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首页> 外文期刊>Signal Processing Magazine, IEEE >Projection-Based Wavelet Denoising [Lecture Notes]
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Projection-Based Wavelet Denoising [Lecture Notes]

机译:基于投影的小波去噪[讲义]

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摘要

In this lecture note, we describe a wavelet domain denoising method consisting of making orthogonal projections of wavelet (subbands) signals of the noisy signal onto an upside down pyramid-shaped region in a multidimensional space. Each horizontal slice of the upside down pyramid is a diamond shaped region and it is called an -ball. The upside down pyramid is called the epigraph set of the -norm cost function. We show that the method leads to soft-thresholding as in standard wavelet denoising methods. Orthogonal projection operations automatically determine the soft-threshold values of the wavelet signals.
机译:在本讲义中,我们描述了一种小波域去噪方法,该方法包括将噪声信号的小波(子带)信号正交投影到多维空间中倒置的金字塔形区域上。倒置金字塔的每个水平切片都是菱形区域,称为-球。上下颠倒的金字塔称为-norm成本函数的题词集。我们表明,该方法导致像标准小波去噪方法中的软阈值处理。正交投影操作会自动确定小波信号的软阈值。

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