| 光谱学与光谱分析 |
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| Detection of Late Blight Disease on Potato Leaves Using Hyperspectral Imaging Technique |
| HU Yao-hua1, PING Xue-wen1, XU Ming-zhu1, SHAN Wei-xing2, HE Yong3* |
1. College of Mechanical and Electronic Engineering, Northwest A & F University, Yangling 712100, China
2. College of Plant Protection, Northwest A&F University, Yangling 712100, China
3. College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310058, China |
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Abstract Hyperspectral imaging feature on potato leaves stressed by late blight was studied in the present paper. The experiment used 60 potato leaves. Among those 60 potato leaves, 48 leaves were vitro inoculated with pathogen of potato late blight, the rest 12 leaves were used as control samples. The leaves were observed for 7 continuous days before and after inoculated and samples including healthy and infested were acquired. Hyperspectral data of healthy and infected potato samples of different disease severity were obtained by the hyperspectral imaging system from 374 to 1 018 nm and then extract spectral data of region of interest(ROI) from those hyperspectral data by the ENVI software. In order to improve the signal-to-noise ratio, the spectral data were preprocessed using different pretreatment methods such as moving average smoothing, normalization, derivative, baseline etc. The least squares-support vector machine(LS-SVM) models were developed based on the raw and those preprocessed data. Among the nine models, the model that used the raw data and the data after the spectroscopic transformation performed best with the discrimination of 94.87%. It was demonstrated that it is realized to determine the potato late blight disease of different disease severity using hyperspectral imaging technique.
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Received: 2014-11-20
Accepted: 2015-03-20
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Corresponding Authors:
HE Yong
E-mail: yhe@zju.edu.cn
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