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Image enhancement (IE) is the process of enhancing visual appearance of image in order to make it more effective for computer to process. The look and visibility of image rely on human eyes, which vary from one person to another. Several enhancement methods are used to improve the clarity of image, but different application require different types of techniques for enhancing image quality. In this review paper, we present different enhancement techniques categorized into spatial and frequencydoi:10.22214/ijraset.2017.10057 fatcat:uws7nuxdpraoncs5p4r5mmf6fa