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WCDMA for UMTS : radio access for third generation mobile communications / 2nd ed.

2002年

作者： edited by Harri Holma and Antti Toskala.

ISBN: (纸本)0470844671

From the Publisher: WCDMA for UMTS is the only reference available which provides a complete picture of the Wideband CDMA (Code Division Multiple access) air interface of the 3rd generation cellular systems - UMTS (Universal Mobile Telecommunication System). WCDMA is designed for multimedia communications including high quality images and video, and access to services with high data rates. These capabilities will create new business opportunities for manufacturers, operators and for the providers of content and applications. Explains the key parts of the 3GPP/WCDMA standard and provides guidelines for its efficient use Presents network dimensioning and coverage and capacity planning of WCDMA Introduces radio resource management algorithms in the WCDMA network Examines the coverage and capacity of WCDMA up to 2Mbps using numerous simulation results Introduces the TDD (Time Divisions Duplex) mode Discusses the co-existence of TDD and FDD (Frequency Divisions Duplex) and highlights their main differences The second edition contains 50 new pages and features the following updates, enabling this reference to remain as the leading text in the area: HSDPA (High Speed Downlink Packet Data) BTS and UE performance requirements WCDMA1900: WCDMA for the Americas market IP transport Location techniques

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Standards compliant watermarking for access management

Standards compliant watermarking for access management

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Conference on multimedia systems and Applications IV

作者： Ratnakar, V Guleryuz, OG Epson Palo Alto Lab Palo Alto CA 94304 USA

ISBN: (纸本)0819442429

We present standards-compliant visible watermarking schemes for digital images and video in DCT-based compressed formats. The watermarked data is in the same compressed format as the original and can be viewed with standard tools and applications. Moreover, for most of the schemes presented, the watermarked data has exactly the same compressed size as the original. The watermark can be inserted and removed using a key for applications requiring content protection. The watermark application and removal algorithms are very efficient and exploit some features of compressed data formats (such as JPEG and MPEG) which allow most of the work to be done in the compressed domain.

关键词： visible watermarks scrambler discrete cosine transform JPEG MPEG content protection

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Intelligent systems for video analysis and access over the Internet

Intelligent systems for video analysis and access over the I...

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作者： Zhou, Wensheng University of Southern California

学位级别：Ph.D.

This dissertation presents a solution to problems arising from the demand for fast information access and for sharing in real-time multimedia transmission over the Internet. Our solution exploits software agents that are placed throughout the network environment. These hierarchical video analysis agents process multimedia streams in real time, and automatically decompose and understand the multimedia content so as to facilitate information access and sharing. multimedia content contains both the perceptual content such as color, motion, or acoustic features and the conceptual content, which is specified based on concepts or semantics that can be expressed by text descriptions. Both types of contents are embedded simultaneously in multimedia streams, and usually are complementary to each other. This dissertation adaptively analyzes both kinds of video contents by combining mixed media cues from audio, video and text. First, a high-performance module for on-line video segmentation based on scene-change detection is developed. It serves as the first step of any video stream construction and analysis. To meet the high computational demand, our proposed video scene change detection algorithms are very efficient while maintaining high accuracy and recall rates for fast on-line video analysis. Second, the perceptual features of audio and video data are analyzed in a bottom-up manner and integrated so as to discriminate among the different events in any video stream effectively. An efficient decision-tree learning algorithm is used to induce a set of if-then rules which link perceptual features with the video conceptual semantic contents. These rules not only serve as a video classifier, but also guide on-line real-time video/audio feature extraction and data redistribution. A novel knowledge-based system, where knowledge is stored as learned rules, is proposed to serve as a video semantic inference/classification engine. Third, we propose a hierarchical video categorizatio

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Adaptive and multimodal approach to multimedia content analysis

Adaptive and multimodal approach to multimedia content analy...

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作者： Liu, Zhu Polytechnic University

学位级别：Ph.D.

The volume of multimedia data generated nowadays is exploding. To efficiently access and retrieve desired information, tools that enable automated analysis based on content are becoming indispensable. multimedia content is defined at both perceptual and conceptual levels. The former refers to the content characterized purely by intrinsic perception properties such as color, motion, or acoustic features. The latter refers to the content that is specified based on concepts or semantics such as sunset, anchors, or news headline stories. At both levels, the content is embedded in multiple forms that are usually complimentary to each other. The main objective of this thesis is to adaptively analyze the multimedia content by integrating cues from multiple modalities, including audio, video, and text, mainly in the scope of news broadcast. At the perceptual level, news broadcast data is segmented and classified into different video events such as news reporting and commercials. Audio and visual features are developed and integrated, aiming at discriminating different events effectively. Various classification mechanisms, including linear fuzzy threshold, maximum likelihood using Gaussian Mixture Model and Hidden Markov Model, Neural Network, as well as Support Vector Machine, are benchmarked. At the conceptual level, algorithms and demonstration systems for three applications are developed. In News Broadcast Browsing System, recovering and presentation of the embedded hierarchy structure of news broadcast are addressed. Important semantic objects such as hosting characters and headline news stories are adaptively extracted using the audio/visual models that are bootstrapped from on-line data. The problem of efficient search and retrieval of segmented multimedia objects based on audio is discussed in Query-by-example in Audio System. A distance metric framework is proposed to determine the difference of mixture type Probability Density Functions, and is applied in measuring

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Feature representation and compression for content-based retrieval

Feature representation and compression for content-based ret...

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Conference on Visual Communications and Image Processing 2001

作者： Xie, H Ortega, A Univ So Calif Dept Elect Engn Syst Integrated Media Syst Ctr Los Angeles CA 90089 USA

ISBN: (纸本)0819439886

In semantic content-based image/video browsing and navigation systems, efficient mechanisms to represent and manage a large collection of digital images/videos are needed. Traditional keyword-based indexing describes the content of multimedia data through annotations such as text or keywords extracted manually by the user from a controlled vocabulary This textual indexing technique lacks the flexibility of satisfying various kinds of queries requested by database users and also requires huge amount of work for updating the information. Current content-based retrieval systems often extract a set of features such as color, texture, shape motion, speed, and position from the raw multimedia data automatically and store them as content descriptors. This content-based metadata differs from text-based metadata in that it supports wider varieties of queries and can be extracted automatically, thus providing a promising approach for efficient database access and management. When the raw data volume grows very large, explicitly extracting the content-information and storing it as metadata along with the images will improve querying performance since metadata requires much less storage than the raw image data and thus will be easier to manipulate. In this paper we maintain that storing metadata together with images will enable effective information management and efficient remote query. We also show, using a texture classification example, that this side information can be compressed while guaranteeing that the desired query accuracy is satisfied. We argue that the compact representation of the image contents not only reduces significantly the storage and transmission rate requirement, but also facilitates certain types of queries. algorithms are developed for optimized compression of this texture feature metadata given that tile goal is to maximize tile classification performance for a given rate budget.

关键词： metadata content-based retrieval texture classification compression bit allocation

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WCDMA for UMTS : radio access for third generation mobile communications /

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2001年

作者： Holma Harri

ISBN: (纸本)0471486876

From the Publisher: WCDMA for UMTS provides a complete picture of the Wideband CDMA (Code Division Multiple access) air interface of the 3rd generation cellular systems - UMTS (Universal Mobile Telecommunications systems). WCDMA is designed for multimedia communications including high quality images and video, and access to services with high data rates. These capabilities will create new business opportunities for manufacturers, operators and for the providers of content and applications. * Explains the key parts of the WCDMA standard and provides guidelines for its efficient use * Presents network dimensioning and coverage and capacity planning of WCDMA * Introduces radio resource management algorithms in the WCDMA network * Examines the coverage and capacity of WCDMA up to 2Mbps using numerous simulation results * Introduces the TDD (Time Divisions Duplex) mode * Discusses the co-existence of TDD and FDD (Frequency Divisions Duplex) and highlights their main differences Now includes the main modifications made to the 3GPP standard up until the end of 2000 and features the following new material: * Reference terminal classes * Current status of UMTS licensing * Capacity upgrade paths and capacity per km2 * Inter-frequency handovers and inter-system handovers to GSM * Antenna diversity gain measurements in the WCDMA experimental system Written by leading experts in the field, this practical approach to the key features in WCDMA will have wide-ranging appeal to Research and Development Engineers, Practising Engineers, Cellular Operators, Technical Managers and Students on Telecommunications courses.

关键词： Code division multiple access. Wireless communication systems Standards. Mobile communication systems Standards. Global system for mobile communications.

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Time split linear quadtree for indexing image databases

Time split linear quadtree for indexing image databases

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IEEE International Conference on Image Processing

作者： T. Tzouramanis M. Vassilakopoulos Y. Manolopoulos Lab of Data Engineering Department of Informatics Aristotle University of Thessaloniki Thessaloniki Greece

The time split B-tree (TSBT) is modified for indexing a database of evolving binary images. This is accomplished by embedding ideas from linear region quadtrees that make the TSBT able to support spatio-temporal query processing. To improve query performance, additional pointers are added to the leaf-nodes of the TSBT. The resulting access method is called time split linear quadtree (TSLQ). algorithms for processing five spatio-temporal queries have been adapted to the new structure. Such queries appear in multimedia systems, or geographical information systems (GIS), when searched by content. The TSLQ was implemented and results of extensive experiments on query time performance are presented, indicating that the proposed algorithmic approaches outbalance respective straightforward algorithms. The region data sets used in the experiments were real images of meteorological satellite views and synthetic raster images.

关键词： Indexing Image databases multimedia systems Design automation Pixel Data engineering Informatics Information systems Meteorology Satellites

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International Conferences on Info-tech and Info-net (ICII)

作者： Hualin Wan Hong Hu Zhongzhi Shi Lab of Intelligent Information Processing Institute of Computing Technology Chinese Academy and Sciences China

There is an urgent need for effective content-based image retrieval (CBIR) systems, and we believe the key to effective CBIR performance lies in the ability to access the image at the level of objects. Motivated by these considerations, we propose a region-based image retrieval system using max weighted bipartite matching, which can successfully solve the similarity measure of a multi-region image. The retrieval involves two stages: first, the images are segmented based on perceptual color homogeneity, for each color region, color, texture, scale, location and shape characteristics are used to represent the content of regions. Second, the max weighted bipartite matching scheme is used to measure the similarity between images. Experimental results show that a region-based approach can retrieve more relevant and more accurate images.

关键词： Weight measurement Image segmentation Image retrieval content based retrieval multimedia databases Clustering algorithms Color Shape measurement Information processing Computers

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Information access in multimedia databases based on feature models

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NEW GENERATION COMPUTING 2000年第4期18卷 323-339页

作者： De Vries, AP Windhouwer, M Apers, PMG Kersten, M CWI NL-1098 SJ Amsterdam Netherlands Univ Twente NL-7500 AE Enschede Netherlands

With the increasing popularity of the WWW, the main challenge in computer science has become content-based retrieval of multimedia objects. access to multimedia objects in databases has long been limited to the information provided in manually assigned keywords. Now, with the integration of feature-detection algorithms in database systems software, content-based retrieval can be fully integrated with query processing. We describe our experimentation platform under development, making database technology available to multimedia. Our approach is based on the new notion of feature databases. Its architecture fully integrates traditional query processing and content-based retrieval techniques.

关键词： information access multimedia databases query processing content-based retrieval

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Using category-based collaborative filtering in the Active WebMuseum

Using category-based collaborative filtering in the Active W...

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1st IEEE International Conference on multimedia and Expo (ICME2000)

作者： Kohrs, A Merialdo, B Inst EURECOM Dept Multimedia Commun F-06904 Sophia Antipolis France

ISBN: (纸本)0780365364

Collaborative filtering is an important technology for creating user-adapting Web sites. In general the efforts of improving filtering algorithms and using the predictions for the presentation of filtered objects are decoupled. Therefore, common measures (or metrics) for evaluating collaborative filtering (recommender) systems focus mainly on the prediction algorithm. It is hard to relate the classic measurements to actual user satisfaction because of the way the user interacts with the recommendations, determined by their representation, influences the benefits for the user. We propose an abstract access paradigm, which can be applied to the design of filtering systems, and at the same time formalizes the access to filtering results via multi-corridors (based on content-based categories). This leads to new measures which better relate to the user satisfaction. We use these measures to evaluate the use of various kinds of multi-corridors for our prototype user-adapting Web site the: Active WebMuseum.

关键词： Computer supported cooperative work

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