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中国农学通报 ›› 2022, Vol. 38 ›› Issue (9): 49-55.doi: 10.11924/j.issn.1000-6850.casb2021-0539

所属专题: 生物技术 水稻 棉花

• 农学·农业基础科学 • 上一篇    下一篇

基于数码图像的棉花叶片氮含量估测研究

洪波1,2(), 张泽1,2, 张强1,2, 马怡茹1,2, 易翔1,2, 吕新1,2()   

  1. 1石河子大学农学院,新疆石河子 832003
    2新疆生产建设兵团绿洲生态农业重点实验室,新疆石河子 832003
  • 出版日期:2022-03-25 发布日期:2022-04-02
  • 通讯作者: 吕新
  • 作者简介:洪波,男,1995年出生,甘肃岷县人,硕士研究生,研究方向:农业信息技术。通信地址:832003 新疆石河子市向阳街 石河子大学农学院绿洲生态实验室,Tel:17590393251,E-mail: 1210642199@qq.com
  • 基金资助:
    兵团重大科技计划项目“新疆兵团棉花生产大数据关键技术及农业大数据平台研发与应用”(2018AA004);国家自然基金项目“基于图谱融合的棉花氮素亏缺早期诊断机理研究”(42061058)

The Nitrogen Content in Cotton Leaves: Estimation Based on Digital Image

HONG Bo1,2(), ZHANG Ze1,2, ZHANG Qiang1,2, MA Yiru1,2, YI Xiang1,2, LV Xin1,2()   

  1. 1College of Agriculture, Shihezi University, Shihezi, Xinjiang 832003
    2The Key Laboratory of Oasis Ecology Agriculture, Xinjiang Production and Construction Corps, Shihezi, Xinjiang 832003
  • Online:2022-03-25 Published:2022-04-02
  • Contact: LV Xin

摘要:

为了探究利用数码图像处理技术诊断棉花氮素营养的最佳图像特征参数和最佳叶位,以‘新陆早53号’为材料,使用智能手机获取棉花不同叶位叶片图像,利用数字图像处理技术提取叶片图像颜色和纹理特征参数,分析叶片氮含量和特征参数的相关性,构建基于不同图像特征参数的氮含量估测模型。结果表明:颜色特征参数rG/(B+R)、G/B和纹理特征参数CORASM与叶片氮含量相关性较好,相关性系数(r)均大于0.55。基于颜色-纹理综合特征参数构建的氮含量估测模型均优于基于颜色或纹理特征参数所建模型,其中倒4叶氮含量估测模型最优,模型决定系数(R2)为0.875、均方根误差(RMSE)为1.324、相对误差(RE)为8.09%。因此,利用数字图像处理进行棉花氮素营养诊断时,应选择的最佳图像特征参数为rG/(B+R)、G/BCORASM,应选择的最佳叶位为棉花倒4叶。

关键词: 棉花, 数码图像, 氮素营养诊断, 颜色特征参数, 纹理特征参数

Abstract:

In order to study the best image characteristic parameters and leaf position for diagnosing cotton nitrogen nutrition by digital image processing techniques, the cotton variety ‘Xinluzao53’ was used as the material, and the leaf images in different leaf positions were obtained by smartphone. The color and texture characteristic parameters of cotton leaf were extracted by digital image processing techniques, the correlation was analyzed between nitrogen content in leaves and characteristic parameters, and the estimation model of nitrogen contents was established based on different characteristic parameters. The results showed that the color characteristic parameters r, G/(B+R) and G/B, and texture characteristic parameters COR and ASM had good correlation with leaf nitrogen content, and the correlation coefficients (r) were all greater than 0.55. The estimation models of nitrogen contents in different leaf positions based on the color-texture comprehensive characteristic parameters were better than the models based on the color or texture characteristic parameters. Among them, the nitrogen content estimation model of the 4th leaf from the bottom was the best, the model determination coefficient (R 2) was 0.875, the root mean square error (RMSE) was 1.324, and the relative error (RE) was 8.09%. Therefore, when using digital image processing for cotton nitrogen nutrition diagnosis, the best image characteristic parameters should be selected as r, G/(B+R), G/B, COR, ASM, and the best leaf position should be the 4th leaf from the bottom.

Key words: cotton, digital image, nitrogen nutrition diagnosis, color characteristic parameters, texture characteristic parameters

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