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检索条件"任意字段=International Symposium on 3D Data Processing Visualization and Transmission"

共 1621 条记录，以下是581-590 订阅

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Visual Landmark-Based Localization for MAVs Using Incremental Feature Updates

Visual Landmark-Based Localization for MAVs Using Incrementa...

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international Conference on 3d Imaging, Modeling, processing, visualization and transmission (3dIMPVT)

作者： Andreas Wendel Michael Maurer Horst Bischof Institute for Computer Graphics and Vision Graz University of Technology Austria

Micro aerial vehicles (MAVs) are gaining importance as image acquisition tools in urban environments, where areas of interest are often close to buildings and to the ground. While GPS is still the most widely used sensor for outdoor localization, urban applications motivate the change towards visual localization. We present a framework based on metric, geo-referenced visual landmarks, which can be obtained by taking images with a consumer camera at ground level. Visual landmarks serve as prior knowledge to the MAV and allow robust, high-accuracy localization in urban environments. The issue of differing camera views in higher altitudes is reduced by incremental feature updates, a novel technique which boosts the performance by 30% in comparison to previous work, facilitates long-term operation, and results in a localization rate of 83%. We validate the visual pose estimation in-flight by comparison to IMU and GPS data, and evaluate our positioning accuracy with respect to differential GPS.

关键词： Cameras visualization Global Positioning System Feature extraction Image reconstruction Solid modeling Buildings

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Multiple View Stereo by Reflectance Modeling

Multiple View Stereo by Reflectance Modeling

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international Conference on 3d Imaging, Modeling, processing, visualization and transmission (3dIMPVT)

作者： Sujung Kim Seong dae Kim Anders Lindbjerg dahl Knut Conradsen Rasmus Ramsbøl Jensen Henrik Aanæs Korea Advanced Institute of Science and Technology Daejeon South Korea DTU Informatics Technical University of Denmark Lyngby Denmark

Multiple view stereo is typically formulated as an optimization problem over a data term and a prior term. The data term is based on the consistency of images projected on a hypothesized surface. This consistency is based on a measure denoted a visual metric, e.g. normalized cross correlation. Here we argue that a visual metric based on a surface reflectance model should be founded on more observations than the degrees of freedom (dof) of the reflectance model. If (partly) specular surfaces are to be handled, this implies a model with at least two dof. In this paper, we propose to construct visual metrics of more than one dof using the dAISY methodology, which compares favorably to the state of the art in the experiments carried out. These experiments are based on a novel data set of eight scenes with diffuse and specular surfaces and accompanying ground truth. The performance of six different visual metrics based on the dAISY framework is investigated experimentally, addressing whether a visual metric should be aggregated from a set of minimal images, which dof is best, or whether a combination of one and two dof should be used. Which metric performs best is dependent on the viewed scene, although there are clear tendencies for the two dof minimal metric to be the preferred one.

关键词： visualization Measurement Tensile stress Cameras data models Stereo vision Optimization

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Reliable 3d video P2P transmission enabling synthesis of virtual views

Reliable 3D video P2P transmission enabling synthesis of vir...

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international symposium on Communications Control and Signal processing (ISCCSP)

作者： S. Milani G. Calvagno Department of Information Engineering University of Padova Italy

Multiple description Coding (MdC) and Peer-to-Peer transmission protocols prove to be extremely effective in the transmission of multimedia contents for both their robustness and flexibility. As a matter of fact, they permit building efficient architectures for the transmission of three-dimensional video signals. The paper presents an MdC strategy for the transmission of 3d video signals consisting in multiple views and depth signals. The coded data are included in a matrix and FEC Reed-Solomon codes are then employed to generate a set of descriptions that are to be uploaded in the network by different peers. Packet classification strategies can affect the quality of the reconstructed 3d video sequence. As a matter of fact, different packet scheduling algorithms are compared under general transmission scenarios. Experimental results show that a classification strategy based on game theory improves the quality of the reconstructed sequence with respect to standard algorithms.

关键词： PSNR Streaming media Peer to peer computing Encoding Three dimensional displays Forward error correction Signal processing algorithms

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decentralised Regression Model for Intelligent Forecasting in Multi-agent Traffic Networks

Decentralised Regression Model for Intelligent Forecasting i...

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9th international symposium on distributed Computing and Artificial Intelligence (dCAI 2012)

作者： Fiosina, Jelena Ciausthal Univ Technol Inst Informat D-38678 Clausthal Zellerfeld Germany

ISBN: (纸本)9783642287640

The distributed nature of complex stochastic systems, such as traffic networks, can be suitably represented by multi-agent architecture. Centralised data processing and mining methods experience difficulties when data sources are geographically distributed and transmission is expensive or not feasible. It is also known from practice that most drivers rely primarily on their own experience (historical data). We consider the problem of decentralised travel time estimation. The vehicles in the system are modelled as autonomous agents consisting of an intellectual module for data processing and mining. Each agent uses a local linear regression model for prediction. Agents can adjust their model parameters with others on demand, using the proposed resampling-based consensus algorithm. We illustrate our approach with case studies, considering decentralised travel time prediction in the southern part of the city of Hanover (Germany).

关键词： Regression parameter estimation distributed data processing and mining multi-agent systems

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PatchMatch-Based Content Completion of Stereo Image Pairs

PatchMatch-Based Content Completion of Stereo Image Pairs

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international Conference on 3d Imaging, Modeling, processing, visualization and transmission (3dIMPVT)

作者： Bryan Morse Joel Howard Scott Cohen Brian Price Brigham Young University Provo UT USA Adobe Systems Inc. San Jose CA USA

This paper presents a method for completing target regions ("hole filling") in RGB stereo pairs. It builds upon the state of the art for completing single images by matching to and then blending source patches drawn from the rest of the image. A method is introduced for first completing the respective disparity maps using a coupled partial differential equation based on that of Bertalmio, et al., extended to create mutual disparity consistency. Estimated disparities are then used to guide completion of the missing color image texture. An extension to the coherence-based objective function introduced by Wexler, et al. is then introduced, which not only encourages coherence of the respective images with respect to source images but also stereoscopic consistency between the two. The Patch Match algorithm of Barnes, et al. is extended to cross-image searching and matching. This matching is capable of automatically copying from corresponding unoccluded portions of the other image without requiring an explicit preliminary warping step. Stereoscopic consistency is produced by giving preference to matches with cross-image consistency when blending source patches. Results demonstrate that this method produces better completion than either single-image completion or previous methods for stereo completion.

关键词： data structures Boolean functions Stereo image processing Image color analysis Coherence Color Linear programming

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Large-scale visual data analysis

Large-scale visual data analysis

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international symposium on Parallel and distributed processing (IPdPS)

作者： Chris Johnson Scientific Computing and Imaging Institute University of Utah USA

Summary form only give, as follows. Modern high performance computers have speeds measured in petaflops and handle data set sizes measured in terabytes and petabytes. Although these machines offer enormous potential for solving very large-scale realistic computational problems, their effectiveness will hinge upon the ability of human experts to interact with their simulation results and extract useful information. One of the greatest scientific challenges of the 21st century is to effectively understand and make use of the vast amount of information being produced. Visual data analysis will be among our most important tools in helping to understand such large-scale information. Our research at the Scientific Computing and Imaging (SCI) Institute at the University of Utah has focused on innovative, scalable techniques for large-scale 3d visual data analysis. In this talk, I will present state-of-the-art visualization techniques, including scalable visualization algorithms and software, cluster-based visualization methods and innovative visualization techniques applied to problems in computational science, engineering, and medicine. I will conclude with an outline for future high performance visualization research challenges and opportunities.

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Selected pre-processing methods to STIM-T projections

Selected pre-processing methods to STIM-T projections

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3rd international symposium on CompIMAGE - Computational Modelling of Objects Represented in Images - Fundamentals, Methods and Applications

作者： Marques, A. C. Beaseley, d. Alves, L. C. da Silva, R. C. Univ Tecn Lisboa Inst Super Tecn Inst Tecnol & Nucl Sacavem Portugal

ISBN: (纸本)9780415621342

Scanning transmission Ion Microscopy (STIM) is a non-destructive microscopy that cross-sectionally probesthe energy losses of ions transmitted across very thin samples. By combining the generated 2d projection maps with sample rotation STIM lends itself to quantitative mass density analysis in 2- and 3-dimensions with micrometerresolution. A STIM system and results of first performance tests of pre-processing and reconstruction software ofa noncomplex sample are described. Selected pre-processing methods were applied to projection data prior to reconstruction, for evidencing its impact on the quality of reconstruction. In the process a new algorithm for removal of background noise and spikes arising from detector operation was developed. The principle is based on the determination of a mask limited by the object contours and setting outlyingpixels to zero. This approach is less prone to deleting very thin structures in the object that produced only a small but real energy signal. Furthermore it may be applied to 2d images obtained by other vision techniques.

关键词： Energy dissipation

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A novel method for an automatic 3d reconstruction of coronary arteries from angiographic images

A novel method for an automatic 3D reconstruction of coronar...

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international symposium on Signal processing and Its Applications (ISSPA)

作者： Severine Habert Séverine Habert Nagib dahdah Farida Cheriet Sainte-Justine Hospital Research Center Montreal QC Canada Biomedical Engineering Institute Ecole Polytechnique de Montréal QC Canada Polytechnique Montreal Montreal QC CA

This paper presents a new application of the shape from silhouette (SFS) method for the 3d reconstruction of coronary arteries with Kawasaki disease from angiographic images. The silhouettes of the arteries were first segmented from the angiographic images using the Frangi filter followed by thresholding then a morphologic erosion step. Finally, a volume-based reconstruction approach was performed to infer the visual hull representing the 3d volume of the segmented arteries. The proposed method was first validated on simulated data to determine the optimal number of views that provide a 3d reconstruction with an adequate precision. The sensitivity of the proposed method to calibration errors was also evaluated. Furthermore, a clinical evaluation on four patients with Kawasaki disease showed that using three views in addition to the standard AP and LAT views does not improve the accuracy of the 3d reconstruction. Therefore, this study showed that an online 3d reconstruction of the coronary arteries, requiring less than one minute, during the acquisition could help to rationalize the number of views required for the 3d assessment of aneurysms.

关键词： Image reconstruction Arteries Aneurysm Three dimensional displays visualization Shape Image segmentation

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Flight data visualization for Simulation & Evaluation: A General Framework

Flight Data Visualization for Simulation & Evaluation: A Gen...

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2012 Fifth international symposium on Computational Intelligence and design [第五届计算智能与设计国际会议 ISCId 2012]

作者： Haoran Guo Jianmin Pang Lin Han Zheng Shan National Digital Switching System Engineering & Technology Research Center Postbox 1001 No. 717 Zhengzhou 450002 Henan China

Flight data records the important plane subsystem status, attitudes, actions, key parameters, etc. during whole flight. visualization of the information extracted from flight data is very useful to replay the entire flight and evaluate the quality. In this paper, we present a general framework to simulate and evaluate the flight course based on flight data processing and visualization. Firstly, we give out the flight maneuver recognition algorithm based on modified Particle Swarm Optimization (PSO). Then, we take the flight action evaluation as the problem of multivariate time series similarity measure, and construct the similarity matching model between recognized maneuvers and standard maneuvers to achieve quantitative evaluation of flight maneuver. We also implement the visualization engine based on OpenSceneGraph to simulate/replay the flight maneuver, flight path and the terrain of flying zone. Our framework not only fit for simulation and evaluation single kind (or type) of plane's flight quality, any plane has the same flight data format can be simulated and replayed in 3d in our framework.

关键词： Flight data Flight Maneuver Recognition Simulation Flight Quality visualization

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Visibility driven visualization of 3d cardiac ultrasound data on the GPU

Visibility driven visualization of 3D cardiac ultrasound dat...

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IEEE symposium (IUS) Ultrasonics

作者： Espen Stene Brønstad Jon Petter Åsen Hans G. Torp Gabriel Kiss Department of Physics MI Lab and Department of Circulation and Medical Imaging Norwegian University of Science and Technology Trondheim Norway MI Lab and Department of Circulation and Medical Imaging Norwegian University of Science and Technology Trondheim Norway St. Olav's University Hospital Trondheim Norway

direct volume rendering (dVR) has become a widely used technique for visualizing anatomical structures in medical 3d datasets The aim of this study was to locally adapt the opacity transfer function (OTF) in order to improve the results achieved when rendering 3d echocardiographic datasets using dVR. A novel approach for defining locally adaptive OTFs has been tested and adapted to echo data and implemented on the GPU. The local OTF is modeled as a truncated second order polynomial. The algorithm locates significant transitions along the ray profile (feature detection along the ray) in order to estimate an opacity threshold (below which all values are considered transparent) and the steepness of the polynomial for each ray. A reference global OTF and the locally adaptive algorithm have been implemented on a GPU using OpenCL and tested on a dataset of nine 3d echo recordings. The rendering resolution is 512×512×300, while average timing is 28ms, 104ms for the reference and the new method respectively. The locally adaptive OTFs were able to compensate for high variations in tissue (and such reducing wall drop-outs) and blood pool signal (reducing spurious structures inside the cavity). The method depends on a number of user defined parameters, determining these values robustly is subject of ongoing research.

关键词： Feature extraction Rendering (computer graphics) Histograms Transfer functions Blood Ultrasonic imaging Graphics processing units

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