差分阈值致冷红外系统冷反射校正法

Correction Method of Narcissus Effect of Cooled Infrared System Based on Differential Threshold

致冷红外系统的设计无法避免冷反射问题,通常需要复杂化光学系统来减弱冷反射的影响。通过分析致冷红外系统的冷反射特性,提出差分阈值冷反射校正法,可以放宽光学设计阶段对冷反射的限制,不用特意考虑冷反射。系统优化完成后进行光线追迹,以模拟真实场景中的冷反射现象,再通过本方法消除冷反射。设计了致冷红外光学系统,采用该方法处理后,从主观上看,图像明显清晰,从客观上看,多个图像质量评价函数均有所提高。结果表明,该方法可以有效减弱致冷红外系统冷反射,简化光学系统设计,对系统小型化、轻量化具有重要意义。

The design of the cooled infrared system can not avoid the problem of cold reflection,so it is necessary to complicate the optical system to weaken the influence of cold reflection.By analyzing the cold reflection characteristics of the cooled infrared system,the differential threshold cold reflection correction method is proposed,which can relax the restrictions on the cold reflection in the optical design stage,without considering the cold reflection.After the system is optimized,ray tracing is carried out to simulate the cold reflection phenomenon in the real scene,and then the cold reflection is eliminated by this method.A cooled infrared optical system is designed.After using this method,the image is clear subjectively,and many image quality evaluation functions are improved objectively.The results show that this method can effectively reduce the cold reflection of the cooled infrared system,simplify the design of the optical system,and is of great significance to the miniaturization and lightweight of the system.