Data mining techniques are widely used for data processing from large data set such as data center and data warehouse. An Image mining technique is a new form of data mining technique in the processing of image data. In the medical field, day by day size of medical images data is increasing. MRI images are one of them. The medical images like as CT scan, MR images are widely used in brain tumor detection, cancer detection from the human body. It is quite challenging and complicated work to detect abnormal cells and tissue such as tumor from MR image data sets. Due to higher importance and de medical image data, it is necessary to process it correctly and efficiently. Image Segmentation has an important role in the field medical image processing. In that way, MRI has become a useful medical diagnostic tool for the diagnosis of brain & o medical images.