中文摘要：

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。

英文摘要：

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.