A New Level Set Method for Image Segmentation Based on Snake Model
Jiwen Wang · Computer Technology and Development · 2008
In this paper,we introduce a new variational function that approximate to the SDF(signed distance function) in standard level set methods and needs less calculation time,and therefore completely eliminates the steps of re-initialization during the contour evolution.Use an energy function to express the change of the level set function based on the snake model(active contours).The function is composed of the internal energy and the external energy.The internal energy describes the tensility and the smoothness of the contour;the external energy could be got a minimum value besides the boundary of the object depending on the image data.Making the internal and external energy got a minimum value at the same time.It will produce internal force and external force: the internal force controls the direction of the contour evolution and keeps the degree of the curve variation;the external force draws the contour to the boundary of the object.