自定义窗口的红外成像系统设计

红外焦平面探测器已经迅速成为红外成像领域的主流器件。针对某些红外跟踪装置模拟器需要使用诸如 320×256、128×128、64×64 等多种像元数的特殊要求，系统通过利用探测器自定义窗口工作模式的功能来满足该需求。探测器偏置电压由高精度电压参考源实现，外围电路采用低噪声设计技术，输入输出的数字信号均进行光电隔离。系统以 FPGA 为核心，实现了探测器基本时序控制、窗口模式设置、数字视频接口、RS422 接口、模数转换和视频显示等功能，完成了自适应非均匀性校正、自动盲元剔除、图像增强和灰度拉伸映射等算法，可以同时满足观测和算法验证等多种需求。

Abstract

IRFPA is becoming the leading device in the infrared domain rapidly. Some tracker simulators need to use special image pixels, such as 320×256, 128×128 and 64×64. This paper proposes a method which uses the detector’s user-defined window mode to satisfy this requirement. It uses precision voltage reference to realize the bias voltage, and uses low noise technology to design the peripheral circuit. All the digital input and output signals are insulated by HCPL0630. It uses FPGA as a core to realize functions of interface control, user-defined window mode, digital video interface, RS422, analog to digital conversion, video display and algorithms of NUC, and automatically dead pixel elimination. It can be used in many fields, such as monitoring and algorithm proving.

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