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基于中波制冷320×256红外焦平面探测器,设计了以FPGA为处理核心,集SDRAM存储器及其他功能模块电路为一体,适用于时间分割型偏振成像系统的高速成像处理模块。处理模块主要由前端与探测器相连的驱动板、以FPGA为核心的处理板和系统电源板等组成,实现了盲元补偿、非均匀性校正、平台直方图均衡、线性映射等算法和校正参数的在线计算,具有内外同步可切换、积分时间连续可调的功能,能够输出分辨率为320×256像素、帧速为200fps的高质量红外图像,满足偏振成像系统对运动目标的实时探测要求。采用旋转偏振片的方法对带凹槽塑料水杯开展偏振成像实验,提取出有效的Stokes参量图像,观察到显著的偏振特性。该处理模块可广泛用于空间目标探测、地雷探测、海上搜救及伪装目标的探测等领域。
A high-speed imaging processing module based on mid-wave cooling 320 × 256 infrared focal plane detector with FPGA as the processing core, integrated SDRAM memory and other functional module circuits is designed and applied to the time-partitioned polarization imaging system. The processing module mainly consists of a driver board connected to the front end, a processing board with a FPGA core, a system power board, and the like, and realizes blind offset compensation, nonuniformity correction, platform histogram equalization, linear mapping and other algorithms and correction parameters Of the online calculation, with internal and external synchronization can be switched, the integration time continuously adjustable function, capable of outputting a resolution of 320 × 256 pixels, the frame rate of 200fps high-quality infrared images to meet the requirements of real-time detection of moving targets of the polarization imaging system. Polarization imaging experiment was carried out on a plastic cup with a groove using a rotating polarizer method to extract effective Stokes parameter images and observe significant polarization characteristics. The processing module can be widely used in space target detection, landmine detection, maritime search and rescue and camouflage target detection and other fields.