Water Content Estimation in Processing Tomato Leaves Using Gram －Schmidt Algorithm

YIN Xiao-jun; LI Man-chun; ZHAO Si-feng; WANG Deng-wei

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Water Content Estimation in Processing Tomato Leaves Using Gram －Schmidt Algorithm

- Water Content Estimation in Processing Tomato Leaves Using Gram －Schmidt Algorithm
- Bulletin of Soiland Water Conservation Vol. 31, Issue 2, Pages: 132-136(2012)
- 作者机构：
  
  1. 南京大学地理信息科学系,江苏,南京,210093
  2. 石河子大学信息科学与技术学院,新疆,石河子,832000
  3. 石河子大学农学院,新疆,石河子,832000
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published：2012
- 稿件说明：
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YIN Xiao-jun, LI Man-chun, ZHAO Si-feng, et al. Water Content Estimation in Processing Tomato Leaves Using Gram －Schmidt Algorithm[J]. Bulletin of Soiland Water Conservation, 2012, 31(2): 132-136.
DOI：

YIN Xiao-jun, LI Man-chun, ZHAO Si-feng, et al. Water Content Estimation in Processing Tomato Leaves Using Gram －Schmidt Algorithm[J]. Bulletin of Soiland Water Conservation, 2012, 31(2): 132-136. DOI：

摘要

Gram-Schmidt正交变换算法通过成分提取提高了非线性回归模型的精度。利用Gram-Schmidt正交变换算法，对加工番茄病叶相对水分含量进行了高光谱估测。研究结果表明，病叶相对水分含量的敏感波段为可见光波段R

695

以及近红外波段R

761

，R

1446

，R

1940

和R

2490

。对敏感波段进行正交变换，得到相对水分含量与R

1940

和R

2490

的非线性回归模型，相关系数为0.724，相对误差为0.52％，标准误差(RMSE)为0.13，真实值与预测值拟合的相关系数为0.623，表明该方法优于传统相对水分含量的线性模型。研究结果可为加工番茄病害胁迫下品质的精确诊断提供了技术支撑。

Abstract

Based on measured water contents and spectral reflectance of the bacterial spots on tomato leaves，we attempted to estimate the water contents of diseased leaves using the Gram-Schmidt transformation algorithm． The results show R694 in visible and R761，R1446，R1940，and R2490in near-infrared wavelengths were the spectra sensitive to the variations of water contents． Non-linear regression models were then developed to predict water contents using reflectance at R1940 and R2490 using Gram-Schmidt orthogonal transformation algorithm，with high R2(0． 724)，low relative error (0． 52%) and RMSE (0． 13)． This model was proved superior to the traditional linear model． The findings of this research can provide technical supports for diseases diagnosis of tomato plants under stress．

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