Christos Tselios

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Three Dimensional video quality comprises a variety of perceptual attributes, including overall image quality, naturalness, presence, perceived depth, comfort, immersiveness, etc. This paper proposes a novel objective QoE model for 3D video streaming that takes into account network parameters (i.e. packet losses)and is based on the relationship between(More)
Scalable video enables flexible video delivery over IP networks. The adaptation of the video content to the network configuration and the networking conditions is the great advantage of scalable video. In this research work, on-demand H.264 SVC video delivery over wireless multi-hop single-frequency networks is studied. The main objective is to achieve the(More)
The advent of 5G Networks introduces significant challenges in almost every link of the network value chain. The demand for seamless connectivity, extremely low latency, high-speed data transfer and energy efficiency along with the exponential increase of interconnected devices will shape an ecosystem with such complexity that enforces the replacement of(More)
This paper aims to identify open challenges and propose the future steps towards establishing QoE driven media aware clouds. Cloud computing emerges as technology that allows access to resources over the Internet, transparently and independently of the underlying infrastructure. This study identifies the research challenges that future media-aware cloud(More)
This paper describes the ROMEO architecture for live 3D multi-view video delivery over peer-to-peer networks. The scope of the European founded Integration Project ROMEO encompasses addressing the challenges of live multiview video delivery over heterogeneous networks (WiFi, LTE, DVB, etc.) and diverse user equipment (mobile, portable, fixed). In order to(More)
This article presents a novel, end-to-end, quality-aware optimization framework for multimedia clouds, where path selection mechanisms are exploited in conjunction with media optimization in order to support multimedia delivery in a quality-aware manner. As wireless data traffic worldwide is characterized by exponential growth, with the most prominent part(More)
P2PSIP is a protocol for managing multimedia sessions in a distributed architecture, where all participating nodes share and manage network resources like bandwidth and disk space. This paper presents threats associated with P2PSIP protocol and proposes protocol enhancement to mitigate possible attacks. These extensions have been designed for the leading(More)
This paper proposes a novel architecture that integrates Media Independent Handover (MIH) 802.21 framework and IP Multimedia Subsystem (IMS) functionalities in order to support multimedia services across intertechnology Radio Access Networks (RANs) in a secure and seamless manner. MIH framework is responsible for deciding and triggering a handoff based on(More)