基于整数小波的信源信道联合编码技术研究

Research on the Technology of Joint Source/Channel Coding Based on Integer Wavelet

提出了一套基于整数小波高频零树的信源/信道联合编码方案,该方案能快速编出具有嵌入渐进式传输功能的低码率码流。其基本原理是根据预先设定的一组阈值依次扫描信源,并得到相应系数的位置信息和值信息,然后分别进行编码和传输。该码流既能在无噪信道下进行无失真渐进传输,也能在有噪信道下进行低码率较为可靠的有失真嵌入式渐进传输。论文的实验结果可以看出,该方案在有噪信道下不仅能够在较高的压缩比下得到较高的峰值信噪比,而且能够在变化的噪声环境中使得信源更稳健更可靠地低码率传输。

This paper proposes a joint source-channel coding scheme based on integer wavelet high frequency zerotree, which can produce embedded progressive code stream with low bit-rate. In this scheme, by scanning the source with a set of pre-set thresholds, value and location information of significant wavelet coefficients are got, encoded and transmitted, respectively. The code stream resulted from this procedure can be transmitted losslessly and progressively over noiseless channels, or embedded progressively and reliably with a low bit-rate over noisy channels （random or burst noise）. Experiments show that this scheme can get high PSNR and compression rate over noisy channels, and can transmit the source more reliably and robustly with low bit-rate over varying channels.