Research On Scalable Video Coding, Transmission Theory And Application

The development of scalable video coding technology has brought new opportunities forvideo applications which are based on network transmission. With the continuous expansionof network scale and diversity of service provided in the network, the inherent heterogeneityof network becomes more prominent, at the same time more and more devices withdifferent hardware and software configuration join in the network, all of these bring greatchallenges to the traditional video transmission system, in this situation, the scalable videocoding scheme(SVC),in which the generated bit stream can be divided into base layer andenhancement layers, get the attention of many scholars at home and abroad.With SVC scheme,the appropriate multimedia data can be selected according to the network condition anddevice configuration, hence SVC can provide the ability to adapt to different machines andnetworks. In this thesis, firstly the problems of current video transmission system areanalyzed, then we study the SVC technology, stereo video coding technology, rate controltechnology and bandwidth measurement technology, at last the solution of the faced problemare given. The main innovations of this paper are summarized as follows.1. A full-scalable video coding system is realized, in the system, video can behierarchically coded in temporal, spatial and fidelity domain, at the same time, weuse average motion vectors to determine the movement of a video sequence, andthen adopt the suitable GOP structure to improve the coding efficiency.2. Scalable stereo video coding scheme based on H.264/MVC is proposed, the schemetakes full consideration of the binocular suppression theory, encodes the left view ofa stereoscopic video in single-layer, and the right view in multi-layers, generatesscalable stereoscopic bit stream, meanwhile maintains stereoscopic perception asgood as possible.3. Novel bit stream extraction strategy which is suitable for H.264/SVC is presented,the strategy calculates a weighting coefficient for each bit stream slice according toits temporal level and the contained DCT coefficients, then selects a particular combination of bit stream according to the weighting coefficient and target bit rate,Experimental results show that the proposed scheme can achieve qualityimprovement compared with the existing JSVM basic extractor,especially in highbit-rate situation.4. A fast and accurate available bandwidth measurement and prediction scheme isproposed, the scheme gets the available network bandwidth by measuring the timethat a piece of media data transmitted from server to client, then predicts theavailable bandwidth in the next moment according to the normal distributionprediction model, Experimental results show that the proposed scheme predictsavailable bandwidth quickly and accurately, and meanwhile has no influence on thetransmission of streaming media.5. Video sharing solution in home M2M networks is proposed. The solution is based onSVC, adopts home gateway as the home management center, and the availablebandwidth prediction scheme proposed in chapter5is employed to get the currentavailable bandwidth, the presented multimedia sharing system can effectively solvethe problems bring by various terminals and heterogeneous networks, and realize thesmooth sharing of multimedia in home M2M networks.