Robust image communication system based on wavelet transform analog coding
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摘要: 在复杂度和延迟受限或者可变信道条件下,由于通信系统的一体化设计,信源信道联合编码(JSCC, Joint Source-Channel Coding)技术的应用有助于改善传统的分离结构系统.针对带宽功率限制模拟信道,提出了一种结合了小波变换编码和香农映射信源信道联合编码的静止图像模拟编码传输方法;并基于更加合理的考虑了信道噪声的重建图像失真估计,提出了相应的联合优化带宽分配算法.仿真及分析表明,由于信源信道的联合优化及具有模拟编码传输的特点,该方法表现出良好的编码传输性能,且编解码复杂度和延迟小;同时在信道失配情况下表现出的柔性降级/改善特性有助于提高可变信道条件下系统的鲁棒性和信道带宽利用率.Abstract: For the applications with complexity and delay limit or in varying channel condition, joint source-channel coding (JSCC) helps to improve the conventional tandem communication system since the integrative system design. For bandwidth and power-limited analog channel, an analog coding and transferring method of image which combines wavelet transform and Shannon mapping JSCC was proposed, and based on more rational distortion estimation in consideration of channel noise, an algorithm for jointly optimum channel bandwidth allocation was developed. Simulations and analysis show that, because of the joint source-channel optimization and the capacity of taking the advantage of analog coding and transferring, the image communication system performs well and has small coding/decoding complexity and delay, and it also exhibits the properties of gracefully degradation and improvement with channel mismatch that are helpful to improve the system robustness and bandwidth efficiency in varying channel condition.
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Key words:
- image coding /
- image communication systems /
- wavelet transforms /
- robustness /
- subband coding
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