IMAGE ENHANCEMENT TECHNIQUES: A REVIEW

Brindha, Bharathi, Anusuya, Praiseline Karunya

Abstract: Field of image processing has vast applications in medical, forensic, research etc., It includes various domains like enhancement, classification, segmentation, etc., which are widely used for these applications. Image Enhancement is the pre processing step on which the accuracy of the result lies. Image enhancement aims to improve the visual appearance of an image, without affecting the original attributes (i.e.,) image contrast is adjusted and noise is removed to produce better quality image. Hence image enhancement is one of the most important tasks in image processing. Enhancement is classified into two categories spatial domain enhancement and frequency domain enhancement. Spatial domain enhancement acts upon pixel value whereas frequency domain enhancement acts on the Fourier transform of the image. The enhancement techniques to be used depend on modality, climatic and visual perspective etc., In this paper, we present a survey on various existing image enhancement techniques

Keywords: Enhancement, Spatial domain enhancement, Frequency domain enhancement, Contrast, Modality

DOI: https://doi.org/10.15623/ijret.2015.0405085