基于图像的植物叶面雾滴接触角稳定区间法测量  

Stable Interval Method Based on Images to Measure Drop Contact Angles on Plant Leaf Surfaces

作　　者：邱白晶[1] 赵晓丽[1] 贾卫东[1] 张振磊[1] 

机构地区：[1]江苏大学现代农业装备与技术江苏省重点实验室,镇江212013

出　　处：《农业机械学报》2009年第5期139-144,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(30571240);"十一五"国家科技支撑计划资助项目(2006BAD28B.05);国家"863"高技术研究发展计划资助项目(2008AA100905;2006AA10A305-3);江苏省自然科学基金资助项目(BK2008229)

摘　　要：发展了单侧液滴轮廓拟合生成接触角的方法,提出了接触角稳定区间概念,建立了拟合函数选优和拟合像素数选取的数值试验方法。本文方法与轴对称积分法相比,偏差为1.92%。但本文方法没有引入轴对称条件,因而可测非对称液滴接触角。对桂花叶上去离子水滴接触角的测量研究表明:可用三阶多项式在像素数区间[110,160]上拟合生成接触角;主叶脉方向和与之垂直的方向之间接触角差异明显,均值相差7.15°,同一方向上左右接触角均值相差1.33°。The measurement method was developed for determining contact angle by ~fitting drop profile. The concept of contact angle＇s stable interval was put forward, and a numerical experiment method for the optimization of fitting functions and fitting pixel numbers was established. The presented method was compared to the axisymmetric integral method, with contact angle deviation 1.92 %. Because the axisymmetric condition was not introduced in this method, it can be used to measure contact angles of non-axisymmetric drops. The contact angles of deionized water on Osmanthus fragrans leaves were measured, and the research results show that： three degree polynomial can be used to fit the drop profile in the pixel number interval and determine contact angle; the contact angles between the principle vien direction and the direction perpendicular to it are obviously different, with the average discrepancy 7.15°, the average discrepancy of left and right contact angles on the same direction is 1.33°

关 键 词：雾滴 叶面 接触角 测量 图像处理 数值方法 

分 类 号：S447.11[农业科学—农业昆虫与害虫防治]