Abstract
Compressed video sequences are vulnerable to channel errors, to the extent that minor errors and/or small losses can result in substantial degradation. Thus, protecting compressed data against channel errors is imperative. The use of channel coding schemes can be effective in reducing the impact of channel errors, although this requires that extra parity bits to be transmitted, thus utilizing more bandwidth. However, this can be ameliorated if the transmitter can tailor the parity data rate based on its knowledge regarding current channel conditions. This can be achieved via feedback from the receiver to the transmitter. This paper describes a channel emulation system comprised of a server/proxy/client combination that utilizes feedback from the client to adapt the number of Reed-Solomon parity symbols used to protect compressed video sequences against channel errors.
Highlights
With the advances in technology, applications such as video telephony, video conferencing, video-on-demand, video broadcasting, and video email have become a reality
To test the efficacy of the proposed approach, simulations were run for different video sequences by setting different proxy parameters
This paper described an adaptive system for error resilient transmission of compressed video over data networks
Summary
With the advances in technology, applications such as video telephony, video conferencing, video-on-demand, video broadcasting, and video email have become a reality. [12] presents feedback and error-protection strategies for wireless transmission of progressively coded video using an unequal error protection scheme that employs high-memory rate-compatible punctured convolutional codes with a sequential decoding algorithm This method assumes that the transmitter knows perfectly the long term channel statistics as well as the existence of an error-free low bit rate channel in both directions. The schemes proposed in [11,12,13,14] all tackle the problem of optimally coding video (in the R-D sense) for the purpose of transmission, based on feedback from the receiver to the transmitter, but do not address the problem of reliably transmitting previously coded video streams over data channels while utilizing feedback from the receiver to the transmitter They assume that the channel conditions are perfectly known or that feedback arrives in a timely fashion, which are not always possible. The server uses a three-state channel model and the feedback data from the client to estimate the future channel state and the protection level needed
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