Abstract: In the classical level set method of implementing geodesic active contours model，upwind scheme is adopted.It needs small time step and re-initialization for every few iterations，so it is inefficient.Accordingly，this paper introduces a variational level set method based on geodesic active contours.Through introducing an enforcement for level set function，re-initialization is never needed.By experiment，the result shows that this method is effective and stable.

Key words: Geodesic Active Contour（GAC）, variational level set method, curve evolution

摘要： 传统的实现测地线活动轮廓（Geodesic Active Contour，GAC）模型的水平集方法中，采用迎风方案作数值求解，需要使用足够小的时间步长，在曲线演化的过程中需要重新初始化，故效率低，据此，给出一种基于测地线活动轮廓模型的变分水平集方法，引入了一个水平集函数的强制项，避免了重新初始化，简化了初始化的工作，通过实验证明了这种方法是有效的，稳定的。

关键词: 测地线活动轮廓模型, 变分水平集方法, 曲线演化