Image segment plays an important role in the field of image processing

and currently the hybrid approach combining the manual and automatic methods is widely used in segment practice. In this paper we present an algorithm capable of locating the target object contour of sharp tips accurately in the interactive rate. Considering that the edge are usually on the zero-crossing points after Marr transformation for most images

existing techniques tend to give undesirable results because the energy path containing more points is given less priority. In our method we specify a pointer to point the current point on a path of interest

when the energy of current path is less than the energy for the previous point

we checknlatest points in the current path instead of checking only one point as existing techniques do

and

if more thanmpoint (m n) is zero-crossing

the pointer of the point is updated

otherwise

the pointer remains unchanged. Using this criterion we can insert new seeds automatically near the tips of the target object and the burr is eliminated by a vectorization approach. The final contour traced out fits the feature of the target object well and the effectiveness of our method is demonstrated by examples shown in the paper.