Design Of Infrared Thermal Imaging System Based On FPGA

In recent years,the application of infrared imaging system is more and more extensive,and the infrared imaging technology has been greatly developed.With the development of infrared focal plane array,infrared imager has been extended from military application to civil and commercial use.Uncooled infrared imaging system with low cost,good system stability,low power consumption and small volume gradually occupies a dominant position in the infrared imaging system,has become a hot research direction of the current infrared imaging system.Infrared imaging system as a result of the limitation of material and manufacturing process,image quality is greatly limits,causing the application value of the original infrared images is not high,at the same time limit the subsequent development of applications,such as target recognition and target tracking,so the infrared image nonuniformity correction technology is an essential part of real-time infrared imaging system.In this paper,the development of infrared imaging system is investigated in detail,and a complete design of infrared imaging system is designed according to the requirements of the research group and the conditions of the laboratory.Imaging system includes hardware circuit design and software algorithm based on infrared imaging.For hardware circuit design to meet the requirements of system miniaturization and full functions,the hardware circuit of infrared imaging system includes driver circuit design of uncooled infrared focal plane array,detector temperature control circuit design,AD analog-digital conversion circuit design,FPGA as the core signal processing circuit and digital signal output circuit.The selected FPGA embedded ARM core can reduce the complexity of conventional infrared imaging circuit using multi-processor.Aiming at the non-uniformity of the pixel caused by the infrared focal plane array,the classical two-point method is adopted to correct it based on the real-time requirement of the system.For the dead element problem of infrared focal plane array,blind element replacement algorithm based on FPGA is used.And aiming at the problem of fringe noise caused by the difference of the readout circuit of the focal plane array,we propose two new fringe correction algorithms.After debugging the hardware and software of the system,the designed infrared imaging system can successfully achieve real-time imaging,and eliminate the non-uniformity of pixel,light,dark and fringe in the infrared image.Achieved the design requirements and the design objectives of the subject..