摘要
为了实现马铃薯的自动分级,设计了基于V型平面镜同时获取三面图像的马铃薯机器视觉分级系统,并提出了相应的分级算法。根据大小特性,提出基于最小外接柱体体积法的马铃薯大小分级检测方法;根据外形特性,采用最长径外接矩形的宽高比法,实现了类圆形、椭圆型以及长型马铃薯的分类;根据马铃薯缺陷特点,分别提出以缺陷面积大小作为判别准则的孔洞、干腐马铃薯判别方法,以外接矩形对角线长度作为判别准则的机械损伤马铃薯判别方法和基于交叉法的发芽、畸形马铃薯检测方法。最终马铃薯的分级正确率为91.0%。试验结果表明:基于机器视觉的马铃薯自动分级检测方法可行,可用于马铃薯外部品质的在线检测。
In order to realize grading of potato,a potato grading system based on machine vision was developed.Two pieces of plane mirror placed in V-shape were used to get three surface images of a potato at one time.Volume method based on minimum circumscribed cylinder was proposed to grade potatoes according to their size,the ratio of width and length of the longest diameter circum-rectangle was used to grade potatoes according to their shape.On the basis of characteristics of potato defects,defect area,diagonal length and cross method were used as criterions of the lacunary,dry rot,mechanical damaged,budded and misshapen potatoes.Experiments showed that the recognition accuracy of potato defects was 91.0%.The results indicate that the classification method has a high accuracy,and can be used for external quality online detection of potatoes.
出处
《农业工程学报》
EI
CAS
CSCD
北大核心
2012年第7期178-183,共6页
Transactions of the Chinese Society of Agricultural Engineering
基金
高等学校博士学科点专项科研基金(20090146110018)
湖北省自然科学基金重点资助项目(2011CDA033)
关键词
机器视觉
分级
在线检测
表面缺陷
马铃薯
computer vision
grading
online detection
surface defect
potato
作者简介
周竹（1984-），男，湖北汉川人，研究方向：智能化检测技术。武汉华中农业大学工学院，430070。Email：zhouzhuniba@163．com
通信作者：李小昱（1953-），女，河南叶县人，教授，博士生导师，中国农业工程学会高级会员（E041200068S），研究方向：智能化检测技术。武汉华中农业大学工学院，430070。Email：lixiaoyu@mailhzau．edu．cn
