基于多描述和不等差错保护的航空遥感图像传输方法

Aerial Remote Sensing Image Transmission Using Multiple Description Coding and Unequal Error Protection

本文提出了一种针对航空遥感图像传输的信源信道联合编码方法.将小波变换后的图像进行小波树分组以形成多描述,并重复描述重要的低频子带系数;然后利用改进的多级树集合分裂(SPIHT)算法对每个描述单独编码,并为其提供不等差错保护.为保证编码实时性,提出了一种快速的码率分配搜索算法.仿真结果表明该方法在频率选择性莱斯衰落信道下实现了遥感图像的鲁棒传输,且具有较低的复杂度.

This paper proposes a joint source-channel coding scheme for transmission of aerial remote sensing image.After the image has been wavelet transformed,the wavelet trees are divided into independently decodable groups to produce multiple descriptions,and coefficients in the low-low band are repeated by two descriptions due to their significance.Each description is compressed separately by a modified set partitioning in hierarchical trees（SPIHT） encoder and unequally protected.To meet realtime performance,a fast rate-allocation algorithm is proposed.Experiment results show that our system achieves robust image transmission over Rician frequency-selective fading channels with low complexity.