说明：  采用各向异性方法 填补一个缺损的轮廓，从而可以得到一个光滑完整的轮廓。
( Completed contours correspond to ridges of an extension (ext) of the characteristic function of the uncompleted curve. Anisotropic extension is performed on the characteristic function fbound of an image set given by the binary map boundary to the whole image domain. Extension is initially driven by \xi=(EigVect{1}, EigVect{2}) (which should match with the contour tangent direction) computed as the direction of maximum coherence of the distance map to the contour to close. It is updated every N iterations with DCV over the distance map to the ridges/thinning of the evolved image. Two different stop criteria are supported: Number of Connected Components ( numcomp ). Contour Completion. Stop when the extended contour (curve of level 1) has exactly Ncomp connected components. Difference between two consecutive iterations ( tol ) Speed Stabilizes ( speed_stab ). [extended]=ContourCompletion(BoundCond,f,DCVParam,StopParam,SaveParam) )