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EUROMICRO conference

作者： Chung-Ming Huang Yu-Chang Chao Laboratory of Multimedia Networking Department of Computer Science and Information Engineering National Cheng Kung University Tainan Taiwan

ISBN: (纸本)0769512364

With the growth of using World Wide Web (WWW), WWW has become a powerful means of dissemination of information. Thus, the demand for faster, more efficient, and more convenient ways for accessing to WWW are urgently required. Consequently, the heterogeneous I/O client devices, i.e., DTMF telephone sets, fax machines, pocket PCs, cellular phones, note books, desktop computers, are devised to allow users to access to WWW. In order to provide suitable WWW access interfaces, currently, many mark-up languages and systems are proposed for these heterogeneous I/O client devices. As a result, n heterogeneous I/O devices need n mark-up languages and systems using this approach. In this paper, we propose a mark-up language, called Quality of Information Mark-up Language (QIML), and browsing systems to resolve the above problem. With QIML, one can provide suitable and flexible content to heterogeneous client devices, including computers, cellular phones, traditional DTMF telephone sets, and fax machines, using one mark-up language and system. In this way, the overhead for maintaining many web servers for servicing users with heterogeneous I/O client devices can be reduced a lot.

关键词： World Wide Web Cellular phones Personal digital assistants HTML Web pages XML Telephone sets Internet Chaos Telecommunications

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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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Configurable hardware implementation of triple-DES encryption algorithm for wireless local area network

Configurable hardware implementation of triple-DES encryptio...

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International conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： P. Hamalainen M. Hannikainen T. Hamalainen J. Saarinen Digital and Computer Systems Laboratory Tampere University of Technology Tampere Finland

This paper presents three implementations of triple data encryption standard (3DES) algorithm on a configurable platform. Implementations are aimed at the medium access control (MAC) protocol of a multimedia-capable wireless local area network (WLAN). For this reason, very strict timing constraints as well as demands for area-efficiency are present. The MAC processing is handled by a digital signal processor (DSP) and a Xilinx Virtex field programmable gate array (FPGA) chip. The latter one is also used for the presented encryption implementations. As a result of the study, 3DES implementations with small area and reasonable throughput and, on the contrary, with large area and very high throughput are realized. Even though 3DES turns out to be quite large and resource-demanding, the implementations still leave enough chip area for the other MAC functions. Consequently, the set requirements are met and the cipher can be integrated into the system.

关键词： Hardware Cryptography Media access Protocol Wireless LAN Field programmable gate arrays Throughput Signal processing algorithms Wireless application protocol access protocols Timing

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A search engine for remote database-aided interpretation of digitized mammograms

A search engine for remote database-aided interpretation of ...

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Medical Imaging 2001 conference

作者： Ornes, C Valentino, DJ Yoon, HJ Eisenman, JI Sklansky, J Charles R Drew Univ Med & Sci Dept Radiol Los Angeles CA 90059 USA

ISBN: (纸本)0819440094

We describe a query-by-content search engine that enables a radiologist to search a large database of diagnostically-proven ("benign" or "malignant") mammographic regions of interest (ROIs). The database search is facilitated by a relational map which is a two-dimensional display of all the ROIs in the database. Labeled points on the map represent ROIs in the database. The map is constructed from the output of a neural network that has been trained to cluster the ROIs in the database using a measure of perceptual similarity. To use the search facility of our computer-aided diagnosis system a radiologist selects a ROI from a digitized mammogram and submits the ROI as a query to the search engine. The search engine first maps the query ROI to its appropriate location on the relational map. The search engine then retrieves the ROIs that are closest to the query ROI on the relational map. These retrieved ROIs are from the same cluster on the relational map. The results of the search are presented to the radiologist in the form of the retrieved ROIs, along with related information such as biopsy result and patient age. The radiologist can also perform an unrestricted search by selecting any point on the relational map. The search engine will then return the closest ROIs to the selected point. The search engine is implemented using a three-layer distributed architecture. The first layer is a Java-based user interface that allows a radiologist to view a digital mammogram, to enhance the mammogram, to select a ROI, and to query the database. The second layer is a web server that generates HTML for the web client and provides access to the image processing algorithms, the neural network, and the image search functions. The third layer is a remote database containing the ROIs and associated patient information. The embedding of this search engine into an integrated diagnostic system may help the radiologist to incorporate subtle image relationships into the diagnostic process

关键词： query-by-content search engine neural network Java

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Scrambling and key distribution scheme for digital television

Scrambling and key distribution scheme for digital televisio...

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IEEE International conference on Networks

作者： W. Kanjanarin T. Amornraksa Multimedia Communications Laboratory Department of Computer Engineering King Mongkut's University of Technology Thonburi Bangkok Thailand

The scrambling scheme is a part of the conditional access system (CAS) that is used to prevent unauthorized access to Pay-TV systems. We propose a new scrambling scheme and key distribution scheme. The scrambling scheme is used in conjunction with ordinary encryption techniques, for protecting the digital video streams from unauthorized viewing. A hash function and a pseudo-random number generator are used to prepare the video stream before being encrypted. The proposed scheme helps reduce computational time and complexity while providing the same level of security as encrypting the entire video stream. In addition, the proposed secure key distribution scheme can be used with any, scrambling scheme e.g. with our scrambling scheme. By using the Chinese remainder theorem (CRT) for distributing parameters in the scrambling process, the security of the scheme can be increased. Moreover, our scheme can prevent two common problems, namely, smart card cloning and McCormac Hack.

关键词： Digital TV Cryptography Streaming media Security content addressable storage Protection Cathode ray tubes Smart cards Cloning Computer hacking

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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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Designing for semantic access: A video browsing system

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multimedia TOOLS AND APPLICATIONS 2000年第3期11卷 281-293页

作者： Hollfelder, S Everts, A Thiel, U GMD Integrated Publicat & Informat Syst Inst D-64293 Darmstadt Germany

Users of browsing applications often have vague information needs which can only be described in conceptual terms. Therefore, a video browsing system must accept conceptual queries for preselection and offer mechanisms for interactive inspection of the result set by the user. In this paper, we describe a MM-DBMS that we extended with the following components: Our retrieval engine calculates relevance values for the results of a conceptual query by feature aggregation on video shot granularity to offer conceptual, content-based access. To reduce startup delays within sessions, our admission control module admits only complete browsing sessions, if required resources, which are heuristically predicted from query results, are available. In addition, our intelligent client buffer strategy employs the retrieval relevance values to enable flexible user interactions during browsing.

关键词： semantic browsing conceptual video retrieval content-based search semantic buffering session-based admission control

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Tarsys: A system for video archive management

Tarsys: A system for video archive management

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conference on International multimedia Management systems

作者： Larrosa, R Trabado, GP Zapata, EL Univ Malaga Dept Comp Architecture E-29080 Malaga Spain

ISBN: (纸本)0819438758

Tarsys is a video archive system which combines the flexible organization of multimedia databases, the efficiency of real-time filesystems and the scalability of tertiary storage (magnetic tape libraries and optical jukeboxes). Heavy data transfers over the network are usual between video servers and their clients. Tarsys reduces network traffic through the use of a remote manipulation protocol, so that only required fragments of multimedia data are transfered. Tarsys provides a suitable platform for the automatic extraction of content information from multimedia data. It also provides management of content based queries and efficient access to video fragments found by queries. These facilities in the access to archived videos make it ideal for large TV digital archives and scientific databases where it constitutes a platform for quick development of custom video analysis.

关键词： video storage multimedia database digital mpeg streaming

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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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Automatic techniques for insertion of three-dimensional objects into a video sequence

Automatic techniques for insertion of three-dimensional obje...

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

作者： Coorg, SR IBM Corp Thomas J Watson Res Ctr Yorktown Hts NY 10598 USA

ISBN: (纸本)0780365364

Combining 3-D graphics and video to generate a seamless visual stream is an important problem encountered in producing multimedia content. Difficulties in dealing with perspective, occlusion, and illumination make this problem challenging. In this paper, I propose techniques based on standard computer vision algorithms that address perspective and occlusion problems effectively. The key insight employed is that while the general vision problem is difficult to solve, the nature of this application permits simple, effective solutions. I present results of the proposed algorithms on a sample test video sequence.

关键词： multimedia systems

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