一种基于定标的非均匀性校正改进算法  

An improved non-uniformity correction algorithm based on calibration

作　　者：王成龙 王春阳[1,3] 谷健[4] 赵新宇 WANG Cheng-long;WANG Chun-yang;GU Jian;Zhao Xin-yu(Changchun University of Science and Technology,Changchun 130022,China;Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences,Changchun 130033,China;Northwest Institutes of Advanced Technology,Xi’an Technological University,Xi’an 710072,China;63768Unit of PLA,Xi’an 713800,China)

机构地区：[1]长春理工大学,吉林长春130022 [2]中国科学院长春光学精密机械与物理研究所,吉林长春130033 [3]西安工业大学,西北兵器工业研究院,陕西西安710072 [4]中国人民解放军63768部队,陕西西安713800

出　　处：《中国光学》2022年第3期498-507,共10页Chinese Optics

基　　金：国防基础科研计划资助项目(No.JCKY-2016411C006)。

摘　　要：红外辐射测量系统的成像性能以及测量精度受到焦平面阵列非均匀性的严重影响,原始红外图像的非均匀性需通过后期图像处理算法进行校正。为进一步提高制冷型红外探测器的非均匀性校正(NUC)效果,本文提出了一种基于定标的非均匀性改进算法。该算法以单点定标和两点定标非均匀性校正方法为基础,既保留两点定标非均匀性校正方法增益校正系数的一致性优势,又结合了单点定标偏置校正系数的稳定性,使得改进算法具有更好的校正效果。为了验证该改进算法的校正效果,本文以640 pixel×512 pixel大小的制冷型中波红外探测器为研究对象,采用入瞳直径为25 mm的红外成像系统对提出的算法进行实验验证。实验结果表明:在1 ms积分时间下,单点定标方法、两点定标方法及改进算法校正后的图像非均匀性分别为1.7833%、0.2190%和0.1481%;2 ms积分时间下的非均匀性分别为1.8257%、2.2474%和1.6546%。改进算法整体上进一步降低了图像的非均匀性,校正效果更好、精度更高。The imaging performance and measurement accuracy of infrared radiation measurement systems are seriously affected by the non-uniformity of the focal plane array.Therefore,the non-uniformity of the raw infrared image needs to be corrected by the image processing algorithm.In order to further improve the NonUniformity Correction(NUC)effect of cooled infrared detectors,an improved non-uniformity algorithm based on calibration is proposed in this paper.The algorithm is based on the single-point calibration and the two-point calibration NUC methods,which not only retains the consistency advantage of the two-point calibration NUC method in gain correction coefficient,but also combines the stability of the single-point calibration in the offset correction coefficient.The improved algorithm has a better correction effect.In order to verify the correction effect of the improved algorithm,a cooled medium wave infrared detector with a size of640 pixel×512 pixel is taken as the research object,and an infrared imaging system with a pupil diameter of25 mm is used to verify the performance of the proposed algorithm.The experimental results show that under the 1ms integral time,the single-point calibration method,the two-point calibration method and the improved algorithm correct the image’s non-uniformity to 1.7833%,0.2190%and 0.1481%,respectively.And under the 2 ms integral time,they correct the image’s non-uniformity to 1.8257%,2.2474%and 1.6546%,respectively.The improved algorithm further reduces the image’s non-uniformity more effectively,so it’s correction effect is better and the accuracy is higher.

关 键 词：红外焦平面阵列 红外探测器 单点定标 两点定标 非均匀性校正 

分 类 号：TN215[电子电信—物理电子学]