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时间:2019-02-04
《数字天顶摄像仪中ccd星像亚像素定位的改进二维矩方法》由会员上传分享,免费在线阅读,更多相关内容在工程资料-天天文库。
1、第40卷第6期测绘学报Vol.40,No.62011年12月ActaGeodaeticaetCartographicaSinicaDec.,2011文章编号:1001-1595(2011)06-0679-05数字天顶摄像仪中CCD星像亚像素定位的改进二维矩方法郭金运1,2,3,宋来勇1,2,刘新1,2,卢秀山1,2,阳凡林1,21.山东科技大学测绘学院,山东青岛266510;2.海岛(礁)测绘技术国家测绘地理信息局重点实验室,山东青岛266510;3.中国科学院国家天文台,北京100012ImprovedTwo-dimensionalMomentMethodofP
2、ositioningSub-pixelofCCDStarImagefromDigitalZenithCamera1,2,3,SONGLaiyong1,2,LIUXin1,2,LUXiushan1,2,YANGFanlin1,2GUOJinyun1.CollegeofGeodesyandGeomatics,ShandongUniversityofScienceandTechnology,Qingdao266510,China;2.KeyLaboratoryofSurveyingandMappingTechnologyonIslandandReef,NationalA
3、dministrationofSurveying,MappingandGeoinformation,Qingdao266510,China;3.NationalAstronomicalObservatories,ChineseAcademyofSciences,Beijing100012,ChinaAbstract:Precisestar-centroiddeterminationofdigitalstarimagescreenedwithCCDisimportanttoestimatethepreciseastronomicallocationofobservi
4、ngstationinthesurveyingofverticaldeflectionbasedonGPSandCCDtechniqueswiththeastro-geodeticmethod.Thesub-pixelcenterofCCDstarimageshouldpreciselybepositionedtoimprovetheprecisionofstationastronomicallatitudeandlongitudewiththedigitalzenithcamera.AprogramisdevelopedwithMATLABtoreadCCDim
5、ageinFITSformat.Starimageswithdifferentmagnitudescanautomaticallybefoundwithanadaptiverectangletemplatemodel.BasedontheanalysisofCCDstarimage,thetwo-dimensionalmomentmethodisimprovedtoprocessrealCCDstarimages.Thethresholdvalueselectedinthemomentmethodincommonusecanseriouslyaffectthepo
6、sitioningprecisionsofstarimageswithdifferentbrightness.Soaniterativemethodtocalculatetheoptimalthresholdisputforward.Comparedwiththetwo-dimensionalmodifiedmomentmethod,theimprovedtwo-dimensionalmomentmethodisofmoreefficiency,precisionandreliability.Moreprecisepositioningresultsfordark
7、starsareacquiredwiththeimprovedmethodandthepositioningprecisionfordarkstarsisupto0.1~0.15pixel.Keywords:CCDstarimage;sub-pixelpositioning;automaticinvestigation;two-dimensionalmomentmethod;threshold摘要:在利用数字天顶摄像仪通过天文测量确定天文垂线偏差的工作中,要求对CCD数字图像中星像中心进行亚像素定位。利用MATLAB实现对FITS格式CCD天文图像的正确读取,利用
8、矩形模板实
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