Study On Non-uniformity Correction Algorithm And Image Enhancing Algorithm On IRFPA

Infrared technology is a new invisible ray technology in the beginning of the 20th century and currently it is widely applied in the military and civilian field,such as infrared detecting,infrared stakeout and so on.Infrared focal plane plays a key role as the core of the infrared technology.Recently,as the manufacture technology of uncooled microbolometer infrared focal plane array got a great breakthrough,it made infrared system's weight more lighter,its volume more smaller and its price more cheaper.It does greatly accelerate the promotion of the infrared system to be applied in every aspect of the civilian field.The study of the infrared technology began relatively late in our country,so there is still large gap when compared with the developed countries.Therefore,it is urgent and meaningful to do the study.We all know that the non-uniformity in IRFPA(Infrared focal plane array) is widely discussed for the moment.Firstly,the paper plans to briefly introduce the development status of the infrared technology and some sorts of infrared imaging system in modern times.By the way,the paper also analyses the causes of non-uniformity in IRFPA,and studies the two sorts of the non-uniformity correction algorithms in IRFPA in the country.For example:the non-uniformity algorithm on the base of scaling and scene.On this basis,the paper brings forward an improved adaptive algorithm of NN(Neural Network).Secondly,the paper devises a suit of infrared image memory system that could put in two frame images on FPGA in order to run the adaptive algorithm of NN,and its main memory is DDR SDRAM which is owned by the development board.Finally the paper does detailed presentation of the characteristic of the infrared thermal imager that is often used by the lab.On the basis of the common image enhancing algorithm,when considering the requirements of our lab,the paper selects an algorithm that combines a linear enhancement algorithm and an adaptive calculation of the mean value algorithm,carries out the image enhancement processing with the output data from the thermal imager,and runs the algorithm on FPGA.The experiment indicates that all the schemes in the paper achieve the desired objectives.