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364 results on '"Skorin-kapov, Lea"'

5. QUALINET White Paper on Definitions of Immersive Media Experience (IMEx)

Author

Perkis, Andrew, Timmerer, Christian, Baraković, Sabina, Husić, Jasmina Baraković, Bech, Søren, Bosse, Sebastian, Botev, Jean, Brunnström, Kjell, Cruz, Luis, De Moor, Katrien, Saibanti, Andrea de Polo, Durnez, Wouter, Egger-Lampl, Sebastian, Engelke, Ulrich, Falk, Tiago H., Gutiérrez, Jesús, Hameed, Asim, Hines, Andrew, Kojic, Tanja, Kukolj, Dragan, Liotou, Eirini, Milovanovic, Dragorad, Möller, Sebastian, Murray, Niall, Naderi, Babak, Pereira, Manuela, Perry, Stuart, Pinheiro, Antonio, Pinilla, Andres, Raake, Alexander, Agrawal, Sarvesh Rajesh, Reiter, Ulrich, Rodrigues, Rafael, Schatz, Raimund, Schelkens, Peter, Schmidt, Steven, Sabet, Saeed Shafiee, Singla, Ashutosh, Skorin-Kapov, Lea, Suznjevic, Mirko, Uhrig, Stefan, Vlahović, Sara, Voigt-Antons, Jan-Niklas, and Zadtootaghaj, Saman

Subjects
Computer Science - Multimedia
Abstract

With the coming of age of virtual/augmented reality and interactive media, numerous definitions, frameworks, and models of immersion have emerged across different fields ranging from computer graphics to literary works. Immersion is oftentimes used interchangeably with presence as both concepts are closely related. However, there are noticeable interdisciplinary differences regarding definitions, scope, and constituents that are required to be addressed so that a coherent understanding of the concepts can be achieved. Such consensus is vital for paving the directionality of the future of immersive media experiences (IMEx) and all related matters. The aim of this white paper is to provide a survey of definitions of immersion and presence which leads to a definition of immersive media experience (IMEx). The Quality of Experience (QoE) for immersive media is described by establishing a relationship between the concepts of QoE and IMEx followed by application areas of immersive media experience. Influencing factors on immersive media experience are elaborated as well as the assessment of immersive media experience. Finally, standardization activities related to IMEx are highlighted and the white paper is concluded with an outlook related to future developments.

Published
2020

6. From QoS Distributions to QoE Distributions: a System's Perspective

Author

Hossfeld, Tobias, Heegaard, Poul E., Varela, Martin, Skorin-Kapov, Lea, and Fiedler, Markus

Subjects
Computer Science - Multimedia, Computer Science - Networking and Internet Architecture
Abstract

In the context of QoE management, network and service providers commonly rely on models that map system QoS conditions (e.g., system response time, paket loss, etc.) to estimated end user QoE values. Observable QoS conditions in the system may be assumed to follow a certain distribution, meaning that different end users will experience different conditions. On the other hand, drawing from the results of subjective user studies, we know that user diversity leads to distributions of user scores for any given test conditions (in this case referring to the QoS parameters of interest). Our previous studies have shown that to correctly derive various QoE metrics (e.g., Mean Opinion Score (MOS), quantiles, probability of users rating "good or better", etc.) in a system under given conditions, there is a need to consider rating distributions obtained from user studies, which are often times not available. In this paper we extend these findings to show how to approximate user rating distributions given a QoS-to-MOS mapping function and second order statistics. Such a user rating distribution may then be combined with a QoS distribution observed in a system to finally derive corresponding distributions of QoE scores. We provide two examples to illustrate this process: 1) analytical results using a Web QoE model relating waiting times to QoE, and 2) numerical results using measurements relating packet losses to video stall pattern, which are in turn mapped to QoE estimates. The results in this paper provide a solution to the problem of understanding the QoE distribution in a system, in cases where the necessary data is not directly available in the form of models going beyond the MOS, or where the full details of subjective experiments are not available., Comment: 4th International Workshop on Quality of Experience Management (QoE Management 2020), featured by IEEE Conference on Network Softwarization (IEEE NetSoft 2020), Ghent, Belgium

Published
2020

8. Confidence Interval Estimators for MOS Values

Author

Hossfeld, Tobias, Heegaard, Poul E., Varela, Martin, and Skorin-Kapov, Lea

Subjects
Statistics - Methodology, Computer Science - Human-Computer Interaction, Computer Science - Multimedia, Computer Science - Performance
Abstract

For the quantification of QoE, subjects often provide individual rating scores on certain rating scales which are then aggregated into Mean Opinion Scores (MOS). From the observed sample data, the expected value is to be estimated. While the sample average only provides a point estimator, confidence intervals (CI) are an interval estimate which contains the desired expected value with a given confidence level. In subjective studies, the number of subjects performing the test is typically small, especially in lab environments. The used rating scales are bounded and often discrete like the 5-point ACR rating scale. Therefore, we review statistical approaches in the literature for their applicability in the QoE domain for MOS interval estimation (instead of having only a point estimator, which is the MOS). We provide a conservative estimator based on the SOS hypothesis and binomial distributions and compare its performance (CI width, outlier ratio of CI violating the rating scale bounds) and coverage probability with well known CI estimators. We show that the provided CI estimator works very well in practice for MOS interval estimators, while the commonly used studentized CIs suffer from a positive outlier ratio, i.e., CIs beyond the bounds of the rating scale. As an alternative, bootstrapping, i.e., random sampling of the subjective ratings with replacement, is an efficient CI estimator leading to typically smaller CIs, but lower coverage than the proposed estimator.

Published
2018

9. The Impact of QoE Factors on the Perception of Constructs Comprising Information Quality, Usability, and Aesthetics in Mobile Web Browsing.

Author

Baraković, Sabina, Skorin-Kapov, Lea, and Husić, Jasmina Baraković

Subjects
*WEB browsing, *EVIDENCE gaps, *WEB designers, *RESEARCH questions, *WEBSITES
Abstract

Quality of Experience (QoE) for mobile Web browsing is a complex and multidimensional concept. So far, the research community has addressed the influence of QoE perceptual dimensions on QoE and the impact of various influence factors on QoE perceptual dimensions for mobile Web browsing. In this study, we recognize the gap and need to analyze and gain a deeper understanding of the relationship between multiple influence factors and specific constructs of QoE perceptual dimensions. Utilizing a previously collected dataset, our goal is to fill the research gap in terms of investigating the impact of specific influence factors (loading time, aesthetics, number of taps, information quality) on various constructs comprising the user perception of usability, aesthetics, and information quality in the context of mobile Web browsing. A total of 14 research questions are raised: 7 addressing constructs comprising perceived usability (simplicity, effectiveness, quickness, efficiency, comfort, ease of use, organization), 3 addressing constructs comprising perceived aesthetics (perception of mobile Web site aesthetics, pleasance, clarity, systematicness), and 4 addressing constructs comprising perceived information quality (timeliness, clarity, conciseness, structuralism/completeness/spelling-correctness). Results of posed research questions provide indications on the strength and direction of the impact of considered QoE influence factors on the perception of studied constructs. This study contributes to the research community by being the first to address the impact of chosen QoE influence factors on individual constructs comprising QoE perceptual dimensions in the domain of mobile Web browsing, thus extending the knowledge on interplays and relations in this area. Furthermore, it contributes by revealing numerous new paradigms in the context of usability, aesthetics, and quality of information, such as: (i) beautiful and easy to reach is more simple, effective, efficient, and comfortable, (ii) easy to reach is more pleasant and clear, (iii) informative is more pleasant and clear, (iv) beautifully presented information has higher perceived quality, etc. Reported findings can be utilized by various stakeholders (mobile Web site designers, content providers, device designers, network providers) for indirect management of QoE. [ABSTRACT FROM AUTHOR]

Published
2024
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10. Exploring the Facets of the Multiplayer VR Gaming Experience.

Author

Vlahovic, Sara, Slivar, Ivan, Silic, Matko, Skorin-kapov, Lea, and Suznjevic, Mirko

Subjects
MULTIPLAYER games, USER experience, RESEARCH personnel, SOCIAL reality, SOCIAL interaction
Abstract

While the topic of investigating user experience with immersive services, such as Social Virtual Reality (VR), is starting to gain traction in the research community, the unique case of multiplayer VR games requires a more specific approach. Attempts to investigate user experiences with this complex, multidimensional service are hindered by the absence of specific standards and guidelines going beyond what we know about non-immersive gaming. In this article, we present the results of a user study (N = 32) exploring participants' experience of playing two competitive VR games of different genres (shooter, sports game), as we focus on three distinct facets of multiplayer VR gaming—network, interpersonal competitiveness, and social interaction. Furthermore, approaching the issue from the perspective of Quality of Experience researchers looking to conduct future user studies on the topic, we also present our findings as a way to shed light on factors that need further consideration, especially in the context of participant recruitment and methodology design, such as the choice of access network to be used for testing, and the issue of matchmaking study participants based on skill and prior relationship. [ABSTRACT FROM AUTHOR]

Published
2024
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11. The Impact of Packet Loss and Google Congestion Control on QoE for WebRTC-Based Mobile Multiparty Audiovisual Telemeetings

Author

Vucic, Dunja, Skorin-Kapov, Lea, Hutchison, David, Series Editor, Kanade, Takeo, Series Editor, Kittler, Josef, Series Editor, Kleinberg, Jon M., Series Editor, Mattern, Friedemann, Series Editor, Mitchell, John C., Series Editor, Naor, Moni, Series Editor, Pandu Rangan, C., Series Editor, Steffen, Bernhard, Series Editor, Terzopoulos, Demetri, Series Editor, Tygar, Doug, Series Editor, Kompatsiaris, Ioannis, editor, Huet, Benoit, editor, Mezaris, Vasileios, editor, Gurrin, Cathal, editor, Cheng, Wen-Huang, editor, and Vrochidis, Stefanos, editor

Published
2019
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12. QoE Management for Future Networks

Author

Schatz, Raimund, Schwarzmann, Susanna, Zinner, Thomas, Dobrijevic, Ognjen, Liotou, Eirini, Pocta, Peter, Barakovic, Sabina, Barakovic Husic, Jasmina, Skorin-Kapov, Lea, Hutchison, David, Series Editor, Kanade, Takeo, Series Editor, Kittler, Josef, Series Editor, Kleinberg, Jon M., Series Editor, Mattern, Friedemann, Series Editor, Mitchell, John C., Series Editor, Naor, Moni, Series Editor, Pandu Rangan, C., Series Editor, Steffen, Bernhard, Series Editor, Terzopoulos, Demetri, Series Editor, Tygar, Doug, Series Editor, Weikum, Gerhard, Series Editor, Ganchev, Ivan, editor, van der Mei, R. D., editor, and van den Berg, Hans, editor

Published
2018
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13. Context Monitoring for Improved System Performance and QoE

Author

Metzger, Florian, Hoßfeld, Tobias, Skorin-Kapov, Lea, Haddad, Yoram, Liotou, Eirini, Pocta, Peter, Melvin, Hugh, Siris, Vasilios A., Zgank, Andrej, Jarschel, Michael, Hutchison, David, Series Editor, Kanade, Takeo, Series Editor, Kittler, Josef, Series Editor, Kleinberg, Jon M., Series Editor, Mattern, Friedemann, Series Editor, Mitchell, John C., Series Editor, Naor, Moni, Series Editor, Pandu Rangan, C., Series Editor, Steffen, Bernhard, Series Editor, Terzopoulos, Demetri, Series Editor, Tygar, Doug, Series Editor, Weikum, Gerhard, Series Editor, Ganchev, Ivan, editor, van der Mei, R. D., editor, and van den Berg, Hans, editor

Published
2018
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14. Lag Compensation for First-Person Shooter Games in Cloud Gaming

Author

Li, Zhi, Melvin, Hugh, Bruzgiene, Rasa, Pocta, Peter, Skorin-Kapov, Lea, Zgank, Andrej, Hutchison, David, Series Editor, Kanade, Takeo, Series Editor, Kittler, Josef, Series Editor, Kleinberg, Jon M., Series Editor, Mattern, Friedemann, Series Editor, Mitchell, John C., Series Editor, Naor, Moni, Series Editor, Pandu Rangan, C., Series Editor, Steffen, Bernhard, Series Editor, Terzopoulos, Demetri, Series Editor, Tygar, Doug, Series Editor, Weikum, Gerhard, Series Editor, Ganchev, Ivan, editor, van der Mei, R. D., editor, and van den Berg, Hans, editor

Published
2018
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15. QoE Analysis of the Setup of Different Internet Services for FIFO Server Systems

Author

Hoßfeld, Tobias, Varela, Martín, Heegaard, Poul E., Skorin-Kapov, Lea, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Weikum, Gerhard, Series editor, German, Reinhard, editor, Hielscher, Kai-Steffen, editor, and Krieger, Udo R., editor

Published
2018
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21. The OpenIoT Approach to Sensor Mobility with Quality-Driven Data Acquisition Management

Author

Žarko, Ivana Podnar, Antonić, Aleksandar, Marjanović, Martina, Pripužić, Krešimir, Skorin-Kapov, Lea, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Weikum, Gerhard, Series editor, Podnar Žarko, Ivana, editor, Pripužić, Krešimir, editor, and Serrano, Martin, editor

Published
2015
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22. OpenIoT: Open Source Internet-of-Things in the Cloud

Author

Soldatos, John, Kefalakis, Nikos, Hauswirth, Manfred, Serrano, Martin, Calbimonte, Jean-Paul, Riahi, Mehdi, Aberer, Karl, Jayaraman, Prem Prakash, Zaslavsky, Arkady, Žarko, Ivana Podnar, Skorin-Kapov, Lea, Herzog, Reinhard, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Weikum, Gerhard, Series editor, Podnar Žarko, Ivana, editor, Pripužić, Krešimir, editor, and Serrano, Martin, editor

Published
2015
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29. Q-POINT: QoE-Driven Path Optimization Model for Multimedia Services

Author

Dobrijevic, Ognjen, Kassler, Andreas J., Skorin-Kapov, Lea, Matijasevic, Maja, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Kobsa, Alfred, Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Nierstrasz, Oscar, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Weikum, Gerhard, Series editor, Mellouk, Abdelhamid, editor, Fowler, Scott, editor, Hoceini, Saïd, editor, and Daachi, Boubaker, editor

Published
2014
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34. Approaches for Utility-Based QoE-Driven Optimization of Network Resource Allocation for Multimedia Services

Author

Skorin-Kapov, Lea, Ivesic, Krunoslav, Aristomenopoulos, Giorgos, Papavassiliou, Symeon, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Biersack, Ernst, editor, Callegari, Christian, editor, and Matijasevic, Maja, editor

Published
2013
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36. Agent-Based Framework for Personalized Service Provisioning in Converged IP Networks

Author

Podobnik, Vedran, Matijasevic, Maja, Lovrek, Ignac, Skorin-Kapov, Lea, Desic, Sasa, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Kowalczyk, Ryszard, editor, Vo, Quoc Bao, editor, Maamar, Zakaria, editor, and Huhns, Michael, editor

Published
2009
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37. Modeling of a QoS Matching and Optimization Function for Multimedia Services in the NGN

Author

Skorin-Kapov, Lea, Matijasevic, Maja, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Nierstrasz, Oscar, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Sudan, Madhu, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Vardi, Moshe Y., Series editor, Weikum, Gerhard, Series editor, Pfeifer, Tom, editor, and Bellavista, Paolo, editor

Published
2009
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40. Location Conveyance in the IP Multimedia Subsystem

Author

Mosmondor, Miran, Skorin-Kapov, Lea, Filjar, Renato, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Nierstrasz, Oscar, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Sudan, Madhu, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Dough, Series editor, Vardi, Moshe Y., Series editor, Weikum, Gerhard, Series editor, Koucheryavy, Yevgeni, editor, Harju, Jarmo, editor, and Iversen, Villy B., editor

Published
2006
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41. End-to-End QoS Signaling for Future Multimedia Services in the NGN

Author

Skorin-Kapov, Lea, Matijasevic, Maja, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Nierstrasz, Oscar, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Sudan, Madhu, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Dough, Series editor, Vardi, Moshe Y., Series editor, Weikum, Gerhard, Series editor, Koucheryavy, Yevgeni, editor, Harju, Jarmo, editor, and Iversen, Villy B., editor

Published
2006
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42. Interactive Visualization of Grid Monitoring Data on Multiple Client Platforms

Author

Skorin-Kapov, Lea, Pandžić, Igor, Matijašević, Maja, Komerički, Hrvoje, Mošmondor, Miran, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Sloot, Peter M. A., editor, Hoekstra, Alfons G., editor, Priol, Thierry, editor, Reinefeld, Alexander, editor, and Bubak, Marian, editor

Published
2005
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46. CGD

Author

Slivar, Ivan, Bacic, Kresimir, Orsolic, Irena, Skorin-Kapov, Lea, and Suznjevic, Mirko

Subjects
Cloud gaming, Gameplay, Raw video, Dataset, Video metrics, Network traffic, User input
Abstract

With advances in network capabilities, the gaming industry is increasingly turning towards offering "gaming on demand" solutions, with cloud gaming services such as Sony PlayStation Now, Google Stadia, and NVIDIA GeForce NOW expanding their market offerings. Similar to adaptive video streaming services, cloud gaming services typically adapt the quality of game streams (e.g., bitrate, resolution, frame rate) in accordance with current network conditions. To select the most appropriate video encoding parameters given certain conditions, it is important to understand their impact on Quality of Experience (QoE). On the other hand, network operators are interested in understanding the relationships between parameters measurable in the network and cloud gaming QoE, to be able to invoke QoE-aware network management mechanisms. To encourage developments in these areas, comprehensive datasets are crucial, including both network and application layer data. This paper presents CGD, a dataset consisting of 600 game streaming sessions corresponding to 10 games of different genres being played and streamed using the following encoding parameters: bitrate (5, 10, 20 Mbps), resolution (720p, 1080p), and frame rate (30, 60 fps). For every combination repeated five times for each game, the dataset includes: 1) gameplay video recordings, 2) network traffic traces, 3) user input logs (mouse and keyboard), and 4) streaming performance logs.

Published
2022
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