| 小波图像编码技术SPIHT的改进算法 |
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| 引用本文： | 钱剑,戚玉松,夏良正.小波图像编码技术SPIHT的改进算法[J].东南大学学报(自然科学版),2003,33(Z1):82-85. |
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| 作者姓名： | 钱剑 戚玉松 夏良正 |
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| 作者单位： | 1. 东南大学自动控制系,南京,210096
2. 南京理工大学自动化系,南京,210094 |
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| 摘 要： | 本文简单介绍了小波变换编码的流程、特点和小波基的选取.并根据灰度图像经小波变换以后系数的分布、统计特性,对现今十分流行的嵌入零树(EZW)、分层树集合分割排序(SPIHT)算术编码方法进行研究.综合分析了该类算法的优缺点,并提出2种不影响算法整体结构的改进意见,对SPIHT编码算法增加了一些初始化操作.实验结果表明,在一定比特率下,改进后的算法在相同码率时将会得到质量更优的恢复图像.
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| 关 键 词： | 零树 嵌入零树 分层树集合排序 不重要系数表 重要系数表 不重要集合表 |
| 文章编号： | 1001-0505(2003)增刊-0082-04 |
| 修稿时间： | 2003年5月15日 |
An improved algorithm of SPIHT based on wavelet transform |
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| Qian Jian,Qi Yusong,Xia Liangzheng.An improved algorithm of SPIHT based on wavelet transform[J].Journal of Southeast University(Natural Science Edition),2003,33(Z1):82-85. |
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| Authors: | Qian Jian Qi Yusong Xia Liangzheng |
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| Institution: | Qian Jian 1 Qi Yusong 2 Xia Liangzheng 1 |
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| Abstract: | This paper gives a brief introduction about the process of image coding, features and the choosing of wavelet filters.Based on the good statistical feature of wavelet image, it presents a study of the most popular coding methods: embedded zero wavelet (EZW), set partitioning in hierarchical trees (SPIHT). Synthesizing the advantages and disadvantages of this kind of methods, SPIHT is developed by two ways which don't affect its main frame to add some initial treatments. Results show that the improved algorithm has better effects in certain applications than the unimproved one. |
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| Keywords: | zero tree embedded zero wavelet set partitioning in hierarchical trees the list of insignificant pixels the list of significant pixels the list of insignificant sets |
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