TU Berlin

Quality and Usability LabBenjamin Belmudez

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Benjamin Belmudez


Research Field

Audiovisual quality

Research Topics

Multimodal Quality Assessment on Videoconferencing


Benjamin was born in France in 1983. He first studied general Mathematics and Physics in Toulouse. Then he joined the National School of Higher Education in Physics of Strasbourg (Engineering school) and specialized in Video and Image Processing. He carried out his master's degree within the INRIA in cooperation with the LIAMA (Beijing) on "Structural Change Detectection on Satellite Images using Conditional Mixed States Markovian Model". In 2007, he started a Phd within the Deutsche Telekom Laboratories and the Technical University of  Berlin.

Address Quality and Usability Lab
Deutsche Telekom Laboratories
TU Berlin
Ernst-Reuter-Platz 7
D-10587 Berlin, Germany Tel:  +49 30 8353 58233


Contributions to Teaching

  • Exercises “Usability Engineering”, Technical University Berlin, 2008-2009


Video Quality in Next Generation Mobile Networks - Perception of Time-Varying Transmission
Zitatschlüssel lewcio2011b
Autor Lewcio, Blazej and Belmudez, Benjamin and Mehmood, Amir and Wältermann, Marcel and Möller, Sebastian
Buchtitel IEEE International Workshop on Communications Quality and Reliability (CQR 2011)
Seiten 1–6
Jahr 2011
ISBN 978-1-4577-1297-5
DOI 10.1109/CQR.2011.5996089
Ort Naples, USA
Adresse Naples, USA
Monat 10.-12. May
Verlag IEEE
Wie herausgegeben full
Zusammenfassung Next Generation Mobile Networks (NGMNs) provide an all-IP wireless platform for multimedia service delivery. The integrated communication system creates new perspectives for wireless video distribution and quality provisioning. Depending on the mobility patterns of the nomadic users, the link layer characteristics may rapidly change. Furthermore, mobility and service adaptation events like network handovers, video bit rate switching, or codec changeovers, may affect the user perception. Provisioning ``always best connected'' video services requires a thorough knowledge of video quality perception in NGMNs. In this paper, we address this problem. A subjective test including 50 NGMN conditions has been carried out. They were arranged in groups to assess the impact on perceived quality of 1) the access technology and network handover, 2) video codecs and codec changeover, 3) video bit rate and bit rate switching, and 4) to provide guidelines for packet loss adaptation. We could identify the perceptual bottlenecks of the future wireless communication and are able to propose perceptual guidelines for mobility management. In this way, this paper contributes to the service quality improvement of future wireless communications.
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