We address the problem of robust transmission of compressed visual information over unreliable networks. Our approach employs the principle of multiple-descriptions, through preand post-processing of the image data, without modification to the source or channel codecs. We employ oversampling to add redundancy to the original image data followed by a partitioning of the oversampled image into “e...

1 This research was supported by the Towards Freeband Communication Impulse of the technology programme of the Dutch Ministry of Economic Affairs. Abstract The nature of ad hoc networks makes it a challenge to offer connections with an assured quality. In order to improve the performance of the network, multipath routing in combination with multiple description coding (MDC) is proposed. By spli...

For state estimation over a communication network, efficiency and reliability of the network are critical issues. The presence of packet dropping and communication delay can greatly impair our ability to measure and predict states. In this paper, multiple description (MD) codes, a type of network source codes, are used to compensate for this effect on Kalman filtering. We consider two packet dr...

—In this paper we discussed the application and the implementation of multipath routing and multiple description coding (MDC) extension of OLSR, called MP-OLSR. It is based on the link state algorithm and employs periodic exchange of messages to maintain topology information of the networks. In the mean time, it updates the routing table in an on-demand scheme and forwards the packets in multip...

Developing real time multimedia applications for best effort networks such as the Internet requires prohibitions against jitter delay and frame loss. This problem is further complicated in wireless networks as the rate of frame corruption or loss is higher in wireless networks while they generally have lower data rates compared to wired networks. On the other hand, variations of the bandwidth a...

A new approach for multiple description video coding using motion compensated prediction is proposed. The temporal predictor is designed to provide a desired trade-off between prediction gain and mismatch between the predictions obtained at the encoder and that at the decoder when only one description is available. The mismatch signal is explicitly coded to avoid error propagation. The system c...

Multiple Description Coding (MDC) is a plausible way to use the diversity of packet networks to increase the robustness of the transmission to packet losses. The redundancy that is introduced via MDC can also be used to increase the robustness of the transmission to bit-errors. This paper presents a novel decoding method for GMM (Gaussian Mixture Model)-based MDC in the presence of detected bit...

An effective scheme of multiple description video coding is proposed for transmission over packet loss network. Using priority encoding transmission, we attempt to overcome the limitation of specific scalable video codec and apply FEC-based multiple description to a common video coder, such as the standard H.264. Firstly, multiple descriptions can be generated using temporal downsampling and th...

Multiple description coding (MDC) schemes have become popular as robustness tools in packet switched networks where multiple paths with varying packet loss rates are available. In this paper we propose a new MDC scheme for video using 3D wavelet decomposition. The spatio-temporal coefficients are then grouped using either a random, uniform scheme or a hierarchical scheme. The descriptions are c...

When sending speech data over lossy networks like the internet, multiple-description (MD) coding is a means to improve the perceived quality by dividing the data into multiple descriptions which are then sent as separate packets. In doing so the speech signal can still be decoded even if only parts of these descriptions are received. The present paper describes the structure of a software which...