6I.Ituen,G.Sohn,and A.Jenkins.A case study:workflowlanalysis of powerline systems for risk management[J].The Imernation Archives ofthe Photogrammetry,Remote Sensingand Spatial.Information Sciences,2008,37(3):331-336.
7D.I.Jones and G.K.Earp,Camera sightline pointing require-ments for aerial inspection of over head power lines[J].Electric Power Sys-tems Research,2001,57(2):73-82.
8Appelt P.J.,Goodfellow J.W.Research on how trees cause interruptions-applications to vegetation management[J].IEEE RuralElectricPower Conference.2004(23/24/25):1-10.
9Zhengrong Li.Towards automatic power line detection for a UAV surveillancesystem using pulse coupled neural filter and an improvedHoughtransform[J].Machine Vision and Applica-tions,2010,21(5):677-686.