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Image and Video Retargeting for Mobile Devices

Dr. Stephan Kopf, Universität Mannheim

24.03.2014,   14:00,   E.2.42



The talk addresses the challenge of image and video visualization on mobile devices. Nowadays, mobile devices like tablets or smartphones are widely used for the capturing and the visualization of multimedia data. The resolution of the display and of the captured pictures does typically not match, and the image content is thus scaled down when presented. This may cause a significant loss in picture quality, where details are no longer recognizable. Also, scaling does not work well when the aspect ratios of the picture and the screen differ. Unnaturally stretched objects are a result. On the contrary, image and video retargeting techniques like seam carving or warping only modify non-relevant image areas and preserve the most important visual content.
The talk presents state-of-the-art algorithms for image and video retargeting. These methods identify and preserve important objects in images and videos, combine different retargeting operators, and – in the case of video retargeting – avoid temporal inconsistencies. Extensions for stereoscopic images and videos are discussed as well.

Short CV: Dr. Stephan Kopf received his diploma in business informatics (2000) and his Ph.D. in computer science (2007) both from the University of Mannheim (Germany). He completed his habilitation (postdoctoral lecture qualification) in 2012 and is currently working as senior researcher and lecturer at the Department of Networks and Multimedia at the University of Mannheim. His research focuses on multimedia content analysis, media retargeting, high dynamic range video, shape-based object recognition, and digital video watermarking. He has published over 80 refereed journal and conference papers in these fields. Dr. Kopf received the best paper award at the ACM Multimedia Systems conference in 2014. He served as technical program chair of ACM ICIMCS, as guest editor of MTAP, and on the program committee of several conferences and workshops. He is a member of IEEE, ACM and ACM SIGMM.

Kopf

 

Rückblick: “BigMedia”: Multimedia goes Big Data [Slides][Video]



Der Rückblick zum TEWI-Kolloquium von Max Mühlhäuser am 26.01.2015 beinhaltet die Videoaufzeichnung sowie die Folien:

Video

Slides

Big Media: Multimedia goes Big Data from Förderverein Technische Fakultät

Abstract:

Ever more multimedia data gets produced, stored, and shared. This is a well-known phenomenon and quite common for information technology, one might say, but multimedia as a field of computing has always been aiming at humans rather than computers as ultimate consumers: computing was mostly an auxiliary on the path from media creation to human consumption. Despite increasing automation, human consumption is likely to remain the dominating multimedia use case. Since humans have rather fixed sensing and processing capabilities, the dramatic increase in multimedia data production and online availability poses particular ” multimedia big data” challenges – the more so since the characteristics of multimedia make the well-known “four V” of big data particularly virulent.

In light of the aforementioned development, the talk will look at big data challenges for multimedia and at upcoming approaches to meeting these challenges. The problem space will be structured according to an imaginary “processing pipeline” that starts from media capturing via networking and storage/processing until presentation/consumption. Some nonfunctional aspects such as privacy will be addressed, too.

Bio: Max Mühlhäuser is a Full Professor of Computer Science at Technische Universität Darmstadt, Germany, and head of the Telecooperation Lab. In 1986, he received his Doctorate from the University of Karlsruhe and soon afterwards founded the first European research center for Digital Equipment Corp. (DEC). Since 1989, he worked as either professor or visiting professor at universities in Germany, Austria, France, Canada, and the US. Max published more than 450 articles, co-authored and edited books about Ubiquitous Computing, E-learning, and distributed & multimedia software engineering. Max is deputy speaker of a nationally funded cooperative research center on the Future Internet and directorate member of the Center for Advanced SEcurity research Darmstadt (CASED).

UW-OFDM: Non-linear Receivers

Dr. Alexander Onic, Infineon Technologies Linz

26. 01. 2015,   10:00 Uhr,   Raum L.4.101, B04 Lakeside Park



Abstract:

The engineering world is mostly made up from the reuse, reinvention or reapplication of old knowledge, rather than single groundbreaking new findings. Each small advance contributes to human knowledge with an impact that can’t be seen usually until many years later.

As an example, a research summary of non-linear receivers for Unique Word OFDM (orthogonal frequency division multiplexing) is presented, where several data detection techniques for MIMO (multi-antenna) communication systems are reused for a single-antenna setup. This is enabled by the UW-OFDM concept, which opens the range from Bayesian linear data estimation to maximum likelihood detection, opposing to the formerly dull data detection method for classical OFDM.

As an industry example, the limiting factors of the signal sensitivity in FMCW (frequency modulated continuous wave) Radar transceivers are addressed. The problem of on-chip leakage is an inherent problem of signal processing in MMICs (monolithic microwave integrated circuits). How it has been handled in communication ICs might be a clue for how to remarkably enhance FMCW Radar in the future.

Biography:

Alexander Onic is currently Concept Engineer for automotive Radar at Infineon Technologies in Linz, Austria. He received the doctoral degree from Alpen-Adria-Universität Klagenfurt in 2013, where he was part of the research team that invented Unique Word OFDM, a novel signaling scheme for digital communication. In 2007, he graduated with the Dipl.-Ing. degree from Friedrich-Alexander-Universität Erlangen-Nürnberg, after studying electrical engineering with an emphasis on information technology and signal processing. Alex’ research interest in signal processing, communication engineering and estimation theory is consequently supplemented by the research cooperation of Infineon and Johannes-Kepler-Universität Linz on Radar signal processing topics.

“BigMedia”: Multimedia goes Big Data

Prof. Max Mühlhäuser, Telecooperation Lab, Technische Universität Darmstadt

26. 01. 2015,   11:00 Uhr,   Z.1.09



Abstract:

Ever more multimedia data gets produced, stored, and shared. This is a well-known phenomenon and quite common for information technology, one might say, but multimedia as a field of computing has always been aiming at humans rather than computers as ultimate consumers: computing was mostly an auxiliary on the path from media creation to human consumption. Despite increasing automation, human consumption is likely to remain the dominating multimedia use case. Since humans have rather fixed sensing and processing capabilities, the dramatic increase in multimedia data production and online availability poses particular ” multimedia big data” challenges – the more so since the characteristics of multimedia make the well-known “four V” of big data particularly virulent.

In light of the aforementioned development, the talk will look at big data challenges for multimedia and at upcoming approaches to meeting these challenges. The problem space will be structured according to an imaginary “processing pipeline” that starts from media capturing via networking and storage/processing until presentation/consumption. Some nonfunctional aspects such as privacy will be addressed, too.

Biography:

Max Mühlhäuser is a Full Professor of Computer Science at Technische Universität Darmstadt, Germany, and head of the Telecooperation Lab. In 1986, he received his Doctorate from the University of Karlsruhe and soon afterwards founded the first European research center for Digital Equipment Corp. (DEC). Since 1989, he worked as either professor or visiting professor at universities in Germany, Austria, France, Canada, and the US. Max published more than 450 articles, co-authored and edited books about Ubiquitous Computing, E-learning, and distributed & multimedia software engineering. Max is deputy speaker of a nationally funded cooperative research center on the Future Internet and directorate member of the Center for Advanced SEcurity research Darmstadt (CASED).

Privacy and Security Challenges in the Smart Grid User Domain

Prof. (FH) Dominik Engel, Director of Josef Ressel Center for User-Centric Smart Grid Privacy, Security and Control, Salzburg University of Applied Sciences

27.01.2015,   14:00,   E.1.42



The term “smart grids” is used to describe the next-generation intelligent energy systems. Smart grids employ state-of-the-art information and communication technology to control generation, distribution and consumption of energy. The degree of information needed on network status is vastly more accurate compared to traditional power networks, and needs to be available in fine granularity in near real-time. The availability of such fine-grained data raises severe privacy concerns in the end-user domain.  For example, the application of non-intrusive load monitoring techniques to high-resolution load profiles allows inferring details on user behavior such as presence, sleep-and-wake cycles and the brands of used appliances. Another challenge in the widespread adoption of smart grid technologies lies in the domain of security. Recent reports of smart meters that can easily be hacked and used to remotely control energy availability in the connected household have not helped to increase user trust. In this talk, the main challenges in the area of smart grid privacy and security from an end-user perspective will be reviewed. At the example of smart metering, selected solutions will be discussed in detail.

Dominik Engel is a professor at the Salzburg University of Applied Sciences in Austria, where he heads the Josef Ressel Center for User-Centric Smart Grid Privacy, Security and Control. He holds a PhD degree in Computer Science from the University of Salzburg. Prior to joining Salzburg University of Applied Sciences, Dominik Engel was a researcher at the Universities of Bremen and Salzburg and product manager at Sony DADC, where he was responsible for video content security. His research interests include smart grid security, multimedia security and technological methods for enhancing end-user trust.

 

 

Frohe Weihnachten und viel Erfolg für 2015



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Der Förderverein Technische Fakultät an der Alpen-Adria-Universität Klagenfurt wünscht allen Mitgliedern ein frohes Weihnachtsfest und einen guten Start in ein erfolgreiches Jahr 2015!

CECC 2015: 15th Central European Conference on Cryptology



The 15th Central European Conference on Cryptology, CECC 2015, is organised by the Institute of Mathematics and the System Security Group of Alpen-Adria-Universität Klagenfurt.

The conference will be held in Klagenfurt am Wörthersee, Austria, on July 8-10, 2015, at the university campus.

The aim of the conference is to gather researchers interested in discussing recent advances in all aspects of cryptology, including but not limited to:

  • cryptanalysis
  • cryptographic applications in information security
  • design of cryptographic systems
  • encryption schemes
  • general cryptographic protocols
  • post-quantum cryptography
  • pseudorandomness
  • signature schemes
  • steganography

All participants are encouraged to present a contributed talk. Registration and abstract submission will be opened on December 15, 2014.

Further information at https://www.math.aau.at/cecc2015/

Österreichische Computer Gesellschaft (OCG): Förderpreis



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Ausschreibung 2015: Die Ausschreibung für den OCG Förderpreis 2015 endet am 9. Dezember 2014

Motivation

Die OCG verleiht zur Förderung der Informatik und Wirtschaftsinformatik jährlich den OCG-Förderpreis.

Ziel

Die Förderung von hervorragenden Diplom- bzw. Magisterarbeiten

Zielgruppe

Alle Studentinnen und Studenten mit Diplomarbeiten bzw. Magisterarbeiten auf dem Gebiet der Informatik, Wirtschaftsinformatik und ihren Anwendungen

Konzept

Zur Bewerbung ist ein Online-Formular auszufüllen, die zu prüfende Arbeit, eine (max. zehnseitige) Kurzfassung sowie ein ausführliches Literaturverzeichnis sind auf der OCG Website innerhalb der Einreichfrist hochzuladen.
Eine Erstreckung der Einreichfrist ist nicht möglich.

Voraussetzung

Die eingereichte Arbeit muss innerhalb der letzten zwei Jahre an einer österreichischen Universität approbiert worden sein. Die eingereichten Unterlagen verbleiben bei der Österreichischen Computer Gesellschaft.

Preise

Der OCG-Förderpreis wird mit Euro 2.000,- dotiert.

Jury

  • Prof. Dr. Günter Haring (Vorsitz)
  • Prof. Dr. Martin Hitz
  • Prof. Dr. Gerti Kappel
  • Prof. Dr. Gabriele Anderst-Kotsis
  • Prof. Dr. Gustaf Neumann
  • Prof. Dr. Franz Wotawa

Efficient retrieval using models based on feature signatures

Dr. Jakub Lokoc, SIRET research group, Charles Univerity Prague, Czech Republik

20.11.2014,   08:30 Uhr,   E.2.42



Abstract: Recent trends in large-scale image retrieval consider image representations based on the Bag of Visual Words model, because such representation enables efficient filtering using inverted files, while for more effective retrieval the representation can be enhanced by VLAD or Hemming embedding. In order to improve the effectiveness of the retrieval even more, some models try to relax from Bag of Visual Words model (i.e., from a shared feature space dictionary) and model content of multimedia objects by means of so-called feature signatures. Whereas the effectiveness of models based on feature signatures seems to be promising for several retrieval tasks, the efficiency of the models still represents a serious performance bottleneck, because the models employ expensive adaptive distance measures to compare two feature signatures. In this talk, we present several recent approaches that significantly improve the efficiency of the retrieval when using models based on feature signatures, making the models applicable also for large-scale image retrieval.

CV: Jakub Lokoc received the doctoral degree in software systems from the Charles University in Prague, Czech Republic. He is an assistant professor in the Department of Software Engineering at the Charles University in Prague, Faculty of Mathematics and Physics, Czech Republic. He is a member of siret research group and his research interests include metric access methods, multimedia retrieval and exploration, and similarity modeling.

Lokoc

Rückblick: Quality of Experience – Why Bother? [Slides][Video]



Der Rückblick zum TEWI-Kolloquium von Martin Varela am 27.10.2014 beinhaltet die Videoaufzeichnung sowie die Folien:

Video

Slides

Quality of Experience – Why Bother? from Förderverein Technische Fakultät

Abstract: In this talk I’ll discuss some ideas about the reasons, both technical and business-related why we care about Quality of Experience (QoE). I’ll present some results related to QoE-driven network and application-level management, and first steps into economically exploiting QoE models, in particular concerning Service Level Agreements, as well as some enablers for doing so.

Bio: Martín Varela received his PhD and MSc from the University of Rennes 1 (Rennes,France), in 2005 and 2002 respectively. He has been an ERCIM fellow, and spent time at SICS and VTT, where he is currently a Principal Scientist. His research interests lie in the QoE domain, with a particular focus on real-time QoE estimates for generic services and applications thereof. He is currently leading VTT’s work on QoE, and is a Finnish management committee member for COST Action IC1003 Qualinet. He has also served as Scientific Coordinator for the Celtic Plus QuEEN project. He is currently co-chair for the IEEE MMTC QoE Interest Group.