Dissertations / Theses: 'Multimedia applications'

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Georghiades, P. A. "Sound in multimedia applications." Thesis, Swansea University, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.637043.

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Multimedia - the integration under computer control of text, still and moving images and sound, as well as the integration at another level of broadcasting, publishing and information technology - has already begun to change, and is doubtless about to change even further, the way in which information is presented, whether for education and training, business or pleasure. As with every new form of communication in its early stages of development, multimedia will inevitably go through a period of unexpected discoveries, but also of experimentation and consequent mistakes. One of the main aims of this thesis is to attempt to show, indirectly and directly, that the number of potential mistakes in the area of the use of sound in multimedia applications can be reduced by approaching the subject in an informed way, that is, by calling on the growing literature on the subject. Essentially, the thesis is therefore a critical review of the relevant literature, combined with some theoretical conclusions, and a practical guide to sound for the multimedia designer/producer. This practical guide is developed fully in the final chapter, after looking in detail at speech, music, sound effects and some other factors bearing on the subject.

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Swiderski, Zoe. "Content Control for Multimedia Applications." Thesis, Lancaster University, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.504203.

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Salamí, San Juan Esther. "Optimizing VLIW architectures for multimedia applications." Doctoral thesis, Universitat Politècnica de Catalunya, 2007. http://hdl.handle.net/10803/6002.

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The growing interest that multimedia processing has experimented during the last decade is motivating processor designers to reconsider which execution paradigms are the most appropriate for general-purpose processors. On the other hand, as the size of transistors decreases, power dissipation has become a relevant limitation to increases in the frequency of operation. Thus, the efficient exploitation of the different sources of parallelism is a key point to investigate in order to sustain the performance improvement rate of processors and face the growing requirements of future multimedia applications. We belief that a promising option arises from the combination of the Very Long Instruction Word (VLIW) and the vector processing paradigms together with other ways of exploiting coarser grain parallelism, such as Chip MultiProcessing (CMP).

As part of this thesis, we analyze the problem of memory disambiguation in multimedia applications, as it represents a serious restriction for exploiting Instruction Level Parallelism (ILP) in VLIW architectures. We state that the real handicap for memory disambiguation in multimedia is the extensive use of pointers and indirect references usually found in those codes, together with the limited static information available to the compiler on certain occasions. Based on the observation that the input and output multimedia streams are commonly disjointed memory regions, we propose and implement a memory disambiguation technique that dynamically analyzes the region domain of every load and store before entering a loop, evaluates whether or not the full loop is disambiguated and executes the corresponding loop version. This mechanism does not require any additional hardware or instructions and has negligible effects over compilation time and code size. The performance achieved is comparable to that of advanced interprocedural pointer analysis techniques, with considerably less software complexity. We also demonstrate that both techniques can be combined to improve performance.

In order to deal with the inherent Data Level Parallelism (DLP) of multimedia kernels without disrupting the existing core designs, major processor manufacturers have chosen to include MMX-like µSIMD extensions. By analyzing the scalability of the DLP and non-DLP regions of code separately in VLIW processors with µSIMD extensions, we observe that the performance of the overall application is dominated by the performance of the non-DLP regions, which in fact exhibit only modest amounts of ILP. As a result, the performance achieved by very wide issue configurations does not compensate for the related cost. To exploit the DLP of the vector regions in a more efficient way, we propose enhancing the µSIMD -VLIW core with conventional vector processing capabilities. The combination of conventional and sub-word level vector processing results in a 2-dimensional extension that combines the best of each one, including a reduction in the number of operations, lower fetch bandwidth requirements, simplicity of the control unit, power efficiency, scalability, and support for multimedia specific features such as saturation or reduction. This enhancement has a minimal impact on the VLIW core and reaches more parallelism than wider issue µSIMD implementations at a lower cost. Similar proposals have been successfully evaluated for superscalar cores. In this thesis, we demonstrate that 2-dimensional Vector-µSIMD extensions are also effective with static scheduling, allowing for high-performance cost-effective implementations.

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Dao, Trong Nghia Electrical Engineering &amp Telecommunications Faculty of Engineering UNSW. "Modelling 802.11 networks for multimedia applications." Publisher:University of New South Wales. Electrical Engineering & Telecommunications, 2008. http://handle.unsw.edu.au/1959.4/41222.

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This thesis is concerned with the development of new mathematical models for the IEEE 802.11??s access mechanisms, with a particular focus on DCF and EDCA. Accurate mathematical models for the DCF and EDCA access mechanisms provide many benefits, such as improved performance analysis, easier network capacity planning, and robust network design. A feature that permeates the work presented in this thesis is the application of our new models to network environments where both saturated and non-saturated traffic sources are present. The scenario in which multiple traffic sources are present is more technically challenging, but provides for a more realistic setting. Our first contribution is the development of a new Markov model for non-saturated DCF in order to predict the network throughput. This model takes into account several details of the protocol that have been hitherto neglected. In addition, we apply a novel treatment of the packet service time within our model. We show how the inclusion of these effects provides more accurate predictions of network throughput than earlier works. Our second contribution is the development of a new analytical model for EDCA, again in order to predict network throughput. Our new EDCA model is based on a replacement of the normal AIFS parameter of EDCA with a new parameter more closely associated with DCF. This novel procedure allows EDCA to be viewed as a modified multi-mode version of DCF. Our third contribution is the simultaneous application of our new Markov models to both the non-saturated and the saturated regime. Hitherto, network throughput predictions for these regimes have required completely separate mathematical models. The convergence property of our model in the two regimes provides a new method to estimate the network capacity of the network. Our fourth contribution relates to predictions for the multimedia capacity of 802.11 networks. Our multimedia capacity analysis, which is based on modifications to our Markov model, is new in that it can be applied to a broad range of quality of service requirements. Finally, we highlight the use of our analysis in the context of emerging location-enabled networks.

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Bates, John. "Presentation support for distributed multimedia applications." Thesis, University of Cambridge, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.319546.

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Schremmer, Claudia. "Multimedia applications of the wavelet transform." [S.l. : s.n.], 2002. http://www.bsz-bw.de/cgi-bin/xvms.cgi?SWB10605021.

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Al-Rajab, Moaath. "Hand gesture recognition for multimedia applications." Thesis, University of Leeds, 2008. http://etheses.whiterose.ac.uk/607/.

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Hand gesture is potentially a very natural and useful modality for human-machine interaction. It is considered to be one of the most complicated and interesting challenges in computer vision due to its articulated structure and environmental variations. Solving such challenges requires robust hand detection, feature description, and viewpoint invariant classification. This thesis introduces several steps to tackle these challenges and applies them in a hand-gesture-based application (a game) to demonstrate the proposed approach. Techniques on new feature description, hand gesture detection and viewpoint invariant methods are explored and evaluated. A normal webcam is used in the research as input device. Hands are segmented using pre-trained skin colour models and tracked using the CAMShift tracker. Moment invariants are used as a shape descriptor. A new approach utilising the Zernike Velocity Moments (ZVMs, first introduced by Shutler and Nixon [1,2]), is examined on hand gestures. Results obtained using the ZVMs as spatial-temporal descriptor are compared to an HMM with Zemike moments (ZMs). Manually isolated hand gestures are used as input to the ZVM descriptor which generates vectors of features that are classified using a regression classifier. The performance of ZVM is evaluated using isolated, user-independent and user-dependent data. Isolating (segmenting) the gesture manually from a video stream for gesture recognition is a research proposition only and real life scenarios require an automatic hand gesture detection mechanism. Two methods for detecting gestures are examined. Firstly, hand gesture detection is performed using a sliding window which segments sequences of frames and then evaluates them against pre-trained HMMs. Secondly, the set of class-specific HMMs is combined into a single HMM and the Viterbi algorithm is then used to find the optimal sequence of gestures. Finally, the thesis proposes a flexible application that provides the user with options to perform the gesture from different viewpoints. A usable hand gesture recognition system should be able to cope with such viewpoint variations. To solve this problem, a new approach is introduced which makes use of 3D models of hand gestures (not postures) for generating projections. A virtual arm with 3D models of real hands is created. After that, virtual movements of the hand are simulated using animation software and projected from different viewpoints. Using a multi-Gaussian HMM, the system is trained on the projected sequences. Each set of hand gesture projections is marked with its specific class and used to train the single multi-class HMNI with gestures across different viewpoints.

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Javaid, Haris Computer Science &amp Engineering Faculty of Engineering UNSW. "Design methodologies for pipelined MPSoCs targeting multimedia applications." Awarded by:University of New South Wales. Computer Science & Engineering, 2009. http://handle.unsw.edu.au/1959.4/44597.

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The semiconductor industry has seen a paradigm shift from Application Specific Integrated Circuits to Multiprocessor System on Chip systems over the last decade, primarily due to the miniaturization of the transistor. However, billion of transistors available on a single chip need to be used efficiently to provide more functionalities in portable devices, yet minimize power and chip area, which increases the design complexity of multiprocessor systems. Tighter time to market deadlines further pressurizes the designer, requiring a comprehensive automation of the design process of such complex multiprocessor systems. This thesis presents a design automation methodology for the design of Multiprocessor System on Chip (MPSoC) systems for multimedia applications. This thesis introduces a heterogeneous multiprocessor system where processing elements are connected in a pipelined fashion. A multimedia application is executed very efficiently on a pipelined system due to the stream oriented data flow nature of such applications. Application Specific Instruction set Processors (ASIPs) are used as the elementary processing elements in the multiprocessor system as they can be customized according to the application tasks assigned to them. The problem of selecting a processor configuration for each of the ASIPs in the pipelined system is formalized. We present three different techniques to select processor configurations by exploring the design space of an ASIP based pipelined system, and integrating them into a flexible and designer driven design flow for efficient exploration of large design spaces in order of 10^16 design points. The first two techniques are based on Integer Linear Programming (ILP), named Exact ILP formulation (EIF) and Reduced ILP formulation (RIF), while the third technique is based on a novel heuristic. We also developed a design space pruning algorithm that can enable the use of EIF and RIF to obtain optimal or near optimal design points from large design spaces. For four multimedia applications, we show that RIF and the heuristic can explore the design space and reveal the Pareto front in several hours, while EIF took several days to obtain the Pareto front. The quick availability of the Pareto front of a design space will help the designer to make early changes in the design. Furthermore, it is shown that, on average, the error incurred by RIF and the heuristic is within 1.25% and 2.25% of the optimal design points obtained via EIF for all the four multimedia applications. In the worst case, RIF introduced an error of 17.08% while the heuristic had an error of 11.39%.

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Pleuss, Andreas. "Model-Driven Development of Interactive Multimedia Applications." Diss., lmu, 2009. http://nbn-resolving.de/urn:nbn:de:bvb:19-114969.

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Erbad, Aiman. "Real-time support for interactive multimedia applications." Thesis, University of British Columbia, 2012. http://hdl.handle.net/2429/42878.

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Emerging interactive multimedia applications, such as real-time visualizations, animations, on-line games, virtual reality, and video conferencing have low latency interactions and continuous high resource (e.g., CPU processing and network bandwidth) demands. The combination of latency sensitive interactions and high resource demands is challenging for best-effort platforms, such as the Internet, general-purpose operating systems and Web browsers because these platforms have no timing or resource guarantees and tend to favor high utilization. When demands exceed available resources, it is impossible to process all computations and data in a timely fashion resulting in diminished perceived quality (e.g., frame rate) and brittle real-time performance. The mismatch between application demands and available resources is observed to varying degrees in all resources including network, processing, and storage. To deal with the volatility and shortage of resources, we build upon and extend the Priority-Progress quality adaptation model. Our approach enables applications to scale demands (up or down) based on available resources and to utilize the limited resources in processing the computations and data with more influence over perceived quality. We develop enhancement layers to improve timeliness and guarantee more consistent quality using quality adaptation while maintaining the strengths of the existing best-effort transports and execution platforms. DOHA, our execution layer, extends the Priority-Progress CPU adaptation to work in games and across multiple execution threads. The modified game has better timing, higher perceived quality, and linearly scalable quality with a small number of cores. Our transport layer, Paceline, introduces low latency techniques over TCP and exposes Priority-Progress adaptation as an essential transport feature improving upon TCP's end-to-end latency while preserving its fairness and utilization.

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Pappas, George H. "Multimedia applications in management and ITM curriculum." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1994. http://handle.dtic.mil/100.2/ADA293077.

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Thesis (M.S. in Information Techonology Management) Naval Postgraduate School, December 1994.
Thesis advisor(s): Shu Liao, Gail Fann Thomas. "December 1994." Bibliography: p. 205-206. Also available online.

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Wu, Min. "Multimedia data transmission for mobile wireless applications." Diss., Columbia, Mo. : University of Missouri-Columbia, 2005. http://hdl.handle.net/10355/4132.

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Thesis (Ph. D.)--University of Missouri-Columbia, 2005.
The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file viewed on (November 14, 2006) Vita. Includes bibliographical references.

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Feichtenschlager, Kajetan, and Petr Knopp. "Analysis of Multimedia Networks for Automotive Applications." Thesis, Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE), 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-659.

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Automotive manufacturers face interesting challenges as electronic devices are becoming essential in modern vehicles. Therefore new approaches and strategies are to be adopted in order to tackle the coming challenges. One of the most rapidly growing domains is infotainment and telematics, where applications require a large amount of data to be transmitted on-board and also exchanged with the external world. The in-vehicle communication networks for infotainment systems must consequently be devised considering the need for transporting the considerable amount of data of multimedia applications as well as features particular to this area.

This thesis is intended to analyze possible implementations of multimedia networks for heavy transport vehicles, in relation to various aspects and features in this area. The thesis presents an analysis of different protocols and technologies used in automotive multimedia networks. Furthermore, characteristic requirements for automotive electronics systems and especially for automotive multimedia networks are investigated in detail. Based on these requirements different multimedia networks are proposed and studied, making a comparison between them with regard to a number of criteria.

A broad approach during the investigation of the multimedia protocols is chosen in order to enlarge the area of used technology and to bring new technologies and possibilities for the truck industry. The observations and the experiences from the car industry are used in the truck domain, where the specifics of the truck industry are taken into account. The comparison gives an insight into the particulars of the proposed solutions from several viewpoints so that a suitable multimedia network can be selected based on different criteria.

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McFadden, Steven B. "Multimedia applications of three-dimensional digital filters." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0030/MQ65382.pdf.

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Lohse, Marco. "Network-integrated multimedia middleware, services, and applications /." Saarbrücken : VDM Verlag Dr. Müller, 2007. http://deposit.d-nb.de/cgi-bin/dokserv?id=3057866&prov=M&dok_var=1&dok_ext=htm.

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Lohse, Marco. "Network integrated multimedia middleware, services, and applications." Saarbrücken VDM Verlag Dr. Müller, 2005. http://d-nb.info/987144383/04.

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Youn, Jeongnam. "Video transcoder architectures for networked multimedia applications /." Thesis, Connect to this title online; UW restricted, 2000. http://hdl.handle.net/1773/6117.

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Aksoy, Cumhur Ercument. "Wireless thin client optimization for multimedia applications." [Florida] : State University System of Florida, 2000. http://etd.fcla.edu/etd/uf/2000/amt2363/Tez3.pdf.

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Thesis (M.S.)--University of Florida, 2000.
Title from first page of PDF file. Document formatted into pages; contains xii, 154 p.; also contains graphics. Vita. Includes bibliographical references (p. 152-153).

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Chan, Patrick Wai-Ho. "A mobile system for distributed multimedia applications." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/10866.

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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1996.
Includes bibliographical references (p. 127-129).
by Patrick Wai-Ho Chan.
M.Eng.

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Wong, Eric M. Eng Massachusetts Institute of Technology. "Optimizations in stream programming for multimedia applications." Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/85522.

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Thesis: M. Eng., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2012.
Cataloged from PDF version of thesis.
Includes bibliographical references (pages 85-89).
Multimedia applications are the most dominant workload in desktop and mobile computing. Such applications regularly process continuous sequences of data and can be naturally represented under the stream programming domain to take take advantage of domain-specific optimizations. Exploiting characteristics specific to multimedia programs can provide further significant impact on performance for this class of programs. This thesis identifies many multimedia applications that maintain induction variable state, which directly inhibits data parallelism for the program. We demonstrates it is essential to recognize and parallelize filters with induction variable state to enable scalable parallelization. We eliminate such state by introducing a new language construct that automatically returns the current iteration number of a target filter. This thesis also exploits the fact that multimedia applications are tolerant in the accuracy of the program output. We apply a memoization technique that exploits this tolerance and the repetitive nature of multimedia data. We provide a runtime system that automatically tunes the memoization capabilities for performance and output quality. These optimizations are implemented in the StreamIt programmming language. The necessity of parallelizing induction variable state and performance improvements and quality control of our memoization technique is demonstrated by a case study of the MPEG benchmark.
by Eric Wong.
M. Eng.

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King, Jonathan R. "New applications of fuzzy logic." Thesis, University of East Anglia, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.365021.

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Birkes, Angela Yvette. "Multimedia data definition and requirements for construction applications." Diss., Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/20930.

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Guerrero, Durhan. "Turbo codes performance and multimedia in mobile applications." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0007/MQ42150.pdf.

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Carrara, Elisabetta. "Security for IP multimedia applications over heterogeneous networks." Licentiate thesis, Stockholm : Dept. of Microelectronics and Information Technology, Royal Institute of Technology, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-514.

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Hamam, Abdelwahab. "Quality of Experience Evaluation for Haptic Multimedia Applications." Thèse, Université d'Ottawa / University of Ottawa, 2013. http://hdl.handle.net/10393/25490.

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Haptic-based Virtual Reality (VR) applications have many merits. What is still obscure, from the designer’s perspective of these applications, is the experience the users will undergo when they use the VR system. Quality of Experience (QoE) is an evaluation metric from the user’s perspective that unfortunately has received limited attention from the research community. Assessing the QoE of VR applications reflects the amount of overall satisfaction and benefits gained from the application in addition to laying the foundation for ideal user-centric design in the future. In this thesis, we address certain issues and concerns regarding QoE of virtual environments. In essence, we propose a taxonomy for the evaluation of the QoE for multimedia applications and in particular VR applications. The taxonomy classifies QoE related parameters into groups. The groups’ organization is generated from the definition we have adopted for the QoE which is the Quality of Service (QoS) plus the user experience (UX). We model this taxonomy using first mathematical modeling based on weighted averages and then a Fuzzy logic Inference System (FIS) to quantitatively measure the QoE of haptic virtual environments. We test both models conducting user study analysis to evaluate the QoE of a VR application. These models serve as engines that facilitate the calculation of QoE with minimal amount of users. We specifically attend to the issue of the new media, haptics, within the context of increasing the QoE of virtual environments (VE). This special attention is important for comparing the effect of tactile and kinesthetic feedback on the QoE. In accordance, we investigate a particular topic that seems to have a colossal effect on QoE throughout our analysis, which is fatigue. Our analysis involved users' studies since the main focus is on the user. The QoE for virtual environments is in its primary stages. This thesis tackles issues that are vital in dealing with and understanding the importance of QoE. The various results suggest a positive user's disposition toward haptics and virtual environments, yet there will always be obstacles and challenges such as fatigue that if minimized will enhance the QoE of haptic-based applications.

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Li, Shumu. "Object-based digital video compression for multimedia applications." Thesis, Heriot-Watt University, 2004. http://hdl.handle.net/10399/325.

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Chandrasekaran, Prashanth. "MULTI-RESOLUTION MULTIMEDIA QOE MODELS FOR IPTV APPLICATIONS." The Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1243613011.

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Venkatachari, Badrinath. "Better admission control and disk scheduling for multimedia applications." Link to electronic thesis, 2002. http://www.wpi.edu/Pubs/ETD/Available/etd-0501102-153840.

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Guenkova-Luy, Teodora. "Coordination of multimedia services and applications in mobile, heterogeneous network environment." [S.l. : s.n.], 2007. http://nbn-resolving.de/urn:nbn:de:bsz:289-vts-58679.

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Khan, Shafqat. "Development of high performance hardware architectures for multimedia applications." Phd thesis, Université Rennes 1, 2010. http://tel.archives-ouvertes.fr/tel-00554668.

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Les besoins en puissance de calcul des processeurs sont en constante augmentation en raison de l'importance croissante des applications multimédia dans la vie courante. Ces applications requièrent de nombreux calculs avec des données de faible précision généralement issues des pixels. Le moyen le plus efficace pour exploiter le parallélisme de données de ces applications est le parallélisme dit de sous-mots (SWP pour \textit{subword parallelism}). Les opérations sont effectuées en parallèle sur des données de faible précision regroupées ce qui permet d'utiliser au mieux les ressources disponibles dimensionnées pour traiter des mots. Dans cette thèse, la conception de différents opérateurs SWP pour les applications multimédia est proposée. Une bonne adéquation entre largeur des sous-mots et largeur des données manipulées permet une meilleure utilisation des ressources et conduit ainsi à améliorer l'efficacité de l'exécution de l'application sur le processeur. Les opérateurs arithmétiques de base développés sont ensuite utilisés dans un opérateur SWP reconfigurable. Ce dernier peut être configuré pour effectuer diverses opérations multimédia avec différentes largeurs de données. L'opérateur reconfigurable peut être utilisé comme unité spécialisée ou comme co-processeur dans un processeur multimédia afin d'en améliorer les performances. La vitesse interne des différentes unités de traitement est également améliorée en représentant les nombres en système redondant plutôt qu'en système binaire. Le système redondant permet entre autre d'augmenter la vitesse des opérations arithmétiques en évitant une propagation de retenue couteuse lors d'opérations d'addition. Les résultats obtenus montrent l'intérêt en terme de performances d'utiliser des opérateurs SWP lors de l'exécution d'applications multimédia.

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Sezer, Osman Gokhan. "Data-driven transform optimization for next generation multimedia applications." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/42765.

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The objective of this thesis is to formulate a generic dictionary learning method with the guiding principle that states: Efficient representations lead to efficient estimations. The fundamental idea behind using transforms or dictionaries for signal representation is to exploit the regularity within data samples such that the redundancy of the representation is minimized subject to a level of fidelity. This observation translates to rate-distortion cost in compression literature, where a transform that has the lowest rate-distortion cost provides a more efficient representation than the others. In our work, rather than using as an analysis tool, the rate-distortion cost is utilized to improve the efficiency of transforms. For this, an iterative optimization method is proposed, which seeks an orthonormal transform that reduces the expected value of rate-distortion cost of an ensemble of data. Due to the generic nature of the new optimization method, one can design a set of orthonormal transforms either in the original signal domain or on the top of a transform-domain representation. To test this claim, several image codecs are designed, which use block-, lapped- and wavelet-transform structures. Significant increases in compression performances are observed compared to original methods. An extension of the proposed optimization method for video coding gave us state-of-the-art compression results with separable transforms. Also using the robust statistics, an explanation to the superiority of new design over other learning-based methods such as Karhunen-Loeve transform is provided. Finally, the new optimization method and the minimization of the "oracle" risk of diagonal estimators in signal estimation is shown to be equal. With the design of new diagonal estimators and the risk-minimization-based adaptation, a new image denoising algorithm is proposed. While these diagonal estimators denoise local image patches, by formulation the optimal fusion of overlapping local denoised estimates, the new denoising algorithm is scaled to operate on large images. In our experiments, the state-of-the-art results for transform-domain denoising are achieved.

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Scherp, Ansgar [Verfasser]. "A component framework for personalized multimedia applications / Ansgar Scherp." Kiel : Universitätsbibliothek Kiel, 2015. http://d-nb.info/1108280064/34.

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Abdul-Hameed, O. "Quality of service for multimedia applications over wireless networks." Thesis, University of Surrey, 2009. http://epubs.surrey.ac.uk/1022/.

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Damoni, Arben. "Multimodal segmentation for data mining applications in multimedia engineering." Thesis, London South Bank University, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.631732.

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This project describes a novel approach to the development of a multimodal video segmentation system for the analysis of multimedia data. The current practices of multimedia data analysis rely either solely on one of the video and audio components or on the presence of both together. The proposed approach makes use of both the video and audio inputs in parallel, complementing each other during the video processing stage, towards optimising both the accuracy and speed of the method. Unlike in the other commonly established methods, the video analysis here is carried out using both the luminance and the chrominance values of the colour images, instead of relying on either of them. The approach considered in the proposed method of video cut detection primarily uses a modified luminance based histogram analysis algorithm, supported by the additional sub-sampling and median filtering options. They improve the efficiency of the method through enhancing its speed and the accuracy of detection respectively. The algorithm mentioned above uses a progressively varying threshold for indicating a significant variation in the measurement of successive histograms for a window length of 2 image frames. The method worked successfully for the videos with varying rates and sizes of the frames that have been under investigation. Because of the degrading effect of chrominance histogram analysis on the processing speed its use is kept to a minimum. This is restricted only to verify the existence of possible cuts, failed to be identified by the luminance analysis. The indication of such cuts could be obtained through audio classification analysis.

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Levis, Steven Michael. "Design of a networked CD-ROM for multimedia applications." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/36568.

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REZENDE, JOSE. "La communication de groupe pour les applications multimedia distribuees." Paris 6, 1997. http://www.theses.fr/1997PA066531.

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Dans un futur proche, nous pouvons nous attendre a ce qu'une partie importante de la bande passante fournie par les reseaux a haute vitesse soit consommee par des applications dites applications multimedia de groupe. Celles-ci devront utiliser des modeles de communication point-a-multipoint voire multipoint-a-multipoint autres que le modele point-a-point traditionnel. Il s'avere alors necessaire de reviser a la fois le service, les protocoles et les mecanismes indispensables pour le support de telles applications. La communication de groupe pose des problemes nouveaux de controle d'erreur, de flux ou de congestion, mais egalement des contraintes de qualite de service, telles que de fiabilite ou de delai. La maitrise de ces elements est extremement complexe, en raison du nombre et de la variete des participants ainsi que de la nature et des proprietes des reseaux utilises. La contribution de cette these reside dans l'etude, la conception, l'analyse et la realisation d'un service multicast fiable. La premiere etape a consiste a specifier une architecture de service originale reposant sur une separation en deux plans, representant le caractere multimedia d'une part, et multiparticipants, d'autre part. La seconde etape a permis de specifier le service multicast appele m-connection service qui a conduit a la conception de deux algorithmes pour le controle de la fiabilite. En particulier, des mecanismes de controle d'erreur, de flux ou d'integrite sont developpes. Ils sont l'objet d'une analyse par simulation afin d'evaluer leur performance et d'etudier leur sensibilite a differents parametres de fonctionnement. Finalement, ces algorithmes ont ete implementes afin de les exploiter par la suite dans une plateforme d'experimentation atm et ip / atm. Des mesures ont ete egalement ete effectuees sur le mbone en raison de sa disponibilite. L'ensemble a permis de valider les choix proposes et de disposer d'une maquette operationnelle.

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Moore, Billy R. "Evaluating and Blending Multimedia Mobile Applications into Technical Training." Thesis, University of North Texas, 2011. https://digital.library.unt.edu/ark:/67531/metadc68019/.

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This study in the aerospace ground equipment (AGE) apprentice course at Sheppard Air Force Base, Texas, examined the use of mobile digital devices to determine which device leveraged the best results and was most compatible with military technical training requirements. The sample consisted of 160 students who attended the course between January and June, 2010. Three devices loaded with course materials were issued to the students, who used the devices in the classroom and were encouraged to use the devices to enhance their study time after class. Quantitative data were obtained by comparing block test scores to determine if any device produced a significant change in student learning. Qualitative data were collected from surveys administered to instructors and students to measure which device instructors and students found easiest to understand and use, and student satisfaction with the device. An analysis of variance (ANOVA) revealed a statistically significant difference (p < .05) in the block test mean scores between groups using mobile devices and the students in the control group that had no device. Post hoc comparisons on each block showed that there was a statistically significant difference between students using the smartphone and students using the other devices, but no statistically significant difference in the block test mean scores between students using the iPod and the netbook. The netbook leveraged the best results, both in block test scores and student satisfaction. The greatest reported disadvantage of the smartphone and the iPod Touch was the small screen size.

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Fitzpatrick, Tom. "Open component-oriented multimedia middleware for adaptive distributed applications." Thesis, Lancaster University, 2000. http://eprints.lancs.ac.uk/11797/.

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Hine, Nicolas A. "Towards a multimedia communication service for people with disabilities." Thesis, University of Dundee, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.271377.

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Fough, Nazila. "Design and analysis of RTP circuit breaker for multimedia applications." Thesis, University of Aberdeen, 2015. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=228630.

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Live network multimedia applications (e.g., video conferencing, TV on demand) have been very popular in recent years and are expected to dominate Internet traffic in the near future. With multimedia and Internet-enabled devices being ubiquitous, mechanisms that ensure multimedia flows do not congest the Internet are crucial components of multimedia systems that are embraced rather than opposed by network service providers. The emergence of browser-based multimedia conferencing applications using the WebRTC protocol, an open source project aiming at Real-Time Communication (RTC) with Web, and wide deployment of these applications are expected to increase the traffic of interactive real-time multimedia on the Internet. RTP Media Congestion Avoidance Technique (RMCAT) may be applied to WebRTC, but this is a long-term process and WebRTC deployments will occur before RMCAT is completed. New methods and quick solutions are therefore required to protect the network from uncontrolled media flows until deployment of effective congestion control can be guaranteed. The RTP Protocol Circuit Breaker (RTP-CB) has been proposed in March 2012 within the Internet Engineering Task Force (IETF). Rather than providing congestion control, the RTP-CB is designed only to protect the network by terminating RTP/UDP flows that cause excessive congestion. While the deployment of congestion control for RTP/UDP flow remains an open issue, design a RTP-CB as a quick solution for protecting the current internet is the main focus of this work. In this work by analysing the UDP traffic over a limited path, a RTP-CB algorithm is designed. Then a packet sniffer's code (C routine) is written to sniff and analyse all RTP/UDP, TCP, RTCP SR, and RTCP RR traffic. Based on the designed algorithm the above code was developed further to work as a RTP-CB. This RTP-CB can be deployed on receiver or sender. After deployment of RTP-CB for RTP/UDP flows in a controlled network, its performance in a range of scenarios with using only its congestion rule has been evaluated. The evaluation showed some short coming in performance of RTP-CB in some certain condition when RTP-CB used only congestion rule. The performance of the RTP-CB is evaluated from two perspectives: First, the thesis considered network performance metrics, such as the frequency at which a RTP circuit breaker triggered. Then, it considered the experience of multimedia users, accounting for all outcomes to all users: those congesting the network (where the flow is terminated), those that did not (and are rewarded by reduced congestion) as well as flows that, without severely congesting the network, obtained little quality from a multimedia session and consumed network resources to no avail. Building on the knowledge gathered in these experiments, some extensions (Media Usability Rule) to the RTP-CB rules is proposed and evaluated. This work demonstrates this evaluation by streaming video flows over IP networks using a dedicated test-bed and proposed RTP-CB. These experiments assess the effect of network conditions (packet loss, jitter and network capacity constraint) on the transmission of different types of video stream with and without the proposed RTP-CB Media usability rule. The experiments prove that RTP-CB implementing the congestion rule alone can offer adequate protection to a network, but it does not perform well in some conditions, for example, when the bottleneck buffer size is small. Experiments confirm that the proposed (computationally inexpensive) modifications to the RTP-CB rules improve the RTP-CB performance. The results of these experiments and media usability rule were introduced in IETF RTP-CB draft version 07 of October 27, 2014 and later versions acknowledged contributions by the author of this thesis.

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Witosurapot, Suntorn, and wsuntorn@fivedots coe psu ac th. "Resolving competition for resources between multimedia and traditional Internet applications." Swinburne University of Technology, 2004. http://adt.lib.swin.edu.au./public/adt-VSWT20050309.123048.

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Although the Internet is the dominant broadband network, it still has a fundamental shortcoming in traffic management that does not properly support efficient use of resources together with differentiated quality of service for mixed traffic types. Even though a number of mechanisms have been proposed under key approaches of resource adaptation, resource reservation, and resource pricing, this problem remains unsolved to date because of its complexity and the way it relates to so many considerations of engineering and economics, and the diverse range of services desired by users. Hence it is considered difficult to devise a perfect mechanism that can universally solve this problem. In this respect, this dissertation contributes to insights into potential combinations and trade-offs of key approaches above in some efficient manner for managing traffic and scarce resources in the Internet. The first part of this work considers the combination of relaxed resource reservation and resource pricing schemes for handling the unfair bandwidth distribution problem in soft-bandwidth guarantee services of the Differentiated Services (DiffServ) Internet. We show that this unfairness problem can be handled using a network-user cooperative approach that addresses both individual user satisfaction and global optimization. We propose to add a mechanism based on price-based feedback signaling to DiffServ-capable routers providing Assured Forwarding (AF) Service so that they can offer per-flow signaling. This still allows them to work at an aggregate traffic level, hence the scalability feature of the DiffServ network can be retained. Our proposed mechanism allows the network to offer reliable service assurances via a distributed optimization algorithm, without introducing special protocols or requiring routers to have access of individual user requirements. Moreover, it can provide incentives for users to cooperate so that optimum performance can be accomplished. This approach has broad applicability and is relevant to all types of assured service classes. The second part of this work considers the combination of a specific resource pricing scheme based on a distributed optimization algorithm and multimedia adaptation schemes. Such a capability has not been available because most utility functions of multimedia applications do not meet the concavity constraints required by optimization algorithm. We proposed to overcome this limitation by redefining user utility functions into equivalent discrete forms and using combinatorial (discrete) optimization so that interfacing the resource-pricing scheme can be done in a normal way. However, to obtain feasible solutions in a scalable manner, an agent is included into the scheme for solving the combinatorial (discrete) optimization on behalf of a small group of users. In return, all users belonging to this group can benefit from social welfare maximization of their utilities over a network resource constraint. The last part of this work considers the combination of relaxed resource reservation and resource pricing schemes to enable a proper charging scheme for adaptive applications in the DiffServ Internet. We provide an optimization formulation of the problems of revenue and social welfare maximization, applied at a service provider (SP) who gives access to the DiffServ Internet. In this scheme, resources are provisioned per QoS-oriented class in a long time scale (service level agreement (SLA) duration), then priced based on user demand in the short time scale. We also show that the proposed charging scheme can provide feedback and incentives for users to use the network resource optimally via the standard packet marking, hence eliminating the need for specific pricing protocol. All of the proposals in this work can be used together, solving these key problems as a coordinated whole, and all use readily available network mechanisms.

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Fatemi, Omid. "Fractal engine, an affine video processor core for multimedia applications." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0016/NQ57040.pdf.

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Damier, Christophe Adiba Michel Delobel Claude Chiaramella Yves Mossière Jacques. "OMEGA un SGBD multimedia oriente objet pour les applications geographiques /." S.l. : Université Grenoble 1, 2008. http://tel.archives-ouvertes.fr/tel-00333131.

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Duarte, Bruno Miguel Silva. "Personal unified multimedia applications." Master's thesis, 2007. http://hdl.handle.net/10451/4697.

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Trabalho de projecto de mestrado em Engenharia Informática, apresentado à Universidade de Lisboa, através da Faculdade de Ciências, 2007
Este documento descreve o projecto realizado no âmbito da disciplina de Projecto em Engenharia Informática do segundo ano do curso Mestrado em Engenharia Informática da Faculdade de Ciências da Universidade de Lisboa. O projecto é desenvolvido no Pólo de Lisboa da Portugal Telecom Inovação. Esta instituição tem como objectivo ser líder nas áreas de conhecimento estratégicas para o desenvolvimento dos negócios em que o Grupo Portugal Telecom está presente. O trabalho de investigação e desenvolvimento é enquadrado no projecto IP-JIB, uma plataforma para fornecimento de serviços inteligentes na rede de telecomunicações de próxima geração do Grupo Portugal Telecom. Em concreto, o trabalho consistiu no estudo e concepção de um serviço que permita ao utilizador controlar o comportamento de todas as suas telecomunicações, dependente do contexto em que este se encontra. Relata-se o estudo que existiu no campo das redes de próxima geração e na concepção ou adaptação de um motor de regras que representasse a lógica de decisão de serviço. Neste âmbito, pretende-se esclarecer o leitor sobre a necessidade e a forma de concepção deste sistema normalmente associado à Inteligência Artifcial.
This document describes the project developed in the course Projecto em Engenharia Inform ática (Informatic Engineering Project) that took place in the second year of the course Mestrado em Engenharia Informática (Informatic Engineering Masters) of the University of Lisbon Faculty of Science. The project took place at the Lisbon Pole of Portugal Telecom Inovação. The main goal of this company is to be leader in strategic research areas to develop the core business of the Portugal Telecom Group. This research and development work is related to the project IP-JIB, a platform to deploy intelligent services in the Next Generation Networks Portugal Telecom's solution. The main goal of the work was to study and develop a service that allowed the end user to manage the behavior of all his communications, in according with his context. This document describes the study in the Next Generation Networks and the adaption or development of a Rules Engine to control a service business logic.

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Wang, Chang-Ben, and 汪張本. "Multicast Routing for Multimedia Applications." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/01901882895583220900.

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碩士
國立中正大學
資訊工程研究所
88
[ABSTRACT] The exploding Internet has arisen many novel network applications. These applications include video on demand (VOD), video/audio phone, distance learning, interactive games, and so on. There are two major characteristics of these applications. One of the characteristics is group communicating with other hosts is required. The other one is requirement of more network bandwidth and quality of service guarantee for real-time multimedia applications. Thus, the underlying routing protocols must provide an efficient scheme for more effective and efficient data transmission. In practical, emerging multicast schemes such as Core-Based Tree (CBT) and Distance Vector Multicast Routing Protocol (DVMRP) support group communication service. In this thesis, we study many performance issues of routing multimedia applications using existing Internet multicast routing protocols. Our numerical results show that the routing performance can be improved by careful core placement, appropriate link cost function, and multiple multicast trees routing.

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Lee, Chang-Yu, and 李昌祐. "Multimedia Applications over Satellite Communications." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/54577574329595421097.

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碩士
國立高雄應用科技大學
電子與資訊工程研究所碩士班
93
Satellite communication has many advantages over any other communication network whenever the information is targeted to a large population of receiver or when they are spread over large areas. This makes satellite communications to be especially suitable for the provision of multimedia applications in remote areas that would be very expensive to reach with terrestrial cables or even terrestrial radio links. In this thesis, we propose the architecture of broadband satellite multimedia services (e.g., interactive videoconferencing, remote learning, enterprise distance training, video on demand services, multimedia applications) based on the technologies, such as DVB-IP, unicast, multicast, media streaming, etc. This system, combines broadband satellite networks and terrestrial communication networks, is effectively employed to meet the demands of one point to multipoint communications. Users can get desired various services by using the broadband satellite multimedia system.

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"Optimizing VLIW architectures for multimedia applications." Universitat Politècnica de Catalunya, 2007. http://www.tesisenxarxa.net/TDX-0416108-105629/.

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Bi-Hao, Zhuang. "Branch Behavior Characterization for Multimedia Applications." 2005. http://www.cetd.com.tw/ec/thesisdetail.aspx?etdun=U0001-2807200515195100.

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Ko, Li-Chun, and 柯力群. "Hardware-Software Partitioning in Multimedia Applications." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/32324040079809391051.

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碩士
國立臺灣大學
電機工程學研究所
90
Multimedia application is one of major products in the consumer electronic market. Because of the fast change on variety and short time-to-market requirement, a multimedia application should be commercialized as soon as possible to obtain maximum profit. But at the same time, minimizing design cost is another important thing, so how to implement a design efficiently plays an important role in determining the success of one product. It can be divided into two different portions when implementing a multimedia system, that is, software portion and hardware portion. Due to the higher cost in developing hardware, the designer would usually prefer to implement a system mostly by a software-solution. Only the functions that have a higher performance requirement or a tight timing constraint would be implemented as hardware. In this Thesis, we propose a system/ function level hardware/software partitioning methodology to perform system partitioning of multimedia applications, and we also use JPEG2000 coding system as an example to demonstrate how to perform design space exploration by using our methodology to obtain an optimal system partitioning that can satisfy user defined design constraints. Our partitioning methodology could not only be used in traditional hardware/software codesign flow, but also can be used under the integrated platform-based function-architecture codesign.

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Zhuang, Bi-Hao, and 莊弼皓. "Branch Behavior Characterization for Multimedia Applications." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/15134119961506339497.

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碩士
國立臺灣大學
資訊工程學研究所
93
Modern embedded processors, like Intel''s XScale, employ dynamic branch prediction to reduce performance penalty caused by branch instructions. Existing branch predictor de- signs are all based on the behavior of applications on a GPP (general purpose processor), such as gcc and gzip. However, for an embedded system, such as smart phone, multimedia and communication applications are two main workloads. I found that a commonly used bimodal branch predictor actually has lower branch prediction accuracy for multimedia/communication workloads than workloads for GPP. In this thesis, I perform detailed analysis on the branch behavior of multimedia/communication applications. I found that the iteration counts of loop branches in these applications are very regular, and most of them are counted loops. I also found that many mispredictions of if-branches occur on sequential comparisons of array elements. Finally, many of the values of control variables in if-branches have the property of data predictability. The findings of this work are important for branch predictor design for embedded processors.

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Dissertations / Theses on the topic 'Multimedia applications'

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