| 基于正交小波包的茶叶近红外光谱特性分析 |
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| 引用本文： | 吕进,林敏,庄松林.基于正交小波包的茶叶近红外光谱特性分析[J].光谱学与光谱分析,2005,25(11):1790-1792. |
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| 作者姓名： | 吕进 林敏 庄松林 |
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| 作者单位： | 上海理工大学光电子信息工程学院,上海,200093;中国计量学院计量技术工程学院,浙江,杭州,310018;中国计量学院计量技术工程学院,浙江,杭州,310018;上海理工大学光电子信息工程学院,上海,200093 |
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| 基金项目： | 浙江省自然科学基金（202081）与浙江省留学人员科技活动择优项目资助 |
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| 摘 要： | 针对茶叶近红外光谱数据中存在着高度的共线性和高维数，根据小波包变换具有的去相关能力。通过引入保留能量和置零系数来定量描述茶叶近红外光谱小波包变换后的特性；分析与实验表明，正交小波包对近红外光谱具有较强的压缩能力，压缩后保留的能量为99．98％，而置零系数百分比高达95．87％；这一结果对近红外光谱图的存储、检索及快速处理都有着十分重要的意义。
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| 关 键 词： | 正交小波包 近红外光谱 茶叶 Shannon熵 |
| 文章编号： | 1000-0593（2005）11-1790-03 |
| 收稿时间： | 2004-03-18 |
| 修稿时间： | 2004-08-16 |
Analysis for the Near Infrared Spectrum Characteristic of Tea Based on Orthogonal Wavelet Packet |
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| L Jin,LIN Min,ZHUANG Song-lin.Analysis for the Near Infrared Spectrum Characteristic of Tea Based on Orthogonal Wavelet Packet[J].Spectroscopy and Spectral Analysis,2005,25(11):1790-1792. |
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| Authors: | L Jin LIN Min ZHUANG Song-lin |
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| Institution: | College of Optics and Electronics Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China. |
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| Abstract: | According to the high co-linearity and dimension in the near infrared(NIR) spectrum of tea,the present paper describes quantitatively the characteristic of tea NIR spectra with wavelet packet by introducing the retained energy and number of zeros,based on the decorrelation capacity of orthogonal wavelet packet.Results show that the energy retained is as high as 99.98% after compressing,while the percentage for number of zeros is 95.87%.It was concluded that orthogonal wavelet packet has a good compressibility for NIR spectra,which has significance in storing,searching and processing the NIR spectrogram. |
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| Keywords: | Orthogonal wavelet packet Near infrared spectrum Tea Shannon entropy |
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