The Affect About Scatter To Laser Underwater Imaging Clarity

Oceans cover 70% of the Earth's surface area, our country's coastline amounts to more than 18,000 kilometers, and the ocean economy has been brought into national economic development plans, the sea enterprise has moved towards take high-tech as a foundation, and take petroleum and marine transportation development as main symbol comprehensive development use stage.[1] Majority of our country submarine petroleum pipes line in continental shelf turbid water district, so the development of turbid water observation technology has already became one of the most important link in ocean development technology. It is necessary for the development of ocean resources to develop high-speed and real-scene underwater devices.Laser underwater imaging technology has acquired some achievements in the world, there are two means including range-gated technology and synchronous scanning technology. At present,the key is to resolve the scatter in laser underwater transmission in the existing underwater laser imaging technology. Even in the most pure water, there is very serious optical attenuation[1].Scatter is the main factor to affect the resolution of underwater imaging in turbid water, so it must to overcome the problem of scatter in order to enhance laser underwater imaging clarity.Our country offshore coast water's quality is muddy, in which there is serious scatter. The paper studied the characteristic of laser underwater transmission at first, and then analysis the affect about scatter to laser underwater imaging clarity, in order to process the pictures received by underwater imaging in the future. Now we mainly use PSF to process the pictures received by underwater imaging, but this method is not the best one. Therefore this paper talked about a method to measure the diffused angle of the picture received by underwater imaging, this method can provide the data for picture processing. It is studied by carrying on a series of experiments in the cistern. The results of experiments can proved that the method is right and feasible.