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A novel wavelet multiple thresholding algorithm for astronomical spectral signal denoising
Zhao Rui-Zhen; Hu Zhan-Yi; Hu Shao-Hai
2007-08-01
发表期刊SPECTROSCOPY AND SPECTRAL ANALYSIS
卷号27期号:8页码:1644-1647
文章类型Article
摘要By using the different relativities of spectral lines and noises in the wavelet domain, a novel wavelet multiple thresholding algorithm is presented in the present paper for astronomical spectra with low signal-noise-ratio (SNR). Firstly the wavelet coefficients are estimated by NeighShrink approach and then 0-1 coefficients are obtained. Based on the above binary coefficients, two kinds of relativity exponents at each scale and across scales respectively are defined for each wavelet coefficients. Finally decision coefficients are determined according to the magnitudes of the relativity exponents. This algorithm overcomes the over-reserving or over-shrinking disadvantages of the simple threshold method in that the decision coefficients are obtained by multiple criteria. Besides, large pulse noises can be removed by the presented algorithm because it takes spectral line features into consideration. The experimental results show that the proposed algorithm is computationally efficient and practical.
关键词Astronomical Spectra Wavelet Transform Multiple Threshold Denoising
WOS标题词Science & Technology ; Technology
关键词[WOS]AUTO-EXTRACTION ; TRANSFORM ; IMAGE ; SHRINKAGE
收录类别SCI
语种英语
WOS研究方向Spectroscopy
WOS类目Spectroscopy
WOS记录号WOS:000249252000048
引用统计
文献类型期刊论文
条目标识符http://ir.ia.ac.cn/handle/173211/9418
专题09年以前成果
作者单位1.Beijing Jiao Tong Univ, Sch Comp & Informat Technol, Beijing 100044, Peoples R China
2.Chinese Acad Sci, Inst Automat, Natl Key Lab Pattern Recognit, Beijing 100080, Peoples R China
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GB/T 7714
Zhao Rui-Zhen,Hu Zhan-Yi,Hu Shao-Hai. A novel wavelet multiple thresholding algorithm for astronomical spectral signal denoising[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS,2007,27(8):1644-1647.
APA Zhao Rui-Zhen,Hu Zhan-Yi,&Hu Shao-Hai.(2007).A novel wavelet multiple thresholding algorithm for astronomical spectral signal denoising.SPECTROSCOPY AND SPECTRAL ANALYSIS,27(8),1644-1647.
MLA Zhao Rui-Zhen,et al."A novel wavelet multiple thresholding algorithm for astronomical spectral signal denoising".SPECTROSCOPY AND SPECTRAL ANALYSIS 27.8(2007):1644-1647.
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