Underwater Optical Observation, How to Improve Visibility

Computer vision is an interdisciplinary field that deals with how computers can be made for gaining high-level understanding from digital images or videos. Fish detection and monitoring is an important topic in computer vision. The growth of high-powered computers, the evolution of high-quality video cameras with low cost and the growing need for automated video analysis have caused more interest in the development of underwater inspection. However, in the sea, the spread of light and sound are not uniform. Therefore, visibility becomes increasingly difficult due to the physical properties of the water. This fact affects negatively of detection accuracy. In this paper, we present method for underwater image enhancement. Dark Channel prior, will be responsible to adjust colour channels in order to get more visibility in images. The algorithm is tested to many images. Experimental results demonstrates a good quality improvement in underwater images.