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Abstract: The new active contour model for grayscale image segmentation is proposed in this#br# paper. This model bases on the theory of fluid statics. The principle of fluid statics is used to drive#br# the continuous curve which surrounds the objects in a grayscale image. This model is able to#br# segment multiple objects, and able to segment the objects which are in the interior of another object#br# in a grayscale image. This model can control the over-segmentation.#br# Key words: grayscale image segmentation; active contour; fluid statics