红外图像模拟中的红外光学系统影响分析

基于红外成像原理对红外图像的模拟进行了分析,指出现有的红外图像模拟方法主要考虑被成像物的辐射能量分布以及红外探测器像元的视场划分,而忽视了热像仪光学系统对红外辐射信号的衍射效应,从而导致模拟的红外图像边界过于清晰与生硬,影响了模拟图像的逼真度.为考虑衍射效应对热图的影响,利用高斯点扩展函数对模拟热图进行卷积处理,结果表明:处理后的模拟红外图像细节更为逼真,有效的解决了模拟红外图像中边界过于明显的问题,在一定范围内提高了模拟红外图像与真实红外图像的相似程度.

Analysis of infrared optical system influence in infrared image simulation

Based on theory of infrared detection,the process of infrared image simulation is analysized in this paper.It is pointed out that the present simulation methods only take into account the effects of radiant energy distribution and view field partition of infrared detector pixel.Whereas the diffraction effec of optical system on infrared radiation signal is neglected,which results in very clear boundaries in simulated infrared image.In order to simulate the some what blurred boundary in real infrared images,Gaussian point spread function is used to convolve the simulated infrared image.By this way,the similitude between the simulated images and real infrared images is improved significantly.