多角度偏振成像仪杂散光校正方法研究
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摘要
多角度偏振成像仪是一种超广角画幅式的偏振成像传感器,杂散光是影响其辐射偏振测量精度的重要因素之一。为了避免杂散光影响高精度定量参数的反演,需要在实验室对其进行专门的分析、测量和校正。根据多角度偏振成像仪的光学系统特点,将影响仪器的杂光分为局部杂光和全局杂光,重点分析了这两种杂光的成因和表现特性,并以此为基础构建了仪器的杂散光模型,提出了通过分区域照明获取杂光系数矩阵并对待校图像进行分块校正的方法。在未饱和及过饱和两种情况下,通过分矩形区域、分视场二维转动扫描成像的方式,建立了目标区辐射量和其他非目标区杂光量的关系,最终获得11×11区域的杂散光系数矩阵。最后根据实测得到的杂散光系数矩阵对图像进行了校正,结果表明,此校正方法可以消除至少90%的杂散光。
The directional polarization camera is an ultra-wide-angle polarization imaging sensor,and stray light is one of the important factors that affect the radiation and polarization measurement precision.In order to avoid the influence of stray light on the inversion of high-precision quantitative parameters,special analysis,measurement and correction should be carried out in the laboratory.According to the characteristics of the optical system of the directional polarization camera,the stray light which affects the instrument is divided into local stray light and global stray light.The causes and performance characteristics of these two kinds of stray light are analyzed emphatically.On this basis,the stray light model of the instrument is constructed,and the method of obtaining the stray light coefficient matrix by partition of the illumination for correction the image is proposed.In the cases of unsaturation and supersaturation,by dividing the rectangular area and the two-dimensional rotation scanning imaging of the field of view,the relationship between the amount of radiation in the target area and the amount of scattered light in other non-target areas is established.Finally,the 11×11 regions of the stray light coefficient matrixes are obtained.The image is corrected according to the measured stray light coefficient matrixes.The results show that this correction method can eliminate at least 90% of stray light.
The directional polarization camera is an ultra-wide-angle polarization imaging sensor,and stray light is one of the important factors that affect the radiation and polarization measurement precision.In order to avoid the influence of stray light on the inversion of high-precision quantitative parameters,special analysis,measurement and correction should be carried out in the laboratory.According to the characteristics of the optical system of the directional polarization camera,the stray light which affects the instrument is divided into local stray light and global stray light.The causes and performance characteristics of these two kinds of stray light are analyzed emphatically.On this basis,the stray light model of the instrument is constructed,and the method of obtaining the stray light coefficient matrix by partition of the illumination for correction the image is proposed.In the cases of unsaturation and supersaturation,by dividing the rectangular area and the two-dimensional rotation scanning imaging of the field of view,the relationship between the amount of radiation in the target area and the amount of scattered light in other non-target areas is established.Finally,the 11×11 regions of the stray light coefficient matrixes are obtained.The image is corrected according to the measured stray light coefficient matrixes.The results show that this correction method can eliminate at least 90% of stray light.
引文
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[2]Yuan Yukai.Stray light suppressing measure of optical system[J].Journal of Atmospheric and Environmental Optics,2007,2(1):6-10.原育凯.光学系统杂散光的消除方法[J].大气与环境光学学报,2007,2(1):6-10.
[3]Cen Zhaofeng,Li Xiaotong,Zhu Qihua.Stray light analysis for optical system[J].Infrared and Laser Engineering,2007,36(3):300-304.岑兆丰,李晓彤,朱启华.光学系统杂散光分析[J].红外与激光工程,2007,36(3):300-304.
[4]Li Yan,Liu Jianfeng.Research on integrative suppression of internal and external stray light in infrared optical remote sensor[J].Acta Optica Sinica,2013,33(9):0928002.李岩,刘剑峰.红外光学遥感器内杂散光和外杂散光的综合抑制研究[J].光学学报,2013,33(9):0928002.
[5]Zhao Yuchen,Xu Yanjun,Sha Wei,et al.Stray light analyze and suppress of the space-borne infrared optical system[J].Chinese J Laser,2015,42(10):1016001.赵宇宸,许艳军,沙巍,等.天基红外成像光学系统杂散光分析与抑制[J].中国激光,2015,42(10):1016001.
[6]Iwasaki A,Oyama E.Correction of stray light and filter scratch blurring for ASTER imagery[J].IEEE Transactions on Geoscience and Remote Sensing,2005,43(12):2763-2768.
[7]Yuan Yukai,Li Xinyao,Pei Yuntian.Simulating first order stray light of FY-2VISSR using templates[J].Optics and Precision Engineering,2007,15(1):45-49.原育凯,李欣耀,裴云天.基于模板的FY-2一级杂散光模拟[J].光学精密工程,2007,15(1):45-49.
[8]Yan Ming,Wu Fei,Wang Zhiyong.Removal of SJ-9Aoptical imagery stray light stripe noise[J].Spacecraft Recovery&Remote Sensing,2014,35(5):72-80.严明,伍菲,王智勇.实践九号"A卫星光学遥感图像杂散光噪声去除[J].航天返回与遥感,2014,35(5):72-80.
[9]Hao Jiankun,Huang Wei,Liu Jun.Review of non-blind deconvolution image restoration based on spatially-varying PSF[J].Chinese Optics,2016,9(1):41-50.郝建坤,黄玮,刘军.空间变化PSF非盲去卷积图像复原法综述[J].中国光学,2016,9(1):41-50.
[10]Zong Y Q,Brown S W,Meister G,et al.Characterization and correction of stray light in optical instruments[C].SPIE,2007,6744:67441L.
[11]Zong Y Q,Brown S W,Johnson B C,et al.Correction of stray light in spectrographs:implications for remote sensing[C].SPIE,2005,5882:588201.
[12]Shang Yang,Han Jun.Correction of stray light of imaging spectrometer with grating dispersion[J].Foreign Electronic Measurement Technology,2012,31(2):43-46.尚杨,韩军.光栅型成像光谱仪杂散光校正技术研究[J].国外电子测量技术,2012,31(2):43-46.
[13]Zhang Junqiang,Wu Qingwen,Yan Changxiang.Measurement and correction of stray light of space-borne high resolution imaging spectrometer[J].Optics and Precision Engineering,2011,19(3):552-560.张军强,吴清文,颜昌翔.星载成像光谱仪杂散光测量与修正[J].光学精密工程,2011,19(3):552-560.
[14]Cui Yi,Wei Jun,Huang Xiaoxian.Image restoration of imaging spectrometer based on line spread function matrix[J].Infrared Technology,2014,36(2):115-119.崔毅,危峻,黄小仙.基于线扩散函数矩阵的成像光谱仪图像矫正方法[J].红外技术,2014,36(2):115-119.
[15]Zhang Tengfei,Huang Xiaoxian,Wei Jun,et al.Research on correction method of stray light in large field push-broom imaging spectrometer[J].Laser&Infrared,2016,46(11):1375-1378.张腾飞,黄小仙,危峻,等.宽视场推扫式成像光谱仪杂散光校正方法研究[J].激光与红外,2016,46(11):1375-1378.
[16]Laherrere J M,Poutier L,Bret-Dibat T,et al.POLDER on-ground stray light analysis,calibration,and correction[C].SPIE,1997,3221:132-140.
[17]Yang Weifeng,Hong Jin,Qiao Yanli.Optical design of spaceborne directional polarization camera[J].Acta Optica Sinica,2015,35(8):0822005.杨伟锋,洪津,乔延利.星载多角度偏振成像仪光学系统设计[J].光学学报,2015,35(8):0822005.
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[19]Yuan Yinlin,Xu Jun,Zhai Wenchao,et al.Design and test of a spectrally tunable integrating sphere reference light source with large exit aperture[J].Acta Optica Sinica,2013,33(7):0712004.袁银麟,徐骏,翟文超,等.大孔径可调光谱积分球参考光源研制和检测[J].光学学报,2013,33(7):0712004.
[20]Powell K,Chana D,Fish D,et al.Restoration and frequency analysis of smeared CCD images[J].Applied Optics,1999,38(8):1343-1347.
[21]Wang Chuanjin,Ye Binxun.Astronomical visible light detector[M].Beijing:China Science and Technology Press,2013:145.王传晋,叶彬浔.天文可见光探测器[M].北京:中国科学技术出版社,2013:145.