Due to the combination of PFGS layered coding and Turbo coding with the overall multimedia transmission, the simulation results demonstrated that the algorithm was simple, efficient, accurate, and suitable for various wireless transmission environment.
This paper investigates all kinds of hierarchical layer structures including media object's semantic expression with hierarchical layer structure, scalable coding, MPEG-4's hierarchical bitstreams organization and delivery multimedia integration framework.
In the consideration of the effect of network behaviors, the traditional QoS mechanism isanalyzed and a new video-oriented QoS method which applies the scalable coding of H.263 isproposed. Then a service-based QoS qualitative description method and a QoS negotiationmechanism are proposed.
Based on the quality adaptation mechanism for video playback in the context of unicast and the proxy caching mechanism for VOD system,a proxy caching quality adaptation mechanism is proposed using layered encoding model for realtime streaming media playback in the context of multicast over the Internet. The algorithms of add layer and drop layer and the processes of layer allocation and layer replacement in the proxy cache are discussed.
An inter frame 3D DCT subband hierarchical coding is proposed in this paper Compared with other coefficient layered coding,this method can get hierarchy of time layer and space layer at the same time Also,it can overcome frequency aliasing effect in general subband coding,and is more flexible than the resolution layered coding which uses temporal subsampling and spacial filter Computer simulation for several well known sequences shows us it can realize the hierarchical image coding which is suitable for the future communication.
A new variable bit rate layered coding scheme based on subband coding is given in this paper.
In this paper, we examine the performance of specific implementations of multiple description coding and of layered coding for video streaming over error-prone packet switched networks.
It is shown that, given specific implementations, there is a large variation in relative performance between multiple description coding and layered coding depending on the employed transmission scheme.
For scenarios where the packet transmission schedules can be optimized in a rate-distortion sense, layered coding provides a better performance.
The proxy can perform media adaptation on its own, either relying on layered coding or using transcoding mainly in the decompressed domain.