REVIEW OF UNDERWATER IMAGE ENHANCEMENT TECHNIQUES
Sonam Bharal · 2015
Image enhancement is the process of improving the quality of the input image so that it would be easily understood by viewers in the future. Image enhancement improves the information content of the image and alters the visual impact of the image on the observer. Image enhancement intensifies the features of images. It accentuates the image features like edges, contrast to build display of photographs more useful for examination and study. Image enhancement includes many operations such as contrast stretching, noise clipping, pseudocoloring, noise filtering etc to improve the view of images. Active range of the chosen features of images is amplified by enhancement so that they can be detected simply. Underwater images mainly suffer from the problem of poor color contrast and poor visibility. These problems occurred due to the scattering of light and refraction of light while entering from rarer to denser medium. Scattering causes the blurring of light and reduces the color contrast. These effects of water on underwater images are only not due the nature water but also because of the organisms and other material present in the water. Many techniques and methods are established by researchers to solve the problem of underwater image enhancement. In this paper different underwater image enhancing techniques are reviewed and studied. The overall objective is to explore the shortcomings in earlier techniques.