Çok bakışlı vıdeoların etkileşimli 3-b tv için alıcı güdümlü aktarılması

We present a novel 3-D multi-view video delivery scheme that allows users watch3-D content interactively with significantly reduced bandwidth requirements by trans-mission of small number of views selected according to viewer?s head position. Theproposed scheme can be used for point-to-point delivery to a single user and/or multi-cast delivery to many users. Furthermore, the scheme can transport dense light-field-like multi-view sequences or multi-view sequences together with depth information.In the proposed scheme, the user?s head motion is tracked to select the requiredviews dynamically. The system then allocates more bandwidth to these required viewsto render the user?s current viewing angle. In order to reduce the adverse effectsof delays due to network and stream switching, required view points are predictedand pre-fetched. Highly compressed lower quality views are also sent alongside theselected high quality views to provide protection against stoppage due to erroneousviewpoint predictions. A novel metric based on the abruptness of the head movementsand delays in the system is introduced to help in determining the number of theadditional lower quality views to be transmitted. The proposed system makes useof Multi-View Coding (MVC) and Scalable Video Coding (SVC) concepts togetherto obtain improved compression efficiency while providing flexibility in bandwidthallocation to the selected views. Rate-distortion performance of the proposed systemis reported under different conditions. Use of the introduced metric in determiningthe optimal operating point, i.e., the number of lower quality views that need to betransported, is demonstrated.Overlay multicast is employed to reduce the bandwidth requirements when theproposed scheme is used for transporting 3-D content to several users. An application-layer multicast protocol, called NICE, was modified for this purpose. NICE is chosendue to its lower control overhead and short join-latency when compared to other1application-layer multicast protocols; reducing the network delay for the proposedselective multi-view video delivery system.2