Luận văn Rate-Distortion analysis and traffic modeling of scalable video coders

In this work, we focus on two important goals of the transmission of scalable video over the Internet. The ¯rst goal is to provide high quality video to end users and the second one is to properly design networks and predict network performance for video transmission based on the characteristics of existing video tra±c. Rate-distortion (R-D) based schemes are often applied to improve and stabilize video quality; how-ever, the lack of R-D modeling of scalable coders limits their applications in scalable streaming. Thus, in the ¯rst part of this work, we analyze R-D curves of scalable video coders and propose a novel operational R-D model. We evaluate and demonstrate the accuracy of our R-D function in various scalable coders, such as Fine Granular Scalable (FGS) and Progressive FGS coders. Furthermore, due to the time-constraint nature of Internet streaming, we propose another operational R-D model, which is accurate yet with low computational cost, and apply it to streaming applications for quality control purposes. The Internet is a changing environment; however, most quality control approaches only consider constant bit rate (CBR) channels and no speci¯c studies have been con-ducted for quality control in variable bit rate (VBR) channels. To ¯ll this void, we examine an asymptotically stable congestion control mechanism and combine it with our R-D model to present smooth visual quality to end users under various network conditions. Our second focus in this work concerns the modeling and analysis of video tra±c, which is crucial to protocol design and e±cient network utilization for video trans-mission. Although scalable video tra±c is expected to be an important source for the Internet, we ¯nd that little work has been done on analyzing or modeling it. In this regard, we develop a frame-level hybrid framework for modeling multi-layer VBR video tra±c. In the proposed framework, the base layer is modeled using a combi-nation of wavelet and time-domain methods and the enhancement layer is linearly predicted from the base layer using the cross-layer correlation.

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  • Từ ngày 01/05/2022

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