| 基于离散小波变换的滤波方法研究 |
| |
| 引用本文： | 吴永宏,潘泉,张洪才,孟晋丽. 基于离散小波变换的滤波方法研究[J]. 系统仿真学报, 2004, 16(12): 2706-2708,2712 |
| |
| 作者姓名： | 吴永宏 潘泉 张洪才 孟晋丽 |
| |
| 作者单位： | 西北工业大学自动化学院,西安,710072 |
| |
| 基金项目： | 教育部“跨世纪优秀人才培养计划项目”基金，国家自然科学基金项目(60172037)。 |
| |
| 摘 要： | 推导出了经过多次离散小波变换后，白噪声在不同尺度上方差的另外一种表达式，应用到小波域硬阈值滤波中，通过数字仿真发现，二进小波的计算量较大，滤波效果较好，离散小波的计算量较小，滤波效果稍差，并对原因进行了说明。
|
| 关 键 词： | 离散小波变换 二进小波变换 方差 硬阈值 滤波 |
| 文章编号： | 1004-731X(2004)12-2706-03 |
Noise Reduction Method Research Based on Discrete Wavelet Transform |
| |
| WU Yong-hong,PAN Quan,ZHANG Hong-cai,MENG Jin-li. Noise Reduction Method Research Based on Discrete Wavelet Transform[J]. Journal of System Simulation, 2004, 16(12): 2706-2708,2712 |
| |
| Authors: | WU Yong-hong PAN Quan ZHANG Hong-cai MENG Jin-li |
| |
| Abstract: | After several discrete wavelet transforms, another expression of the deviation of white noise on every scale is given by us. Then it is applied to wavelet denoising by the hard threshold. The simulation shows that the cost of dyadic wavelet transform is greater than the one of discrete wavelet transform, and the denoising quality of the former is better than that of the latter. At last the reason is given. |
| |
| Keywords: | discrete wavelet transform dyadic wavelet transform deviation hard threshold noise reduction |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
