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 s