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IEEE International Symposium on multimedia

作者： Rajiv Ratn Shah Yi Yu Anwar Dilawar Shaikh Roger Zimmermann School of Computing National University of Singapore Singapore Digital Content and Media Sciences Research Division National Institute of Informatics Tokyo Japan Department of Computer Engineering Delhi Technological University Delhi India NUSRI National University of Singapore Suzhou China

In multimedia-based e - learning systems, the accessibility and searchability of most lecture video content is still insufficient due to the unscripted and spontaneous speech of the speakers. Moreover, this problem becomes even more challenging when the quality of such lecture videos is not sufficiently high. To extract the structural knowledge of a multi-topic lecture video and thus make it easily accessible it is very desirable to divide each video into shorter clips by performing an automatic topic-wise video segmentation. To this end, this paper presents the TRACE system to automatically perform such a segmentation based on a linguistic approach using Wikipedia texts. TRACE has two main contributions: (i) the extraction of a novel linguistic-based Wikipedia feature to segment lecture videos efficiently, and (ii) the investigation of the late fusion of video segmentation results derived from state-of-the-art algorithms. Specifically for the late fusion, we combine confidence scores produced by the models constructed from visual, transcriptional, and Wikipedia features. According to our experiments on lecture videos from *** and NPTEL, the proposed algorithm segments knowledge structures more accurately compared to existing state-of-the-art algorithms. The evaluation results are very encouraging and thus confirm the effectiveness of TRACE.

关键词： Encyclopedias Electronic publishing Internet Visualization Pragmatics Feature extraction

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Fuzzy association rules vs fuzzy associative patterns in defending against web service attacks

Fuzzy association rules vs fuzzy associative patterns in def...

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International Conference on Fuzzy systems and Knowledge Discovery (FSKD)

作者： Gaik-Yee Chana Fang-Fang Chuaa Chien-Sing Leeb Faculty of Computing and Informatics Sunway University Cyberjaya Malaysia Multimedia University Melaka Melaka MY Universiti Tunku Abdul Rahman Petaling Jaya Selangor MY

ISBN: (纸本)9781467376839

This paper presents a fuzzy association rule-based intrusion detection and prevention (FAR IDP) system that is implemented within an e-commerce Web service-based application. This system compares the effectiveness and efficiency of using 20 fuzzy association rules compared to 366 fuzzy associative patterns (FAP) to determine whether to definitely grant access to normal transaction, probably deny access for suspicious transaction or certainly deny access to transactions which may contain malicious inputs or XML content. Experimental results from our FAR IDP system have demonstrated that both rules-based and pattern-based algorithms are able to detect, prevent and predict Web service attacks such as SQL injection, XML injection, DoS and SOAP oversized close to real-time, with detection accuracy of not lower than 99%. There is also a slight difference in terms of time; the transaction time for FAP is almost doubled that of FAR's in ms. Additionally, with a transaction time of less than 0.25ms and a detection accuracy of greater than 99%, our FAR IDP has outperformed many other fuzzy and Web service-based IDP systems.

关键词： XML Association rules Pattern matching Simple object access protocol Intrusion detection Prediction algorithms

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Recent trends in interactive multimedia computing for industry

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CLUSTER COMPUTING-THE JOURNAL OF NETWORKS SOFTWARE TOOLS AND APPLICATIONS 2014年第3期17卷 723-726页

作者： Boutaba, Raouf Chung, Kyung-Yong Gen, Mitsuo Univ Waterloo Sch Comp Sci Waterloo ON N2L 3G1 Canada Sangji Univ Dept Comp Informat Engn Wonju South Korea Natl Tsing Hua Univ Fuzzy Log Syst Inst Hsinchu Taiwan

As the development of IT convergence technology reaches its zenith, data in almost all areas have been developed and operated as knowledge based system after digitalization [1]. Interactive multimedia computing services allow people to access rich multimedia content anytime and anywhere using any device and different access networks. It is anticipated that multimedia services will change the way we operate and interact with the world by developing numerous interesting multimedia applications. Interactive multimedia computing in ubiquitous environment poses many research challenges. One of the challenges is processing overhead in a service environment [2–7]. Therefore, novel techniques, architectures, algorithms, experiences regarding multimedia applications, and industry services should be considered, including the following fundamental issues.

关键词： WORKSTATION clusters (Computer systems) REAL-time computing INFORMATION technology

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Confidentiality-Preserving Image Search: A Comparative Study Between Homomorphic Encryption and Distance-Preserving Randomization

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IEEE access 2014年 2卷 125-141页

作者： Lu, Wenjun Varna, Avinash L. Wu, Min Google Mountain View CA 95014 USA Intel Corp Phoenix AZ 85226 USA Univ Maryland Dept Elect & Comp Engn College Pk MD 20742 USA Univ Maryland Inst Adv Comp Studies College Pk MD 20742 USA

Recent years have seen increasing popularity of storing and managing personal multimedia data using online services. Preserving confidentiality of online personal data while offering efficient functionalities thus becomes an important and pressing research issue. In this paper, we study the problem of content-based search of image data archived online while preserving content confidentiality. The problem has different settings from those typically considered in the secure computation literature, as it deals with data in rank-ordered search, and has a different security-efficiency requirement. Secure computation techniques, such as homomorphic encryption, can potentially be used in this application, at a cost of high computational and communication complexity. Alternatively, efficient techniques based on randomizing visual feature and search indexes have been proposed recently to enable similarity comparison between encrypted images. This paper focuses on comparing these two major paradigms of techniques, namely, homomorphic encryption based techniques and feature/index randomization-based techniques, for confidentiality-preserving image search. We develop novel and systematic metrics to quantitatively evaluate security strength in this unique type of data and applications. We compare these two paradigms of techniques in terms of their search performance, security strength, and computational efficiency. The insights obtained through this paper and comparison will help design practical algorithms appropriate for privacy-aware cloud multimedia systems.

关键词： content based image retrieval secure search secure cloud computing homomorphic encryption visual words min-hash random projection order preserving encryption

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On robustness against JPEG2000: a performance evaluation of wavelet-based watermarking techniques

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multimedia systems 2014年第2期20卷 239-252页

作者： Bhowmik, Deepayan Abhayaratne, Charith Heriot Watt Univ Inst Sensors Signals & Syst Vis Lab Edinburgh EH14 4AS Midlothian Scotland Univ Sheffield Dept Elect & Elect Engn Sheffield S1 3JD S Yorkshire England Univ Sheffield Sheffield S1 3JD S Yorkshire England

With the emergence of new scalable coding standards, such as JPEG2000, multimedia is stored as scalable coded bit streams that may be adapted to cater network, device and usage preferences in multimedia usage chains providing universal multimedia access. These adaptations include quality, resolution, frame rate and region of interest scalability and achieved by discarding least significant parts of the bit stream according to the scalability criteria. Such content adaptations may also affect the content protection data, such as watermarks, hidden in the original content. Many wavelet-based robust watermarking techniques robust to such JPEG2000 compression attacks are proposed in the literature. In this paper, we have categorized and evaluated the robustness of such wavelet-based image watermarking techniques against JPEG2000 compression, in terms of algorithmic choices, wavelet kernel selection, subband selection, or watermark selection using a new modular framework. As most of the algorithms use a different set of parametric combination, this analysis is particularly useful to understand the effect of various parameters on the robustness under a common platform and helpful to design any such new algorithm. The analysis also considers the imperceptibility performance of the watermark embedding, as robustness and imperceptibility are two main watermarking properties, complementary to each other.

关键词： Wavelet-based image watermarking Watermarking evaluation Robustness Scalable coding content adaptation JPEG2000

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ACO-based media content adaptation for e-learning environments

ACO-based media content adaptation for e-learning environmen...

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2014 IEEE International Conference on Computational Intelligence and Virtual Environments for Measurement systems and Applications, CIVEMSA 2014

作者： Shamim Hossain, M. Masud, Mehedi Alelaiwi, Abdulhameed A. Alghamdhi, Abdullah Software Engineering Dept. CCIS King Saud University Riyadh 11451 Saudi Arabia Computer Science Dept. Taif University Saudi Arabia

ISBN: (纸本)9781479926138

The advances of ubiquitous communication infrastructures, the rapid adoption of mobile devices and pervasive computing technologies has allowed e-learning users access to multimedia learning contents in e-learning environments. However, because of the diversity and heterogeneity of the mobile users, their preferences, and the rich multimedia learning content, it is a major challenge for the access of learning content by the desired devices in the e- learning environment to user's satisfaction in terms of QoS demands. In order to alleviate the challenge of learning content mismatch, content adaptation is essential. To this end, we propose an ACO-based multimedia content adaptation approach, which inherits the adoption of ACO-based path selection behavior in the path computation for appropriate learning content customization. We compare our proposed approach with other two competitive algorithms, measure the performance and find that our proposed algorithms outperforms the basic AntNet and Genetic in terms of success rate, latency, runtime comparison and convergence. The performance evaluations are conducted using NetLogo simulation environment. © 2014 IEEE.

关键词： Computer aided instruction

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Using multimedia Ontologies for Automatic Image Annotation and Classification 3

Using Multimedia Ontologies for Automatic Image Annotation a...

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3rd IEEE International Congress on Big Data

作者： Rinaldi, Antonio M. Univ Naples Federico II DIETI Dipartimento Ingn Elettr & Tecnol Informaz I-80125 Naples Italy Univ Naples Federico II IKNOS LAB Intelligent & Knowledge Systems LUPT I-80134 Naples Italy

ISBN: (纸本)9781479950577

In the era of big data, the use of formal models and techniques to represent and manage information is a necessary task to implement efficient intelligent information systems. In this paper we propose a complete framework to annotate and categorize images. Our approach is based on multimedia ontologies organized following a formal model to represent knowledge. Our ontologies use multimedia data and linguistic properties to bridge the gap between the target semantic classes and the available low-level multimedia descriptors. The multimedia features are automatically extracted using algorithms based on MPEG-7 standard. The informative image content is annotated with semantic information extracted from our ontologies and the categories are dynamically built by means of a general knowledge base. Experimental results show the efficiency of our approach in the annotation and classification tasks using a combination of textual and visual components.

关键词： multimedia ontologies OWL Semantic Networks

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A hybrid metaheuristic approach to optimize the content transmission in multimedia systems 11

A hybrid metaheuristic approach to optimize the content tran...

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11th International Conference on Informatics in Control, Automation and Robotics, ICINCO 2014

作者： Gómez, Arthur T. Nesi, Luan C. Martins, Marcio G. Chiwiacowsky, Leonardo D. Master Program on Applied Computing University of the Sinos Valley Av. Unisinos 950 São Leopoldo/RS Brazil

ISBN: (纸本)9789897580390

The advent of the digital television in Brazil has allowed users to access interactive channels. Once interactive channels are available, the users are able to find multimedia content such as movies and breaking news programs, to send and/or receive emails, to access interactive applications and also other contents. In this context, a high demand of requests from users is expected. Therefore, from the content provider's point of view, the determination of transmission parameters is needed in order to ensure the best quality of transmission to every user. The aforementioned identification problem is modelled as an optimization problem and a solution procedure based on metaheuristic techniques is proposed. Genetic Algorithm and Tabu Search metaheuristics are employed separately and coupled in a hybrid scheme to define the best transmission policy, optimizing the transmission parameters, such as audio and video transmission rates. Based on the experimental results, the hybrid algorithm has produced better solutions which meet the quality requirements.

关键词： Genetic algorithms

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Advanced Rate Adaptation Algorithm in Video Streaming Over HTTP 4

Advanced Rate Adaptation Algorithm in Video Streaming Over H...

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4th IEEE International Conference on Consumer Electronics Berlin (ICCE-Berlin)

作者： Kovacevic, Jelena Miljkovic, Goran Mihic, Velibor Lazic, Krsto Fac Tech Sci Dept Comp Engn & Commun Novi Sad Serbia RT RK Comp Based Syst Novi Sad Serbia

ISBN: (纸本)9781479961658

In order to guarantee the best user experience throughout different network access technologies with dynamically varying network conditions, it is fundamental to enable proper reception of the multimedia content. To overcome the limitations/deficiencies of evaluated adaptive streaming algorithms (such as slow rate adaptation at stable network conditions), we propose an Advanced Rate Adaptation algorithm (ARA, in the following text) and test it under various network scenarios. The algorithm is implemented as a part of the MPEG DASH compliant client.

关键词： IP networks hypermedia transport protocols video streaming MPEG DASH compliant client advanced rate adaptation algorithm dynamic adaptive streaming over HTTP dynamically varying network multimedia content Adaptive systems Bandwidth Bit rate Delays Heuristic algorithms History Streaming media

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Comparison of compression efficiency between HEVC/H.265 and VP9 based on subjective assessments 37

Comparison of compression efficiency between HEVC/H.265 and ...

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Conference on Applications of Digital Image Processing XXXVii

作者： Rerabek, Martin Ebrahimi, Touradj Ecole Polytech Fed Lausanne Multimedia Signal Proc Grp MMSPG Lausanne Switzerland

ISBN: (纸本)9781628412444

Current increasing effort of broadcast providers to transmit UHD (Ultra High Definition) content is likely to increase demand for ultra high definition televisions (UHDTVs). To compress UHDTV content, several alternative encoding mechanisms exist. In addition to internationally recognized standards, open access proprietary options, such as VP9 video encoding scheme, have recently appeared and are gaining popularity. One of the main goals of these encoders is to efficiently compress video sequences beyond HDTV resolution for various scenarios, such as broadcasting or internet streaming. In this paper, a broadcast scenario rate-distortion performance analysis and mutual comparison of one of the latest video coding standards H.265/HEVC with recently released proprietary video coding scheme VP9 is presented. Also, currently one of the most popular and widely spread encoder H.264/AVC has been included into the evaluation to serve as a comparison baseline. The comparison is performed by means of subjective evaluations showing actual differences between encoding algorithms in terms of perceived quality. The results indicate a dominance of HEVC based encoding algorithm in comparison to other alternatives if a wide range of bit-rates from very low to high bit-rates corresponding to low quality up to transparent quality when compared to original and uncompressed video is considered. In addition, VP9 shows competitive results for synthetic content and bit-rates that correspond to operating points for transparent or close to transparent quality video.

关键词： High Efficiency Video Coding (HEVC) Advanced Video Coding (AVC) VP9 WebM subjective quality assessment coding efficiency

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