estimation Minimization

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Image focusing using Gauss-Laguerre circular harmonic filters

Image focusing using Gauss-Laguerre circular harmonic filter...

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IEEE GRSS and ISPRS Joint Urban Remote Sensing Event, JURSE 2011

作者： Cimminiello, Nicola Sorgi, Lorenzo Verdoliva, Luisa Euro.Soft s.r.l. Napoli Italy Computer Vision and Virtual Reality Lab. Italian Aerospace Research Centre Capua Italy Dept. Electrical Eng. Un. Federico II Napoli Italy

ISBN: (纸本)9781424486571

This paper presents a novel technique to measure the focus accuracy of an imaging system, by maximizing the energy captured by a bank of Gauss-Laguerre Circular Harmonic Filters (GL-CHFs). These indeed, provide a powerful tool to select and track a set of Focus Control Points (FCPs), over which a robust measure of the overall focus quality of the image can be computed. We will provide an experimental evidence that the proposed focus measure is monotonic and unimodal with respect to image blur and will present a comparative analysis against the most common algorithms available at the state of the art. The obtained results will show that the proposed technique is able to cope with highly noisy sensors, providing a valuable solution for the real time passive calibration of the optical payloads of Earth Observation systems. © 2011 IEEE.

关键词： Bandpass filters

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Animating horse gaits and transitions

Animating horse gaits and transitions

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8th Theory and Practice of computer graphics Conference, TPCG 2010

作者： Murphy, J.E. Carr, H. O'Neill, M. Imaging Visualisation and Graphics Group School of Computer Science and Informatics University College Dublin Ireland Visualization and Virtual Reality Group School of Computing University of Leeds United Kingdom Natural Computing Research and Applications Group School of Computer Science and Informatics University College Dublin Ireland

ISBN: (纸本)9783905673753

Animations of horses are commonly used for entertainment purposes. A realistic animated model must move with a gait appropriate to its velocity. We present a kinematic animation system in which a horse model moves using gaits and transitions based on predictions from Dynamic Similarity theory. A Genetic Programming technique is used to evolve gait motion with dynamically adjustable limb extent. The system is controlled in real-time using a MIDI controller system based around the model's Froude number. We were successful in producing high quality animations of the horse's natural gaits and transitions. © The Eurographics Association 2010.

关键词： Genetic algorithms

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Advanced illumination techniques for GPU-based volume raycasting 09

Advanced illumination techniques for GPU-based volume raycas...

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ACM SIGGRAPH 2009 Courses, SIGGRAPH '09

作者： Hadwiger, Markus Ljung, Patric Salama, Christof Rezk Ropinski, Timo VRVis Research Center for Virtual Reality and Visualization Donau-City-Straße 1 A-1220 Vienna Austria Siemens Corporate Research Imaging and Visualization Department 755 College Road East Princeton NJ 08540 United States Computer Graphics Group University of Siegen Hölderlinstr. 3 57068 Siegen Germany Visualization and Computer Graphics Research Group University of Münster Einsteinstr. 62 48149 Münster Germany

ISBN: (纸本)9781450379380

Volume raycasting techniques are important for both visual arts and visualization. They allow efficient generation of visual effects and visualization of scientific data obtained by tomography or numerical simulation. Volume-rendering techniques are also effective for direct rendering of implicit surfaces used for soft-body animation and constructive solid geometry. The focus of this course is on volumetric illumination techniques that approximate physically based light transport in participating media. Such techniques include interactive implementation of soft and hard shadows, ambient occlusion, and simple Monte Carlo-based approaches to global illumination, including translucency and scattering.

关键词： Visualization

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Delocalized unsteady vortex region detectors

Delocalized unsteady vortex region detectors

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13th International Fall Workshop Vision, Modeling, and Visualization 2008, VMV 2008

作者： Fuchs, Raphael Peikert, Ronald Sadlo, Filip Alsallakh, Bilal Gröller, Meister Eduard Institute of Computer Graphics and Algorithms TU Vienna Austria VRVis Research Center for Virtual Reality and Visualization Vienna Austria Computer Graphics Laboratory ETH Zurich Switzerland

ISBN: (纸本)9781586039219

In this paper we discuss generalizations of instantaneous, local vortex criteria. We incorporate information on spatial context and temporal development into the detection process. The presented method is generic in so far that it can extend any given Eulerian criterion to take the Lagrangian approach into account. Furthermore, we present a visual aid to understand and steer the feature extraction process. We show that the delocalized detectors are able to distinguish between connected vortices and help understanding regions of multiple interacting vortex structures. The delocalized detectors extract smoother structures and reduce noise in the vortex detection result.

关键词： Vortex flow

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Advanced illumination for gpu volume

Advanced illumination for gpu volume

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ACM SIGGRAPH ASIA 2008 Courses, SIGGRAPH Asia'08

作者： Salama, Christof Rezk Ropinski, Timo Hadwiger, Markus Ljung, Patric Computer Graphics Group University of Siegen Hölderlinstr. 3 57068 Siegen Germany Visualization and Computer Graphics Research Group University of Münster Einsteinstr. 62 48149 Münster Germany VRVis Research Center for Virtual Reality and Visualization Donau-City-StraBe A-1220 Vienna Austria Siemens Corporate Research Imaging and Visualization Department 755 College Road East Princeton NJ 08540 United States

Volume raycasting techniques are important for both visual arts and. They allow an efficient generation of visual effects and visualization of scientific data obtained by tomography or numerical. Thanks to their flexibility, experts agree that GPU-based is the state-of-the art technique for interactive volume *** most likely replace existing slice-based techniques in the near. Volume rendering techniques are also effective for the direct rendering implicit surfaces used for soft body animation and constructive *** starts off with an in-depth introduction to the concepts GPU-based ray-casting to provide a common base for the following. The focus of this course is on advanced illumination techniques approximate the physically-based light transport more convincingly. techniques include interactive implementation of soft hard shadows, ambient occlusion and simple Monte-Carlo based approaches global illumination including translucency and scattering. the proposed techniques, users are le to interactively create images from volumetric data whose visual quality goes far traditional approaches. The optical properties in participating are defined using the phase function. Many approximations to the based light transport applied for rendering natural phenomena as clouds or smoke assume a rather homogenous phase function. For rendering volumetric scans on the other hand different phase models are required to account for both surface-like structures fuzzy boundaries in the data. Using volume rendering techniques,who create medical visualization for science magazines may now work on tomographic scans directly, without the necessity to fall back to creating polygonal models of anatomical structures.

关键词： Volume rendering

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IEEE Transactions on Haptics: Editorial

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IEEE Transactions on Haptics 2008年第1期1卷 2-8页

作者： Edward Colgate, J. Lederman, Susan Prattichizzo, Domenico Barbagli, Federico Basdogan, Cagatay Buss, Martin Ernst, Marc Frisoli, Antonio Gillespie, Brent Grant, Danny Harders, Matthias Hayward, Vincent Jones, Lynette Kajimoto, Hiroyuki Kappers, Astrid Kheddar, Abderrahmane Lin, Ming C. MacLean, Karon Miller, Brian Noma, Haruo Okamura, Allison M. O'Malley, Mareia Ryu, Jeha Tan, Hong Z. Yokokohji, Yasuyoshi Department of Psychology School of Computing Queen's University Canada IEEE Robotics and Automation Society Tübingen Germany Stanford University's Computer Science Department Tübingen Germany Institute of Automatic Control Engineering Technische Universität München Germany Independent Research Group Multisensory Perception and Action Max Planck Institute for Biological Cybernetics Tübingen Germany Department of Applied Mechanics SSSA Japan Research Division Virtual Reality and Telerobotic Systems PERCRO Laboratory Japan Department of Mechanical Engineering Japan Department of Robotics McGill University Canada Computer Vision Lab ETH Zurich Japan Virtual Reality in Medicine Group Japan IEEE CS/RAS Technical Committee on Haptics Japan Department of Electrical and Computer Engineering McGill University Canada Department of Mechanical Engineering MIT Japan University of Electro-Communications Japan Department of Physics and Astronomy Utrecht University Netherlands University of Evry France Chapel Hill United States Department of Computer Science University of British Columbia Canada ATR Knowledge Science Lab United Kingdom Department of Mechanical Engineering Denmark Johns Hopkins University United States Laboratory for Computational Sensing and Robotics United Kingdom Engineering Research Center for Computer-Integrated Surgical Systems and Technology United States Mechanical Engineering and Materials Science Department Rice University United States Korea Republic of Department of Electrical and Computer Engineering Mechanical Engineering and Psychological Sciences Purdue University United States Department of Mechanical Engineering and Science Graduate School of Engineering Kyoto University Japan

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On-line boosting for car detection from aerial images

On-line boosting for car detection from aerial images

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2007 IEEE International Conference on research, Innovation and Vision for the Future, RIVF 2007

作者： Nguyen, Thuy Thi Grabner, Helmut Bischof, Horst Gruber, Barbara Institute for Computer Graphics and Vision Graz University of Technology Austria VRVis Research Center for Virtual Reality and Visualization Graz Austria

ISBN: (纸本)1424406943

In this paper, we present a new approach for automatic car detection from aerial images. The system exploits a robust machine learning method known as boosting for efficient car detection from high resolution aerial images. We propose to use on-line boosting with interactive training framework to efficiently train and improve the detector. We use integral images for fast computation of features. This also allows to perform exhaustive search for detection of cars after training. For post processing, we employ a mean shift clustering method, which improves the detection rate significantly. In contrast to related work, our framework does not rely on any priori knowledge of the image like a site-model or contextual information, but if necessary this information can be incorporated. An extensive set of experiments on high resolution aerial images using the new UltraCamD shows the superiority of our approach. © 2007 IEEE.

关键词： Tracking (position)

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Visualizing spray paint deposition in VR training

Visualizing spray paint deposition in VR training

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2007 IEEE virtual reality Conference, VR'07

作者： Daeseok, Kim Youngwoo, Yoon Sunyu, Hwang Geehyuk, Lee Jinah, Park Information and Communications University Electronics and Telecommunications Research Institute Computer Graphics and Visualization Lab. 119 Munjiro Yuseong-gu Daejeon 305-714 Korea Republic of Human-Computer Interaction Lab. 119 Munjiro Yuseong-gu Daejeon 305-714 Korea Republic of Virtual Reality Research Team 161 Gajeong-dong Yuseong-gu Daejeon 305-700 Korea Republic of

ISBN: (纸本)1424409055

We present a real-time simulation of spray painting incorporated into a VR environment as an alternative training system for ship-building industries. The system allows the user to try out a painting work on life-size structures with a spray gun. Our goal is to provide a trainee realistic painting experience in real-time as well as to represent the thickness of the deposited paint on the surface for evaluation of his performance. The Gaussian model is used for a painting deposition model, and texture mapping technique is utilized to provide efficient visual feedback. We also present effective collision detection methods for a volume of spray paint particles. ©2007 IEEE.

关键词： Interactive computer graphics

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Vertical vergence calibration for augmented reality displays

Vertical vergence calibration for augmented reality displays

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IEEE virtual reality 2006 Conference

作者： Livingston, Mark A. Ellis, Stephen R. White, Sean M. Virtual Reality Lab. Naval Research Laboratory United States Human Information Processing Research Branch NASA Ames Research Center United States Department of Computer Science Columbia University United States

ISBN: (纸本)1424402239

Stereo and bi-ocular head-mounted displays (HMDs) require the user to fuse two,images into a coherent picture of the three-dimensional world, The human visual system performs this task constantly, but when the input images contain both real and graphical depictions, the problem becomes more difficult. A vertical disparity in the,graphics causes diplopia for user's trying to fuse the real and virtual objects simultaneously. We implement three methods, to measure and correct this disparity and assess them with,a collection of a single model of optical see-through HMD.

关键词： augmented reality head-mounted display vergence

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