| 光谱学与光谱分析 |
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| Identification of Green Tea Brand Based on Hyperspectra Imaging Technology |
| ZHANG Hai-liang1, 2, LIU Xiao-li1, ZHU Feng-le1, HE Yong1* |
1. College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310058, China
2. School of Mechanical Engineering, East China Jiaotong University, Nanchang 330013, China |
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Abstract Hyperspectral imaging technology was developed to identify different brand famous green tea based on PCA information and image information fusion. First 512 spectral images of six brands of famous green tea in the 380～1 023 nm wavelength range were collected and principal component analysis (PCA) was performed with the goal of selecting two characteristic bands (545 and 611 nm) that could potentially be used for classification system. Then, 12 gray level co-occurrence matrix (GLCM) features (i.e., mean, covariance, homogeneity, energy, contrast, correlation, entropy, inverse gap, contrast, difference from the second-order and autocorrelation) based on the statistical moment were extracted from each characteristic band image. Finally, integration of the 12 texture features and three PCA spectral characteristics for each green tea sample were extracted as the input of LS-SVM. Experimental results showed that discriminating rate was 100% in the prediction set. The receiver operating characteristic curve (ROC) assessment methods were used to evaluate the LS-SVM classification algorithm. Overall results sufficiently demonstrate that hyperspectral imaging technology can be used to perform classification of green tea.
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Received: 2013-07-11
Accepted: 2013-11-24
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Corresponding Authors:
HE Yong
E-mail: yhe@zju.edu.cn
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