用LCTF光谱技术提取甘蓝小菜蛾虫害叶片特征波段  

Extract feature bands of cabbage leaves damaged by diamondback moth pests using LCTF spectroscopy technology

作　　者：林立波[1] 李宏宁 曹鹏飞[1] 冯洁[1] 

机构地区：[1]云南师范大学物理与电子信息学院,云南昆明650500

出　　处：《光学仪器》2014年第3期194-197,共4页Optical Instruments

基　　金：国家自然科学基金资助项目(60968001;61168003);云南省自然科学基金项目(2009CD047;2011FZ079);云南省大学生创新创业训练计划项目(201210681005;201310681004)

摘　　要：利用由液晶可调滤波器（liquid crystal tunable filter,LCTF）和单色CCD相机组成的光谱成像系统对甘蓝正常叶片和遭受小菜蛾虫害甘蓝叶片的光谱特征进行分析,获取了430～720nm每隔5nm波段的灰度值信息,并采用自适应波段选择方法提取出了两种叶片的特征波段,通过欧氏距离聚类方法对所提取的特征波段进行聚类分析。结果表明甘蓝正常叶片在545nm、645nm、650nm、655nm波段具有较大光谱信息量,而虫害叶片在550nm、555nm、575nm、585nm、715nm波段有较大光谱信息量。因此,可以利用LCTF快速地检测出植物是否遭受虫害,为农业虫害检测提供了一种新方法。Using liquid crystal tunable filter（LCTF）and monochrome CCD camera composed of spectral imaging system analyzed normal cabbage leaves and cabbage leaves damaged by diamondback moth pests spectral feature to acquire the gray value information of leaves from430nm to 720nm at intervals of 5nm,and it has extracted the feature bands of two kinds of leaves by the way of adaptive band selection method,these feature bands are to make cluster analysis using Euclidean distance.The result showed that normal cabbage leaves at 545nm,645nm,650nm,655nm are with a large of spectrum information,and pest leaves at 550nm,555nm,575nm,585nm,715nm have great amount of information.Therefore,it can be concluded that using LCTF can quickly monitor plant subjected to pest damage,which provides a new method to detect pest in agriculture.

关 键 词：液晶可调滤波器 自适应波段选择 特征波段 甘蓝叶片 小菜蛾 

分 类 号：TH744[机械工程—光学工程]