Review on Enhancement of Underwater Images

Underwater vision is a significant issue in ocean engineering. Atmospheric images and underwater images undergo from medium scattering and light distortion, leading to the low contrast and visibility of images. However, there are some different characters of the underwater images. Firstly, catching pictures submerged is troublesome, because of the weakening caused by light that is reflected from a surface, and is avoided and scattered by particles. Meanwhile absorption substantially lessens the light energy. The irregular lessening of the light is the primary cause of the cloudiness appearance while the assimilation of light make the submerged pictures not quite the same as the air right of passage pictures since the splendor dispersion is completely changed. In this paper, an audit on underwater image enhancement is presented covering basic enhancement techniques, issues and challenges and existing algorithms for underwater image upgrade.