油菜氮素的多光谱图像估算模型研究

doi:10.3864/j.issn.0578-1752.2011.16.004

中国农业科学 ›› 2011, Vol. 44 ›› Issue (16): 3323-3332.doi: 10.3864/j.issn.0578-1752.2011.16.004

• 耕作栽培·生理生化·农业信息技术 • 上一篇下一篇

油菜氮素的多光谱图像估算模型研究

张晓东, 毛罕平, 左志宇, 孙俊, 张红涛

江苏大学农业工程研究院/现代农业装备与技术省部共建教育部重点实验室

收稿日期:2010-12-01 修回日期:2011-02-28 出版日期:2011-08-15 发布日期:2011-03-09
通讯作者: 通信作者毛罕平，Tel/Fax：0511-88797338；E-mail：maohp@ujs.edu.cn
作者简介:张晓东，Tel/Fax：0511-88797338；E-mail：zxd700227@126.com
基金资助:
国家自然科学基金项目（61075036）、中国博士后科学基金（20100481097）、江苏高校优势学科建设工程资助项目（苏财教（2011）8号）、江苏省农业装备与智能化高技术研究重点实验室资助项目（BM2009703）、江苏省高校自然科学基础研究重大项目（10KJA210010）、江苏大学高级专业人才基金项目（10JDG081）、江苏大学博士后基金项目（201009）

Multi-Spectral Images Estimation Models for Nitrogen Contents of Rape

ZHANG Xiao-Dong, MAO Han-Ping, ZUO Zhi-Yu, SUN Jun, ZHANG Hong-Tao

江苏大学农业工程研究院/现代农业装备与技术省部共建教育部重点实验室

Received:2010-12-01 Revised:2011-02-28 Online:2011-08-15 Published:2011-03-09
Contact: Xiao-Dong ZHANG

摘要/Abstract

摘要： 【目的】充分利用可见光、近红外多谱段图像的反射强度分布信息进行油菜氮素诊断，实现对油菜氮素水平的定量估算，为油菜营养的科学管理提供理论依据和技术支撑。【方法】利用多光谱CCD获取不同氮素水平的油菜冠层图像，采用中值滤波法对图像进行预处理；通过二维最大信息熵阈值分割法对多光谱图像进行背景分割；对多光谱图像的均值和比值、差值融合特征进行提取。【结果】通过相关分析，发现ARV1、AVS560、ADV1、AVS660、g等特征在整个生长期与油菜氮素的相关性均较高，考虑到多光谱变量间存在的多重共线性影响，利用逐步回归法建立了不同生长期油菜氮素的多光谱图像特征预测模型。【结论】初步探明了不同生育时期油菜氮素的多光谱图像特征，实现了采用多光谱图像技术对油菜氮素水平的定量估算。

关键词: 油菜, 氮素, 多光谱图像, 逐步回归

Abstract: 【Objective】Multi-spectral image analysis method was used to quantitatively analyze the rape total nitrogen content.【Method】The images of rape canopy were taken by the multi-spectral camera and were preprocessed by the median-filtering method. Two-dimensional maximum entropy segment method was used to complete background segmentation of multi-spectral images. 【Result】 By extracting mean and ratio of multi-spectral images of rape canopy , it was found that the features of ARV1, AVS560, ADV1, AVS660 and g are highly correlated with nitrogen content in the whole growth period. Considering the serious multicollinearity between multi-spectral variable, the prediction model of nitrogen content of rape at different growth stages was built by stepwise regression method. 【Conclusion】The reflection intensity distribution information of the visible light and the near infrared light is sufficiently utilized in this research to diagnose the nitrogen content of rape. The multi-spectral image features of the nitrogen content of rape at different growth stages were preliminarily verified. The result shows that the method of multi-spectral image analysis can be used to quantitatively analyze the rape total nitrogen content. This provides a theoretical basis and technical support for the scientific management of rape nutrition.

Key words: Rape, Nitrogen, Multi-spectral image, Stepwise regression

中图分类号:

S121

张晓东, 毛罕平, 左志宇, 孙俊, 张红涛. 油菜氮素的多光谱图像估算模型研究[J]. 中国农业科学, 2011, 44(16): 3323-3332.

ZHANG Xiao-Dong, MAO Han-Ping, ZUO Zhi-Yu, SUN Jun, ZHANG Hong-Tao. Multi-Spectral Images Estimation Models for Nitrogen Contents of Rape[J]. Scientia Agricultura Sinica, 2011, 44(16): 3323-3332.

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油菜氮素的多光谱图像估算模型研究

Multi-Spectral Images Estimation Models for Nitrogen Contents of Rape

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