IRFPA Detector's Algorithm And Simulation In Nonuniformity Correction

This paper make a deep research in nonuniformity correction of IRFPA detector, according to treating with the information in infrared imaging systems . The causations and features of nonuniformity in infrared imaging systems are described. Researches on several methods of NUC are made respectively. a new way for NUC on the basis detector's response nonlinearity is used. Based on the simulation results, the algorithm behave more satisfyingly. The unitary BP algorithm is introduced, which has more adaptability than classical BP algorithm. The unitary BP algorithm's effectiveness and superiority were verified by simulation .To avoid the disadvantage of the traditional spatial adaptive nonunifonnity correction denoising the low frequency dominated nonunifonnity noise,a new way is used .Simulation show that the proposed scheme can achieve good performance when low frequency noise is dominant .There are five chapters in this paper.the main work can be summarized as follows:In chapterⅠ, the technology of IRFPA's for NUC is described in the first part of this paper.In chapterⅡ, the causations and features of nonuniformity in infrared imaging systems are described .Researches on several methods of NUC are made respectively.In chapterⅢ, a way for NUC on the basis detector's response nonlinearity is used. Through analysis on the data obtained from simulation, the"S curve"and its arithmetic model are found, based on the simulation results, the algorithm takes the detector's natural essence into account so can behave more satisfyingly.In chapterⅣ,the unitary BP algorithm is introduced, which has more adaptability than classical BP algorithm.Simulation were performed.The unitary BP algorithm's effectiveness and superiority were verified by simulation .when low frequency noise is dominant ,a new way for NUC is used .Simulation show that the scheme can achieve good performance .In chapterⅤ, simulations on several methods of NUC are made respectively with really IR image several methods of nonuniformity correction (NUC) for FPA are analyzed and compared in detail.