摘要
提出一种对SPIHT编码中D型集合分裂的改进算法,以及一些优化建议。通过引入对O型集合重要性的判断,实现先整体后个体的编码思路;通过预测编码消除集合与子集合间、节点与叶节点间的状态冗余。实验证明,算法提高了在输出码流中重要系数的比率,获得优于SPIHT算法的PSNR。
An improved method of splitting the D set in SPIHT coder is proposed, and some advice of how to optimize it is also introduced. In coding procedure, the idea which general coding is prior to individual coding is realized by estimating the importance of O set. The redundancy of states between set and subset, node and its leaves are eliminated by predicting code. The experimental results indicate that the algorithm proposed in this article improves the ratio of important coefficient in output bit stream and consequently obtains the PSNR which is superior to the SPIHT algorithm.
出处
《科学技术与工程》
2008年第14期4009-4012,共4页
Science Technology and Engineering
基金
湖南省教育厅一般项目(04C678)资助
关键词
小波变换
空间方向树
嵌入式零数小波编码
SPIHT
wavelet transform spatial-orientation tree embedded zerotree coding set partitioning in hierarchical tree
