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首页> 外文期刊>International journal of communication systems >Robust JPEG image transmission using unequal error protection and code combining
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Robust JPEG image transmission using unequal error protection and code combining

机译：使用不均等的错误保护和代码组合实现可靠的JPEG图像传输

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摘要

JPEG image transmission over noisy channels is highly problematic due to the sensitivity of the JPEG bit stream to error propagation. The use of resynchronization markers and channel coding do not alleviate the problem completely thus making retransmissions inevitable. In packetized image transmission, image packets are repeated n times, to ensure reliable transmission. This paper proposes a new unequal error protection (UEP) scheme which jointly optimizes the allocation of channel code rates and number of repeats to image packets, subject to a constraint on the maximum overall transmission rate. The coding scheme used is the rate compatible punctured convolutional code coupled with the code-combining technique. An unequal allocation of headers to the image packets is also performed in order to reduce the overall distortion due to error propagation. Simulation results show that the proposed UEP scheme provides a gain of more than 8 dB in peak-to-peak signal-to-noise ratio over a tandem scheme. The flexibility of the proposed scheme, and the major performance gains obtained, make the scheme appealing for applications like, web-based image browsing, multi-hop networks, and wireless image transmission.
机译：由于JPEG位流对错误传播的敏感性，在嘈杂的通道上进行JPEG图像传输存在很大问题。使用重新同步标记和信道编码并不能完全缓解问题，因此不可避免地需要重传。在打包图像传输中，图像数据包重复n次，以确保可靠传输。本文提出了一种新的不等差错保护（UEP）方案，该方案共同优化了信道码率的分配和对图像数据包的重复次数，但要考虑最大总体传输率。所使用的编码方案是速率兼容删余卷积码和码合并技术。为了减少由于错误传播而引起的总体失真，还对图像分组进行了报头的不均等分配。仿真结果表明，与串联方案相比，所提出的UEP方案在峰峰值信噪比方面可提供大于8 dB的增益。所提出方案的灵活性以及所获得的主要性能提升，使得该方案吸引了诸如基于Web的图像浏览，多跳网络和无线图像传输之类的应用。

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