| 光谱学与光谱分析 |
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| Study on the Projection Method Based on Principal Component of Tobacco Near-Infrared Spectrum and Application in Redrying Model |
| TAO Shuai1,MA Xiang2,LI Jun-hui1*,ZHANG Wen-juan1,ZHAO Long-lian1,WEN Ya-dong2,WANG Yi2,ZHANG Lu-da3 |
1. College of Information and Electrical Engineering, China Agricultural University, Beijing 100193, China
2. Technology Center of Yuxi Hongta Group, Yuxi 653100, China
3. College of Science, China Agricultural University, Beijing 100193, China |
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Abstract The present paper briefly describes the application of near-infrared spectroscopy technology in tobacco. Two methods for solving projection vector based on the principal component of near-infrared spectrum are reported. They are named as projection of basing on principal component and Fisher criterion by principal component analysis method (PPF_PCA for short) and projection of basing on principal component and Fisher criterion by solving eigenvalue (PPF_Eig for short), and they are studied and compared in the application and evaluation of the redrying model. The result of the first-dimensional projection on 9 kinds of tobacco leaf grading samples shows that, the diversity of the first-dimensional projection values of inter-class and intra-class by the PPF_PCA method is both larger than that by the PPF_Eig method, and the mean absolute deviation of the mean projection values of inter-class by the PPF_PCA method is about 1.26 times that of the PPF_Eig method. At the same time, this result is interpreted by using the contribution rate of the first-dimensional projection values. That is, the contribution rate of first-dimensional projection values by the PPF_PCA method is 93%, while the contribution rate of first-dimensional projection values by the PPF_Eig method is 77%. The former is about 1.21 times the later. Therefore, the first-dimensional projection values by PPF_PCA method include more information of diversity of both inter-class and intra-class. The similarity of samples inter-class and the diversity of samples intra-class can be evaluated more objectively from first-dimensional projection figure(on 9 kinds of tobacco leaf grading samples, 33 kinds of tobacco leaf grading samples and 6 redrying blending models), so it is more convenient to be used as a reference for the redrying model of tobacco, and it has a good application prospect in other formulation design of agricultural products (traditional Chinese medicine etc.)
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Received: 2008-11-06
Accepted: 2009-02-08
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Corresponding Authors:
LI Jun-hui
E-mail: caunir@cau.edu.cn
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