从主动光学成像系统的照明模型出发 ,研究了大视场情况下目标和景物的成像性质 ,分析了传输介质对照明和成像光束的衰减作用 ,得出了光学成像系统像面照度的计算公式 ,并对其衬比传递特性和视场大小对成像的影响进行了详细的分析 ,得出了小视场近似的条件 ,其结果可用于主动光学成像系统的设计、图像分析和目标识别 Based on the illumination model of the active optical imaging system, the imaging properties of the target and the scene under large field of view are studied. The attenuation of the illumination and imaging beam of the transmission medium is analyzed. The formula of image plane illumination of the optical imaging system is obtained, The effects of the contrast ratio and the field of view on the imaging are analyzed in detail. The conditions of the small field of view approximation are obtained. The results can be used in the design of the active optical imaging system, image analysis and target recognition