Publications of Wolfgang Effelsberg

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Artikel

Konferenz Beitrag

  • Johannes Kiess, Daniel Gritzner, Benjamin Guthier, Stephan Kopf und Wolfgang Effelsberg. ACM, 2014 GPU Video Retargeting with Parallelized SeamCrop . New York, NY
  • Stephan Kopf, Benjamin Guthier, Christopher Hipp, Johannes Kiess und Wolfgang Effelsberg. IEEE, 2014 Warping-based video retargeting for stereoscopic video . Piscataway, NJ
  • Philip Mildner, Christopher Campbell und Wolfgang Effelsberg. Springer Internat., 2014 Word Domination: Bringing Together Fun and Education in an Authoring-Based 3D Shooter Game Lecture Notes in Computer Science. Cham [u.a.]In this paper, the multiplayer serious game Word Domination is presented. The key aspects of this project are to create one fixed game scenario with strong emphasis on motivational aspects and to combine this with a variable learning content. Therefore, a web based authoring tool has been created that allows for the integration of arbitrary quizzes into the game. This frees teachers from hassling with game design details. At the same time, it offers players the same level of engaging gameplay throughout different learning scenarios by making use of the popularity of 3D shooter games. Apart from the beneficial aspects of in game learning, the game also offers rankings and statistics, which might serve as a motivational aspect on the one hand, and as an evaluation tool for instructors on the other hand. In addition to a description of game mechanisms and the technical background of the game, this paper will present suggestions for application scenarios and further development possibilities. Some player impressions and reactions were gathered in a study at the University of Mannheim and at the Darmstadt GameDays 2013 exhibition, during which the game was played by a broad audience.
  • Philip Mildner, Benjamin John, Alexander Moch und Wolfgang Effelsberg. IEEE, 2014 Creation of Custom-made Serious Games with User-generated Learning Content . Piscataway, NJIntegrating user-generated content into digital games helps to increase re-usability and to decrease development effort. In terms of learning games, the content creation can be extended to the learning parts of the game as well, e.g., allowing teachers to create custom games for their students. In this work, we propose a method of how to create learning games with arbitrary user-generated learning content. This includes not only different topics of learning content, but also different types of knowledge acquisition. To do this we combine a static game scenario with lightweight HTML5-based mini games. Learning content can be conveniently added through a web-based authoring tool that does not require any programming or game design knowledge. In addition to that, we created a game prototype based on the Unity3D engine that uses a tower defence game setting to integrate the learning content. These mini games are retrieved from the backend service at runtime. The implemented solution already allows for the integration of arbitrary content and can easily extended without altering the game client.
  • Björn Richerzhagen, Stefan Wilk, Julius Rückert, Denny Stohr und Wolfgang Effelsberg. ACM, 2014 Transitions in live video streaming services . New York, NY
  • Philipp Schaber, Stephan Kopf, Christoph Wesch und Wolfgang Effelsberg. ACM, 2014 CamMark : a camcorder copy simulation as watermarking benchmark for digital video . New York, NYIn 1998, Petitcolas et al. proposed StirMark as a benchmark for image watermarking schemes. The main idea was to introduce a re-sampling process that mimics the analog process of printing and scanning a watermarked image. For digital video, the corresponding concept is a camcorder copy, where a video displayed on a screen is (digitally) recorded using a video camera. As most commercial video streaming systems (VOD, IPTV) and offline distribution (Blu-ray, HDDs for cinemas) are strongly protected by means of DRM, filming a display is actually a relevant use case and a requirement for robust video watermarking systems to survive. We therefore present a tool to simulate content re-acquisition with a camcorder. Our goal is to support watermark development by enabling automated test cases for such camcorder copy attacks, as well as to provide a benchmark for robust video watermarking. Manually creating camcorder copies is a cumbersome process, and even more problematic, it is hardly reproducible with the same setup. By re-sampling each video frame, we simulate the typical artifacts of a camcorder copy: geometric modifications (aspect ratio changes, cropping, perspective and lens distortion), temporal modifications (unsynchronized frame rates and the resulting frame blending), sub-sampling (rescaling, filtering, Bayer color array filter), and histogram changes (AGC, AWB). We also support simulating camera movement (e.g., a hand-held camera) and background insertion.
  • Daniel Schön, Philip Mildner, Stephan Kopf und Wolfgang Effelsberg. Gesellschaft für Informatik, 2014 SMASH: Ein generisches System für interaktive Szenarien in der Vorlesung GI-Edition : Lecture Notes in Informatics. Proceedings. Freiburg, Br.
  • Daniel Schön, Steffen Sikora, Stephan Kopf und Wolfgang Effelsberg. RWTH, 2014 GLA: A Generic Analytics Tool for e-Learning CEUR Workshop Proceedings. AachenSeveral software applications are used at the University of Mannheim for learning and teaching purposes. The majority of them, like lecture feedback, quizzes, forums, and wikis, are hosted within our learning management system ILIAS. In addition, we run several prototypes of serious games and mobile feedback systems. While the data generated by students and teachers is mainly used for current courses, it could be further used for Learning Analytics if it was stored in an adequate format. Considering the variable and fast-moving nature of our learning applications, we invented a concept for a generic database structure, that can handle analyses on a variety of original tools. This paper presents the prototype application GLA (Generic Learning Analytics), which tries to provide a step in the right direction. Data from wikis, forums, quizzes and serious games transformed into one homogeneous format that can be used to do comparable analyzes. Beside comparing several semesters and courses of one application, we can also match related data sets e. g. user behavior between a wiki and a file upload.
  • Denny Stohr, Stefan Wilk und Wolfgang Effelsberg. ACM, 2014 Monitoring of User Generated Video Broadcasting Services . New York, NY
  • Lydia Weiland, Wolfgang Effelsberg und Simone Paolo Ponzetto. Asooc. for Computational Linguistics, 2014 Weakly supervised construction of a repository of iconic images . Stroudsburg, Pa.We present a first attempt at semi-automatically harvesting a dataset of iconic images, namely images that depict objects or scenes, which arouse associations to abstract topics. Our method starts with representative topic-evoking images from Wikipedia, which are labeled with relevant concepts and entities found in their associated captions. These are used to query an online image repository (i.e., Flickr), in order to further acquire additional examples of topic-specific iconic relations. To this end, we leverage a combination of visual similarity measures, image clustering and matching algorithms to acquire clusters of iconic images that are topically connected to the original seed images, while also allowing for various degrees of diversity. Our first results are promising in that they indicate the feasibility of the task and that we are able to build a first version of our resource with minimal supervision.
  • Stefan Wilk und Wolfgang Effelsberg. ACM, 2014 Mobile video broadcasting services - combining video composition and network efficient transmission . New York, NY
  • Stefan Wilk und Wolfgang Effelsberg. ACM, 2014 Systematic assessment of the video recording position for user-generated event videos . New York, NY
  • Stefan Wilk und Wolfgang Effelsberg. IEEE, 2014 The influence of camera shakes, harmful occlusions and camera misalignment on the perceived quality in user-generated video . Piscataway, NJ [u.a.]
[2018] [2017] [2016] [2015] 2014 [2013] [2012] [2011] [2010] [2009] [2008] [2007] [2006] [2005] [2004] [2003] [2002] [2001] [2000] [1999] [1998] [1997] [1996] [1995] [1994] [1993] [1992] [1991] [1990] [1988] [1987] [1986] [1985] [1984] [1983] [1981] [1980] [1979]