Katmanlı video ile eşler arası çok noktalı video konferans

A new peer-to-peer architecture for multipoint video conferencing using layered video coding with two layers at the end hosts is presented. The system targets end points with low bandwidth network connections (single video in and out) and enables them to create a multipoint conference without any additional networking and computing resources than what is needed for a point-to-point conference. In contrast to prior work, it allows each conference participant to see any other participant at any given time under all multipoint configurations of any number of users, with a caveat that some participants may have to receive only the base layer video. Layered video encoding techniques usable within this architecture are described. A protocol for the peer-to-peer video transmission approach has been developed and simulated. Its performance is analyzed. A prototype has been implemented and successfully deployed. The effects of upload bandwidths that can support multiple video signals are investigated. Furthermore, a multi-objective optimization approach to minimize the number of base layer receivers, to minimize the delay experienced by the peers and to maximize the granted additional requests to support peers having multiple input bandwidths has been developed. A technique assigning importance weights to each of the objectives is proposed and explained. The use of the proposed multiobjective optimization scheme is demonstrated through example scenarios. The system has been fully specified and verified. To ensure secure transmission of video, a scheme providing authentication, integrity and non-repudiation is presented and its effectiveness is shown through simulations.