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IEEE International Conference on Acoustics, Speech, and Signal Processing

作者： Zoia, G Alberti, C Ecole Polytech Fed Lausanne Integrated Syst Lab CH-1015 Lausanne Switzerland

ISBN: (纸本)0780370414

The new MPEG-4 Audio standard provides two toolsets for synthetic Audio generation, Audio processing and multimedia content description called Structured Audio (SA) and BInary Format for Scenes (BIFS). Moving from a systematic analysis of SA and from the implementation of an efficient SA decoder, this paper describes the design of a virtual DSP architecture able to exploit the data level parallelism contained in many typical audio processing algorithms. The proposed virtual DSP architecture shows good performance on general purpose platforms and can be easily adapted and optimized for parallel superscalar devices. The porting and results on a V-LIW DSP device confirm the effectiveness and flexibility of the approach, particularly suitable for standalone embedded solutions.

关键词： Digital signal processing

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Toward Wi-Fi AP-Assisted content Prefetching for an On-Demand TV Series: A Learning-Based Approach

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IEEE TRANSACTIONS ON CIRCUITS AND systems FOR VIDEO TECHNOLOGY 2018年第7期28卷 1665-1676页

作者： Hu, Wen Jin, Yichao Wen, Yonggang Wang, Zhi Sun, Lifeng Tsinghua Univ Dept Comp Sci & Technol Tsinghua Natl Lab Informat Sci & Technol Beijing 100084 Peoples R China Nanyang Technol Univ Sch Comp Engn Singapore 639798 Singapore Tsinghua Univ Grad Sch Shenzhen Shenzhen 518055 Peoples R China

The emergence of smart Wi-Fi access points (AP), which are equipped with huge storage space, opens a new research area on how to utilize these resources at the edge network to improve users' quality of experience (e.g., a short startup delay and smooth playback). One important research interest in this area is content prefetching which predicts and accurately fetches contents ahead of users' requests to shift the traffic away during peak periods. However, in practice, the different video watching patterns among users and the varying network connection status lead to the time-varying server load, which eventually makes the content prefetching problem challenging. To understand this challenge, this paper first performs a largescale measurement study on users' AP connection and TV series watching patterns using real traces. Then, based on the obtained insights, we formulate the content prefetching problem as a Markov decision process. The objective is to strike a balance between the increased prefetching and storage cost incurred by incorrect prediction and the reduced content download delay because of successful prediction. A learning-based approach is proposed to solve this problem and another three algorithms are adopted as baselines. In particular, first we investigate the performance lower bound by using a random algorithm and the upper bound by using an ideal offline approach. Then, we present a heuristic algorithm as another baseline. Finally, we design a reinforcement learning algorithm that is more practical to work in the online manner. Through extensive trace-based experiments, we demonstrate the performance gain of our design. Remarkably, our learning-based algorithm achieves a better precision and hit ratio (e.g., 80%) with about 70% (resp. 50%) cost saving compared to the random (resp. heuristic) algorithm.

关键词： Wi-Fi AP content prefetching learning-based approach

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A Comprehensive Study on Various Encryption Techniques for Digital Images in multimedia Networks 2

A Comprehensive Study on Various Encryption Techniques for D...

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2nd IEEE International Conference on Integrated Circuits and Communication systems, ICICACS 2024

作者： Santhosha, Benaka Sudheesh, K.V. Kiran, K. Parameshachari, B.D. Dayanand Sagar University Harohalli Bengaluru Visvesveraya Technological University Department of CSE Belagavi India Vidyavardhaka College of Enginerring Mysuru Visvesveraya Technological University Department of ECE Belagavi India Nitte Meenakshi Institute of Technology Department of ECE Bengaluru India

ISBN: (纸本)9798350317558

Image encryption is a fundamental component of modern data security that guarantees the integrity, privacy, and confidentiality of sensitive visual content. This paper provides a thorough examination of image encryption, comparing and contrasting different encryption techniques and their benefits and limitations as well as real-world uses. In order to strengthen image data security against unwanted access and manipulation, we first offer some basic understanding of image encryption. The suitability of symmetric, asymmetric, and hybrid encryption techniques in various contexts is examined. We also explore the assessment criteria used to evaluate encryption algorithms, highlighting the significance of using suitable measures to precisely gauge security and effectiveness. We also discuss common issues with image encryption, like complicated key management and computational complexity. The review also explores future directions that picture encryption might take, including multi-media encryption techniques, resistance to cryptanalysis, and quantum image encryption. We also highlight how important image encryption is in a variety of fields, such as finance, healthcare, journalism, intellectual property protection, and military operations. We will conduct a thorough analysis of current cryptography schemes and multimedia encryption algorithms to provide a comprehensive overview of the current security landscape tailored to digital multimedia technology. The findings from this survey will enhance our understanding of the efficacy and dependability of secure multimedia encryption schemes, ultimately aiding in the development of more efficient and robust encryption methods for the future. This article aims to summarize and assess numerous algorithms using different methodologies based on multiple characteristics such as MSE, PSNR, NC, BER, and so on. © 2024 IEEE.

关键词： Cryptography Image multimedia Networks Security Attacks Steganography Watermarking

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content-based access of VRML libraries

Content-based access of VRML libraries

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IAPR International Workshop on multimedia Information Analysis and Retrieval, MINAR 1998

作者： Paquet, Eric Rioux, Marc Visual Information Technology Institute for Information Technology National Research Council Building M-50 Montreal Road OttawaONKlA 0R6 Canada

ISBN: (纸本)3540648267

This paper presents a new approach for the classification and retrieval of three-dimensional images and models from databases. A set of retrieval algorithms is introduced. These algorithms are content-based, meaning that the input is not made out of keywords but of three-dimensional models. Tensor of inertia, distribution of normals, distribution of cords and multiresolution analysis are used to describe each model. The database can be searched by scale, shape or color or any combination of these parameters. A user friendly interface makes the retrieval operation simple and intuitive and make it possible to edit reference models according to the specifications of the user. Experimental results using a database of more than 1000 VRML models are presented. © Springer-Verlag Berlin Heidelberg 1998.

关键词： Database systems

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Proceedings of the 9th Workshop on multimedia Metadata, WMM 2009 - Held in Conjunction with the 13th French multimedia Conference on Compression and Representation of Audiovisual Signals, CORESA 2009

Proceedings of the 9th Workshop on Multimedia Metadata, WMM ...

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9th Workshop on multimedia Metadata, WMM 2009 - Held in Conjunction with the 13th French multimedia Conference on Compression and Representation of Audiovisual Signals, CORESA 2009

The proceedings contain 13 papers. The topics discussed include: case studies on context-aware mobile multimedia services;content-based image retrieval systems - reviewing and benchmarking;delivery context descriptions - a comparison and mapping model;a novel tool for quick video summarization using keyframe extraction techniques;authoring interactive mobile services using MPEG-7 and MPEG-4 LASeR;an user study on rich media mobile guide applications;what algorithms for urban routing on mobile devices?;towards the use of multimedia contents to represent events in vehicular ad hoc networks;a multimedia service with MPEG-7 metadata and context semantics;a standards-based generic approach for complex multimedia management;contribution to the modeling of multimedia metadata in a distributed architecture;media center oriented Linux operating system;and a multi-level access control scheme for multimedia database.

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Asymptotic performance of ML channel estimators in WCDMA systems: Randomized codes approach

Asymptotic performance of ML channel estimators in WCDMA sys...

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IEEE International Conference on Acoustics, Speech, and Signal Processing

作者： Mestre, X Fonollosa, JR Univ Politecn Catalunya Dept Signal Theory & Commun ES-08034 Barcelona Spain

ISBN: (纸本)0780370414

This paper analyzes the asymptotic performance of Maximum Likelihood (ML) channel estimation algorithms in wideband code division multiple access (WCDMA) scenarios. We concentrate on systems with periodic spreading sequences (period larger than or equal to the symbol span) with high spreading factors, where the transmitted signal contains a code division multiplexed pilot for channel estimation purposes. Assuming randomized training and code sequences, we derive and compare the asymptotic covariances of the training-only (TO), semi-blind conditional ML (CML) and semi-blind Gaussian ML (GML) channel estimators.

关键词： Code division multiple access

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Logo identification algorithm for TV Internet

Logo identification algorithm for TV Internet

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Federated Conference on Computer Science and Information systems (FedCSIS)

作者： Chodyka, Marta Mosorov, Volodymyr Pope John Paul II Univ Inst Comp Sci Biala Podlaska Poland Lodz Univ Technol Inst Appl Comp Sci Lodz Poland

ISBN: (纸本)9781467344715

content inappropriate for children on Internet television is a serious problem in today's multimedia world. There are numerous methods which are used to control the content of the transmitted television programmes. However, these well-known methods do not solve the above mentioned problem completely. The paper presents a more effective method for automatic identification of the provider's logo based on an original image sequence analysis. The automatic identification of the provider's logo can be used to block access to video programmes of the selected providers. The method has been tested on some chosen video transmissions on-line, achieving over 98% of correct identification.

关键词： Automatic identification Video transmission Web TV Television Television programs Videotapes Image sequence analysis Internets access original image Authentication

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Ethersim: A simulator for wireless and mobile networks

Ethersim: A simulator for wireless and mobile networks

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IEEE GLOBECOM 1996 - Communications: The Key to Global Prosperity

作者： Mishra, P Srivastava, M Agrawal, P Nguyen, G Univ of California at Berkeley Berkeley United States

ISBN: (纸本)0780333373

The paper describes Ethersim, a simulation tool to model and study the performance of integrated service networks that provide multimedia (audio, video, data) information access to mobile users carrying portable wireless terminals and hosts. The design process of such networks requires a proper understanding of how network and multimedia application performance is affected by (i) the choice of algorithms and protocols at various network layers, (ii) the wireless link characteristics, (iii) the presence of mobile hosts, and (iv) the host mobility patterns. Analytic approaches to study these problems suffer from intractability in such complex systems, while the inflexibility of making measurements on testbed systems makes it difficult to draw generalized conclusions. Simulation is an alternative, but available simulators provide poor support, many, for mobility and wireless. Ethersim has been built using a discrete event based simulator core and incorporates models of user applications and transport, network and MAC layer protocols. It provides the capability to specify network topology and host mobility patterns. The software architecture of Ethersim employs five special entities: an air module, a map, a mover, mobile hosts, and basestations. The air module models the physical air-interface effects (e.g., RF power decay, frequency collisions etc.). The mover is a central entity that moves the mobile hosts on the map. Ethersim allows for both random and goal-directed movements of mobile hosts, and also allows synchronized goal-directed movements to model conference room type mobility patterns. We also present case-studies of using Ethersim to model and study the interaction of transport layer, connection rerouting protocol, and radio characteristics in a mobile and wireless ATM network at Bell Laboratories.

关键词： Mobile radio systems

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13th International Conference on Distributed multimedia systems, DMS 2007

13th International Conference on Distributed Multimedia Syst...

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13th International Conference on Distributed multimedia systems, DMS 2007

ISBN: (纸本)1891706217

The proceedings contain 65 papers. The special focus in this conference is on Collaborative multimedia environments, multimedia databases, Distributed multimedia systems/computing I, multimedia software engineering, multimedia for ambient and environment management and Distributed multimedia computing ii. The topics include: Assessing and computing blended and pure learning approaches;a scalable architecture for latency sensitive massively multiplayer online games;E-education to reach the unreached;region based image clustering using distributed K-median clustering;appropriate cutting segments of XML elements for multiple keywords queries;an interactive visualization system for exploring time-series data;a conceptual approach for active surveillance of indoor environments;a self-organizing approach to mission initialization and control in emergency management;a black-box testing method for multi-agent systems;a new browsing model based on AJAX strategies;a method for verifying usability and performance of a multi-user healthcare embedded system;towards a formal semantics for distributed multimedia computing;data normalization and fusion in multibiometric systems;an ambient intelligence application for cultural heritage;an integrated system for easying the access to georeferenced information on the web;exploiting MPEG-21 file format for cross media content;effects of agents communications on system performance in medical organizations;vLab, a virtual laboratory for computer engineering education;multimedia knowledge eclipse environment;distributed E-learning with TAO through eclipse and grid computing;teaching with eclipse through the simulations;improving student’s self-efficacy using an adaptive approach and beyond learning management systems in lifelong learning.

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Multidimensional indexing for content-based image retrieval

Multidimensional indexing for content-based image retrieval

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Proceedings of the 1998 Conference on Electronic Imaging and multimedia systems ii

作者： Zhao, J. Leon Kwok, S.H. Hong Kong Univ of Science and Technology Kowloon Hong Kong

Based on the blobworld method, we propose a blob-centric image querying scheme that is comprised of several new techniques in content-based image retrieval. We report our research results in the database structure and maintenance algorithms for image indexing. We further conduct a performance comparison of image retrieval efficiency for three possible image retrieval methods, the naive method, the representative-blobs method, and the indexing method. Our quantitative analysis shows over 90% reduction in query response time by using the representative-blobs method and the indexing method.

关键词： Pattern matching

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