%0 Journal Article
%T An Automatic Approach for Detecting the Contours of Wheels<br>一种车轮轮廓的自动提取方法
%A TAN Bo-Yi
%A ZENG Hui
%A HU Zhan-Yi
%A <br>谭博怡
%A 曾慧
%A 胡占义
%J 自动化学报
%D 2008
%I 
%X The contours of wheels play an important role in the traffic accident analysis system.Their detecting precision will influence the measurement precision and the investigation quality directly.A new automatic detecting approach is proposed in this paper.As the contour of a wheel rim is easier to detect than the contour of a wheel,and the contour of a wheel rim and the contour of a wheel are approximately concentric circles on the same plane,we first detect the contour of the wheel rim,the center of the wheel rim and the contacting point between the wheel and the ground,then we detect the contour of the wheel via the invariance of cross ratio under projective transformation.Our extensive experimental results with real images under various weather conditions show that the proposed approach is capable of detecting contours of wheels robustly and automatically.
%K Wheel contour
%K wheel rim contour
%K concentric circle
%K projective transformation
%K cross ratio<br>车轮轮廓
%K 钢圈轮廓
%K 同心圆
%K 射影变换
%K 交比
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=8240383F08CE46C8B05036380D75B607&jid=E76622685B64B2AA896A7F777B64EB3A&aid=036E18FECF56DD234DC77347BE5EBBE0&yid=67289AFF6305E306&vid=339D79302DF62549&iid=94C357A881DFC066&sid=AF0641F74554D706&eid=91BAD12CFABB3251&journal_id=0254-4156&journal_name=自动化学报&referenced_num=0&reference_num=14