航天返回与遥感
航天返迴與遙感
항천반회여요감
SPACECRAFT RECOVERY & REMOTE SENSING
2014年
1期
91-96
,共6页
电荷耦合器件相机%辐射定标%校正残差%线性度%航天遥感
電荷耦閤器件相機%輻射定標%校正殘差%線性度%航天遙感
전하우합기건상궤%복사정표%교정잔차%선성도%항천요감
charge-coupled device camera%radiometric calibration%calibration error%linearity%space remote sensing
空间 CCD 相机对均匀景物响应的不一致在图像中表现为条带现象,相对辐射校正可以减弱或消除条带效应。相对辐射校正可以使用不同的算法,但效果不同。文章选取了某空间 CCD 相机的实验室辐射定标数据,采用基准的归一化系数法和最小二乘法,分别计算该相机的3组相对辐射校正系数,并对实验室原始辐射定标数据进行相对辐射校正,验证3种算法的校正效果。通过相对辐射校正后的图像和3种算法的辐射校正残余误差分析,认为以所有辐亮度DN(digital number)均值为基准的归一化系数法的校正效果在多数辐亮度级下好于最小二乘法。最后分析了相机像元响应线性度和算法辐射校正残余误差的关系。
空間 CCD 相機對均勻景物響應的不一緻在圖像中錶現為條帶現象,相對輻射校正可以減弱或消除條帶效應。相對輻射校正可以使用不同的算法,但效果不同。文章選取瞭某空間 CCD 相機的實驗室輻射定標數據,採用基準的歸一化繫數法和最小二乘法,分彆計算該相機的3組相對輻射校正繫數,併對實驗室原始輻射定標數據進行相對輻射校正,驗證3種算法的校正效果。通過相對輻射校正後的圖像和3種算法的輻射校正殘餘誤差分析,認為以所有輻亮度DN(digital number)均值為基準的歸一化繫數法的校正效果在多數輻亮度級下好于最小二乘法。最後分析瞭相機像元響應線性度和算法輻射校正殘餘誤差的關繫。
공간 CCD 상궤대균균경물향응적불일치재도상중표현위조대현상,상대복사교정가이감약혹소제조대효응。상대복사교정가이사용불동적산법,단효과불동。문장선취료모공간 CCD 상궤적실험실복사정표수거,채용기준적귀일화계수법화최소이승법,분별계산해상궤적3조상대복사교정계수,병대실험실원시복사정표수거진행상대복사교정,험증3충산법적교정효과。통과상대복사교정후적도상화3충산법적복사교정잔여오차분석,인위이소유복량도DN(digital number)균치위기준적귀일화계수법적교정효과재다수복량도급하호우최소이승법。최후분석료상궤상원향응선성도화산법복사교정잔여오차적관계。
Striping and banding in the image caused by the non-uniformity response of space charge-coupled device(CCD) camera can be corrected by relative radiometric calibration. There are different rela-tive radiometric calibration methods which have different effects. In this paper, three groups of relative calibration coefficient are obtained through the methods of least-square and two kinds of normalized coefficient procedure. The original images are corrected by using the coefficients to validate its calibration effect. The result of normal-ized coefficient method based on the mean DN of all radiance levels is better than that of least-square method at most of the radiance levels. The relationship between linearity and calibration error is analyzed at last.