Scene simulation for LLL night vision system based on daytime image

On the basis of optoelectronic imaging technique, the imaging process of low light level (LLL) night vision system is analyzed. The characteristics of LLL image are discussed in aspects of imaging process and gray level distribution. A imaging modal of ICCD LLL imaging system and a mathematics model to convert daytime image to LLL image are constructed by using spectral integral. The imaging model is composed of scenery reflectance sub-system, atmosphere transmission sub-system and ICCD camera sub-system. Because every scenery has different spectral reflectivity, so do image segmentation first. After abstracting different scenery from daytime image and assigning them their corresponding spectral reflectivity, do integral calculations using the constructed imaging model. Thus the LLL image is generated after gray calculating and the scene simulation of LLL imaging system based on day image is implemented. The experiment results show that the constructed LLL imaging model is effective and the scene simulation is successful. The original daytime image and the generated LLL image are also presented in this paper.