变量喷雾系统中果树冠幅检测方法研究

果树的变量喷雾系统要求快速实时地检测果树的冠幅，现有数字图像处理 检测果树冠幅存在不能实现实时检测且误差大或者不能检测果树实际冠幅值的问题，本文用 参照标准板与每株样本果树一起拍摄，通过求每张图像单位像素宽度的方法求取对应样本果 树的实际冠幅；再将采用该数字图像检测的果树冠幅与采用手持激光测距仪检测的冠幅标准 值作比较分析。试验结果表明：检测的50 株样本果树中，74%的样本数利用图像处理方法 所检测冠幅值与参考值的相对差值都小于20%，对果树冠幅数字图像检测值与标准值进行回 归分析，R2=0.7406，因此，在变量喷雾系统中采用图像处理方式检测果树冠幅是可行的。

A Method for Detecting Fruiter Crown Diameter in Variable-rateSpray System

A variable-rate spray system of fruiter needs real-time detection for the fruiter crown diameter. Existing digital image processing technology can not realize real-time detection for the fruiter crown diameter. The problem is that the detection error is large or no error can be detected. A reference standard plate with fruiters when capturing images is used to obtain the fruiter crown diameter by calculating image unit pixel width in this paper. Comparing with the reference crown diameter detected by the handheld laser rangefinder, test results show that 74% of the test sample of 50 fruiters have a relative difference of less than 20% between the crown diameters detected by the image processing method and the reference values. The regression analysis of fruiter crown diameter on digital image detection value and the reference one shows R2=0.7406.