微光景像匹配实时图模拟生成技术研究

景像匹配实时图模拟生成是导弹制导系统仿真和景像匹配算法验证的关键技术。研究了光照条件、气象条件、像增强型电荷耦合器(ICCD)相机特性以及地面光谱反射特性等因素对微光成像的影响,建立了微光视景像生成的数学模型,包括:地面反射特性模型、像增强型电荷耦合器相机特性模型、大气传输模型和噪声模型,研究了白天与夜间地面反射特性造成的日光图像与微光图像的衬比度差异,提出了微光景像匹配实时图仿真方案,并在此基础上研制了一个完整的蕴含LOWTRAN7计算内核和像增强型电荷耦合器后段仿真的微光景像匹配实时图生成系统。仿真实验结果说明了该方案的有效性。

Study on Real-Time Low-Light Level Image Synthesis for Scene Matching

Scene matching real-time image synthesis plays an important role in simulation of aircraft navigation and performance evaluation of scene matching algorithm. The factors affecting low-light level (LLL) imaging including the change of illumination, meteorology, the characteristics of ICCD camera and the ground spectral reflectance are investigated. Mathematical models of LLL scene simulation are established, including ground reflectance model, ICCD camera model, atmosphere transmission model and noise model. The contrast difference between daytime image and LLL image is studied and a LLL image simulation scheme is proposed. Then a whole real-time LLL image matching synthesis system oriented to ICCD camera is developed using the computing kernel of LOWTRAN7. Simulation result shows this scheme is valid.