| 小波firm阈值滤波的光谱实时采集方法 |
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| 引用本文： | 李正刚,吴一辉,宣明. 小波firm阈值滤波的光谱实时采集方法[J]. 光学精密工程, 2010, 18(2): 357-362 |
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| 作者姓名： | 李正刚 吴一辉 宣明 |
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| 作者单位： | 中国科学院长春光学精密机械与物理研究所应用光学国家重点实验室;中国科学院研究生院; |
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| 基金项目： | 国家863高技术研究发展计划资助项目(No.2006AA04Z367);;国家863高技术研究发展计划重点资助项目(No.2007AA042102) |
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| 摘 要： | 为了提高微型光谱仪光谱采集精度，提出了一种利用小波域firm阈值滤波去除随机噪声的方法。首先采集2次光谱谱线，取均值作为待处理谱线。然后计算出这两次谱线的噪声标准差取代传统小波去噪中的噪声标准差估计，运用通用阈值法 作为上阈值。调整下阈值将待处理谱线小波firm阈值滤波，并判断滤波后偏差是否在计算的噪声方差内。实验结果表明：优于传统10次平均法，在高采集精度的基础上提高了采集速度。在以光纤光谱仪为主体的微型生化分析仪样品检测过程中的应用表明：提高了检测精度，减少了检测时间,提高效率4-5倍。
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| 关 键 词： | 小波滤波 CCD 光谱分析 方差估计 |
| 收稿时间： | 2009-07-15 |
| 修稿时间： | 2009-12-01 |
A Mothed of Spectrum Data Real-time Acquisition with Wavelet Firm Shrinkage Filtering |
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| LI Zheng-gang,,WU Yi-hui,XUAN Ming. A Mothed of Spectrum Data Real-time Acquisition with Wavelet Firm Shrinkage Filtering[J]. Optics and Precision Engineering, 2010, 18(2): 357-362 |
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| Authors: | LI Zheng-gang WU Yi-hui XUAN Ming |
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| Affiliation: | 1.State Key Laboratory of Applied Optics;Changchun Institute of Optics;Fine Mechanics and Physics;Chinese Academy of Sciences;Changchun 130033;China;2.Graduate University of Chinese Academy of Sciences;Beijing 100039;China |
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| Abstract: | A method for spectral data real-time acquisition with Firm shrinkage wavelet filtering was presented in this paper to improve the performance of biochemical analyzers. Firstly,two spectral lines were acquired and their average spectrum was taken to be processed. Then,the noise variance from two spectral lines was calculated to be used as the next threshold to replace the noise variance estimation based on traditional wavelet denoising. Furthermore,by adjusting the threshold on the line,the average spectrum ... |
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| Keywords: | wavelet filtering CCD spectral acquisition spectral analysis noise variance estimation |
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