Research On Visual Computer Simulation Method Of Virtual Underwater Environment

Visualization of virtual underwater environment is a significant research topic.The scientific problems involved include water flow analysis and simulation,seabed terrain reconstruction,underwater object information extraction and three-dimensional reconstruction and other complex issues.Among them,water flow is very complex,so there is no better general method to simulate its flow.At present,the mainstream technology is still based on Newton's dynamic equation,however,it is very difficult to simulate real water flow,especially turbulence.On the problem of underwater object simulation,because of the particularity of underwater object images,there are many technical and theoretical problems to be solved in reconstructing underwater objects accurately by means of optical images and radar information.For example,the preliminary processing of images,extraction of information points,extraction of height information,image reconstruction based on a single image and so on.In this paper,a numerical calculation scheme for simulating water flow through obstacles is presented and a preliminary simulation experiment is carried out.The iteration equation is used to replace the dynamic equation,and the node time of eddy current and turbulence is observed during the iteration process.This iteration method is not simply to discretize and differentiate the dynamic equation,but to give the iteration expression according to the motion of fluid and the characteristics of trigonometric function,and to carry out preliminary simulation experiments according to the iteration expression.The experimental results are in good agreement with the initial state of vortex and turbulence formation.The Lax-Wendroff finite difference method for water wave simulation is improved,and a more stable and the exponential function in the algorithm is changed into trigonometric function or polynomial expansion function,and the increment is controlled by program statements,finally,a more stable and real water wave simulation pattern is drawn.Using program to control the fluctuation degree,when the fluctuation degree reaches a certain level,the reverse control,i.e.from large fluctuation to small fluctuation,achieves better simulation results.Harris feature point detection method is improved,and a large number of simulation experiments are carried out according to the specific environment,such as partitioning,changing threshold independently,and compared with the existing methods.An iterative method for extracting the edge information of underwater objects is presented.The image and auxiliary function are used to construct a chaotic system,and then the auxiliary function is discretized into a matrix.After normalization,the pixel value function is extracted by matrix subscript iteration,and then iterated as the subscript.The method is simple,fast and effective.Further work is to reconstruct 3D data based on comer information and image edge information,the extraction of corner depth information and edge information of multi-angle and multi-direction images is studied,and three-dimensional data reconstruction is carried out on this basis,and to study the simulation of water flow.There is also need for further study of water flow simulation,especially the simulation of turbulence.