Title: A Three Layer System for Audio-visual Quality Assessment

The development of models for quality prediction of both audio and video signals is a fairly mature field. But, although several multimodal models have been proposed, the area of audiovisual quality prediction is still an emerging area. In fact, despite the reasonable performance obtained by combination and parametric metrics, currently … Read more

Title: Quality of experience characterization and provisioning in mobile cellular networks

  Traditionally, previous generations of mobile cellular networks have been designed with Quality of Service (QoS) criteria in mind, so that they manage to meet specific service requirements. Quality of Experience (QoE) has, however, recently emerged as a concept, disrupting the design of future network generations by giving clear emphasis … Read more

Title: Quality of Experience and Access Network Traffic Management of HTTP Adaptive Video Streaming

The thesis focuses on Quality of Experience (QoE) of HTTP adaptive video streaming (HAS) and traffic management in access networks to improve the QoE of HAS. First, the QoE impact of adaptation parameters and time on layer was investigated with subjective crowdsourcing studies. The results were used to compute a … Read more

Title: Objects for spatio-temporal activity recognition in videos

This thesis investigates the role of objects for the spatio-temporal recognition of activities in videos. We investigate what, when, and where specific activities occur in visual content by examining object representations, centered around the main question: what do objects tell about the extent of activities in visual space and time? … Read more

Title: An action recognition framework for uncontrolled video capture based on a spatio-temporal video graph

The task of automatic categorization and localization of human action in video sequences is valuable for a variety of applications such as detecting relevant activities in surveillance video, summarizing and indexing video sequences or organizing a digital video library according to the relevant actions. However it remains a challenging problem … Read more

Title: Deep image representations for instance search

We address the problem of visual instance search, which consists to retrieve all the images within an dataset that contain a particular visual example provided to the system. The traditional approach of processing the image content for this task relied on extracting local low-level information within images that was “manually … Read more

Title: Improving instance search performance in video collections

This thesis presents methods to improve instance search and enhance user performance while browsing unstructured video collections. Through the use of computer vision and information retrieval techniques, we propose novel solutions to analyse visual content and build a search algorithm to address the challenges of visual instance search, while considering … Read more

Title: An Investigation Into Machine Learning Solutions Involving Time Series Across Different Problem Domains

In this thesis we will examine architectures and models for machine learning in three problem domains each of which are based around the use of time series data in time series applications. We set out to examine whether the architecture and model solutions in different problem domains will converge when … Read more

Title: Behavioural biometric identification based on human computer interaction

As we become increasingly dependent on information systems, personal identification and profiling systems have received an increasing interest, either for reasons of personalisation or security. Biometric profiling is one means of identification which can be achieved by analysing something the user is or does (e.g., a fingerprint, signature, face, voice). … Read more

Title: Investigating multi-modal features for continuous affect recognition using visual sensing

Emotion plays an essential role in human cognition, perception and rational decisionmaking. In the information age, people spend more time then ever before interacting with computers, however current technologies such as Artificial Intelligence (AI) and Human-Computer Interaction (HCI) have largely ignored the implicit information of a user’s emotional state leading … Read more

Sang-hyo Park

In video coding, motion estimation (ME) that predicts a block among temporally correlated frames has had a crucial impact on not only the compression efficiency, but also the computational complexity. Particularly, fast ME algorithms has been a pivot in much research that attempts to reduce the complexity of video encoder … Read more

Shrinivas D Desai

Medical imaging has advanced tremendously over the decade right from the inception. Among many, X-ray Computed Tomography+ (CT) is recognized as an imperative medical imaging modality to reveal the interior details of human body for effective diagnosis, treatment, operation and complication management of various clinical cases. CT operates on the principle of reconstruction of … Read more

Sucheta Ghosh

Parsing discourse is a challenging natural language processing task. In this research work first we take a data driven approach to identify arguments of explicit discourse connectives. In contrast to previous work we do not make any assumptions on the span of arguments and consider parsing as a token-level sequence … Read more

Rufael Mekuria

The Internet is used for distributed shared experiences such as video conferencing, voice calls (possibly in a group), chatting, photo sharing, online gaming and virtual reality. These technologies are changing our daily lives and the way we interact with each other. The current rapid advances in 3D depth sensing and … Read more

Svetlana Kordumova

This thesis contributes to learning machines what is in an image by avoiding direct manual annotation as training data. We either rely on tagged data from social media platforms to recognize concepts, or on objects semantics and layout to recognize scenes. We focus our effort on image search.We firstly demonstrate … Read more

Amirhossein Habibian

This thesis studies the fundamental question: what vocabulary of concepts are suited for machines to describe video content? The answer to this question involves two annotation steps: First, to specify a list of concepts by which videos are described. Second, to label a set of videos per concept as its … Read more

Masoud Mazloom

In this thesis we aim to represent an event in a video using semantic features. We start from a bank of concept detectors for representing events in video. At first we considered the relevance of concepts to the event inside the video representation. We address the problem of video event … Read more

Chien-nan Chen

3D Tele-immersion (3DTI) technology allows full-body, multimodal interaction among geographically dispersed users, which opens a variety of possibilities in cyber collaborative applications such as art performance, exergaming, and physical rehabilitation. However, with its great potential, the resource and quality demands of 3DTI rise inevitably, especially when some advanced applications target … Read more

Pengpeng Ni

Modern video coding techniques provide multidimensional adaptation options for adaptive video streaming over networks. For instance, a video server can adjust the frame-rate, frame-size or signal-to-noise ratio (SNR) of the video being requested to cope with the available bandwidth. However, these adaptation operations give rise to distinct visual artefacts, so … Read more

Hamed Ahmadi

Fulfilling cloud gaming’s (CG) ultimate goal; i.e., playing video games wherever, whenever and on every devices, requires reduction of its high bandwidth demand in a way that doesn’t adversely affect the players’ quality of experience. One way to do so is to reduce the bitrate of the regions in the … Read more

Britta Meixner

Modern Web technology makes the dream of fully interactive and enriched video come true. Nowadays it is possible to organize videos in a non-linear way playing in a sequence unknown in advance. Furthermore, additional information can be added to the video, ranging from short descriptions to animated images and further … Read more

Honglin Yu

Understanding the popularity evolution of online media has become an important research topic. There are a number of key questions which have high scientific significance and wide practical relevance. In particular, what are the statistical characteristics of online user behaviors? What are the main factors that affect online collective attention? … Read more

Sambit Bakshi

The advent of biometric system as a next-generation solution towards bringing social and national security to a technically-achievable scenario. This paradigm of authentication has easily taken over the classical token-based and knowledge-based systems. The last decade has seen researches claiming face and iris to be the most promising two traits. … Read more

Rodrigo Laiola Guimarães

Creating compelling multimedia productions is a non-trivial problem. This is true for both professional and personal content. For professional content, extensive production support is typically available during creation. Content assets are well structured, content fragments are professionally produced with high quality, and production assets are often highly annotated (within the … Read more

Mario Montagud Climent

Nowadays, we are witnessing a transition from physical togetherness towards networked togetherness around media content. Novel forms of shared media experiences are gaining momentum, allowing geographically distributed users to concurrently consume the same media content while socially interacting (e.g., via text, audio or video chat). Relevant use cases are, for … Read more

Hoda Roodaki

With the growing demand for 3D video, efforts are underway to incorporate it in the next generation of broadcast and streaming applications and standards. Scalability is one possible solution to reduce the amount of data in multi-view/3D video in heterogeneous environments. But using Scalable Multi-view Video Coding (SMVC) for multi-view/3D … Read more

Abbas Javadtalab

Video streaming applications over best-effort networks, such as the Internet, have become very popular among Internet users. Watching live sports and news, renting movies, watching clips online, making video calls, and participating in videoconferences are typical video applications that millions of people use daily. One of the most challenging aspects … Read more

Ying Zhang

In recent years, we have witnessed an overwhelming number of user-generated videos being captured on a daily basis. An essential reason is the rapid development in camera technology and hence videos are easily recorded on multiple portable devices, especially mobile smartphones. Such flexibility encourages the modern videos to be tagged … Read more

Jason J Quinlan

Recent years have witnessed a rapid growth in the demand for streaming video over the Internet, exposing challenges in coping with heterogeneous device capabilities and varying network throughput. When we couple this rise in streaming with the growing number of portable devices (smart phones, tablets, laptops) we see an ever-increasing … Read more

Lilian Calvet

The thesis deals with the problem of 3D reconstruction of a rigid scene from a collection of views acquired by a digital camera. The problem addressed, referred as the Structure-from-Motion (SfM) problem, consists in computing the camera motion (including its trajectory) and the 3D characteristics of the scene based on … Read more

Dakshina Ranjan Kisku

Human physiological or behavioral characteristics are available uniquely to each individual as biometrics evidence and the biometrics system can be able to verify or identify a person correctly. Reliable person recognition is an important problem in diverse fields. Biometrics recognition based on distinctive personal traits, has the potential to become … Read more

Chidansh Amitkumar Bhatt

Advances in data acquisition and storage technology have led to the growth of very large multimedia databases. Analyzing this huge amount of multimedia data to discover useful knowledge is a challenging problem. This challenge has opened the opportunity for research in Multimedia Data Mining (MDM), the process of finding interesting … Read more

Håvard Espeland

Working with modern architectures for high performance applications is increasingly more diffi- cult for programmers as the complexity of both the system architectures and software continue to increase. The level of hand tuning and native adaptations required to achieve high performance comes at the cost of limiting the portability of … Read more

Jia Hao

The astounding volume of camera sensors produced for and embedded in cellular phones has led to a rapid advancement in their quality, wide availability and popularity for capturing, uploading and sharing of videos (also referred to user-generated content or UGC). Furthermore, GPS-enabled smartphones have become an essential contributor to location-based … Read more

Johannes Konert

Social Media, as an information and communication technology, enables users to exchange information about experiences and insights in easy ways. Such exchange can be used for peer interaction among players of educational computer games as well. The players profit from social media content as learning resources are created, edited, and … Read more

Afsaneh Asaei

This thesis takes place in the context of multi-microphone distant speech recognition in multiparty meetings. It addresses the fundamental problem of overlapping speech recognition in reverberant rooms. Motivated from the excellent human hearing performance on such problem, possibly resulting of sparsity of the auditory representation, our work aims at exploiting … Read more

Mehdi Semsarzadeh

With recent advances in computing and communication technologies, ubiquitous access to high quality multimedia content is a fact of our daily life. However, resource consumption is still a major concern, specially battery consumptions for mobile devices. Today, any user is able to produce and consume multimedia contents using a smartphone … Read more

Emanuele Carlini

This dissertation investigates the combination of Peer-to-Peer (P2P) and Cloud Computing to support Massively Multiplayer Online Games (MMOGs). MMOGs are large-scale distributed applications allowing for a large amount of users worldwide to share a real-time virtual environment. Today’s commercial architectures for MMOG are over-sized to support peak loads, therefore expensive … Read more

Ulrich Lampe

Since the early days of computing, a vision has been to provide Information Technology services in the form of a utility, just like water, electricity, or telephony. With the advancement of the cloud computing paradigm since the mid-2000s, this vision has been put into realization. Cloud computing builds on and … Read more

Florian Mehm

Digital Educational Games, as one of the most important application areas of Serious Games, combine positive properties of digital games, such as strong motivation for players and inherent learning processes, with educational methods and technologies. Adaptive algorithms allow such games to be aligned automatically to the needs of different players, … Read more

Tomas Kupka

Video streaming has gone a long way from its early years in the 90’s. Today, the prevailing technique to stream live and video on demand (VoD) content is adaptive HTTP segment streaming as used by the solutions from for example Apple, Microsoft, and Adobe. The reasons are its simple deployment … Read more

Tiia Ojanperä

The volume of data transmitted across wireless and mobile networks continues to grow at a rapid rate. Videos already account for most of this data traffic, and their share is expected to grow even bigger in the near future. The thesis presents a novel video service architecture designed to optimise … Read more

Johannes Schels

This thesis presents part-based approaches to object class detection in single 2D images, relying on pre-built CAD models as a source of synthetic training data. Part-based models, representing an object class as a deformable constellation of object parts, have demonstrated state-of-the-art results with respect to object class detection. Typically, the … Read more

Zhijie Shen

In recent years, people have become accustomed to sharing and watching videos on the Internet. Particularly, the rapid advance in the technology of mobile devices has attracted users to produce and consume videos on the newly booming platform. With the technological innovation, a new life cycle of a video has … Read more

John Gilmore

Recently, there has been significant research focus on Peer-to-Peer (P2P) Massively Multi-user Virtual Environments (MMVEs). A number of architectures have been presented in the literature to implement the P2P approach. One aspect that has not received sufficient attention in these architectures is state management and state persistency in P2P MMVEs. … Read more

Paul B. Beskow

The computational demands of interactive multimedia applications are steadily increasing as consumers call for progressively more complex and intelligent multimedia services. New multi-core hardware architectures provide the required resources, but writing parallel, distributed applications remains a labor-intensive task compared to their sequential counter-part. For this reason a number of parallel … Read more

Dominik Strohmeier

To meet the requirements of consumers and to provide them with a greater quality of experience than existing systems do is a key issue for the success of modern multimedia systems. However, the question about an optimized quality of experience becomes more and more complex as technological systems are evolving … Read more

Stefan Wieser

This thesis investigates flexible self-organizing overlay networks for multimedia delivery – networks that are dynamically built on existing infrastructure to support the preferences of applications using them. For example, consider a large sports event with several concurrent competitions, in which hundreds of thousands visitors produce and consume videos with their … Read more

Zixia Huang

This dissertation investigates issues of performing synchronized distribution of time-correlated multi-modal continuous media data in the distributed interactive teleimmersion, and proposes approaches to solve these problems. The current best-effort shared Internet is unreliable in supporting bandwidth-savvy multimedia streaming, and frequent network jitter can contribute to the heterogeneity of distribution latencies … Read more

Mukesh Saini

Video surveillance is a very effective means of monitoring activities over a large area with cameras as extended eyes. However, this additional security comes at the cost of privacy loss of the citizens not involved in any illicit activities. Because an adversary can use prior knowledge to infer the identities … Read more

Robert Kuschnig

Internet video streaming is a hot topic in multimedia systems. This thesis introduces a new approach to video streaming based on multiple request-response streams. The novelty of this system is that it is able to make use of multiple HTTP-based request-response streams while still providing TCP-friendliness. The results indicate that … Read more

Kristian Evensen

One the few constants in the world of computer networking, is that users always want more bandwidth. The usage of bandwidth-intensive services, like video streaming, video conferencing and games, have exploded over the last couple of years. At the same time, devices capable of connecting to two or more different … Read more

Apostolos Papageorgiou

At the crossroads of two hot trends of modern computer science, namely service-orientation and mobile computing, great potentials arise together with tough challenges. The list of advantages of combining these technologies is long and compelling: Outsourcing of data- and processing-intensive software tasks from mobile devices to more capable systems, quick … Read more

Anita Sobe

In this thesis the non-sequential delivery of media in dynamic networks is investigated. Consider a scenario where people participate at a social event. With the increased popularity of smart phones and tablet computers people produce more and more multimedia content. They share their content and consume it on popular web … Read more

Dominik Kaspar

The explosive deployment of wired and wireless communication infrastructure has recently enabled many novel applications and sparked new research problems. One of the unsolved issues in today’s Internet – the main topic of this thesis – is the goal of increasing data transfer speeds of end hosts by aggregating and … Read more

Mohammad Kazemi Varnamkhasti

Multiple distortion coding (MDC) is a promising solution for video transmission over lossy channels. In MDC, multiple descriptions of a source are generated which are dependently decodable and mutually refinable. When all descriptions are available, the corresponding quality is called central quality; otherwise it is called side quality. Generally, there … Read more

Sree Hari Krishnan Parthasarathi

The work described in this thesis takes place in the context of capturing real-life audio for the analysis of spontaneous social interactions. Towards this goal, we wish to capture conversational and ambient sounds using portable audio recorders. Analysis of conversations can then proceed by modeling the speaker turns and durations … Read more

Mona Omidyeganeh

Video modeling and analysis have been of great interest in the video research community, due to their essential contribution to systematic improvements concerned in a wide range of video processing techniques. Parametric modeling and analysis of video provides appropriate means for processing the signal and the necessary mining of information … Read more

Xirong Li

In a world with increasing amounts of digital pictures, content-based visual search is an important and scientifically challenging problem in ICT research. This thesis tackles the problem by learning from social media. The fundamental question addressed in this thesis is: what is the value of socially tagged images for visual … Read more

Andreas Reinhardt

Wireless sensor and actuator networks are comprised of embedded systems with sensing, actuation, computation, and wireless communication capabilities. Their untethered character provides installation flexibility and has in consequence led to their application in a large range of domains, e.g. environmental and habitat monitoring, or industrial process surveillance and control. Besides … Read more

Manfred del Fabro

This thesis discusses three major issues that arise in the context of non-sequential usage of multimedia content, i.e. a usage, where users only access content that is interesting for them. These issues are (1) semantically meaningful segmentation of videos, (2) composition of new video streams with content from different sources … Read more

Mu Mu

IP-based packet-switched networks have become one of the main content distribution platforms for emerging multimedia services such as IPTV, thanks to the rapidly growing bandwidth and exclusive inter-networking and interactivity features of IP-based networks. Meanwhile, high quality video content services are becoming particularly popular within content delivery networks (CDN). During … Read more

Doreen Böhnstedt

The knowledge explosion, changing circumstances due to new forms of work and many technical developments determine that the knowledge acquired in education is not sufficient throughout life. Therefore, self-directed learning in the workplace is becoming increasingly important. This is a form of learning where a current information need is met … Read more

Jun Wang

Unlike textual document retrieval, searching of visual data is still far from satisfactory. There exist major gaps between the available solutions and practical needs in both accuracy and computational cost. This thesis aims at the development of robust and scalable solutions for visual search and retrieval. Specifically, we investigate two … Read more

Philipp Scholl

In the knowledge-based society, the maintenance and acquisition of new knowledge are vital for each individual. Changed living and working conditions and the rapid development of technology cause the half-life of knowledge to decrease. Therefore, the knowledge that is acquired in educational institutions is no longer sufficient for an entire … Read more

Wanmin Wu

3D tele-immersion (3DTI) has the potential of enabling virtual-reality-like interaction among remote people with real-time 3D video. However, today’s 3DTI systems still suffer from various performance issues, limiting their broader deployment, due to the enormous demand on temporal (computing) and spatial (networking) resources. Past research focused on system-centric approaches for … Read more

Dinesh Babu Jayagopi

The computational modeling of face-to-face interactions using nonverbal behavioral cues is an emerging and relevant problem in social computing. Studying face-to-face interactions in small groups helps in understanding the basic processes of individual and group behavior; and improving team productivity and satisfaction in the modern workplace. Apart from the verbal … Read more

Radu Andrei Negoescu

The amount of multimedia content is on a constant increase, and people interact with each other and with content on a daily basis through social media systems. The goal of this thesis was to model and understand emerging online communities that revolve around multimedia content, more specifically photos, by using … Read more

Pinaki Sinha

Photo taking and sharing devices (e.g., smart phones, digital cameras, etc) have become extremely popular in recent times. Photo enthusiasts today capture moments of their personal lives using these devices. This has resulted in huge collections of photos stored in various personal archives. The exponential growth of online social networks … Read more

Kimiaki Shirahama

Due to the rapidly increasing video data on the Web, much research effort has been devoted to develop video retrieval methods which can efficiently retrieve videos of interest. Considering the limited man-power, it is much expected to develop retrieval methods which use features automatically extracted from videos. However, since features … Read more

Katayoun Farrahi

As we live our daily lives, our surroundings know about it. Our surroundings consist of people, but also our electronic devices. Our mobile phones, for example, continuously sense our movements and interactions. This socio-geographic data could be continuously captured by hundreds of millions of people around the world and promises … Read more

Vineeth N Balasubramanian

The field of multimedia pattern recognition is on a fundamental quest to design intelligent systems that can learn and behave the way humans do. One important aspect of human intelligence that has so far not been given sufficient attention in these fields is the capability of humans to hedge decisions. … Read more

Peter Knees

The aim of this PhD thesis is to develop automatic methods that extract textual descriptions from the Web that can be associated with music pieces. Deriving descriptors for music permits to index large repositories with a diverse set of labels and allows for retrieving pieces and browsing collections. The techniques … Read more

Lin Lin

With the explosion in the complexity and amount of pervasive multimedia data, there are high demands of multimedia services and applications in various areas for people to easily access and distribute multimedia data. Facing with abundance multimedia resources but inefficient and rather old-fashioned keyword-based information retrieval approaches, a content-based multimedia … Read more

Beatriz Soret

Providing Quality of Service (QoS) guarantees is an important challenge in the design of next generations of wireless networks. In particular, real-time services involving stringent delay constraints are expected to be increasingly popular among users of mobile equipments. In Rayleigh channels, the delay requirement is usually expressed in terms of … Read more

Andre Miede

Challenging market dynamics and the rise of complex value networks require organizations to adjust their processes rapidly in order to stay competitive. Because many organizational processes are directly supported or even enabled by Information Technology (IT), a process is only as flexible as its underlying technological representation. The Service-oriented Architecture … Read more

Razib Iqbal

Today access to video is available via numerous multimedia enabled devices through a wide variety of network types. What is required is a mechanism to ensure that users can receive different qualities of video proportional to their device capabilities and network conditions. In this thesis, we propose an online adaptive … Read more

Kalman Graffi

The peer-to-peer paradigm has had large success in content distribution and multimedia communication applications on the Internet. In a peer-to-peer network, the participating nodes create an infrastructure to provide a desired functionality and offer their resources to host an application in a distributed manner. Besides the functional requirements of an … Read more

Jia Li

With the rapid development of Internet, the amounts of images and videos are now growing explosively, leading to many new challenges on image/video processing. On one hand, the processing capability of computer is limited and the computational resource should be allocated to the important visual information with high priorities. On … Read more

Ingo Kofler

This thesis investigates mechanisms and applications for in-network adaptation of scalable video bit streams based on the recent H.264/Scalable Video Coding (SVC) standard. In-network adaptation refers to the adaptation of a video stream by a network element during the stream’s transport through the network. The advantages of performing adaptation directly … Read more

Frank Hopfgartner

A challenging problem in the user profiling domain is to create profiles of users of retrieval systems. This problem even exacerbates in the multimedia domain. Due to the Semantic Gap, the difference between low-level data representation of videos and the higher concepts users associate with videos, it is not trivial … Read more

Chunxi Liu

Nowdays, there are many ways for users to access video resource, and the number of videos grows rapidly. On the other hand, the user’s needs become more diversified and personalized. However, people’s capacities of using and managing video data have not increased with the growth of the video. The confliction … Read more

Oliver Lampl

This thesis investigates how adaptive QoS-aware multimedia applications are developed and the required support from the programming language and the compiler as well as the run-time system. Multimedia applications have become an increasingly important part of our lives. Many frameworks such as JMF, DirectShow, FFmpeg, GStreamer can help in the … Read more

Parag S. Mogre

Wireless Mesh Networks (WMNs) provide a novel network architecture to extend broadband network coverage with low costs. Additionally, we see an increased interest in supporting demanding multimedia applications in next-generation wireless mesh networks. Provision of Quality of Service (QoS) in wireless mesh networks requires end-to-end support for routing packets via … Read more

Sonja Bergsträsser

The importance of virtual worlds is steadily growing both in general as well as from an economical perspective and they register increasing member counts. The virtual worlds observed in research most often nowadays are the very popular gaming worlds of Multiplayer Online Games (MOGs). They are among the most popular … Read more

Matteo Varvello

A Networked Virtual Environment (NVE) is a synthetic world where human-controlled avatars can interact. Multiplayer on-line games such as Quake and World of Warcraft are the most popular applications for NVEs. In early 2003, Second Life (SL), a NVE where avatars can invent a new social life, was launched. The … Read more

Cheng Wei

High-resolution 3D meshes are increasingly available in networked applications, such as digital museum, online game, and virtual reality. The amount of data constituting a high-resolution 3D mesh can be huge, leading to long downloading time. To reduce the waiting time of users, a common technique for remote viewing is progressive … Read more

Zeljko Vrba

The appearance of commodity multi-core processors has spawned a wide interest in parallel programming, which is widely-regarded as more challenging than sequential programming. Existing distributed processing frameworks like MapReduce and Dryad are intentionally meant for large batch workloads and fail to efficiently support cyclic workloads with deadlines. In this respect, … Read more

Cheng-Hsin Hsu

Modern mobile devices have evolved into small computers that can render multimedia streaming content anywhere and anytime. These devices can extend the viewing time of users and provide more business opportunities for service providers. Mobile devices, however, make a challenging platform for providing high-quality multimedia services. The goal of this … Read more

Andreas Petlund

A large number of network services use IP and reliable transport protocols. For applications with constant pressure of data, loss is handled satisfactorily, even if the application is latency sensitive. For applications with data streams consisting of intermittently sent small packets, however, users experience extreme latencies more frequently. Due to … Read more

Aleksandra Kovacevic

Personalization of Internet services is a significant feature and exploiting the users’ location brings the most value to it. Location-based services have a wide application range – from emergency, tracking, and navigation services to informational and entertainment services. In existing centrally managed solutions, the results of location-based search are often … Read more

Sebastien Mondet

This thesis deals with the modeling and the interactive streaming of large natural 3D scenes. We aim at providing techniques to allow the remote walkthrough of users in a natural 3D scene ensuring botanical coherency and interactivity. First, we provide a compact and progressive representation for botanically realistic plant models. … Read more

Jens Brandt

The prominence of digital video on the Internet is rising constantly. Faster Internet connections and more powerful devices make video streaming over the Internet more and more popular. With mobile devices, however, the usability of digital videos that are streamed over a wireless network connection is still limited by the … Read more

Eva Hörster

With the explosion of the number of images in personal and on-line collections, efficient techniques for navigating, indexing, labeling and searching images become more and more important. In this work we will rely on the image content as the main source of information to retrieve images. We study the representation … Read more

Dewan Tanvir Ahmed

Massively Multiplayer Online Games (MMOG), now supporting millions of simultaneous participants on a regular basis, have become a significant contributor in human-to-human communications. While originally designed for games, they have now moved into serious realms of socialization, business, commerce, scientific experimentation, and others. As more and more people participate in … Read more

Behnoosh Hariri

Massively Multiuser Virtual Environments (MMVE) are network applications that simulate the experience of real-time interaction among multiple users distributed all over the internet. In order to share the common sense of time and place, multiple entities interacting in the shared virtual environment must be aware of the modifications or interactions … Read more

William Conner

Internet-based multimedia applications (e.g., voice-over-IP, instant messaging, and video conferencing) are continuing to grow in importance as more people depend on such applications for personal and professional communications. Although performance is almost always a concern with multimedia systems that must satisfy quality-of-service (QoS) constraints, security is also a major requirement … Read more

M. Shamim Hossain

The advent of service-oriented architecture (SOA), internet and ubiquitous delivery tech-nology has resulted in multimedia services (e.g. repurposing, streaming and conferencing services) being accessible at any time, from any device, through any network. However, there are still some problems related to heterogeneity, scalability and QoS demand of the management of … Read more

Arne Munch-Ellingsen

Pervasive systems, with their interconnected mesh of devices, have some similarities, but pervasive systems are mostly diverse and will certainly change over time. Within these pervasive systems, the applications come in many varieties (e.g: context aware, QoS aware, multimedia, realtime, games, discrete, ubiquitous and domain specific as in health care … Read more

Beomjoo Seo

Newly emerging game-based application systems provide three-dimensional virtual environments where multiple users interact with each other in real-time. Such virtual worlds are filled with autonomous, mutable virtual content which is continuously augmented by the users. To make the systems highly scalable and dynamically extensible, they are usually built on a … Read more

Chrisa Tsinaraki

Interoperable, semantic-based audiovisual content services are necessary in the open Internet environment, where the volume of the available audiovisual information is growing rapidly. Such services can be built on top of structured, semantic-based audiovisual content descriptions. This thesis focuses on the representation and management of the audiovisual content semantics. The … Read more

Knut-Helge Vik

One type of Internet services that have recently gained much attention are services that enable people around the world to communicate in real-time. Such services of real-time interaction are offered by applications most commonly referred to as distributed interactive applications. Concrete examples of distributed interactive applications are multiplayer online games, … Read more

Marek Meyer

This thesis investigates modular reuse of learning resources. In particular, it considers a scenario of reuse in which existing learning resources serve as preliminary products for the creation of new learning resources for Web based training. Authors are interested in reusing the learning resources created by other authors. It is … Read more

Michael Ransburg

Today’s Internet is accessible to diverse end devices through a wide variety of network types. Independent from this huge amount of usage contexts, content consumers desire to retrieve content with the best possible supported quality. The designers of new media codecs react to this diversity of usage contexts by including … Read more

Verena Kahmann

At the time being, multimedia services using IP technology are a hot topic for network and service providers. Examples are IPTV, which stands for television broadcast over a (mostly closed) network infrastructure by means of the IP suite, or video on-demand, which allows for watching selected movies via Internet on … Read more

Birgit Zimmermann

Creating high quality E-Learning material is a time and cost consuming task. Re-using existing material could reduce these costs. But often a one-to-one reuse of the existing material is not possible, as the new usage scenario differs from the original one. If, for example, a learning resource created for company … Read more

Effrosyni Kokiopoulou

Over the past few decades we have been experiencing a data explosion; massive amounts of data are increasingly collected and multimedia databases, such as YouTube and Flickr, are rapidly expanding. At the same time rapid technological advancements in mobile devices and vision sensors have led to the emergence of novel … Read more

Eunyee Koh

The importance of digital information collections is growing. Collections are typically represented with text-only, in a linear list format, which turns out to be a weak representation for cognition. We learned this from empirical research in cognitive psychology, and by conducting a study to develop an understanding of current practices … Read more

Kristopher West

This thesis presents a number of modified or novel techniques for the analysis of music audio for the purposes of classifying it according genre or implementing so called `search-by-example’ systems, which recommend music to users and generate playlists and personalised radio stations. Novel procedures for the parameterisation of music audio … Read more