对于小型化成像探测器,自动调光方法的有效与否直接影响后续的目标检测和跟踪效果。本文将亮度直方图的自适应调光方法和图像熵搜索方法相结合,提出一种新的基于嵌入式FPGA的自适应动态调光方法。由于FPGA的并行计算优势,各功能模块可以同时运行互不干扰,很好的满足了实时性的需求,同时给出了时序控制电路中的关键技术和成像实验。实验结果表明,该自动调光方法在多种光照条件下具有很好的环境适应性。

For small imaging detectors, the effectiveness of the automatic dimming method directly affects the subsequent target detection and tracking effect. A new adaptive dynamic dimming method based on embedded FPGA was proposed in this paper, which combined brightness histogram adaptive dimming method with image entropy search method. Because of the parallel computing advantage of FPGA, each function module could be running at the same time, and it met the need of real time. The key technologies in timing control circuit and imaging experiments were given. The experimental results show that the automatic dimming method has good environmental adaptability under a variety of illumination conditions.