This paper addresses the issue of cell loss and its consequent effect on video quality in a packet video system, and examines possible compensative measures. In the system's enconder, adaptive spectral separation is used to develop a two-layer coding scheme comprising a high priority layer to carry essential video data and a low priority layer with data to enhance the video image. A two-step er...

SNR scalability, used in two-layer video coding, guarantees good base quality pictures at the expense of increased overall bit-rate. By understanding the inherent ine ciencies of enhancement layer coding we have developed an optimisation method called optimal coe cient adjustment in order to reduce overall bit-rates to levels consistent with single-layer operation.

Signal-to-noise ratio (SNR) scalability has been incorporated into the MPEG-2 video-coding standard to allow for the delivery of two services with the same spatial and temporal resolution but different levels of quality. Scalable video coding has many advantages, such as its capability of coping with bandwidth variations, high flexibility and so on. However, few accurate rate control schemes fo...

In this paper, we demonstrate inter-layer prediction tools for scalable video coders. The proposed scalable coder is designed to support not only spatial, quality and temporal scalabilities, but also view scalability. In addition, we propose quad-tree inter-layer prediction tools to improve coding efficiency at enhancement layers. The proposed inter-layer prediction tools generate texture predi...

A novel Wyner-Ziv scalable (WZS) video coding approach is proposed to enhance MPEG-4 fine granularity scalability (FGS). Starting from the same base layer as MPEG-4 FGS, the proposed coder can achieve higher coding efficiency using Wyner-Ziv coding, by selectively exploiting the high quality reconstruction of the previous frame in the enhancement layer bitplane coding of the current frame. This...

In this paper, we propose a novel architecture for scalable video coding, namely, Progressive Fine Granularity Scalable (PFGS) coding, which can provide high coding efficiency along with good bandwidth adaptation and error recovery properties. Unlike the Fine Granularity Scalable (FGS) coding in MPEG-4 proposal, some of the enhancement layers in a current frame are predicted from a high quality...

We propose a new approach to achieve eÆcient scalability in audio coders, and demonstrate its performance using the MPEG-4 Advanced Audio Coder (AAC). In conventional scalable coding, the enhancement-layer performs straightforward re-quantization of the base-layer reconstruction error. This coding scheme implicitly discards useful information from the base-layer, and does not truly minimize a p...

In wireless networks, the bandwidth is considered one of the most scarce and valuable resources. The physical layer network coding (PNC) technique encourages strategically picked senders to interfere so that the destination nodes can leverage the network level information to recover the signals. PNC can yield higher capacity than network layer network coding when applied to wireless networks. H...

Scalable video coding (SVC) achieves layered coding structure with adaptive inter-layer prediction which causes high computational complexity. To decrease the computational complexity of SVC, we present a fast algorithm to speed up the inter-mode decision process for SVC. The proposed algorithm early terminates inter-mode decision in the enhancement layer by estimating the rate-distortion (RD) ...

Scalable Video Coding was designed in response to the growing need for flexibility in video transmission over networks and channels. MPEG-4 Scalable Video Coding (SVC) is a recently finalized standard which introduces new coding tools such as spatial, temporal and quality scalability, to produce a layer-based scalable video stream. Additionally, inter-layer prediction allows a layer to use info...