Mumford-Shah model

which has better ability to segment images

had been used to segmenting images or tracking targets.But it needs computing all the data of the image constantly during the iterative course

so it is not suitable for real-time application for its low efficiency.Aiming at this disability

by using the characteristic of the MRI

a fast method of solving the M-S model is improved based on the histogram method.This method first construct a signed table

which can be used to distinguish the area inside or outside of the edges

and use the histogram method to get the rough results

then use the searching method to optimize the results and get the final edges.Experimental results show that the new model can get the better results in an efficient way.