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Suche nach „[2012]“ hat 264 Publikationen gefunden
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    DigitalAngewandte Informatik

    Zeitschriftenartikel

    M. Pinson, L. Janowski, R. Pepion, Q. Huynh-Thu, C. Schmidmer, P. Corriveau, A. Younkin, P. Le Callet, Marcus Barkowsky, W. Ingram

    The Influence of Subjects and Environment on Audiovisual Subjective Tests: An International Study

    IEEE Journal of Selected Topics in Signal Processing, vol. 6, no. 6, pp. 640-651

    2012

    DOI: 10.1109/JSTSP.2012.2215306

    Abstract anzeigen

    Traditionally, audio quality and video quality are evaluated separately in subjective tests. Best practices within the quality assessment community were developed before many modern mobile audiovisual devices and services came into use, such as internet video, smart phones, tablets and connected televisions. These devices and services raise unique questions that require jointly evaluating both the audio and the video within a subjective test. However, audiovisual subjective testing is a relatively under-explored field. In this paper, we address the question of determining the most suitable way to conduct audiovisual subjective testing on a wide range of audiovisual quality. Six laboratories from four countries conducted a systematic study of audiovisual subjective testing. The stimuli and scale were held constant across experiments and labs; only the environment of the subjective test was varied. Some subjective tests were conducted in controlled environments and some in public environments (a cafeteria, patio or hallway). The audiovisual stimuli spanned a wide range of quality. Results show that these audiovisual subjective tests were highly repeatable from one laboratory and environment to the next. The number of subjects was the most important factor. Based on this experiment, 24 or more subjects are recommended for Absolute Category Rating (ACR) tests. In public environments, 35 subjects were required to obtain the same Student\textquoterights t-test sensitivity. The second most important variable was individual differences between subjects. Other environmental factors had minimal impact, such as language, country, lighting, background noise, wall color, and monitor calibration. Analyses indicate that Mean Opinion Scores (MOS) are relative rather than absolute. Our analyses show that the results of experiments done in pristine, laboratory environments are highly representative of those devices in actual use, in a typical user environment.

    DigitalAngewandte Informatik

    Zeitschriftenartikel

    P. Lebreton, A. Raake, Marcus Barkowsky, P. Le Callet

    Evaluating Depth Perception of 3D Stereoscopic Videos

    IEEE Journal of Selected Topics in Signal Processing, vol. 6, no. 6, pp. 710-720

    2012

    Abstract anzeigen

    3D video quality of experience (QoE) is a multidimensional problem; many factors contribute to the global rating like image quality, depth perception and visual discomfort. Due to this multidimensionality, it is proposed in this paper, that as a complement to assessing the quality degradation due to coding or transmission, the appropriateness of the non-distorted signal should be addressed. One important factor here is the depth information provided by the source sequences. From an application-perspective, the depth-characteristics of source content are of relevance for pre-validating whether the content is suitable for 3D video services. In addition, assessing the interplay between binocular and monocular depth features and depth perception are relevant topics for 3D video perception research. To achieve the evaluation of the suitability of 3D content, this paper describes both a subjective experiment and a new objective indicator to evaluate depth as one of the added values of 3D video.

    DigitalAngewandte Informatik

    Beitrag (Sammelband oder Tagungsband)

    M. Urvoy, Marcus Barkowsky, J. Gutiérrez, R. Cousseau, Y. Koudota, V. Ricordel, P. Le Callet, N. García

    NAMA3DS1-COSPAD1: Subjective video quality assessment database on coding conditions introducing freely available high quality 3D stereoscopic sequences

    2012 Fourth International Workshop on Quality of Multimedia Experience

    2012

    Abstract anzeigen

    Research in stereoscopic 3D coding, transmission and subjective assessment methodology depends largely on the availability of source content that can be used in cross-lab evaluations. While several studies have already been presented using proprietary content, comparisons between the studies are difficult since discrepant contents are used. Therefore in this paper, a freely available dataset of high quality Full-HD stereoscopic sequences shot with a semiprofessional 3D camera is introduced in detail. The content was designed to be suited for usage in a wide variety of applications, including high quality studies. A set of depth maps was calculated from the stereoscopic pair. As an application example, a subjective assessment has been performed using coding and spatial degradations. The Absolute Category Rating with Hidden Reference method was used. The observers were instructed to vote on video quality only. Results of this experiment are also freely available and will be presented in this paper as a first step towards objective video quality measurement for 3DTV.

    DigitalAngewandte Informatik

    Beitrag (Sammelband oder Tagungsband)

    J. Li, Marcus Barkowsky, P. Le Callet

    Analysis and Improvement of a Paired Comparison Method in the Application of 3DTV Subjective Experiment

    2012 19th IEEE International Conference on Image Processing

    2012

    Abstract anzeigen

    Paired comparison is a frequently used method in psychophysical studies. However, with the increase of the number of the stimuli, the number of comparisons increases exponentially. Square design is one of the balanced sub-set paired comparison methods which could reduce the number of comparisons while producing comparably precise results under some assumptions. However, when there are observation errors from observers' attentiveness, the square design would produce large estimation errors. Thus, an improved square design which is robust to observation errors is proposed. Using a Monte Carlo simulation, the proposed method is evaluated and shows improvement in efficiency. The original design is applied in a visual discomfort subjective test of 3DTV. In addition, both of the two designs are studied by utilizing our previous full comparison data. The test results showed that the proposed improved square design is more robust to observation errors. Another important finding is that the influence of the occurrence of some other stimuli on voting is significant. Whether the proposed method could reduce the prediction errors induced by it is still under study.

    DigitalAngewandte Informatik

    Zeitschriftenartikel

    K. Wang, Marcus Barkowsky, K. Brunnström, M. Sjöström, R. Cousseau, P. Le Callet

    Perceived 3D TV Transmission Quality Assessment: Multi-Laboratory Results Using Absolute Category Rating on Quality of Experience Scale

    IEEE Transactions on Broadcasting, vol. 58, no. 4, pp. 544-557

    2012

    Abstract anzeigen

    Inspired by the rapidly increasing popularity of 3D movies, there is an industrial push for 3DTV services to the home. One important factor for the success and acceptance by the viewers is a positive quality of experience (QoE) of the new service when delivered. The questions of how to efficiently deliver 3DTV service to the home, and how to evaluate the visual quality perceived by end users are a recent research focus. We have investigated users\textquoteright experience of stereoscopic 3D video quality by preparing two subjective assessment datasets. The first dataset aimed at the evaluation of efficient transmission in the transmission error free case, while the second focused on error concealment. A total of three subjective assessments, two for first dataset and one for the second, were performed using the Absolute Category Rating with Hidden unimpaired Reference video (ACR-HR) method. The experimental setup allows to show that the ACR-HR subjective method provides repeatable results across labs and across conditions for video quality. It was also verified that MVC is more efficient than H.264 simulcast coding. Furthermore it was discovered that based on the same level of quality of experience spatial down-sampling may lead to better bitrate efficiency while temporal down-sampling is not acceptable. When network impairments occur, traditional error 2D concealment methods need to be reinvestigated as they were outperformed by displaying the same view for both eyes (switching to 2D presentation).

    DigitalAngewandte Informatik

    Beitrag (Sammelband oder Tagungsband)

    S. Tourancheau, K. Wang, J. Bulat, R. Cousseau, L. Janowski, K. Brunnström, Marcus Barkowsky

    Reproducibility of crosstalk measurements on active glasses 3D LCD displays based on temporal characterization

    Proceedings of SPIE Vol. 8288: Stereoscopic Displays and Applications XXIII

    2012

    ISBN: 9780819489357

    Abstract anzeigen

    Crosstalk is one of the main display-related perceptual factors degrading image quality and causing visual dis-comfort on 3D-displays. It causes visual artifacts such as ghosting eects, blurring, and lack of color delitywhich are considerably annoying and can lead to diculties to fuse stereoscopic images. On stereoscopic LCDwith shutter-glasses, crosstalk is mainly due to dynamic temporal aspects: imprecise target luminance (highlydependent on the combination of left-view and right-view pixel color values in disparity regions) and synchro-nization issues between shutter-glasses and LCD. These dierent factors inuence largely the reproducibilityof crosstalk measurements across laboratories and need to be evaluated in several dierent locations involvingsimilar and diering conditions. In this paper we propose a fast and reproducible measurement procedure forcrosstalk based on high-frequency temporal measurements of both display and shutter responses. It permitsto fully characterize crosstalk for any right/left color combination and at any spatial position on the screen.Such a reliable objective crosstalk measurement method at several spatial positions is considered a mandatoryprerequisite for evaluating the perceptual inuence of crosstalk in further subjective studies.

    DigitalAngewandte Informatik

    Beitrag (Sammelband oder Tagungsband)

    K. Brunnström, I. Sedano, K. Wang, Marcus Barkowsky, M. Kihl, P. Le Callet, Patrick, M. Sjöström, A. Aurelius

    2D No-Reference Video Quality Model Development and 3D Video Transmission Quality

    Sixth International Workshop on Video Processing and Quality Metrics for Consumer Electronics - VPQM 2012 (Jan 2012; Scottsdale, AZ, USA)

    2012

    Abstract anzeigen

    This presentation will target two different topics in video quality assessment. First, we discuss 2D no-reference video quality model development. Further, we discuss how to find suitable quality for 3D video transmission. No-reference metrics are the only practical option for monitoring of 2D video quality in live networks. In order to decrease the development time, it might be possible to use full-reference metrics for this purpose. In this work, we have evaluated six full-reference objective metrics in three different databases. We show statistically that VQM performs the best. Further, we use these results to develop a lightweight no-reference model. We have also investigated users' experience of stereoscopic 3D video quality by performing the rating of two subjective assessment datasets, targeting in one dataset efficient transmission in the transmission error free case and error concealment in the other. Among other results, it was shown that, based on the same level of quality of experience, spatial down-sampling may lead to better bitrate efficiency while temporal down-sampling will be worse. When network impairments occur, traditional error 2D concealment methods need to be reinvestigated as they were outperformed switching to 2D presentation.

    DigitalAngewandte Informatik

    Beitrag (Sammelband oder Tagungsband)

    W. Chen, J. Fournier, Marcus Barkowsky, P. Le Callet

    Exploration of Quality of Experience of Stereoscopic Images: Binocular Depth

    Sixth International Workshop on Video Processing and Quality Metrics for Consumer Electronics - VPQM 2012 (Jan 2012; Scottsdale, AZ, USA)

    2012

    DigitalAngewandte Informatik

    Beitrag (Sammelband oder Tagungsband)

    Y. Pitrey, P. Hummelbrunner, B. Kitzinger, S. Buchinger, Marcus Barkowsky, P. Le Callet, R. Pepion

    Influence of Shooting Conditions, Re-Encoding and Viewing Conditions on the Perceived Quality of User-Generated Videos

    Sixth International Workshop on Video Processing and Quality Metrics for Consumer Electronics - VPQM 2012 (Jan 2012; Scottsdale, AZ, USA)

    2012

    Angewandte Wirtschaftswissenschaften

    Buch (Monographie)

    J. Kluge, A. Montén, Wolfgang Nagl, B. Schirwitz, M. Thum

    Wachstum und Beschäftigung am Wirtschaftsstandort Dresden

    Gutachten im Auftrag der Landeshauptstadt Dresden

    ifo Dresden Studien, München, vol. 64

    2012

    ISBN: 978-3-88512-527-3

    Abstract anzeigen

    Die Landeshauptstadt Dresden konnte in den letzten beiden Jahrzehnten ein kräftiges Wirtschaftswachstum vorweisen. Doch während die Wachstumsraten der Bruttowertschöpfung bis 2004 teilweise deutlich oberhalb des sächsischen Durchschnitts lagen, erlitt die Stadt 2005 einen dramatischen Einbruch und blieb seitdem dahinter zurück. Im gleichen Zeitraum entwickelte sich die Erwerbstätigkeit jedoch weiterhin überdurchschnittlich positiv. Eine Analyse der Wirtschaftsstruktur Dresdens soll die Gründe für das schwache Wachstum seit 2005 aufzeigen und erklären, wieso es kaum auf den Arbeitsmarkt durchzuschlagen scheint.

    Angewandte Wirtschaftswissenschaften

    Zeitschriftenartikel

    K. Baum, Wolfgang Nagl

    Bevölkerungsentwicklung und Wirtschaftswachstum in der Region Dresden (REGKLAM) bis 2025

    ifo Dresden berichtet, vol. 19, no. 03, pp. 30-34

    2012

    Abstract anzeigen

    Ob und wie stark die Bevölkerung schrumpft und wie stark sie gleichzeitig altert, kann regional sehr unterschiedlich sein. Für die Modellregion Dresden (REGKLAM) wird in einer kleinräumigen Analyse gezeigt, welche Tendenzen sich bei der Bevölkerungsentwicklung abzeichnen und welche Folgen sich daraus für die wirtschaftliche Entwicklung bis 2025 ergeben. Die Wirtschaft wird sich in der REGKLAM Region aufgrund des Bevölkerungsrückganges weniger dynamisch entwickeln. Die Stadt Dresden wächst aber gegen den Trend, sodass deren Bedeutung in der Region noch weiter zunimmt.

    Angewandte Wirtschaftswissenschaften

    Zeitschriftenartikel

    R. Lehmann, Wolfgang Nagl

    Wo leben welche Migranten aus Deutschlands Nachbarländern? Eine Analyse auf Kreisebene

    ifo Dresden berichtet, vol. 19, no. 06, pp. 31-35

    2012

    Abstract anzeigen

    Der demographische Wandel in Deutschland führt zu einer Schrumpfung des Erwerbspersonenpotenzials und damit zu einer Verknappung von Fachkräften. Eine Möglichkeit, dieser Verknappung zu begegnen, liegt in der Attrahierung geeigneter Fachkräfte aus dem Ausland. Die ökonomische Theorie beschreibt einen positiven Einfluss der räumlichen Nähe auf die Migrationsentscheidung, so dass eine überproportionale Ansiedlung von Migranten in der Nähe ihres Heimatlandes zu vermuten ist. Eine Untersuchung der Niederlassung Dresden des ifo Instituts bestätigt diese Vermutung für den Großteil der Nachbarländer Deutschlands. Nur für Migranten aus Polen kann dieses Muster nicht bestätigt werden.

    Angewandte Wirtschaftswissenschaften

    Zeitschriftenartikel

    R. Lehmann, Wolfgang Nagl

    Wo leben welche Migranten aus Deutschlands Nachbarländern? Eine Analyse auf Kreisebene

    ifo Schnelldienst, vol. 65, no. 23, pp. 27-31

    2012

    Abstract anzeigen

    Der demographische Wandel in Deutschland führt zu einer Schrumpfung des Erwerbspersonenpotenzials und damit zu einer Verknappung von Fachkräften. Eine Möglichkeit, dieser Verknappung zu begegnen, liegt in der Attrahierung geeigneter Fachkräfte aus dem Ausland. Die ökonomische Theorie beschreibt einen positiven Einfluss der räumlichen Nähe auf die Migrationsentscheidung, so dass eine überproportionale Ansiedlung von Migranten in der Nähe ihres Heimatlandes zu vermuten ist. Eine Untersuchung der Niederlassung Dresden des ifo Instituts bestätigt diese Vermutung für den Großteil der Nachbarländer Deutschlands. Nur für Migranten aus Polen kann dieses Muster nicht bestätigt werden.

    Angewandte Wirtschaftswissenschaften

    Zeitschriftenartikel

    Wolfgang Nagl, J. Ragnitz

    Drei Irrtümer über die gesetzliche Rente

    Wirtschaftsdienst - Zeitschrift für Wirtschaftspolitik, vol. 92, no. 11, pp. 759-762

    2012

    Abstract anzeigen

    Die Öffentlichkeit unterliegt drei Irrtümern in Hinblick auf die gesetzliche Rente: Es wird behauptet, dass die Rente mit 67 rentenkürzend wirkt, dass die Renten im Osten Deutschlands geringer sind als im Westen, und dass eine Ausweitung der Beitragsbemessungsgrenze die Finanzierungsprobleme der Gesetzlichen Rentenversicherung löst. All diese Irrtümer stellen die Autoren richtig.

    DigitalAngewandte WirtschaftswissenschaftenTC Grafenau

    Zeitschriftenartikel

    B. Türk, Michael Scholz, P. Berresheim

    Measuring Service Quality in Online Luxury Goods Retailing

    Journal of Electronic Commerce Research, vol. 13, no. 1, pp. 88-103

    2012

    Abstract anzeigen

    Service quality has been identified as a crucial factor to successfully and sustainably manage online shops. In this paper, we introduce anadaptation oftheE-S-Qualinstrumentto measure service quality in online luxury goods retailing. Based on a literature review,we identify efficiency, design, fulfillment, information, contact and responsiveness as factorsof service quality in online luxury goods retailing. We found empirical evidence that these factors should be considered as dimensions rather than antecedents. A survey conducted in cooperation with the HUGO BOSS AG indicates that our proposed instrument is valid and reliable. Implications for research and practice as well as limitations of our study are discussed.

    NachhaltigEuropan Campus Rottal-Inn

    Vortrag

    Michael Laar

    Proyectos Basados en energías renovables en instituciones educativas

    Taller Cambio climático, sustentabilidad y manejo sustentable del recurso agua, Lima, Perú

    2012

    NachhaltigEuropan Campus Rottal-Inn

    Vortrag

    Michael Laar

    Green Schools, Comfort & Productivity - Experiences in the South American Context

    Summit of American Green Building Councils, Iquitos, Peru

    2012

    NachhaltigEuropan Campus Rottal-Inn

    Vortrag

    Michael Laar

    Escuelas sostenibles en diferentes zonas climáticas – La cooperación alemana y el proyecto ECOLEGIOS en Perú

    1. Congreso Internacional de Arquitectura Sostenible (CIARQ-S 2012), Lima, Perú

    2012

    NachhaltigAngewandte Naturwissenschaften und WirtschaftsingenieurwesenTC Teisnach Sensorik

    Patent

    L. Ross, S. Kufner, Maria Kufner, W. Foß, M. Bock, F. Baetz

    Method for producing an optical splitter cascade and optical assembly

    2012

    Abstract anzeigen

    An optical assembly, which is in particular in the form of a splitter component with a so-called splitter forming a passive optical component, is produced particularly inexpensively. In a first step a plurality of splitters are produced on a common wafer by forming a corresponding conductor track pattern. In a second step optical fibers are coupled simultaneously to the connection sides of the individual splitters with the aid of a connection carrier. Then, in a third step the individual splitters with the connection carriers connected thereto are separated form one another. Only one common coupling operation for a large number of splitters is required. The splitters may then be connected to form a splitter cascade.

    NachhaltigAngewandte Naturwissenschaften und WirtschaftsingenieurwesenTC Weißenburg

    Zeitschriftenartikel

    Altafim, R.A.P., Dmitry Rychkov, Wirges, W., Gerhard, R., Basso, H.C., R.A.C. Altafim, M. Melzer

    Laminated tubular-channel ferroelectret systems from low-density polyethylene films and from fluoroethylene-propylene copolymer films-A comparison

    IEEE Transactions on Dielectrics and Electrical Insulation, vol. 19, no. 4, pp. 1116-1123

    2012

    DOI: 10.1109/TDEI.2012.6259978