摘要
介绍了一维小波变换和用于小波去噪的硬门限和软门限处理方法 ,给出了4种门限估算准则 .根据信号与噪声在小波变换的多尺度上呈现出不同的传播特性 ,利用不同的门限估算准则 ,使用软门限对被噪声污染的一维信号的小波变换进行去噪处理 ,并作出了 4种门限估算准则的去噪效果曲线图 .计算机仿真结果表明 ,门限法具有很好的实用价值 .
The one dimension wavelet transform was introduced and the method of the hard threshold and the soft threshold that is used in wavelet de noising.Four kinds of rules of assessing threshold are given.According to the difference between characteristics of signal and that of noise in different scales of the wavelet transform,the method of the soft threshold and the different rules of assessing threshold are used to de noise the noisy one dimension signal.And the performance of the four kinds of rules is compared in a graph.The result of the computer simulation indicates that the method of threshold has practical value.
出处
《山东大学学报（理学版）》
CAS
CSCD
北大核心
2001年第3期306-311,共6页
Journal of Shandong University(Natural Science)
基金
国家自然科学基金资助 (69772 0 1 6)
关键词
小波变换
门限法
小波去噪
wavelet transform
method of threshold
de noising
