新的基于分裂层树编码图像的传输方案.doc

新的基于分裂层树编码图像的传输方案 摘要:提出了一种新的基于分裂层树编码（spiht）的实时图像传输方案。该方案首先将图像数据进行小波变换，然后将变换后的小波系数进行合理分块并分别采用 spiht编码，以防止在无线信道传输中产生误码扩散。最后为了提高重构图像的恢复质量，提取每一个块中最高一级的小波系数数据进行重复传输，同时采用最优的帧长，提高图像传输系统的吞吐量。理论分析和仿真结果表明，提出的方案比传统的基于spiht算法的图像传输方案具有更高的抗误码特性，重构图像的峰值信噪比提高约10db。 关键词:分裂层树编码；图像无线传输；最优帧长；吞吐量；抗误码  new scheme for image transmission based on spiht  fu yao*， liu qing.li school of information science and engineering, shenyang ligong university, shenyang liaonning 110159, china abstract: in this paper, a novel real-time image transmission scheme based on spiht is presented. firstly, the image data need to be transformed by wavelet. secondly, in order to resist error pervasion when image is transmitted, the wavelet coefficients are separated into small blocks and encoded by spiht. finally, in order to improve the quality of the restructure image, the wavelet coefficients of the highest level in every block are transmitted repeatedly. in order to improve throughput of image transmission system, the optimum frame length is proposed.. both theoretical demonstration and simulation results here have validated that the proposed scheme provides higher character of resisted error than traditional scheme based on spiht, and can improve the peak signal to noise ratio of the restructure image about 10db.in this paper, a new real.time image transmission scheme based on set partitioning in hierarchical tree (spiht) was proposed. firstly, the image data needed to be transformed by wavelet. secondly, in order to resist error pervasion when image was transmitted, the wavelet coefficients were separated into small blocks and encoded by spiht. finally, in order to improve the quality of the restructured image, the wavelet coefficients of the highest level in every block were transmitted repeatedly. in order to improve the throughput of the image transmission system, the optimum frame length was proposed. both theoretical demonstration and simulation results here have validated that the proposed sch