FPGA design of video processing circuit based on 4Kx4K large array infrared detector

As the core component of the camera, infrared focal plane detector assembly is widely used in the field of aerospace infrared remote sensing because of its excellent performance in thermal image viewing, forward-looking early warning, prevention and control monitoring, infrared recognition and so on. Aiming at the 4kx4k large area array infrared video circuit spliced by four 2kx2k infrared detectors, firstly this paper considers the difficulties of piecewise adjustment of integration time and sampling point position delay compensation of spliced detectors from the perspective of FPGA. Then the design idea is given, including configuring and using management chip to reduce clock jitter and improve the reliability of data transmission; the functions of programmable adjustment of pixel blind coordinates and real-time inconsistency correction are realized, and the image quality is improved; using DDR2 to store inconsistency correction parameters; finally, the channel image data synthesis and transmission are completed. All functions such as focal plane control, signal processing and plug-in chip control are completed with one FPGA, which has the advantages of miniaturization and lightweight. The test shows that the design idea and scheme in this paper are feasible and practical, which provides reliable technical support for video signal processing of aerospace remote sensing large array detector, and is of great significance.