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利用小波去噪

于 2023-01-30 发布 文件大小:45.90 kB
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资源描述利用小波变换把含噪信号分解到多尺度中,小波变换多采用二进型,然后在每一尺度下把属于噪声的小波系数去除,保留并增强属于信号的小波系数,最后重构出小波消噪后的信号。其中关键是用什么准则来去除属于噪声的小波系数,增强属于信号的部分。其中,若对小波系数进行阈值处理,就可以在小波变换域中去除低幅度的噪声和我们所不期望的信号;然后进行离散小波变换逆变换,尽管所恢复信号丢失了一点细节(对应小尺度时的幅度较小的小波变换系数),但仍将恢复我们所期望的信号。

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