在图象边缘检测中往往要求所检测到的边缘具有封闭特性，本文详细地分析了目前常用的两种算法：哈夫变换和Canny边缘检测算法，最后，探讨边缘算子应满足的准则。 -Edge detection in images is often requested by the detected edge with closed characteristics, this article detailed analysis of the current commonly used two algorithms: