自由空间中光信息传输模型下非线性JTC光学图像校正方法

Nonlinear JTC optical image correction method based on optical information transmission model in free space

JTC光学图像受外界环境因素影响导致图像质量受损的主要原因是光传输过程中光子受图像采集点与图像采集场景之间大气粒子的散射作用,基于此提出自由空间中光信息传输模型下非线性JTC光学图像校正方法。分析以Bouguer理论为基础的大气散射模型,针对其忽略光子前向散射部分的光辐射通量的缺陷,优化Bouguer理论,推导大气中直射与斜射散射光传输特性,构建自由空间中光信息传输模型,确定光信息传输方向上全部光通量经过散射被JTC接收的辐射照度。基于自由空间中光信息传输模型确定的辐射照度,取原JTC光学图像反色,利用改进型多尺度Retinex算法增强图像暗区域,再进行反色处理即可获取去除噪声后的JTC光学图像。实验结果显示本文方法校正后,JTC光学图像整体视觉效果清晰,原云层遮挡区域云层呈现多层次化,整体淡化,云层遮挡区域信息可被有效采集。

The main reason for the image quality damage of JTC optical image is that the photons are scattered by atmospheric particles between the image acquisition point and the image acquisition scene in the process of optical transmission.Based on this,a nonlinear JTC optical image correction method is proposed under optical information transmission model in free space.This paper analyzes the atmospheric scattering model based on Bouguer theory,optimizes Bouguer theory aiming at the defect of neglecting light radiation flux of forward scattering part of photon,deduces the transmission characteristics of direct and oblique scattering light in the atmosphere,constructs the light information transmission model in free space,and determines the irradiance of all the light flux in the light information transmission direction received by JTC after scattering.Based on the irradiance determined by the optical information transmission model in free space,the original JTC optical image is used to reverse color,the dark area of the image is enhanced by improved multi-scale Retinex algorithm,and then the JTC optical image after noise removal can be obtained by reverse color processing.The experimental results show that the JTC optical image has a clear overall visual effect after the correction of the method in this paper.The cloud in original cloud cover area presents multi-level,and the whole is diluted.The information of cloud cover area can be effectively collected.