Non-uniformity Correction For Infrared Image By Using FPGA

There is much non-uniformity in the infrared imaging system, especially in IR Focal Plane Array because of the limits of the detector's materials and the manufacturing technology. This causes the reduction of the distinguish ability of the image and the distance of the infrared imaging system. So real-time non-uniform correction is a key technique for the processing of the infrared signal.In this paper, a new, real-time and uniform two-point correction method for the infrared imaging system is carried out by means of Xilinx corporation's Field Programmable Gate Array (FPGA) according to spectral response characteristics of IR detectors and non-uniformity correction theory for two-point thermometric scale based on reference radiant point. This mean has the advantages of large dynamic range and fast processing speed. It is suitable for processing image at real-time in infrared imaging system.In the program of FPGA, assembly-line technique is used in both the design of the top level of the system and the design of the common adding and multiplying units of digital signal process. This will greatly improve the concurrent degree of the operation of the FPGA system.The design of hardware and software is emphasized in this paper. In the description of hardware, the function and circuit design of every units are discussed in detail. The diagrams of every unit are also listed. In the software part of the system, the modules from top to down are described in detail. In addition, the schematic or the important points of the VHDL program and the simulate waveform are proposed in this part. In this paper, the work about the enlargement of the system is also done properly by means of hardware and software.