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A novel wavelet multiple thresholding algorithm for astronomical spectral signal denoising
Zhao Rui-Zhen; Hu Zhan-Yi; Hu Shao-Hai
Source PublicationSPECTROSCOPY AND SPECTRAL ANALYSIS
2007-08-01
Volume27Issue:8Pages:1644-1647
SubtypeArticle
AbstractBy 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.
KeywordAstronomical Spectra Wavelet Transform Multiple Threshold Denoising
WOS HeadingsScience & Technology ; Technology
WOS KeywordAUTO-EXTRACTION ; TRANSFORM ; IMAGE ; SHRINKAGE
Indexed BySCI
Language英语
WOS Research AreaSpectroscopy
WOS SubjectSpectroscopy
WOS IDWOS:000249252000048
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ia.ac.cn/handle/173211/9418
Collection09年以前成果
Affiliation1.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
Recommended Citation
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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