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In order to overcome the shortcoming in over-segmentation of traditional watershed algorithm, this paper presented an improved image segmentation method, which is having performance advantage of watershed, median filter and normalized cuts. Firstly, an improved median filter is applied to reduce the image noise. Secondly, watershed transform is used to pre-segmentation. Finally, normalized cuts is employed to deal with detail segmentation. Segmentation experiments show that this method which contains good performance of the three steps, can not only effectively avoid the over-segmentation of watershed, but also reduce the time complexity of normalized cuts.