改进的探测器S形曲线的非均匀校正算法研究  

Improved Deteclor Nonuniformity Correction Based on S-curve Model

作　　者：赵岩[1] 张焱[1] 沈振康[1] 

机构地区：[1]国防科学技术大学电子科学与工程学院,湖南长沙410073

出　　处：《激光与红外》2008年第3期226-229,共4页Laser & Infrared

基　　金：武器装备预研基金(No.9140A01030406KG01)项目资助

摘　　要：在大动态范围内,基于光子效应的IRFPA探测器单元的响应输出与入射辐照度之间为非线性关系。由理论分析各测量结果可知,探测器的响应曲线服从S形非线性分布。然而经典S形曲线校正算法计算量大,而且参数随时间漂移,工作一段时间后需重新定标,这样必然影响热像仪的连续工作,并且增大了硬件实现的难度。针对这两个问题提出了改进的S形曲线校正算法。该算法结合两点校正算法,减少了计算量,并利用最小均方法(LMS)对S形曲线的定标参数进行补偿,解决了探测器需要重新定标的问题,实现了基于LMS的S形两点定标校正算法。并通过实验,表明提出的改进算法计算量小,校正精度较高,而且解决了经典S形曲线校正算法需多次定标的问题,具有较好的工程实践意义。The relation between response output and radiate input of the detectors of the IRFPA is nonlinearity in big dynamical range. Due to the result of the experiment, we knew that the response curve of the detector obeys S-curve model. However, the traditional S-curve model correction needs great deal of calculate. And the parameters drift as time goes by. The parameters need to be compensated which may affect the continuous working of the infrared detectors and at the same time makes the system complex. New method combined with two-point NUC correction,which reduced calculate a lot. Based on least mean square （LMS） algorithm,the parameters of the S-curve model is compensated to solve the problem of the traditional method in this paper. And the new improved algorithm is realized. Its efficiency and superiority are clarified by experiment. The algorithm has better engineering practice significance.

关 键 词：非均匀校正 两点定标线性校正法 最小均方法 S形曲线 

分 类 号：TP391[自动化与计算机技术—计算机应用技术] TN215[自动化与计算机技术—计算机科学与技术]