Visible Light Hyperspectral Imaging Simulation Of Ground Targets In Complex Background

This paper establishes the scattering characteristic model of ground target in complex background by using ray tracing algorithm.We have established a hyperspectral imaging model of complex backgrounds of surface features,then hyperspectral imaging simulation of typical scenes is realized.The main work and achievements of the thesis are as follows:Firstly,In the calculation of scattering characteristics of ground targets in complex background,we discuss the composite scattering method between ground and target,so that the scattering model of complex targets is applied to the calculation of composite scattering characteristics between ground and target.It is found that for a wide range of ground background,the scattering of the composite target has little effect on the scattering intensity of the overall scene because of the strong diffuse reflection characteristics of the ground.We use the random sampling method in the upper half space to simulate the sky atmospheric radiation for sky atmospheric background radiation.It is found that the influence of the sky background in the visible light band is relatively large,accounting for about fifteen percent at 400 nm.This paper implements complex background scene imaged single wavelength and achieves the objectives ground visible hyperspectral imaging simulation based on the spectral characteristics.Secondly,in the calculation of scattering characteristics of ground targets in complex background,we discuss the composite scattering method between ground and target,so that the scattering model of complex targets is applied to the calculation of composite scattering characteristics between ground and target.It is found that for a wide range of ground background,the scattering of the composite target has little effect on the scattering intensity of the overall scene because of the strong diffuse reflection characteristics of the ground.We use the random sampling method in the upper half space to simulate the sky atmospheric radiation for sky atmospheric background radiation.It is found that the influence of the sky background in the visible light band is relatively large,accounting for about fifteen percent at 400 nm.This paper implements complex background scene imaged single wavelength and achieves the objectives ground visible hyperspectral imaging simulation based on the spectral characteristics.Finally,we optimize the ray tracing algorithm based on the octree structure,which greatly improves the efficiency of the algorithm.At the same time,we have established a CUDA parallel model based on ray tracing,which optimizes transmission efficiency by using texture memory and page-locked memory,further optimizes the program structure,and combines the advantages of large data volume parallel computing of CUDA architecture to improve the computational efficiency of the algorithm.