THE RESTRAINT OF BACKSCATTER AND SMALL-ANGLE FORWARD SCATTER NOISE FOR UNDERWATER LIGHT IMAGE

The paper firstly analysed the character of underwater light image——very low contrast and resolution.The main factors affecting the quality of underwater light image are backscatter and small-angle forward scatter.A mathematical model of underwater light image was built.Then a special adaptive enhancement filter was analysed and devised for such image.The algorithm has three shortcomings:(1)"ring"response;(2)"salt and pepper"noise;(3)simultaneous enhancement of high frequency noise and image details.But our improved adaptive enhancement filter algorithm,as shown by experiment,has surmounted them.