Hardware Design Of Uncooled Infrared Image Processing System Based On FPGA

After decades of development, the uncooled infrared thermal imaging system has been widely used in military and civilian affairs due to its low cost, low power, simple structure and small volume. Therefore,the research work of this thesis is of great practical significance.The general situation of domestic infrared imaging technique is analyzed first, and the basic principles of infrared imaging system, factors affecting image quality are discussed later. On this basis, a series of studies about hardware circuits and software processing algorithm are in progress aiming at the uncooled infrared detector of French ULIS company. Finally, the portable thermal imaging system of low cost and high imaging quality is achieved. The speeific work includes the fol lowing aspects:The whole hardware circuit is designed, including the IRFPA driving circuit, TEC temperature control circuit, signal processing circuit based on FPGA, A/D data acquisition circuit, D/A video conversion circuit and power circuit. The key image processing algorithm in infrared imaging system is analyzed and studied, including the temporal high-pass filter correction algorithm based on moving detection which is proposed based on the analysis of the two point non-uniformity correction algorithm, also including the commonly used blind pixel detection and compensation algorithm, and an improved threshold-based frame filtering algorithm which is proposed based on the study of the linear section gray scale transformation. Finally through experiment and testing, the ideal infrared image is obtained and the low cost and small volume demands are met.