Wael Chérif

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Dynamic Adaptive Streaming over HTTP (DASH) is broadly deployed on the Internet for live and on-demand video streaming services. Recently, a new version of HTTP was proposed, named HTTP/2. One of the objectives of HTTP/2 is to improve the end-user perceived latency compared to HTTP/1.1. HTTP/2 introduces the possibility for the server to push resources to(More)
In this paper, we present a variational framework for joint disparity and motion estimation in a sequence of stereo images. The problem involves the estimation of four dense fields: two motion fields and two disparity fields. In order to reduce computational complexity and improve estimation accuracy, the two motion fields, for the left and right sequences,(More)
Quality of Experience (QoE) is the key criteria for evaluating the Media Services. Unlike objective Quality of Service (QoS) metrics, QoE is more accurate to reflect the user experience as it considers human visual system and its complex behavior towards distortions in the displayed video sequence. In this paper, we present a new QoE tool solution, named(More)
Scalable Video Coding (SVC) in media streaming enables dynamic adaptation based on device capabilities and network conditions. In this paper, we investigate deployment options of SVC for Dynamic Adaptive Streaming over HTTP (DASH) with a special focus on scalability options, which are relevant for dynamic adaptation, especially in wireless and mobile(More)
Perceived speech quality, or Quality of Experience (QoE), is the key criteria for evaluating VoIP service. Most of the existing solutions are intrusive, in a sense where they require both the original and the transmitted audio sequences. These solutions give good estimation of the QoE, but they cannot be used in real-time. In fact, Service Provider and(More)
Scalability within media coding allows for content adaptation towards heterogeneous user contexts and enables in-network adaptation. However, there is no straightforward solution how to encode the content in a scalable way while maximizing rate-distortion performance. In this paper we provide encoding guidelines for scalable video coding based on a survey(More)
Wi-Fi Direct is a new protocol that standardizes the direct communication between Wi-Fi enabled mobile devices without requiring an access point. The specification proposes enhanced peer-to-peer functions to be supported by the mobile devices. A P2P device becomes a group owner for a set of client devices forming a P2P Group. All devices in the P2P Group(More)
Scalable video coding (SVC) is considered as a promising video format for multimedia applications. It provides scalability in three-dimensional space: spatial scalability (picture size), temporal scalability (frame rate), and SNR/Quality scalability. The scalability is achieved by introducing a layered encoding of the bit-stream. The aim of the scalability(More)