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Hyperspectral Discrimination and Response Characteristics of Stressed Rice Leaves Caused by Rice Leaf Folder

文献类型： 外文期刊

作者： Liu, Zhanyu 1 ; Cheng, Jia-an 2 ; Huang, Wenjiang 3 ; Li, Cunjun 3 ; Xu, Xingang 3 ; Ding, Xiaodong 1 ; Shi, Jingjing; 1 ;

作者机构： 1.Hangzhou Normal Univ, Inst Remote Sensing & Earth Sci, Hangzhou 311121, Zhejiang, Peoples R China

2.Zhejiang Univ, Dept Plant Protect, Hangzhou, Zhejiang, Peoples R China

3.Beijing Res Ctr Informat Technol Agr, Beijing, Peoples R China

4.Zhejiang Univ, Inst Agr Remote Sensing & Informat Technol, Hangzhou, Zhejiang, Peoples R China

关键词： Hyperspectral remote sensing;Rice crop;Rice leaf folder;Principal components analysis (PCA);Support vector classification (SVC)

期刊名称：COMPUTER AND COMPUTING TECHNOLOGIES IN AGRICULTURE V, PT II

ISSN： 1868-4238

年卷期： 2012 年 369 卷

页码：

收录情况： SCI

摘要： Detecting plant health condition plays an important role in controlling disease and insect pest stresses in agricultural crops. In this study, we applied support vector classification machine (SVC) and principal components analysis (PCA) techniques for discriminating and classifying the normal and stressed paddy rice (Oryza sativa L.) leaves caused by rice leaf folder (Cnaphalocrocis medinalis Guen). The hyperspectral reflectance of paddy rice leaves was measured through the full wavelength range from 350 to 2500nm under the laboratory condition. The hyperspectral response characteristic analysis of rice leaves indicated that the stressed leaves presented a higher reflectance in the visible (430 similar to 470 nm, 490-610 nm and 610 similar to 680 nm) and one shortwave infrared (2080 similar to 2350 nm) region, and a lower reflectance in the near infrared (780 similar to 890 nm) and the other shortwave infrared (1580 similar to 1750 nm) region than the normal leaves. PCA was performed to obtain the principal components (PCs) derived from the raw and first derivative reflectance (FDR) spectra. The nonlinear support vector classification machine (referred to as C-SVC) was employed to differentiate the normal and stressed leaves with the front several PCs as the independent variables of C-SVC model. Classification accuracy was evaluated using overall accuracy (OA) and Kappa coefficient. OA of C-SVC with PCA derived from both the raw and FDR spectra for the testing dataset were 100%, and the corresponding Kappa coefficients were 1. Our results would suggest that it's capable of discriminating the stressed rice leaves from normal ones using hyperspectral remote sensing data under the laboratory condition.

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