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Abstract
Image segmentation is a process of partitioning an image into subparts or segments. It helps the users to extract the region of interest from the whole image. Segmentation of the brain image plays a crucial rule in the diagnosis of brain tumor. But the major problem is that MR images of a brain also contain noise, discontinuities and inhomogeneities. So it becomes hardwon to segment a brain image into tumor region and healthy tissues. We have presented the review on origin of MRI, normalization of MRI and various brain tumor segmentation techniques.