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Contributions to QoE management of live IP media.

Vakili, Ahmad (2012). Contributions to QoE management of live IP media. Thèse. Québec, Université du Québec, Institut national de la recherche scientifique, Doctorat en télécommunications, 215 p.

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Increased public access to broadband networks has led to a fast-growing demand for Voice and Video over IP (VVoIP) applications such as Internet telephony (VoIP), video conferencing, and IP television (IPTV). While the evaluation of Video (or Speech) communication systems has been an important field for both academia and industry for decades, the introduction of VVoIP systems has created a new set of issues that require new evaluation methods. Moreover, since we have moved to a unique network for multiple services, it has appeared that traditional QoS measures do not tell a sufficient story and the focus has moved to end user’s perceptual quality. Perceived video quality is affected by distortion caused by the encoder and the network impairments. The effect of these distortions depends on different video specifications such as video content, video resolutions, etc., but these parameters have not been widely used in existing perceptual video quality prediction and management models. The main goal of our research is the development of a control algorithm for perceptual video quality for online video streaming applications. This aim has led to five main contributions as follows: • Investigation and improvement of packet loss probability estimation methods; • Investigation and improvement of One Way Delay (OWD) estimation methods; • Investigation of effects of packet/frame loss on multimedia/video quality according to codec characteristics; • Accurate (subjective) measurement of the perceived quality of videos with different codec characteristics (Quantization parameter and frame-rate). • Investigation of different video bit rate-controlling mechanisms/models to manage the end user’s perceived quality and development of an algorithm to control the perceptual video quality for video conferencing applications

Type de document: Thèse
Directeur de mémoire/thèse: Grégoire, Jean-Charles
Mots-clés libres: VVoIP; video quality; broadband network; internet; qualité vidéo; réseau à large bande
Centre: Centre Énergie Matériaux Télécommunications
Date de dépôt: 09 juill. 2014 20:11
Dernière modification: 16 mars 2016 14:28
URI: http://espace.inrs.ca/id/eprint/2168

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