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 these traditional application areas, the ...
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 and (3) non-sequential presentation of ...
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 content distribution, packets of encoded ...
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 by the self-directed interaction with ...
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 classes of approaches: graph-based semi-supervised ...
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 lifetime. Thus, self-directed learning at ...
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 technical optimization, without taking human ...
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 channel, nonverbal behavioral cues form ...
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 large-scale data and probabilistic models in ...
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 and web based photo sharing ...
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 only represent physical contents (e.g. ...
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 to reveal important behavioral clues ...
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. Humans can express when they ...
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 presented make use of common ...
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 information retrieval (CBMIR) system is ...
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 a probabilistic delay constraint composed ...
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 paradigm (SOA) offers means on ...
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 video streaming approach which uses ...
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 application, the non-functional requirements to achieve ...
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 the other hand, the analysis ...