The Simulation And Research Of Underwater Light Field Under Unknown Radiative Transfer

In the 21 st century,with the development of the social economy,people are increasingly aware of the importance of the ocean to people's lives.In recent years,the research of marine resources development,marine environmental protection and marine military applications and other aspects are attracting people's attention.Light is the important means of underwater resource detection and environmental protection,which mainly related to underwater lighting and three-dimensional image simulation,underwater light field simulation and visible light detection algorithm research has become the hot spots of the underwater vision and underwater image processing.Based on the real-time simulation of underwater light field under unknown radiative transfer,this paper only relies on the sampling information of adjacent light in the horizon,on the basis of the problem that underwater light field lighting rendering in determined field,we need to combine the theory of optical radiative transfer,but which has drift characteristics due to the influence of currents and the property of salinity,temperature.Therefore,the optimal estimation theory of nonlinear uncertain system is adopted,and the ocean wave fluctuation theory is used to study the sampling light field simulation algorithm under unknown conditions of optical radiative transfer.For the study of oceanic underwater light field,we first need to analyze the theoretical basis of underwater light field,understand the characteristics of underwater optics,and then introduce the theory of radiative transfer of light,the Monte-Carlo radiative transfer equation of light field is established.The radiative transfer algorithm of the light field is modeled and simulated by using the radiative transfer information of the photon in the water.Secondly,the precise modeling of the oceanic fluctuating light field can not abandon the constraint of the property of salinity,temperature of the sea water and can not be transformed into a no-drift system,therefore,the position of the fluctuating light field needs to be estimated.According to the Stokes theory,the model of sea wave is established,and the least square method is used to fit the measured oceanic refractive index data according to the interpolation method,a multi-parameter seawater refractive index model is obtained.Then the entropy weight analysis method is introduced to establish an evaluation system of underwater light field decay to realizethe visual simulation of the underwater two-dimensional and three-dimensional light field,and the spatial position is estimated.Finally,due to ocean currents show a variety of uncertainties,such as constant known,constant unknown,time-varying known,time-varying unknown,size changes,direction changes.Therefore,combined with radiative transfer simulation method and ocean dynamics equation,based on nonlinear uncertain theory,optimization theory,system qualitative simulation theory and adaptive parameter estimation,Through the analysis of theory and simulation,we do research for the uncertainty of parameters and different characteristics of ocean current estimation.The robustness and positioning accuracy of the flow field radiation calculation are studied to realize the visualization of the optical graphics in the flow field.