@article{GoetzBrinda2013, author = {G{\"o}tz, Christian and Brinda, Torsten}, title = {Sind soziale Netzwerke geeignet, um darin f{\"u}r Informatikstudieng{\"a}nge zu werben?}, series = {Commentarii informaticae didacticae : (CID)}, journal = {Commentarii informaticae didacticae : (CID)}, number = {5}, publisher = {Universit{\"a}tsverlag Potsdam}, address = {Potsdam}, issn = {1868-0844}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-65017}, pages = {137 -- 142}, year = {2013}, abstract = {Durch den bundesweiten R{\"u}ckgang der Sch{\"u}lerzahlen und einer steigenden Zahl von Bildungsangeboten geraten Universit{\"a}ten und Hochschulen in den n{\"a}chsten Jahren weiter in eine Wettbewerbssituation, weshalb sie effektive Marketingmaßnahmen entwickeln m{\"u}ssen, um Sch{\"u}lerinnen und Sch{\"u}ler m{\"o}glichst fr{\"u}hzeitig f{\"u}r das jeweilige Angebot (z. B. Informatik- und informatiknahe Studieng{\"a}nge) zu interessieren. Ein Medium, {\"u}ber das sich potenziell sehr viele Jugendliche erreichen lassen, sind dabei soziale Netzwerke. Diese Arbeit pr{\"a}sentiert Ergebnisse einer Studie unter Informatikstudienanf{\"a}ngerinnen und -anf{\"a}ngern zum Nutzungsverhalten sozialer Netzwerke und zieht Schlussfolgerungen zu deren Eignung als Werbe- und Informationskanal f{\"u}r die Zielgruppe der Informatikinteressierten.}, language = {de} } @article{ApelBergBergneretal.2013, author = {Apel, Rebecca and Berg, Tobias and Bergner, Nadine and Chatti, Mhamed Amine and Holz, Jan and Leicht-Scholten, Carmen and Schroeder, Ulrike}, title = {Ein vierstufiges F{\"o}rderkonzept f{\"u}r die Studieneingangsphase in der Informatik}, series = {Commentarii informaticae didacticae : (CID)}, journal = {Commentarii informaticae didacticae : (CID)}, number = {5}, publisher = {Universit{\"a}tsverlag Potsdam}, address = {Potsdam}, issn = {1868-0844}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-65025}, pages = {143 -- 148}, year = {2013}, abstract = {Es wird ein vierstufiges F{\"o}rderkonzept f{\"u}r die Studieneingangsphase im Fach Informatik beschrieben, das derzeit im Rahmen des Projekts IGaDtools4MINT an der RWTH Aachen auf der Basis einer Literaturanalyse und eines daraus abgeleiteten Indikatorenkatalogs entwickelt wird.}, language = {de} } @article{SchirmerRick2013, author = {Schirmer, Ingrid and Rick, Detlef}, title = {Pers{\"o}nlichkeitsbildung und informatische Professionalisierung}, series = {Commentarii informaticae didacticae : (CID)}, journal = {Commentarii informaticae didacticae : (CID)}, number = {5}, publisher = {Universit{\"a}tsverlag Potsdam}, address = {Potsdam}, issn = {1868-0844}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-65053}, pages = {160 -- 169}, year = {2013}, language = {de} } @article{DelikostidisEngelRetsiosetal.2013, author = {Delikostidis, Ioannis and Engel, Juri and Retsios, Bas and van Elzakker, Corne P. J. M. and Kraak, Menno-Jan and D{\"o}llner, J{\"u}rgen Roland Friedrich}, title = {Increasing the usability of pedestrian navigation interfaces by means of landmark visibility analysis}, series = {The journal of navigation}, volume = {66}, journal = {The journal of navigation}, number = {4}, publisher = {Cambridge Univ. Press}, address = {New York}, issn = {0373-4633}, doi = {10.1017/S0373463313000209}, pages = {523 -- 537}, year = {2013}, abstract = {Communicating location-specific information to pedestrians is a challenging task which can be aided by user-friendly digital technologies. In this paper, landmark visibility analysis, as a means for developing more usable pedestrian navigation systems, is discussed. Using an algorithmic framework for image-based 3D analysis, this method integrates a 3D city model with identified landmarks and produces raster visibility layers for each one. This output enables an Android phone prototype application to indicate the visibility of landmarks from the user's actual position. Tested in the field, the method achieves sufficient accuracy for the context of use and improves navigation efficiency and effectiveness.}, language = {en} } @article{RichterKyprianidisDoellner2013, author = {Richter, Rico and Kyprianidis, Jan Eric and D{\"o}llner, J{\"u}rgen Roland Friedrich}, title = {Out-of-core GPU-based change detection in massive 3D point clouds}, series = {Transactions in GIS}, volume = {17}, journal = {Transactions in GIS}, number = {5}, publisher = {Wiley-Blackwell}, address = {Hoboken}, issn = {1361-1682}, doi = {10.1111/j.1467-9671.2012.01362.x}, pages = {724 -- 741}, year = {2013}, abstract = {If sites, cities, and landscapes are captured at different points in time using technology such as LiDAR, large collections of 3D point clouds result. Their efficient storage, processing, analysis, and presentation constitute a challenging task because of limited computation, memory, and time resources. In this work, we present an approach to detect changes in massive 3D point clouds based on an out-of-core spatial data structure that is designed to store data acquired at different points in time and to efficiently attribute 3D points with distance information. Based on this data structure, we present and evaluate different processing schemes optimized for performing the calculation on the CPU and GPU. In addition, we present a point-based rendering technique adapted for attributed 3D point clouds, to enable effective out-of-core real-time visualization of the computation results. Our approach enables conclusions to be drawn about temporal changes in large highly accurate 3D geodata sets of a captured area at reasonable preprocessing and rendering times. We evaluate our approach with two data sets from different points in time for the urban area of a city, describe its characteristics, and report on applications.}, language = {en} } @phdthesis{Kyprianidis2013, author = {Kyprianidis, Jan Eric}, title = {Structure adaptive stylization of images and video}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-64104}, school = {Universit{\"a}t Potsdam}, year = {2013}, abstract = {In the early days of computer graphics, research was mainly driven by the goal to create realistic synthetic imagery. By contrast, non-photorealistic computer graphics, established as its own branch of computer graphics in the early 1990s, is mainly motivated by concepts and principles found in traditional art forms, such as painting, illustration, and graphic design, and it investigates concepts and techniques that abstract from reality using expressive, stylized, or illustrative rendering techniques. This thesis focuses on the artistic stylization of two-dimensional content and presents several novel automatic techniques for the creation of simplified stylistic illustrations from color images, video, and 3D renderings. Primary innovation of these novel techniques is that they utilize the smooth structure tensor as a simple and efficient way to obtain information about the local structure of an image. More specifically, this thesis contributes to knowledge in this field in the following ways. First, a comprehensive review of the structure tensor is provided. In particular, different methods for integrating the minor eigenvector field of the smoothed structure tensor are developed, and the superiority of the smoothed structure tensor over the popular edge tangent flow is demonstrated. Second, separable implementations of the popular bilateral and difference of Gaussians filters that adapt to the local structure are presented. These filters avoid artifacts while being computationally highly efficient. Taken together, both provide an effective way to create a cartoon-style effect. Third, a generalization of the Kuwahara filter is presented that avoids artifacts by adapting the shape, scale, and orientation of the filter to the local structure. This causes directional image features to be better preserved and emphasized, resulting in overall sharper edges and a more feature-abiding painterly effect. In addition to the single-scale variant, a multi-scale variant is presented, which is capable of performing a highly aggressive abstraction. Fourth, a technique that builds upon the idea of combining flow-guided smoothing with shock filtering is presented, allowing for an aggressive exaggeration and an emphasis of directional image features. All presented techniques are suitable for temporally coherent per-frame filtering of video or dynamic 3D renderings, without requiring expensive extra processing, such as optical flow. Moreover, they can be efficiently implemented to process content in real-time on a GPU.}, language = {en} } @article{HilseLucke2013, author = {Hilse, Michael and Lucke, Ulrike}, title = {eLiS - E-Learning in Studienbereichen}, series = {E-Learning Symposium 2012 : Aktuelle Anwendungen, innovative Prozesse und neueste Ergebnisse aus der E-Learning-Praxis ; Potsdam, 17. November 2012}, journal = {E-Learning Symposium 2012 : Aktuelle Anwendungen, innovative Prozesse und neueste Ergebnisse aus der E-Learning-Praxis ; Potsdam, 17. November 2012}, publisher = {Universit{\"a}tsverlag Potsdam}, address = {Potsdam}, doi = {10.25932/publishup-44227}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-442275}, pages = {73 -- 75}, year = {2013}, abstract = {Deutsche Universit{\"a}ten erweitern ihre E-Learning-Angebote als Service f{\"u}r die Studierenden und Lehrenden. Diese sind je nach Fakult{\"a}t unterschiedlich ausgepr{\"a}gt. Dieser Artikel zeigt, wie durch technische Erweiterung der Infrastruktur, einer Anpassung der Organisationsstruktur und einer gezielten Inhaltsentwicklung eine durchg{\"a}ngige und personalisierbare Lehr- und Lernumgebung (Personal Learning Environment, PLE) geschaffen und damit die Akzeptanz bei den Lehrenden und Studierenden f{\"u}r E-Learning erh{\"o}ht werden kann. Aus der vorausgehenden, systematischen Anforderungsanalyse k{\"o}nnen Kennzahlen f{\"u}r die Qualit{\"a}tssicherung von E-Learning-Angeboten abgeleitet werden.}, language = {de} } @inproceedings{TavangarianSchroederIgeletal.2013, author = {Tavangarian, Djamshid and Schroeder, Ulrik and Igel, Christoph and Magenheim, Johannes and Kundisch, Dennis and Beutner, Marc and Herrmann, Philipp and Whittaker, Michael and Reinhardt, Wolfgang and Zoyke, Andrea and Elbeshausen, Stefanie and Griesbaum, Joachim and Koelle, Ralph and Kneiphoff, Anika Hanna and Mauch, Martina and H{\"u}bner, Sandra and Walter, Satjawan and Dittler, Ullrich and Baumann, Annette and Reeh, Lucas and Beuster, Liane and Elkina, Margarita and Fortenbacher, Albrecht and Kappe, Leonard and Merceron, Agathe and Pursian, Andreas and Schwarzrock, Sebastian and Wenzlaff, Boris and Hilse, Michael and Lucke, Ulrike}, title = {E-Learning Symposium 2012}, editor = {Lucke, Ulrike}, publisher = {Universit{\"a}tsverlag Potsdam}, address = {Potsdam}, doi = {10.25932/publishup-6162}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-62661}, pages = {77}, year = {2013}, abstract = {Dieser Tagungsband beinhaltet die auf dem E-Learning Symposium 2012 an der Universit{\"a}t Potsdam vorgestellten Beitr{\"a}ge zu aktuellen Anwendungen, innovativen Prozesse und neuesten Ergebnissen im Themenbereich E-Learning. Lehrende, E-Learning-Praktiker und -Entscheider tauschten ihr Wissen {\"u}ber etablierte und geplante Konzepte im Zusammenhang mit dem Student-Life-Cycle aus. Der Schwerpunkt lag hierbei auf der unmittelbaren Unterst{\"u}tzung von Lehr- und Lernprozessen, auf Pr{\"a}sentation, Aktivierung und Kooperation durch Verwendung von neuen und etablierten Technologien.}, language = {de} } @phdthesis{Yang2013, author = {Yang, Haojin}, title = {Automatic video indexing and retrieval using video ocr technology}, address = {Potsdam}, pages = {182 S.}, year = {2013}, language = {en} } @phdthesis{Trapp2013, author = {Trapp, Matthias}, title = {Interactive rendering techniques for focus+context visualization of 3D geovirtual environments}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-66824}, school = {Universit{\"a}t Potsdam}, year = {2013}, abstract = {This thesis introduces a collection of new real-time rendering techniques and applications for focus+context visualization of interactive 3D geovirtual environments such as virtual 3D city and landscape models. These environments are generally characterized by a large number of objects and are of high complexity with respect to geometry and textures. For these reasons, their interactive 3D rendering represents a major challenge. Their 3D depiction implies a number of weaknesses such as occlusions, cluttered image contents, and partial screen-space usage. To overcome these limitations and, thus, to facilitate the effective communication of geo-information, principles of focus+context visualization can be used for the design of real-time 3D rendering techniques for 3D geovirtual environments (see Figure). In general, detailed views of a 3D geovirtual environment are combined seamlessly with abstracted views of the context within a single image. To perform the real-time image synthesis required for interactive visualization, dedicated parallel processors (GPUs) for rasterization of computer graphics primitives are used. For this purpose, the design and implementation of appropriate data structures and rendering pipelines are necessary. The contribution of this work comprises the following five real-time rendering methods: • The rendering technique for 3D generalization lenses enables the combination of different 3D city geometries (e.g., generalized versions of a 3D city model) in a single image in real time. The method is based on a generalized and fragment-precise clipping approach, which uses a compressible, raster-based data structure. It enables the combination of detailed views in the focus area with the representation of abstracted variants in the context area. • The rendering technique for the interactive visualization of dynamic raster data in 3D geovirtual environments facilitates the rendering of 2D surface lenses. It enables a flexible combination of different raster layers (e.g., aerial images or videos) using projective texturing for decoupling image and geometry data. Thus, various overlapping and nested 2D surface lenses of different contents can be visualized interactively. • The interactive rendering technique for image-based deformation of 3D geovirtual environments enables the real-time image synthesis of non-planar projections, such as cylindrical and spherical projections, as well as multi-focal 3D fisheye-lenses and the combination of planar and non-planar projections. • The rendering technique for view-dependent multi-perspective views of 3D geovirtual environments, based on the application of global deformations to the 3D scene geometry, can be used for synthesizing interactive panorama maps to combine detailed views close to the camera (focus) with abstract views in the background (context). This approach reduces occlusions, increases the usage the available screen space, and reduces the overload of image contents. • The object-based and image-based rendering techniques for highlighting objects and focus areas inside and outside the view frustum facilitate preattentive perception. The concepts and implementations of interactive image synthesis for focus+context visualization and their selected applications enable a more effective communication of spatial information, and provide building blocks for design and development of new applications and systems in the field of 3D geovirtual environments.}, language = {en} }