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Ekmekcioglu E.,University of Surrey | De Silva V.,Apical Ltd. | Pesch P.T.,Institute For Rundfunktechnik Irt | Kondoz A.,Loughborough University
IEEE Journal on Selected Topics in Signal Processing | Year: 2014

Owing to its wide-interoperability, stereoscopic 3D video format in High Definition (HD) is a popular choice for 3D entertainment media distribution. However, the delivery over bandwidth constrained networks exhibits challenges in terms of intermittent congestions in the network traffic, which enforce the delivery system to perform perception-aware coding to save bandwidth. In the scope of stereoscopic 3D video, asymmetric quality adaptation has proved to be an effective method in terms of maintaining the perceived quality while reducing the required transmission bandwidth. On the other hand, Region-Of-Interest (ROI) based coding in accordance with the visual attention cues, which offers non-uniform quality assignment to regions of different saliency levels has not been widely studied in combination with asymmetric coding of stereoscopic 3D video. In this work, the effectiveness of using visual attention aided non-uniform asymmetric 3D video coding is explored. The importance of incorporating compression artefacts in the formulation of visual attention model is also revealed. The discussions in this paper are based on a comprehensive subjective test with 8 stereoscopic video sequences of different spatial and temporal characteristics at different conditions. © 2014 IEEE. Source


Brugger R.,Institute For Rundfunktechnik Irt | Schertz A.,Institute For Rundfunktechnik Irt
EBU Technical Review | Year: 2014

The concept of distributing linear broadcast content via cellular mobile broadband networks has been discussed for several years. Whereas the distribution of mass TV content by means of a unicast mode of mobile broadband systems is still of some restricted usefulness, the introduction of a broadcast mode in cellular 'Long Term Evolution' (LTE) has opened the door for more promising approaches. This operational mode employs the single frequency network (SFN) concept and is called eMBMS (multimedia broadcast multicast service) or MBSFN mode. This article analyses mobile broadband studies dealing with TV distribution via cellular LTE networks for different reception scenarios, uses findings from these studies to evaluate the spectrum efficiency of these approaches and compares them with classical broadcast approaches using DVB-T2. For this purpose a generalized notion of spectral efficiency is derived. This article is based on material partially published and distributed earlier in EBU and CEPT working groups. It also takes into account some additional recently-published studies, which modify some of the previous results. Source


Brugger R.,Institute For Rundfunktechnik Irt | Schertz A.,Institute For Rundfunktechnik Irt
EBU Technical Review | Year: 2014

In a previous article [1], the spectrum consumption of LTE MBSFN and DVB-T2 with their associated different types of network topology for the distribution of linear TV content was investigated, and a comparison of High-Tower-High-Power (HTHP) and Low-Tower-Low-Power (LTLP) network topologies was performed. It was found that significant performance differences exist between these different types of networks. The results of this study form, therefore, an important aspect for the choice of a network topology, since spectrum is a scarce resource which has to be used in a careful and economic manner. Apart from considerations of the spectrum consumption of a transmission system and the choice of a network topology, implementation and running costs of a particular approach are further relevant aspects for a decision on an appropriate terrestrial broadcast delivery system. This article evaluates the cost of an LTLP approach for the distribution of linear TV content, and discusses it in the light of the costs of a traditional HTHP approach. The calculation for the public broadcaster's TV offering in Germany is used as a practical example for this comparison. The study is based on currently available cost information. It can be assumed that the trend of falling prices will lower these costs in the medium to long-term future for both LTLP and HTHP networks. Source

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