基于广角摄影技术的柑橘树冠层叶面积指数检测系统  

Detecting System of Citrus Canopy LAI Based on Wide-angle Photographing Technology

作　　者：吴伟斌[1] 冯灼峰[2] 洪添胜 张立俊[2] 杜俊毅[2] 黄双萍[2] 

机构地区：[1]华南农业大学南方农业机械与装备关键技术教育部重点实验室,广州510642 [2]华南农业大学工程学院,广州510642 [3]国家柑橘产业技术体系机械研究室,广州510642

出　　处：《农业机械学报》2014年第8期276-281,共6页Transactions of the Chinese Society for Agricultural Machinery

基　　金：国家自然科学基金资助项目(30871450);现代农业产业技术体系建设专项资金资助项目(CARS-27);公益性行业(农业)科研专项经费资助项目(201203016);惠州市产学研结合项目(2013B050013015)

摘　　要：提出一种基于广角摄像技术的柑橘树叶面积指数快速、简易检测方法。将广角摄像镜头拍摄的柑橘树图像导入计算机,进行灰度化、图像增强、滤波处理与二值化处理,计算出柑橘树冠层的孔隙率,据此推导柑橘树冠层叶面积指数。试验以扫描法检测结果作为真实值,并以加拿大WinSCANOPY型冠层分析仪与本系统作检测效果对比,结果表明在同等试验条件下,利用WinSCANOPY型冠层分析仪检测柑橘树叶面积指数的相对误差变化范围为-30.39%~43.53%,相对误差绝对值的平均值为18.90%,本系统检测的相对误差变化范围为-27.26%~37.06%,相对误差绝对值的平均值为19.91%,满足柑橘树冠层LAI检测试验要求。An innovative way was proposed to detect citrus canopy LAI fast and easily based on wide- angle photographing technology. The citrus canopy images obtained by wide-angle lens were first sent into computer. And then the images were grayed, enhanced, filtered and binarized. The system calculated the citrus canopy gap fraction and derived LAI. The citrus canopy LAI detected by scanning method was taken as true value in the whole experiment. The Canadian WinSCANOPY was used in comparison with the system in detecting effect. The result of data collection experiment showed that the variation range of relative error was - 30. 39% - 43.53% and the average of absolute relative error was 18.90% by the Canadian WinSCANOPY. The variation range of relative error was - 27.26% ~ 37.06% and the average of absolute relative error was 19.91% by the system based on same test condition. This system meets test requirements of citrus canopy LAI detecting.

关 键 词：柑橘 叶面积指数 广角摄影技术 检测系统 图像处理 

分 类 号：TP317.4[自动化与计算机技术—计算机软件与理论] S314[自动化与计算机技术—计算机科学与技术]