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冬小麥葉綠素含量高光譜檢測技術
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Chlorophyll Content of Winter Wheat Using Leaf-level Hyperspectral Data
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    摘要:

    以大田冬小麥葉綠素含量為研究對象,首先利用高光譜成像系統(tǒng)以線掃描方式獲取其反射光譜圖像,選擇感興趣區(qū)域(ROI)并計算出光譜平均反射率值;然后分別針對其原始光譜和一階差分光譜,通過相關分析和逐步回歸分析,得到能反映葉綠素含量變化的7個最佳優(yōu)化波長;進而基于該優(yōu)化波長采用多元線性回歸(MLR)方法組建模型,通過假設檢驗剔除對模型貢獻不顯著的3個波長變量。選用剩余的4個波長即710.85、767.42、650和520nm作為自變量重新建立模型,基于校正集和預測集模型的決定系數(shù)R2分別為0.8434和0.7093。研究結果表明,利用高光譜技術檢測大田冬小麥葉綠素含量的方法是可行的。

    Abstract:

    The leaflevel winter wheat hyperspectral response to its chlorophyll content was examined. Firstly, after the 316 scan line images were acquired, the cube image data was constructed and the region of interest (ROI)was selected, then after the average pixel intensity acquired, using correlation analysis combined with stepwise discrimination method for the origin reflective spectrum and the first derivative spectrum, the optimal wavelengths were selected respectively; the chlorophyll content model using multivariate linear regression (MLR) was constructed based on the above seven optimal wavelengths. After statistical significance testing, three wavelengths were abandoned, and the residual four wavelengths, i.e., 710.85,767.42,650 and 520nm were used to construct chlorophyll content prediction model. The prediction results showed that the determination coefficient were R2=0.8434 and R2=0.7093 for the training dataset and the validation dataset respectively. All of these indicated that with the hyperspectral technology, chlorophyll content of winter wheat could be predicted precisely. 

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王偉,彭彥昆,馬偉,黃慧,王秀.冬小麥葉綠素含量高光譜檢測技術[J].農(nóng)業(yè)機械學報,2010,41(5):172-177. Chlorophyll Content of Winter Wheat Using Leaf-level Hyperspectral Data[J]. Transactions of the Chinese Society for Agricultural Machinery,2010,41(5):172-177.

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