Spectroscopy and Spectral Analysis, Volume. 42, Issue 4, 1229(2022)
Identification of Early Lodging Resistance of Maize by Hyperspectral Imaging Technology
Figures & Tables(9)
Fig. 1. Spectral image correction and spectral extraction method
(a): Color image of leaves; (b): k-means cluster result; (c): Leaves segmentation result
Fig. 2. Average spectral curves of lodging-resistant varieties and lodging varieties
Fig. 3. Spectral characteristics selected by the SPA algorithm at various densities
Fig. 4. Parameter optimization effects of SPA-SVM model at various densities
Fig. 4. Parameter optimization effects of PCA-SVM model at various densities
Table 1. The division of maize sample data sets
View tableView in ArticleTable 1. The division of maize sample data sets
项目 5 000株·亩-1 7 000株·亩-1 9 000株·亩-1 抗倒样本 不抗倒样本 总计 抗倒样本 不抗倒样本 总计 抗倒样本 不抗倒样本 总计 训练集 95 91 186 96 96 192 94 95 189 测试集 30 30 60 30 30 60 30 30 60 总计 125 121 246 126 126 252 124 125 249
Table 2. Contribution rate of principal component at each density
View tableView in ArticleTable 2. Contribution rate of principal component at each density
主成分 5 000 株·亩-1 7 000 株·亩-1 9 000 株·亩-1 贡献率
/%累计
贡献率
/%贡献率
/%累计
贡献率
/%贡献率
/%累计
贡献率
/%PC1 49.28 49.28 45.59 45.59 48.31 48.31 PC2 34.30 83.58 32.10 77.69 36.06 84.37 PC3 8.77 92.35 12.42 90.11 7.58 91.95 PC4 3.07 95.42 3.16 93.27 3.40 95.35 PC5 1.92 97.34 2.52 95.79 1.76 97.11 PC6 1.13 98.47 1.15 96.94 0.87 97.78 PC7 0.50 98.97 1.09 98.03 0.61 98.59 PC8 0.21 99.18 0.56 98.59 0.41 99.00 PC9 0.19 99.37 0.39 98.98 0.24 99.24 PC10 0.17 99.54 0.25 99.23 0.18 99.42
Table 3. The selected model parameters at each density
View tableView in ArticleTable 3. The selected model parameters at each density
项目 5 000株·亩-1 7 000株·亩-1 9 000株·亩-1 PCA-SVM SPA-SVM PCA-SVM SPA-SVM PCA-SVM SPA-SVM 惩罚参数C 29 217 211 219 23 211 核参数γ 2-11 2-13 2-11 2-15 2-7 2-7 交叉验证正确率/% 79.03 100 83.33 97.40 76.19 98.94 测试集分类正确率/% 78.33 83.33 83.33 98.33 71.67 95
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Tian-liang ZHANG, Dong-xing ZHANG, Tao CUI, Li YANG, Chun-ji XIE, Zhao-hui DU, Xiang-jun ZHONG. Identification of Early Lodging Resistance of Maize by Hyperspectral Imaging Technology[J]. Spectroscopy and Spectral Analysis, 2022, 42(4): 1229
Paper Information
Category: Research Articles
Received: Apr. 9, 2021
Accepted: --
Published Online: Jul. 25, 2023
The Author Email: ZHANG Tian-liang (tianliangzn@163.com)
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