摘要
土壤表层含水率是影响作物生长的重要因素,在节水灌溉控制系统中对其进行在线检测尤为重要。运用计算机数字图像处理技术,探索一种土壤表层含水率在线检测的新方法。通过土壤表层图像的中值滤波、图像模式转换和"坏区"过滤,提取图像的特征参数——灰度值,并对土壤表层图像的灰度值与其含水率的关系进行了试验研究。理论分析与试验结果表明,土壤含水率的百分比与土壤表层图像的灰度值之间是一种近似线性的函数关系。
Soil moisture content is an important factor of influencing crop＇s growth. It is very important that the moisture content is measured online in water-saving irrigation control system especially. By application of computer digital image processing technique, a method for measuring soil moisture content online is put forward. After median filtering, image mode transforming, and ＂bad area＂ filtrating to images of soil layer, the authors extract the characteristic parameter of a image, that is gray-value, and carry out experiments on the relationship between the gray-value of soil layer image and the soil moisture content. The theoretical analysis and the experimental results show clearly that there is an approximate linear function relationship between the percentage of soil moisture content and gray-value of soil layer image.
出处
《农业工程学报》
EI
CAS
CSCD
北大核心
2007年第10期57-61,共5页
Transactions of the Chinese Society of Agricultural Engineering
关键词
土壤含水率
在线检测
恒虚警
图像模式转换
中值滤波
soil moisture content
online measurement
invariable false alarm rate
image mode transform
median filtering
作者简介
张荣标，教授，主要从事农业电气化与自动化研究。镇江江苏大学电气信息工程学院，212013。Email：zrb@ujs．edu．cn
