Li等人提出了一种无须重新初始化的水平集演化方法，更准确的说，可以称为距离保持的水平集演化。它针对于传统的水平集曲线演化理论的缺点，提出了一种新的几何活动轮廓的变分方法-Li put forward a kind of need to initialize level set evolution method, more accurately, can maintain the level set evolution of called distance. It in view of the shortcomings of the traditional level set curve evolution theory, this paper proposes a new geometric active contour of the variational method