基于局部恒定统计的高精度联合非均匀性校正方法
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摘要
为校正长波红外探测器辐射响应非均匀性,抑制非线性和随时间漂移,提出了一种基于分段两点校正法和局部恒定统计的校正方法.首先,对非均匀性噪声建模,利用分段两点校正法进行粗校正;其次,利用绝对偏差中值法剔除异常像素,并迭代累加得到均值图像;最后,对均值图像滤波,求得校正系数矩阵并对图像精校正.搭建了原理样机,进行了两次实验室标定实验和一次外场实验.实验结果表明:本文方法可以将黑体图像标准差从2.75降低至2.26,将外场图像粗糙度从1.47×10-2降低至1.03×10-2.本文方法复杂度低、鲁棒性强、精度高,可以有效去除非均匀性噪声.
To correct the nonuniformity of long-wave infrared detectors and suppress the nonlinearity and time drift,a combined nonuniformity correction method based on piece-wise two-point correction method and local constant statistics was proposed.Firstly,on the basis of the modeling of nonuniform noise,a piece-wise two-point correction method is performed as a coarse correction step.Then,abnormal pixels are kicked out with the median absolute deviation method,and the mean image is calculated through multiple frames in an iterative manner.Finally,the mean image is filtered to obtain the correction matrix for the fine correction step.Two laboratory calibration experiments and one outfield experiment are performed with a principle prototype.Experimental results demonstrate that the standard deviation of the blackbody can be decreased from 2.75 to 2.26,and the roughness of the outfield scenes from 1.47×10-2 to 1.03×10-2.The proposed method has the characteristic of low complexity,strong robustness,and high precision,and is able to reduce nonuniformity noise effectively.
To correct the nonuniformity of long-wave infrared detectors and suppress the nonlinearity and time drift,a combined nonuniformity correction method based on piece-wise two-point correction method and local constant statistics was proposed.Firstly,on the basis of the modeling of nonuniform noise,a piece-wise two-point correction method is performed as a coarse correction step.Then,abnormal pixels are kicked out with the median absolute deviation method,and the mean image is calculated through multiple frames in an iterative manner.Finally,the mean image is filtered to obtain the correction matrix for the fine correction step.Two laboratory calibration experiments and one outfield experiment are performed with a principle prototype.Experimental results demonstrate that the standard deviation of the blackbody can be decreased from 2.75 to 2.26,and the roughness of the outfield scenes from 1.47×10-2 to 1.03×10-2.The proposed method has the characteristic of low complexity,strong robustness,and high precision,and is able to reduce nonuniformity noise effectively.
引文
[1] ZHOU Yong-kang,ZHU You-pan,ZHAO De-li.A review of scene-based nonuniformity correction algorithms for infrared focal plane arrays[J].Infrared Technology,2018,40(10):952-960.周永康,朱尤攀,赵德利.基于场景的红外焦平面非均匀校正算法综述[J].红外技术,2018,40(10):952-960.
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[14] LIU Gao-rui,SUN Sheng-li,LIN Chang-qing,et al.Analysis and suppression method of flickering pixel noise in images of infrared linear detector[J].Journal of Infrared and Millimeter Waves,2018,37(4):421-426+432.刘高睿,孙胜利,林长青,等.红外线列探测器闪元噪声分析与抑制方法[J].红外与毫米波学报,2018,37(4):421-426+432.
[15] CHEN Jian-jun,CUI Ji-cheng,LIU Jia-nan,et al.Research on correction technology of HgCdTe short-wave IRFPA[J].Acta Optical Sinica,2018,39(2):0204001.陈建军,崔继承,刘嘉楠,等.HgCdTe短波红外焦平面探测器校正技术的研究[J].光学学报,2018,39(2):0204001.
[16] GB/T B584-2011,红外探测器参数测试方法[S].
[17] HAYAT M M,TORRES S N,ARMSTRONG E,et al.Statistical algorithm for nonuniformity correction in focalplane arrays[J].Applied Optics,1999,38(5):772-780.
[2] ZHANG Shuang,ZHOU Hui-xin,NIU Xiao-xue,et al.Temporal high-pass filter nonuniformity correction algorithm based on non-local means filter for infrared focal plane array[J].Acta Photonica Sinica,2014,43(1):147-150.张爽,周慧鑫,牛肖雪,等.基于非局部均值滤波与时域高通滤波的非均匀性校正算法[J].光子学报,2014,43(1):147-150.
[3] CUI Kun,CHEN Fan-sheng,SHEN Xiao-feng,et al.Improved adaptive segmentation non-uniformity correction method for IRFPA[J].Infrared Technology,2017,39(3):209-213.崔坤,陈凡胜,苏晓锋,等.改进型自适应分段的红外焦平面非均匀校正方法[J].红外技术,2017,39(3):209-213.
[4] MENG Si-qi,REN Kan,LU Dong-ming,et al.A non-uniformity correction algorithm of infrared image sequences based on constant-statistics[J].Journal of Applied Optics,2017,38(2):304-308.孟思岐,任侃,路东明,等.一种基于恒定统计的红外图像非均匀性校正算法[J].应用光学,2017,38(2):304-308.
[5] LIU Ya-mei.Nonuniformity correction method based on statistical consistency of adjacent pixels[J].Acta Photonica Sinica,2018,42(7):0710002.刘亚梅.基于相邻像素统计一致性的非均匀性校正方法[J].光子学报,2018,42(7):0710002.
[6] LI Cheng-li,LJun-wei,LIU Liang,et al.Nonuniformity correction algorithm based on image registration[J].Laser and Infrared,2018,48(4):531-536.李成立,吕俊伟,刘亮,等.基于图像配准的非均匀性校正算法[J].激光与红外,2018,48(4):531-536.
[7] LIU N,QIU H.A time-domain projection-based registration-scene-based nonuniformity correction technology and its detailed hardware realization[J].Optical Review,2014,21(1):17-26.
[8] HE Z,CAO Y,DONG Y,et al.Single-image-based nonuniformity correction of uncooled long-wave infrared detectors:a deep-learning approach[J].Applied Optics,2018,57(18):155-164.
[9] KUANG X,SUI X,CHEN Q,et al.Single infrared image stripe noise removal using deep convolutional networks[J].IEEE Photonics Journal,2017,9(4):3900913.
[10] YANG Hong-fei,XIA Hui,MA Bei,et al.Non-uniformity correction of infrared digital TDI imaging[J].Journal of Image and Graphics,2018,23(3):458-465.杨洪飞,夏晖,马贝,等.红外数字TDI成像非均匀性校正[J].中国图象图形学报,2018,23(3):458-465.
[11] YU Pin-yi.Application of multi-point nonuniformity correction method[J].Infrared and Laser Engineering,2008,37(s2):615-618.郁品一.多点定标非均匀性校正方法的综合应用[J].红外与激光工程,2008,37(s2):615-618.
[12] ROUSSEEUW P J,CROUX C.Alternatives to the median absolute deviation[J].Publications of the American Statistical Association,1993,88(424):1273-1283.
[13] CHEN Chun-lei,YE Dong-yi,CHEN Zhao-jiong.Blind image deblurring via multi-local kernels’fusion[J].Acta Photonica Sinica,2018,47(10):1010002.陈春雷,叶东毅,陈昭炯.多局部模糊核融合的图像盲去模糊算法[J].光子学报,2018,47(10):1010002.
[14] LIU Gao-rui,SUN Sheng-li,LIN Chang-qing,et al.Analysis and suppression method of flickering pixel noise in images of infrared linear detector[J].Journal of Infrared and Millimeter Waves,2018,37(4):421-426+432.刘高睿,孙胜利,林长青,等.红外线列探测器闪元噪声分析与抑制方法[J].红外与毫米波学报,2018,37(4):421-426+432.
[15] CHEN Jian-jun,CUI Ji-cheng,LIU Jia-nan,et al.Research on correction technology of HgCdTe short-wave IRFPA[J].Acta Optical Sinica,2018,39(2):0204001.陈建军,崔继承,刘嘉楠,等.HgCdTe短波红外焦平面探测器校正技术的研究[J].光学学报,2018,39(2):0204001.
[16] GB/T B584-2011,红外探测器参数测试方法[S].
[17] HAYAT M M,TORRES S N,ARMSTRONG E,et al.Statistical algorithm for nonuniformity correction in focalplane arrays[J].Applied Optics,1999,38(5):772-780.