ACTIVE CONTOURSWITHOUT EDGES

1 ACTIVE CONTOURS WITHOUT EDGES Chan and Vese [1] proposed an approximation for the MS segmen tatio model by following the level-set based curve evolution formulation [2, 3]. Level sets provide an implicit contour representation where an evolving curve is represented with the zerolevel line of a level set function (Figure 1). The basic aim of Chan and Vese (CV) model is to partition a given image into two regions that are likely to correspond object and background regions by embedding the object boundary by the z ero-level curve of a 3D level set function. Let φ be a level set function. Then, the Chan-Vese functional is ECV(c1, c2, φ) = λ1 ∫