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

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Universal autosophy data formats for network-centric systems

Universal autosophy data formats for network-centric systems

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conference on Defense Transformation and Network-Centric systems

作者： Holtz, Klaus Holtz, Eric Kalienky, Diana Autosophy 602 Mason 305 San Francisco CA 94108 USA

ISBN: (纸本)0819463051

Conventional platform-centric communication systems are now being replaced by modem network-centric systems such as the packet-switching Internet. A number of problems arise, resulting mainly from the lingering effects of the outdated Shannon information theory. Data has traditionally been communicated in meaningless bit streams according to the Shannon theory. An alternative Autosophy theory communicates data "content" in Internet packets using universal data formats. The new theory evolved from research into self-assembling structures, such as chemical crystals and living trees. Similar natural principles can produce self-assembling data structures that grow in electronic memories without programming -- like data crystals or data trees. The learning algorithms grow hyperspace knowledge libraries for communication and archiving. The advantages include high lossless data compression, unbreakable "codebook" encryption, resistance to transmission errors, universally compatible data formats, and virtual immunity to the Internet's Quality of Service (QoS) problems. A content-based 64bit data format was developed for real-time multimedia Internet communications. Legacy data can be converted to the universal 64bit format using software patches or integrated chipsets. The codes can then be forwarded via any media (cable, radio, satellite, or the Internet) without reformatting. The new data formats could be phased in without disruption to existing communications.

关键词： Autosophy Information theories Omni Dimensional Networks Self-assembling data networks Universal data formats multimedia communication Internet Quality of Service data compression encryption

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A new video images text localization approach based on a fast hough transform

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3rd International conference on Image Analysis and Recognition, ICIAR 2006

作者： Bouaziz, Bassem Mahdi, Walid Hamadou, Abdelmajid Ben MIRACL Multimedia InfoRmation System and Advanced Computing Laboratory Higher Institute of Computer Science and Multimedia BP 1030 Sfax 69042 Tunisia

ISBN: (纸本)3540448918

The amount of digital video data is increasing over the world. It highlights the need for efficient algorithms that can retrieve this data by content. The full use of this media is currently limited by the opaque nature of the video which prevents content-based access. To facilitate video indexing and browsing, it is essential to allow non-linear access, especially for long programs. This can be achieved by identifying semantic description captured automatically from video story structure. Among these descriptions, text within video frames is considered as rich features that enable a good way for browsing video. In this paper we propose a fast Hough transformation based approach for automatic video frames text localization. Experimental results, that we drove on a large sample of video images issued from portions of news broadcasts, sports program, advertisements and movies, shows that our method is very efficient, capable to locate text regions with different character sizes, directions and styles even in case of complex image background. © Springer-Verlag Berlin Heidelberg 2006.

关键词： Image analysis

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Automatic content-based image retrieval using hierarchical clustering algorithms

Automatic content-based image retrieval using hierarchical c...

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IEEE International Joint conference on Neural Network

作者： Jarrah, Kambiz Krishnan, Sri Guan, Ling Ryerson Univ Multimedia Res Lab Signal Anal Res Grp SAR Toronto ON Canada Ryerson Univ Dept Elect & Comp Engn Toronto ON Canada Ryerson Univ SAR Toronto ON Canada Ryerson Univ Canada Res Chair Toronto ON Canada Ryerson Univ RML Toronto ON Canada

ISBN: (纸本)9780780394902

The overall objective of this paper is to present a methology for guiding adaptations of an RBF-based relevance feedback network, embedded in automatic content-based image retrieval (CBIR) systems, through the principle of unsupervised hierarchical clustering. The self-organizing tree map (SOTM) is essentially attractive for our approach since it not only extracts global intuition from an input pattern space but also injects some degree of localization into the discriminitive process such that maximal discrimination becomes a priority at any given resolution. The main focus of this paper is two fold: introducing a new member of SOTM family, the Directed SOTM (DSOTM) that not only provides a partial supervision on cluster generation by forcing division away from the query class, but also presents a flexible verdict on resemblance of the input pattern as its tree structure grows;and modufying the current structure of the normalized graph cuts (Ncut) process by enabling the algorithm to determine appropriate number of clusters within an unknown dataset prior to its recursive clustering scheme through the principle of self-organizing normalized graph cuts (SONcut). Comprehensive comparisionswith the Self-Organizing Feature Map (SOFM), SOTM, and Ncut algorithms demonstrate feasibility of the proposed methods.

关键词： content based retrieval

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aAqua: A database-backended multilingual, multimedia community forum 06

aAqua: A database-backended multilingual, multimedia communi...

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2006 ACM SIGMOD International conference on Management of Data

作者： Ramamritham, Krithi Bahuman, Anil Duttagupta, Subhasri Developmental Informatics Lab. Indian Institute of Technology Mumbai India

ISBN: (纸本)1595934340

aAQUA is an online multilingual, multimedia Agricultural portal for disseminating information from and to rural communities. It answers farmers' queries based on the location, season, crop and other information provided by farmers. aAQUA makes use of novel database systems and information retrieval techniques like intelligent caching, offline access with intermittent synchronization, semantic-based search, etc. aAQUA's large scale deployment provides avenues for researchers to contribute in the areas of knowledge management, cross-lingual information retrieval, and providing accessible content for rural populations. Apart from agriculture, aAQUA can be configured and customized for expert advice in education, healthcare and other domains of interest to a developing population. This demonstration showcases the utility of various component DB/IR technologies built into aAQUA to enhance the QoS delivered to rural populations. Copyright 2006 ACM.

关键词： Database systems

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Cross-layer congestion control, scheduling and power control design in multihop networks with random access

Cross-layer congestion control, scheduling and power control...

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IEEE International conference on multimedia and Expo (ICME 2006)

作者： Long, Chengnian Guan, Xinping Li, Bo Hong Kong Univ Sci & Technol Dept Comp Sci Kowloon Hong Kong Peoples R China Yanshan Univ Dept Elect Engn Qinhuangdao 066004 Hebei Peoples R China

ISBN: (纸本)9781424403660

This paper considers optimal cross-layer rate control, scheduling design and power control for multi-hop wireless networks. The problem of optimal rate control, link scheduling, and link transmission power for all active time slot. is formulated as a network utility maximization problem. In wireless multi-hop networks, the link capacity is a function of link scheduling and transmission power with time-varying and nonlinear properties. Those characteristic poses much challenge in joint design. To solve the non-convex and non-separable nonlinear program problem, a two time-scale distributed optimization approach is presented. By dual decomposition and gradient method, the NUM problem naturally decomposes into three subproblems: congestion control, scheduling design and power control. They interact through congestion price. The global convergence of this algorithm is proven. This paper presents a step towards a systematic approach to jointly design TCP congestion control algorithms, scheduling design and power control.

关键词： Power control Spread spectrum communication Optimal control Algorithm design and analysis Wireless networks Utility programs Gradient methods Convergence Control systems Scheduling algorithm

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An evaluation of flexible macroblock ordering in error-prone environments

An evaluation of flexible macroblock ordering in error-prone...

引用

conference on multimedia systems and Applications IX

作者： Dhondt, Yves Mys, Stefaan Lambert, Peter Van de Walle, Rik Univ Ghent IBBT Dept Elect & Informat Syst Multimedia Lab Gaston Crommenlaan 8 Bus 201 B-9050 Ghent Belgium

ISBN: (纸本)0819464899

With all the hype created around multimedia in the last few years, consumers expect to be able to access multimedia content in a real-time manner, anywhere and anytime. One of the problems with the real-time requirement is that transportation networks, such as the Internet, are still prone to errors. Due to real-time constraints, retransmission of lost data is, more often than not, not an option. Therefore, the study of error resilience and error concealment techniques is of the utmost importance since it can seriously limit the impact of a transmission error. In this paper an evaluation of a part of flexible macroblock ordering, one of the new error resilience techniques in H.264/AVC, is made by analyzing its costs and gains in an error-prone environment. This paper concentrates on the study of flexible macroblock ordering (FMO). More specifically a study of scattered slices, FMO type 1, is made. Our analysis shows that FMO type I is a good tool to introduce error robustness into an H.264/AVC bitstream as long as the QP is higher than 30. When the QP of the bitstream is below 30, the cost of FMO type I becomes a serious burden.

关键词： flexible macroblock ordering FMO type 1 error resilience H.264/AVC scattered slices

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Performance evalaution of uplink CAC for 3G WCDMA wireless networks with multiservices

Performance evalaution of uplink CAC for 3G WCDMA wireless n...

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10th IEEE Singapore International conference on Communications systems, ICCS 2006

作者： Alqahtani, Salman A. Mahmoud, Ashraf S. Sheikh, Asrar U. King Fahd University of Petroleum and Minerals Dhahran 31261 Saudi Arabia

ISBN: (纸本)1424404118

The wide-band code division multiple access (WCDMA) based 3G and beyond cellular mobile wireless networks are expected to provide a diverse range of multimedia services to mobile users with guaranteed quality of service (QoS). Call admission control is a very important measure in WCDMA system to guarantee the quality of the communicating links. Two throughput-based admission control strategy with multi-services, referred to herein as the complete partitioning CAC (CP-CAC) and the queuing priority CAC (QP-CAC), are analyzed and compared. The main contribution of this paper is the development of an analytical model for the QP-CAC algorithm which can be easily extended and used for CP-CAC. We also develop a simulation tool to test and verify our results. Finally, we present numerical examples to demonstrate the performance of the proposed CAC algorithms and we show that analytical and simulation results are in total agreement. © 2006 IEEE.

关键词： multimedia services

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Proportional service differentiation for multichannel wireless networks

Proportional service differentiation for multichannel wirele...

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3rd International conference on Broadband Communications Networks and systems

作者： Pandey, Sugam Niranjan Ganz, Aura Univ Massachusetts Multimedia Networks Lab Amherst MA 01003 USA

ISBN: (纸本)9781424404247

In this paper, we propose Multi-Channel Time Division Multiple access (MC/TDAM) scheme which provides proportional service differentiation while achieving high throughput in a multichannel wireless network. Proportional service diffrentiation is achieved by scheduling traffic over multiple non-overlapping channels using the modified open-shop scheduling problem analogy. This analogy allows us to use known optimal algorithms that have been previously developed for the open-shop scheduling problem. With extensive performance evaluation using OPNET simulator, we show that the proposed MC/TDAM scheme provides proportional service differentiation while achieving high throughput. To the best of our knowledge, this is the first work for provisioning proportional service differentiation in wireless networks using multiple channels.

关键词： multichannel QoS proportional service differentiation adhoc wireless

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SemDAV: A file exchange protocol for the semantic desktop

SemDAV: A file exchange protocol for the semantic desktop

引用

Semantic Desktop and Social Semantic Collaboration Workshop, SemDesk 2006 - Located at the 5th International Semantic Web conference, ISWC 2006

作者： Schandl, Bernhard University of Vienna Department of Distributed and Multimedia Systems Austria

The traditional file system is an integral part of how users interact with their desktop computers: To a great extent, user content (e.g. business documents, holiday pictures, project plans, etc.) is stored in a more or less unstructured manner. In the file system, this content is organized only using hierarchical directories and file names, which lack advanced expressivity in comparison to ontology-based classification schemes. As a result, traditional file systems do not provide sufficient means for organizing and annotating such content, especially when multiple users access the same file inventory. In this position paper, we introduce the SemDAV project1, in which we aim to research technologies that are able to semantically enrich storage of such unstructured content. We give an outline of the SemDAV project, explain the motivation behind it, and discuss how SemDAV can contribute to the Semantic Desktop movement.

关键词： Personal computers

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Requantization transcoding in pixel and frequency domain for intra 16x16 in H.264/AVC

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8th International conference on Advanced Concepts for Intelligent Vision systems

作者： De Cock, Jan Notebaert, Stijn Lambert, Peter De Schrijver, Davy Van de Walle, Rik Univ Ghent IBBT Dept Elect & Informat Syst Multimedia Lab B-9050 Ledeberg Ghent Belgium

ISBN: (纸本)3540446303

In the context of Universal multimedia access, efficient techniques are needed for the adaptation of video content. An important example is the reduction of the bitrate in order to satisfy the bandwidth constraints imposed by the network or the decoding capability of the terminal devices. Requantization transcoding is a fast technique for bitrate reduction, and has been successfully applied in previous video coding standards such as MPEG-2. In this paper, we examine requantization in H.264/AVC, focusing on the intra 16 x 16 prediction modes. Due to the newly introduced coding tools in H.264/AVC, new techniques are needed that are able to lower the bitrate at a minimal quality loss. We propose two novel architectures, one in the pixel domain and one in the frequency domain, that reuse the information from the incoming bitstream in an efficient way, and perform approximately equally well as a cascade of decoder and encoder. Due to their low computational complexity, the introduced architectures are highly suitable for on-the-fly video adaptation scenarios.

关键词： multimedia systems

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