An Auto-Extraction Method of Spectral Line for Normal Galaxy Spectra
LIU Rong1,LIU San-yang1,ZHAO Rui-zhen2
1. Department of Mathematics，Xidian University, Xi’an 710071, China 2. School of Computer and Information Technology, Beijing Jiaotong University, Beijing 100044, China
Abstract：Spectral line extraction for normal galaxy spectra is the most difficult task in spectral line auto-extraction of celestial spectra. The present paper presents a novel technique of spectral line auto-extraction for normal galaxy spectra. Firstly, the Max operator of two spectra is defined, and the operator produces a new spectrum whose intensity at each wavelength is the maximum of intensities of the two spectra; Secondly, the continuum is fitted in an iterative way, where in each iteration, the traditional wavelet method is performed for the spectrum obtained by the Max operation of the original spectrum, and the continuum is fitted in the last iteration; Finally, adaptive local thresholding associated with the universal thresholding is used to extract spectral lines. Experiments show that this method is superior to the traditional wavelet method. It will be helpful to the spectral line based automated spectral classification and parameter measurement.
Key words：Spectral analysis;Normal galaxy;Spectral line extraction;Wavelet transform
刘 蓉1,刘三阳1,赵瑞珍2 . 正常星系光谱的一种谱线自动提取方法[J]. 光谱学与光谱分析, 2006, 26(03): 583-586.
LIU Rong1,LIU San-yang1,ZHAO Rui-zhen2 . An Auto-Extraction Method of Spectral Line for Normal Galaxy Spectra . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2006, 26(03): 583-586.
