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时间:2020-04-24
《基于机器视觉的羊体体尺测量-论文.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、JournalofComputerApplicationsISSN1001—90812014—03.10计算机应用,2014,34(3):846—850,887CODENJYIIDUhttp://www.joca.cn文章编号:1001。9081(2014)03—0846.05doi:10.11772/j.issn.1001—9081.2014.03.0846基于机器视觉的羊体体尺测量江杰,周丽娜,李刚(内蒙古科技大学信息工程学院,内蒙古包头014010)(通信作者电子邮箱zlncandy1230@163.COn1)摘要:体尺参数是评价羊生长状况的重要指标,如何实现其无应激测量是羊养殖过程中
2、亟需解决的重要问题。引入机器视觉相关方法,运用基于灰度的背景差分法,结合色度不变性原理,从复杂环境中检测羊体,并借助栅格法,提取羊体上轮廓包络线;采用D—P算法和海伦一秦九绍公式对轮廓序列进行分析,获取包络线最大曲率点,并以此作为羊体臀部测点;在此基础上,采用四点法求取羊体的其他3个测点,结合空间分辨率,得出羊体的体尺参数,实现无接触测量。实验结果表明,所提方法可以有效从复杂环境中提取出羊体;羊体臀部测点可以有效稳定地确定,羊体身高可稳定获取;由于环境光线的复杂性,肩胛点的确定仍存在一些问题。关键词:体尺测量;背景差分法;阴影抑制;测点提取;机器视觉中图分类号:TP391.413文献标志码:
3、ASheepbodysizemeasurementbasedoncomputervisionJIANGJie,ZHOULina,LIGang(SchoolofInformationEngineering,InnerMongoliaUniversityofScienceandTechnology,BaotouNeiMongol014010,China)Abstract:Bodysizeparametersareimportantindicatorstoevaluatethegrowthstatusofsheep.Howtoachievethemeasurementwithnon—stressi
4、nstrumentisanurgentandimportantproblemthatneedstoberesolvedinthebreedingprocessofsheep.Thispaperintroducedcorrespondingmachinevisionmethodstomeasuretheparameters.Sheepbodyincomplexenviromnentwasdetectedbygray—basedbackgroundsubtractionmethodandchromaticityinvarianceprinciple.Byvirtueofgridmethod,th
5、econtourenvelopeofsheepbodywasextracted.AfteranalyzingthecontoursequencewithD—PalgorithmandHelen—QinJiushaoformula,thepointwithmaximumcurvatureinthecontourwasacquired.Thepointwaschosenasthemeasurementpointatthehipofsheep.Basedontheaboveinformation,theotherthreemeasurmentpointswereattainedusingfour—
6、pointmethodandcombingthespatialresolution,thebodysizeparametersofsheepbodywereacquired.Andthecontactlessmeasurementwasachieved.Theexperimentalresultsshowthat,theproposedmethodcaneffectivelyextractsheepbodyincomplexenvironment;themeasurementpointathipofsheepcanbestablydeterminedandtheheightofsheepca
7、nbestablyattained.Duetothecomplexityoftheambientlight,therestillexitssomeproblemswhendeterminingtheshoulderpoints.Keywords:bodysizemeasurement;backgroundsubtractionmethod;shadowsuppression;measuringpointext
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