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Fusion without independence

Fusion without independence

引用

2008 IET Seminar on Target Tracking and Data Fusion: Algorithms and Applications

作者： S. J. Julier Virtual Environments and Computer Graphics Group Department of Computer Science University College London London UK

ISBN: (纸本)9780863419102

Conditional independence is perhaps the most pervasive of all assumptions used in data fusion and estimation algorithms. If a noise corrupted observation is conditionally independent of the system state, Bayes Rule can be used in an optimal, recursive manner. However, this assumption rarely holds true in practice. One cause of dependency is modelling errors: any process or observation model is an approximation and incorrectly describes the true response of the system. A second cause is simplification. Even if the models are precisely known, the full Bayesian computations could be prohibitively expensive and some approximation must be used.

关键词： approximation Fusion reactions Fusion, biological FUSION fusion (melting) Conditional Independence Data fusion system response Noise data integration Bayes

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GPD: A graph pattern diffusion kernel for accurate graph classification with applications in cheminformatics 8

GPD: A graph pattern diffusion kernel for accurate graph cla...

引用

8th International Workshop on Data Mining in Bioinformatics, BIOKDD 2008 - Held in conjunction with 14th ACM SIGKDD Conference on Knowledge Discovery and Data Mining, KDD 2008

作者： Smalter, Aaron Huan, Jun Yi, Jia Lushington, Gerald H. Department of Electrical Engineering and Computer Science University of Kansas LawrenceKS66047-7621 United States Molecular Graphics and Modeling Laboratory University of Kansas LawrenceKS United States

ISBN: (纸本)3642125182

Graph data mining is an active research area. Graphs are general modeling tools to organize information from het-erogenous sources and have been applied in many scientific, engineering, and business fields. With the fast accumulation of graph data, building highly accurate predictive models for graph data emerges as a new challenge that has not been fully explored in the data mining community. In this paper, we demonstrate a novel technique called graph pattern diffusion kernel (GPD). Our idea is to leverage existing frequent pattern discovery methods and to explore the application of kernel classifier (e.g. support vector machine) in building highly accurate graph classification. In our method, we first identify all frequent patterns from a graph database. We then map subgraphs to graphs in the graph database and use a process we call "pattern diffusion" to label nodes in the graphs. Finally we designed a novel graph alignment algorithm to compute the inner product of two graphs. We have tested our algorithm using a number of chemical structure data. The experimental results demonstrate that our method is significantly better than competing methods such as those kernel functions based on paths, cycles, and subgraphs. © 2008 ACM

关键词： Graph Databases

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Automatically generating summary visualizations from game logs

Automatically generating summary visualizations from game lo...

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4th Artificial Intelligence and Interactive Digital Entertainment Conference,AIIDE 2008

作者： Cheong, Yun-Gyung Jhala, Arnav Bae, Byung-Chull Young, R. Michael Department of Computer Science Liquid Narrative Group North Carolina State University United States Graphics and OS Group SAIT Samsung Electronics Co. LTD. Korea Republic of

ISBN: (纸本)9781577353911

In this paper we describe a system called ViGLS (Visualization of Game Log Summaries) that generates summaries of gameplay sessions from game logs. ViGLS automatically produces visualization of the summarized actions that are extracted based on cognitive models of summarization. ViGLS is implemented using a serviceoriented architecture, de-coupling the summarization methods from any particular game engine being used. The camera code libraries used in visualization are based on constraint based camera control approaches and, in our implementation, make use of the scripting layer of the Unreal game engine. Copyright © 2008, Association for the Advancement of Artificial Intelligence.

关键词： Visualization

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Fast and exact solution of Total Variation models on the GPU

Fast and exact solution of Total Variation models on the GPU

引用

IEEE computer Society Conference on computer Vision and Pattern Recognition Workshops (CVPRW)

作者： Thomas Pock Markus Unger Daniel Cremers Horst Bischof Institute for Computer Graphics and Vision Graz University of Technology Austria Department of Computer Science University of Bonn Germany

This paper discusses fast and accurate methods to solve total variation (TV) models on the graphics processing unit (GPU). We review two prominent models incorporating TV regularization and present different algorithms to solve these models. We mainly concentrate on variational techniques, i.e. algorithms which aim at solving the Euler Lagrange equations associated with the variational model. We then show that particularly these algorithms can be effectively accelerated by implementing them on parallel architectures such as GPUs. For comparison we chose a state-of-the-art method based on discrete optimization techniques. We then present the results of a rigorous performance evaluation including 2D and 3D problems. As a main result we show that the our GPU based algorithms clearly outperform discrete optimization techniques in both speed and maximum problem size.

关键词： computer vision computer graphics TV Lagrangian functions Acceleration Optical computing Iterative algorithms Image denoising Equations Parallel architectures

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A Universal Extensible Architecture for Algorithm Visualisation Systems

A Universal Extensible Architecture for Algorithm Visualisat...

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International Conference on computer science and Software Engineering

作者： Ashraf Abu Baker Boris Milanovic Institute for Computer Graphics Department of Computer Science and Mathematics Johann Wolfgang Goethe-University of Frankfurt Frankfurt Germany

ISBN: (纸本)9781424439027

The increasing demands on interactive algorithm visualisations that can be effectively used in learning, teaching and research, as well as the lack of up-to-date visualisation systems calls for a new modern architecture for universal algorithm visualisation systems (AVS). Defining a new architecture requires an extensive analysis of existing AVS and specifying key requirements, which the architecture has to meet. Analysing current AVS and comparing them to each other, we came to the decision that there is a great potential for designing and implementing a new universal and extensible modern architecture. Based on our analysis and motivated by the decreasing interest on algorithm improvisations by both developers and faculty over the last few years, we have developed and implemented a generic architecture that we briefly present in this work. The application of this architecture simplifies the creation process of pedagogically effective visualisations of arbitrary algorithms and data structures.

关键词： Data structures Animation computer science computer architecture Education Data visualization Software algorithms Algorithm design and analysis Instruments Electronic learning

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A Stochastic Approach Based Bayesian Salient Motion Segmentation Method

A Stochastic Approach Based Bayesian Salient Motion Segmenta...

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International Conference on computer science and Software Engineering

作者： Peng Tang Lin Gao Peng Sheng Image and Graphics Institute Computer Science Department Sichuan University Chengdu China

ISBN: (纸本)9781424439027

Moving object segmentation techniques are fundamental and crucial for video surveillance. In this paper, we abandoned the traditional background differential model approach which ignores the foreground modeling, and address this problem under the Bayesian framework. Our major contribution can be summarized as, modeling the background and foreground competitively to augment the segmentation accuracy, implementing the prior information to enforce spatial-temporal consistency, and introducing the Monte Carlo importance sampling techniques which effectively reduces the computation complexity while guarantees the expected veracity. Promising results demonstrate the potentials of the proposed framework.

关键词： Stochastic processes Bayesian methods Motion segmentation computer vision Object segmentation Object detection Colored noise computer science Monte Carlo methods Machine vision

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Probabilistic Visual Tracking using Global and Local Object's Information

Probabilistic Visual Tracking using Global and Local Object'...

引用

International Conference on computer science and Software Engineering

作者： Lin Gao Zhifang Liu Peng Tang Image and Graphics Institute Computer Science Department Sichuan University Chengdu China

ISBN: (纸本)9781424439027

This paper presents a robust visual tracking algorithm by exploiting global and local objectpsilas information under a particle filter tracking framework. The proposed algorithm utilize a two-stage cascade scheme to update the particles within the state space in a coarse to fine manner. At the first stage, the object state is estimated by a coarse search using global color statistics. Then a refined estimate is achieved through exploring the local binary pattern feature. To overcome the problem of poor priors in the conventional particle filter which uses system transition as the proposal distribution, we use the state estimation made at the first stage to construct the proposal distribution that seamlessly integrates the current observation. Experimental results demonstrate the efficiency and accuracy of the proposed algorithm.

关键词： Particle tracking Particle filters Proposals Target tracking Robustness Bayesian methods State estimation computer science Vehicle dynamics Histograms

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Vehicular wireless burst switching network: Enhancing rural connectivity

Vehicular wireless burst switching network: Enhancing rural ...

引用

2008 IEEE Globecom Workshops, GLOBECOM 2008

作者： Farahmand, Farid Patel, Ankitkumar N. Jue, Jason P. Soares, Vasco G. Rodrigues, Joel J. Department of Computer Electronics and Graphics Technology Central Connecticut State University New Britain CT 06050 United States Department of Computer Science University of Texas at Dallas Richardson TX 75083 United States Institute of Telecommunications Networks and Multimedia Group Portugal Department of Informatics University of Beira Interior Covilhã Portugal

ISBN: (纸本)9781424430628

This paper introduces a network architecture called Vehicular Wireless Burst Switching (VWBS). The main objective of this architecture is to provide low-cost connectivity solution for isolated and dispersed regions with no networks infrastructure. The proposed architecture is based on the concept of Delay Tolerant Networks (DTN) and can be applied to various scenarios, including rapid deployment of emergency communication systems when all communication links have failed. In this paper, we present an overview of VWBS networks and show how their performance, in terms of average packet delays, can be improved using store-and-forward devices called relay nodes. Furthermore, we introduce several heuristic algorithms, which can be used to place minimum number of relay nodes. Through computer simulations, we compare the performance of the algorithms and their tradeoffs. We conclude our work by examining possible open research issues in VWBS. © 2008 IEEE.

关键词： Network architecture

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Evaluation of Constructable Match Cost Measures for Stereo Correspondence Using Cluster Ranking

Evaluation of Constructable Match Cost Measures for Stereo C...

引用

26th IEEE Conference on computer Vision and Pattern Recognition (CVPR 2008), vol.9

作者： Daniel Neilson Yee-Hong Yang Computer Graphics Lab Department of Computing Science University of Alberta Edmonton AB Canada

Stereo correspondence research often involves the comparison of techniques to determine which are better under different circumstances. The methods of comparison employed often take the form of applying the techniques to a few stereo image pairs with the technique with the lowest error rate declared superior. However, the majority of these comparisons do not contain any discussion of statistical significance;making the declared superiority of a technique statistically unreliable. In this paper we present a new evaluation method called cluster ranking that yields a statistically significant comparison of the stereo techniques being compared. Cluster ranking leverages statistical inference techniques to first rank the performance of stereo techniques on a single stereo image pair and then combine the rankings from multiple stereo pairs into an over-all ranking;in both of these rankings, only stereo techniques that are statistically different are given different ranks. We demonstrate our framework with a comparison of constructable match cost measures (those that can be assembled from a base set of components) on a data set consisting of 30 synthetic stereo pairs, with varying amounts of noise, and 18 scenes from the 2005 and 2006 Middlebury data sets. Our analysis reveals match cost measures, and measure components, that are statistically superior to all other measures depending on amount of noise, illumination, or exposure time.

关键词： Costs Clustering algorithms Noise measurement Testing Error analysis Time measurement Layout Lighting Analysis of variance Assembly

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Scalable high performance computing on FPGA clusters using message passing

Scalable high performance computing on FPGA clusters using m...

引用

International Conference on Field Programmable Logic and Applications

作者： Eoin Creedon Michael Manzke Department of Computer Science Trinity College Dublin Graphics Vision and Visualisation Group Ireland

The direct connection of application logic to network logic allows parallel applications to better leverage the network resources. We present a hardware description language message passing application programming interface (HDL MP API) for FPGAs. This allows an application to operate both local and network resources in a uniform, scalable and portable manner, independent of the interconnect. We use the message passing communication paradigm with all necessary communication operations performed by dedicated control hardware, independently of the interconnect. Ethernet has been used as the interconnect to demonstrate the HDL MP API functionality for this proof of concept system. Parallel linear array matrix multiplication has been implemented and tested using the HDL MP API. This application demonstrates the scalability provided by the HDL MP API.

关键词： Field programmable gate arrays Hardware design languages Message passing Arrays High performance computing Ethernet networks Hardware

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