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检索条件"任意字段=Conference on Multimedia Content Access - Algorithms and Systems II"

共 179 条记录，以下是141-150 订阅

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Overlapped tiling for fast random access of low dimensional data from high dimensional datasets

Overlapped tiling for fast random access of low dimensional ...

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multimedia content access: algorithms and systems iiI

作者： Fan, Zihong Ortega, Antonio Signal and Image Processing Institute Dept. of Electrical Engineering Univ. of Southern California Los Angeles CA United States

Volume visualization with random data access poses significant challenges. While tiling techniques lead to simple implementations, they are not well suited for cases where the goal is to access arbitrarily located subdimensional dataseis (e.g., displaying a "band" of several paralllel lines of arbitrary orientation from a 2D image;being able to display an arbitrary 2D planar "cut" from a 3D volume). Significant effort has been devoted to volumetric data compression, with most techniques proposing to tile volumes into cuboid subvolumes to enable random access. In this paper we show that, in cases where subdimensional datasets are accessed, this leads to significant transmission inefficiency. As an alternative, we propose novel server-client based data representation and retrieval methods which can be used for fast random access of low dimensional data from high dimensional datasets. In this paper, 2D experiments are shown but the approach can be extended to higher dimensional datasets. We use multiple redundant tilings of the image, where each tiling has a different orientation. We discuss the 2D rectangular tiling scheme and two main algorithm components of such 2D system, namely, (i) a fast optimal search algorithm to determine which tiles should be retrieved for a given query and (ii) a mapping algorithm to enable efficient encoding without interpolation of rotated tiles. In exchange for increased server storage, we demonstrate that significant reductions, a factor of 2 in bandwidth reduction, can be achieved relative to conventional square tiling techniques. The transmission rate can be reduced even more by allowing more storage overhead. This method speeds up the random access procedure and saves memory on the user's side. Here we use the 2D example to retrieve random lines (or sets of lines) from a 2D image. While our experiments are based on extracting ID data from 2D datasets, the proposed method can be extended to 3D or higher dimensions. The associated basi

关键词： Data visualization

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An adaptive view element framework for multi-dimensional data management 99

An adaptive view element framework for multi-dimensional dat...

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8th International conference on Information Knowledge Management (CIKM 99)

作者： Smith, JR Li, CS IBM TJ Watson Res Ctr Data Management Hawthorne NY 10532 USA

ISBN: (纸本)1581131461

We present an adaptive wavelet view element framework for managing different types of multi-dimensional data in storage and retrieval applications. We consider the problems of multi-dimensional data compression, multi-resolution sub-region access, selective materialization, progressive retrieval and similarity searching. The framework uses wavelets to partition the multi-dimensional data into view elements that form the building blocks for synthesizing views of the data. The view elements are organized and managed using different view element graphs. The graphs are used to guide cost-based view element selection algorithms for optimizing compression, access, retrieval and search performance. We present the adoptive wavelet view element framework and describe its application in managing multi-dimensional data such as 1-D time series data, 2-D images, video sequences, and multi-dimensional data cubes. We present experimental results that demonstrate that the adaptive wavelet view element framework improves performance of compressing, accessing, and retrieving multi-dimensional data compared to non-adaptive methods.

关键词： multimedia database systems data management OLAP data cubes content-based search digital libraries and information retrieval

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PCI-bus content-addressable-memory (CAM) implementation on FPGA for pattern ecognition/image retrieval in a distributed environment

PCI-bus content-addressable-memory (CAM) implementation on F...

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conference on Applications of Digital Image Processing XXVii

作者： Megherbi, DB Yan, Y Tanmay, P Khoury, J Woods, CL Univ Massachusetts CMINDS Res Ctr Dept Elect & Comp Engn Lowell MA 01854 USA

ISBN: (纸本)0819454966

Recently surveillance and Automatic Target Recognition (ATR) applications are increasing as the cost of computing power needed to process the massive amount of information continues to fall. This computing power has been made possible partly by the latest advances in FPGAs and SOPCs. In particular, to design and implement state-of-the-Art electro-optical imaging systems to provide advanced surveillance capabilities, there is a need to integrate several technologies (e.g. telescope, precise optics, cameras, image/compute vision algorithms, which can be geographically distributed or sharing distributed resources) into a programmable system and DSP systems. Additionally, pattern recognition techniques and fast information retrieval, are often important components of intelligent systems. The aim of this work is using embedded FPGA as a fast, configurable and synthesizable search engine in fast image pattern recognition/retrieval in a distributed hardware/software co-design environment. In particular, we propose and show a low cost content Addressable Memory (CAM)-based distributed embedded FPGA hardware architecture solution with real time recognition capabilities and computing for pattern look-up, pattern recognition, and image retrieval. We show how the distributed CAM-based architecture offers a performance advantage of an order-of-magnitude over RAM-based architecture (Random access Memory) search for implementing high speed pattern recognition for image retrieval. The methods of designing implementing, and analyzing the proposed CAM based embedded architecture are described here. Other SOPC solutions/design issues are covered. Finally, experimental results, hardware verification, and performance evaluations using both the Xilinx Virtex-ii and the Altera Apex20k are provided to show the potential and power of the proposed method for low cost reconfigurable fast image pattern recognition/retrieval at the hardware/software co-design level.

关键词： pattern recognition content addressable memory (CAM) embedded processor FPGA Virtex image retrieval (IR) SOPC DSP ASIC

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multimedia summaries of broadcast news

Multimedia summaries of broadcast news

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Australian and New Zealand conference on Intelligent Information systems

作者： M.T. Maybury A.E. Merlino Advanced Information Systems Center MITRE Corporation Bedford MA USA

Increasing amounts of text, audio, and video content has fueled efforts to provide direct, content based access to these materials. Summaries are often necessary to enable timely relevancy assessments, information extraction, or information analysis from source material. Whereas text summarization research is receiving increasing attention, comparatively few investigators have examined video summarization. We report on the extension of a broadcast news access system to provide multimedia summaries. We briefly overview our system for video analysis, focusing on our novel integration of image, speech and language processing techniques to support automated video summarization. We outline algorithms for proper name and keyphrase extraction, story segmentation, and key frame extraction which together underpin our current ability to automatically summarize video. We describe the systems ability to generate multimedia video summaries tailored to a user query. We discuss evaluation metrics for measuring the (quality) value of these summary artifacts.

关键词： Digital multimedia broadcasting multimedia communication multimedia systems Speech analysis Data mining Information analysis Image analysis Speech processing Natural languages Image segmentation

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Fast Adaptation Decision Taking for Cross-Modal multimedia content Adaptation

Fast Adaptation Decision Taking for Cross-Modal Multimedia C...

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IEEE International conference on multimedia and Expo (ICME)

作者： Martin Prangl Hermann Hellwagner Tibor Szkaliczki Department of Information Technology Klagenfurt University Klagenfurt Austria ELearning Department Computer and Automation Research Institute Hungarian Academy of Sciences (ATOMKI) Budapest Hungary

In order to enable transparent and convenient use of multimedia content across a wide range of networks and devices, content adaptation is an important issue within multimedia frameworks. The so called digital item adaptation (DIA) standard is one of the core concepts of the MPEG-21 framework that will support the adaptation of multimedia resources according to device capabilities, underlying network characteristics, and user preferences. Most multimedia adaptation engines for providing universal multimedia access (UMA) scale the content with respect to terminal capabilities and resource constraints. This paper focuses on the cross-modal adaptation decision taking process considering the user environment and terminal capabilities as well as resource limitations on the server, network, and client side. This approach represents a step toward increased universal multimedia experience (UME). Based on four different algorithms for solving this optimization process, we present an evaluation of results gained by running their implementations on different test networks

关键词： Streaming media Network servers Testing multimedia systems Layout Information technology Search engines IP networks Personal digital assistants Mobile handsets

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content-based representative frame extraction for digital video

Content-based representative frame extraction for digital vi...

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IEEE International conference on multimedia Computing and systems (ICMCS)

作者： Xinding Sun M.S. Kankanhalli Yongwei Zhu Jiankang Wu RWC Novel Function ISS Lab Kent Ridge Digital Laboratories Singapore Singapore Department of Electrical Engineering Indian Institute of Science Bangalore India

We consider a content-based adaptive clustering algorithm (CBAC) to extract a fixed pre-determined number of representative frames to summarize a given digital video. In our algorithm, shot boundary detection is not needed. The inter-frame changes are compared globally for the extraction of representative frames. Small units of the video are dynamically clustered into two clusters based on the amount of change in content within the unit. One cluster, which has units of low content change, is designated for deletion and the other cluster, which has units of high content change, is for retention. The algorithm adaptively converges to the desired number of frames by deleting some redundant frames from each unit of the deletion cluster during every iteration.

关键词： Gunshot detection systems Motion detection Random access memory Ferroelectric films Nonvolatile memory Sun Clustering algorithms Shape HTML Video sequences

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Boolean bounding predicates for spatial access methods: Extended abstract 13th

Boolean bounding predicates for spatial access methods: Exte...

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13th International conference on Database and Expert systems Applications, DEXA 2002

作者： Thomas, Megan Hellerstein, Joseph M. Computer Science Division University of California Berkeley United States

ISBN: (纸本)3540441263

Tree-based multidimensional indexes are integral to efficient queryingin multimedia and GIS applications. These indexes frequently use shapes in internal tree nodes to describe the data stored in a subtree below. We show that the standard Minimum BoundingRe ctangle descriptor can lead to significant inefficiency during tree traversal, due to false positives. We also observe that there is often space in internal nodes for richer, more accurate descriptors than *** propose exploiting his free space to form subtree predicates based on simple Boolean combinations of standard descriptors such as rectangles. Since the problem of choosingt hese boolean bounding predicates is NP-complete, we implemented and tested several heuristics for tuningthe bounding predicates on an index node, and several heuristics for decidingwh ich nodes in the index to improve when available tuningt ime is limited. We present experiments over a variety of real and synthetic data sets, examiningthe performance benefit of the various tuninghe uristics. Our experiments show that up to 50% of the unnecessary I/Os caused by imprecise subtree predicates can be eliminated usingthe boolean bounding predicates chosen by our algorithms. © Springer-Verlag Berlin Heidelberg 2002.

关键词： Trees (mathematics)

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contention based consistency maintenance for client cache

Contention based consistency maintenance for client cache

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International conference on Information, Communications and Signal Processing

作者： IlYoung Chung JongMin Lee Chong-Sun Hwang Department of Computer Science and Engineering Korea University Seoul South Korea

ISBN: (纸本)0780336763

In client-server database systems, clients can maintain their own cache to reduce the overhead of accessing data objects at the server database. In this case, there should be a protocol which ensures the consistency of cached data. In this paper, we propose a cache consistency algorithm, contention based algorithm (CBA), which dynamically applies the appropriate protocol for each data object. When the contention of data objects is uniformly low or uniformly high, the proposed algorithm shows the same performance as existing algorithms, and when the contention is not uniform, the proposed algorithm shows better performance than existing algorithms.

关键词： access protocols Software algorithms Workstations content management Database systems Temperature Computer science Data engineering Heuristic algorithms Software architecture

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4th International IFIP-TC6 Networking conference, NETWORKING 2005

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4th International IFIP-TC6 Networking conference, NETWORKING 2005

ISBN: (纸本)9783540258094

The proceedings contain 143 papers. The special focus in this conference is on Peer-to-peer networks, Performance of internet protocols I, Wireless security, Network security, Wireless performance, Network service support, Network modeling and simulations, Wireless LANs, Optical networking, Performance of internet & web applications, Ad Hoc networks I, Adaptive networking;Performance of internet protocols ii, Radio resource management, Internet routing, Queuing models, Network monitoring, measurement and profiling, Network management systems;Sensor and Ad Hoc networks, Overlay multicast, Quality of service, Wireless scheduling, Improving multicast communication, Traffic management and engineering I, Ad Hoc networks ii, Traffic management and engineering ii, Mobility management, Bandwidth management, CDMA, Wireless resource management and Posters. The topics include: Topology-aware peer-to-peer on-demand streaming;the scalability of swarming peer-to-peer content delivery;leopard;decentralized and secure accounting for peer-to-peer applications;highly responsive and efficient QoS routing using pre- and on-demand computations along with a new normal measure;experiences and analyses;a formal, comprehensive metric for packet reordering;batch scheduling algorithms for optical burst switching networks;ECC based threshold cryptography for secure data forwarding and secure key exchange in MANET (I);mutual authentication and key exchange protocols with anonymity property for roaming services;an energy-efficient image representation for secure mobile systems;efficient clustering for multicast key distribution in MANETs;using secure coprocessors to protect access to enterprise networks;trusted security devices for bandwidth conservation in IPSec environments and lightweight internet permit system for stopping unwanted packets.

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An architecture of automating production of cross media content for multi-channel distribution

An architecture of automating production of cross media cont...

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International conference on Automated Production of Cross Media content for Multi-Channel Distribution (AXMEDIS)

作者： P. Bellini P. Nesi DISIT University of Florence Via S. Marta Florence Italy

The digital-content market is urging better pricing and value-for-money for industry products and services. This is clearly evident in the recent price policies of majors. Production costs must be drastically reduced without affecting product quality. content providers, aggregators and distributors constantly need to adopt innovative means of increasing efficiency in order to reduce cost. Possible solutions to this challenge could be found by automating, accelerating and restructuring production processes. AXMEDIS architecture and tools aim at reaching those results by: (i) reducing costs for content production with artificial intelligence algorithms for content composition, formatting, protection and workflow management, (ii) reducing distribution and integration costs, increasing accessibility, with a P2P platform at B2B level integrating content management systems and workflows, (iii) providing algorithms and tools for innovative and flexible digital rights management, exploiting MPEG-21 and overcoming its limits, supporting several business and transactions models. AXMEDIS is a large IST FP6 Integrated Project on Research and Development.

关键词： Grid computing multimedia systems Resource management content management multimedia computing Distributed computing Production systems Marketing and sales Acceleration Optimization methods

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