Contrast Enhancement of MRI Images: A Review

In this paper, we study and compare various histogram based Magnetic Resonance Imaging(MRI) enhancement techniques.Image enhancement is a processing on an image in order to make it more appropriate for certain applications. It is used to improve the visual effects and the clarity of image or to make the original image more conducive for computer to process. Contrast enhancement changing the pixels intensity of the input image to utilize maximum possible bins. We need to study and review the different image contrast enhancement techniques because contrast losses the brightness in enhancement of image. By considering this fact, the mixture of global and local contrast enhancement techniques may enhance the contrast of image with preserving its brightness. Generally, MRI images are having low contrast. It may be difficult for analysing because of lack of detailed information. Contrast of MR images can be increased by number of ways in image processing. Histogram based techniques are used to enhance all types of medical images. Keywords— MRI, medical image processing, contrast enhancement, histogram, histogram equalization.