Veröffentlichungen des Fachgebiets Audiovisuelle Technik

Die folgende Liste (automatisch durch die Universitätsbibliothek erstellt) enthält die Publikationen ab dem Jahr 2016. Die Veröffentlichungen bis zum Jahr 2015 finden sie auf einer extra Seite.

Hinweis: Wenn Sie alle Publikationen durchsuchen wollen, dann wählen Sie "Alle anzeigen" und können dann die Browser-Suche mit Strg+F verwenden.

Anzahl der Treffer: 161
Erstellt: Thu, 28 Mar 2024 23:02:55 +0100 in 0.0469 sec


Fremerey, Stephan; Hofmeyer, Frank; Göring, Steve; Raake, Alexander
Impact of various motion interpolation algorithms on 360˚ video QoE. - In: 2019 Eleventh International Conference on Quality of Multimedia Experience (QoMEX), (2019), insges. 3 S.

https://doi.org/10.1109/QoMEX.2019.8743307
Göring, Steve; Ramachandra Rao, Rakesh Rao; Raake, Alexander
nofu - a lightweight no-reference pixel based video quality model for gaming content. - In: 2019 Eleventh International Conference on Quality of Multimedia Experience (QoMEX), (2019), insges. 6 S.

https://doi.org/10.1109/QoMEX.2019.8743262
Göring, Steve; Raake, Alexander
deimeq - a deep neural network based hybrid no-reference image quality model. - In: Proceedings of the 2018 7th European Workshop on Visual Information Processing (EUVIP), (2018), insges. 6 S.

https://doi.org/10.1109/EUVIP.2018.8611703
Lebreton, Pierre; Fremerey, Stephan; Raake, Alexander
V-BMS360: a video extention to the BMS360 image saliency model. - In: 2018 IEEE International Conference on Multimedia and Expo workshops (ICMEW), ISBN 978-1-5386-4195-8, (2018), insges. 4 S.

https://doi.org/10.1109/ICMEW.2018.8551523
Göring, Steve; Skowronek, Janto; Raake, Alexander
DeViQ - a deep no reference video quality model. - In: Electronic imaging, ISSN 2470-1173, Bd. 30 (2018), 14, art00017, S. 518-1-518-6

When enjoying video streaming services, users expect high video quality in various situations, including mobile phone connections with low bandwidths. Furthermore, the user's interest in consuming new large-size data content, such as high resolution/frame rate material or 360 degree videos, is gaining as well. To deal with such challenges, modern encoders adaptively reduce the size of the transmitted data. This in turn requires automated video quality monitoring solutions to ensure a sufficient quality of the material delivered. We present a no-reference video quality model; a model that does not require the original reference material, which is convenient for application in the field. Our approach uses a pretrained classification DNN in combination with hierarchical sub-image creation, some state-of-the-art features and a random forest model. Furthermore, the model can process UHD content and is trained on a large ground-truth data set, which is generated using a state-of-the-art full-reference model. The proposed model achieved a high quality prediction accuracy, comparable to a number of full-reference metrics. Thus our model is a proof-of-concept for a successful no-reference video quality estimation.



https://doi.org/10.2352/ISSN.2470-1173.2018.14.HVEI-518
Singla, Ashutosh; Robitza, Werner; Raake, Alexander
Comparison of subjective quality evaluation methods for omnidirectional videos with DSIS and modified ACR. - In: Electronic imaging, ISSN 2470-1173, Bd. 30 (2018), 14, art00025, S. 525-1-525-6

In this paper, we compare the Double-Stimulus Impairment Scale (DSIS) and a Modified Absolute Category Rating (M-ACR) subjective quality evaluation method for HEVC/H.265-encoded omnidirectional videos. These two methods differ in the type of rating scale and presentation of stimuli. Results of our test provide insight into the similarities and differences between these two subjective test methods. Also, we investigate whether the results obtained with these subjective test methods are content-dependent. We evaluated subjective quality on an Oculus Rift for two different resolutions (4K and FHD) and at five different bit-rates. Experimental results show that for 4K resolution, for the lower bit-rates at 1 and 2 MBit/s, M-ACR provides slightly higher MOS compared to DSIS. For 4, 8, 15 MBit/s, DSIS provides slightly higher MOS. While the correlation coefficient between these two methods is very high, M-ACR offers a higher statistical reliability than DSIS. We also compared simulator sickness scores and viewing behavior. Experimental results show that subjects are more prone to simulator sickness while evaluating 360˚ videos with the DSIS method.



https://doi.org/10.2352/ISSN.2470-1173.2018.14.HVEI-525
Berndtsson, Gunilla; Schmitt, Marwin; Hughes, Peter; Skowronek, Janto; Schoenenberg, Katrin; Raake, Alexander
Methods for human-centered evaluation of mediasync in real-time communication. - In: MediaSync, (2018), S. 229-270

In an ideal world people interacting using real-time multimedia links experience perfectly synchronized media, and there is no latency of transmission: the interlocutors would hear and see each other with no delay. Methods to achieve the former are discussed in other chapters in this book, but for a variety of practical and physical reasons, delay-free communication will never be possible. In some cases, the delay will be very obvious since it will be possible to observe the reaction time of the listeners modified by the delay, or there may be some acoustic echo from the listeners' audio equipment. However, in the absence of echo, the users themselves do not always explicitly notice the presence of delay, even for quite large values. Typically, they notice something is wrong (for example "we kept interrupting each other!"), but are unable to define what it is. Some useful insights into the impact of delay on a conversation can be obtained from the linguistic discipline of Conversation Analysis, and especially the analysis of "turn-taking" in a conversation. This chapter gives an overview of the challenges in evaluating media synchronicity in real-time communications, outlining appropriate tasks and methods for subjective testing and how in-depth analysis of such tests can be performed to gain a deep understanding of the effects of delay. The insights are based on recent studies of audio and audiovisual communication, but also show examples from other media synchronization applications like networked music interaction.



https://doi.org/10.1007/978-3-319-65840-7_9
Asan, Avsar; Robitza, Werner; Mkwawa, Is-haka; Sun, Lingfen; Begen, Ali C.
Optimum encoding approaches on video resolution changes: a comparative study. - In: 2018 IEEE International Conference on Image Processing, ISBN 978-1-4799-7061-2, (2018), S. 1003-1007

https://doi.org/10.1109/ICIP.2018.8451635
Robitza, Werner; Kittur, Dhananjaya G.; Dethof, Alexander M.; Göring, Steve; Feiten, Bernhard; Raake, Alexander
Measuring YouTube QoE with ITU-T P.1203 under constrained bandwidth conditions. - In: 2018 Tenth International Conference on Quality of Multimedia Experience (QoMEX), ISBN 978-1-5386-2605-4, (2018), insges. 6 S.

https://doi.org/10.1109/QoMEX.2018.8463363