微光数字观瞄镜的强杂光抑制技术研究

Research on Strong Stray Light Suppression Technology ofLow⁃Light Level Digital Sighting Telescope

针对观瞄镜强杂光干扰问题,提出一套完整的强杂光抑制技术方案。首先,对物镜内表面采用绒布消光;然后,在软件图像处理上结合使用相邻图像累加积分、直方图统计和宽动态灰度增强等算法完成强杂光抑制;在天空照度为1×10^(-3)lx以下的野外暗夜环境下,加入强杂光干扰后进行实验测试。实验结果表明,该技术方案能有效完成强杂光抑制和图像细节增强,提升图像质量。软件算法在FPGA(Field Programmable Gate Array)平台上运行,2 ms内完成图像处理工作,满足实时性要求。

The low⁃light level digital sighting telescope encounters strong stray light interference,which causes imaging overexposure and submerges useful information in the image.To address this issue,a set of strong stray light suppression technology solutions is proposed.First,absorbance flannelette is pasted to the inner surface of the objective lens,and then several algorithms such as cumulative integration of adjacent images,histogram statistics,and wide dynamic gray enhancement are used in software image processing to suppress strong stray light.In outdoor environments with night sky illumination below 1×10-3 lx,the experiment is conducted with added strong stray light interference.The results show that the technical solution can effectively suppress strong stray light and enhance image details,thereby improving image quality.The software runs based on FPGA(Field Programmable Gate Array),with a maximum processing time of 2 ms,meeting the real⁃time requirements of the system.