XRⅡ图像中这些标志物呈现为圆形，其检测可采用基于圆霍夫变换（Circle Hough Transform，CHT）的算法和取阈及连通分量（Connected Components，CC）分析相结合的算法两类。
基于4个网页-相关网页
fast circle Hough transform 圆快速霍夫变换
Local Circle Hough Transform 局部圆哈夫变换
hough-circle transform 霍夫圆变换
The HOUGH transform circle detection method involves complex computation, and needs to set some restrictions in advance, which have certain limitations for real-time traffic signs detection.
HOUGH变换圆检测法涉及复杂运算量，同时需要预先给定一些限制条件，对于交通标志的实时检测有一定局限性；
The HOUGH transform, round-degree method, and the corner detection method are the main circle detection methods.
主要研究了HOUGH变换圆检测法、圆形度法和拐角检测法。
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