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ANNOUNCEMENT – COE MS THESIS DEFENSE

Mr. Mohammad F. Al-Hammouri, Full-Time COE MS student, will defend his MS Thesis on Thursday, November 20, 2014 at 02:20 p.m. in 22-105. His MS thesis title is “SCALABLE UNEQUAL PACKET PRIORITY FOR REAL-TIME WIRELESS VIDEO STREAMING OVER DDS BASED MIDDLE-WARE”. You are cordially invited to attend.

Abstract: Wireless Real-time video transmission becomes an important service and gets attention in last recent year because the breed of different wireless technologies likes mobile networks, WiMAX and Bluetooth.  In this type of transmission the receiver must get video frame after short period (within playback time) to maintain continuous and live video without jerks otherwise delayed packets become useless. Video transmission over wireless needs high capacity and good network condition, whereas wireless networks are unstable and have a variable available capacity over time, these conditions lead to drop and delay packets then several degradation in video quality.  Different techniques has been proposed for efficient real time video streaming over wireless and heterogeneous networks. Adaptive video streaming techniques are used to solve channel capacity and condition variation based on different methods, Crosse layer approaches has been proposed for efficient channel allocation and congestion avoidance, Error control and concealment is used to decrease errors effect on the receiving video. Scalable video coding (SVC) or layer coding has been proposed to achieve graceful degradation for video quality in lossy transmission environments by dropping part of enhancement layers without the need of re-encoding. SVC or layer coding face a problem of unequal layer protection, base layer may (inside sub-stream) be dropped while enhancement layer must be dropped first. Furthermore, whole scalable layer may dropped while there is chance to drop packet by packet which prevents graceful degradation. As A result, application layer solution using a middleware is used to implement scalable video coding which increase networks reliability, flexibility and maintain Quality Of service (QoS) control. In this work, I explore the transmitting of real-time video using new video compression standard: Scalable video coding (SVC) based on DDS middleware over IEEE 802.11, four types of SVC scalability has been used: Temporal, Spatial, Quality and combined scalability. I Use an open source evaluation tool called Scalable Video-streaming Evaluation (SVEF) and include DDs middleware which based on publisher/Subscriber architecture. To assess video performance, we make the use of specific metrics like PSNR (Peak signal to noise ratio) or MOS (Mean Opinion Score), Frames delay and jitter. Experimental results shows a graceful degradation to video quality has been achieved using SVC especially when number of receiver’s increased. Furthermore, Video quality are sensitive to encoding type, SNR performed better results due to best coding efficiency which lead to minimum video encoding size and packet size.

Refreshment (Tea, cold drink, water and cakes) will be served

Dr. Ahmad Almulhem

Chairman, COE Dept.