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In image processing and computer vision, snake (active contour model) is an effective tool in implementing brim detection or contour extraction of object. But the snake algorithm has the deadly shortcoming - the result is affected by the origin position. In this paper, proposed a new modified algorithm combining centric algorithm into the snake algorithm, so get the priority information of the origin position. The algorithm reduces sensitivity to initialization while providing superior performance. Finally the results of the computer simulation show the advantage of the new algorithm.