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依据实验室辐射定标实验,校正反射式拼接 CCD 相机由渐晕现象引起的图像非均匀性。通过分析反射式拼接CCD 相机成像非均匀性产生机理,明确焦平面辐照度非均匀性是造成相机图像非均匀性的主要原因;分别进行“单片CCD 辐照度响应度定标”和“整机均匀性定标”实验;依据定标结果所得出的入射辐射亮度和在该亮度下每个像元实际接收到的辐射照度之间的关系,设计校正算法,得出每个像元的渐晕校正因子,实现渐晕图像非均匀性校正。校正结果显示:在一定入射辐射亮度范围内,原始积分球定标渐晕图像的非均匀性大于16%,用校正因子校正后,输出图像非均匀性下降到1%以内。经过非均匀性定标和校正的相机用于外场成像也取得了符合工程需要的满意效果。

According to the radiometric calibration experiments in laboratory,the reflector-based mo-saic CCD camera’s image non-uniformity caused by vignetting phenomenon was corrected.Firstly, the image un-uniformity reasons of reflector-based mosaic CCD camera are analyzed,and the irradiance deviation received by different CCD pixels in focal plane is the essential reason for images’non-uni-formity. Then, the CCD pixels ’ irradiance responsivity calibration experiment and the whole camera’s non-uniformity calibration experiment were carried out in the laboratory,and the relation-ship between each pixel’s receiving irradiance and camera’s incident radiance was built.Lastly,a cor-rection algorithm is put forward based on the above relationship to calculate CCD pixels’correction factors,and the correction factors were used to correct the vignetting image.The correct experiment indicates that,within a certain range of incident radiance,the non-uniformity of original calibration images are above 1 6%,and after correction,the values decreased to 1% or less.Besides,the correc-tion factors were used to correct the images of outdoor experiments and it works very well.

参考文献

[1] 沈宏海;黄猛;李嘉全.国外先进航空光电载荷的进展与关键技术分析[J].中国光学,20125(01):21-28.
[2] 郭疆;龚大鹏;朱磊.测绘相机焦平面 CCD 交错拼接中重叠像元数计算[J].光学精密工程,201321(05):1251-1258.
[3] 李朝辉;王肇勋;武克用.空间相机 CCD 焦平面的光学拼接[J].光学精密工程,20008(03):213-216.
[4] 朱瑞飞;王超;魏群.红外探测器非均匀性校正系统研制[J].红外与激光工程,201342(07):1669-1673.
[5] 任航.高分辨率大面阵 CCD 相机高帧频设计及其非均匀性的校正[J].红外与激光工程,201342(06):1491-1497.
[6] 李丙玉;王晓东;李哲.在轨完成 CCD 非均匀性校正的方法[J].液晶与显示,201126(02):255-259.
[7] 宁永慧;郭永飞.星上时间延迟积分 CCD 拼接相机图像的实时处理[J].光学精密工程,201422(02):508-517.
[8] 李宪圣;叶钊;任建伟.空间相机异常响应图像处理方法[J].液晶与显示,201227(04):557-561.
[9] 陶明慧;任建岳;张宇.反射镜拼接渐晕消除方法[J].光电工程,201138(06):45-49.
[10] 张宇;韩双丽;张珂.反射镜拼接相机渐晕消除方法[J].光机电信息,201128(06):23-29.
[11] Keller J B.Geometrical theory of diffraction[J].Optical Society of American,196252(02):116-130.
[12] 张宇;张立国;张星祥.行间转移大面阵 CCD 的 Smear 噪声实时去除[J].光学精密工程,201321(09):2389-2396.
[13] 罗通顶;李斌康;郭明安.科学级 CCD 远程图像采集系统[J].光学精密工程,201321(02):497-504.
[14] 任建伟;刘则洵;万志.离轴三反宽视场空间相机的辐射定标[J].光学精密工程,201018(07):1492-1499.
[15] 刘洪兴;任建伟;李宪圣.基于 Lighttools 的大口径积分球辐射特性仿真[J].红外与激光工程,201342(04):960-965.
[16] 宁永慧;郭永飞.TDI CCD 拼接相机的像元响应非均匀性校正方法[J].中国光学,20136(03):386-393.
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