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中国科学院 长春光学精密机械与物理研究所,吉林 长春,中国,130033
收稿日期:2013-02-23,
修回日期:2013-03-25,
网络出版日期:2013-08-20,
纸质出版日期:2013-08-15
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陶小平 罗霄 薛栋林. 地球静止轨道面阵凝视成像系统分时积分抑振技术[J]. 光学精密工程, 2013,21(8): 2169-2179
TAO Xiao-ping LUO Xiao XUE Dong-lin. Vibration suppression based on multiple integration for staring imaging system in geostationary orbit[J]. Editorial Office of Optics and Precision Engineering, 2013,21(8): 2169-2179
陶小平 罗霄 薛栋林. 地球静止轨道面阵凝视成像系统分时积分抑振技术[J]. 光学精密工程, 2013,21(8): 2169-2179 DOI: 10.3788/OPE.20132108.2169.
TAO Xiao-ping LUO Xiao XUE Dong-lin. Vibration suppression based on multiple integration for staring imaging system in geostationary orbit[J]. Editorial Office of Optics and Precision Engineering, 2013,21(8): 2169-2179 DOI: 10.3788/OPE.20132108.2169.
针对地球静止轨道卫星平台引起其面阵凝视成像系统的图像模糊,提出基于分时积分亚像元融合的方法来削弱平台颤振的影响,提高景物辨识度。设计并搭建了一维振动平台;利用高速图像采集系统采集不同曝光时间下不同频率振动的序列图像;使用基于能量区域质心法的相位相关法进行亚像元图像配准,计算每帧图像相对偏移量;与一维振动平台中的位移传感器数据进行对比,得到配准算法的精度优于0. 1 pixel。最后,对比长、短曝光图像清晰度的变化,选择短曝光序列图像中清晰度较高的图像完成亚像元融合,结果显示其融合图像清晰度更高,信噪比与长曝光图像相当。得到的结果验证了分时积分亚像元融合法对颤振模糊的抑制作用。
According to the image blurs caused by platform vibration in a staring imaging system in the geostationary orbit
a vibration suppression method based on multiple integration was proposed to eliminate the motion blur degradation and a 1D vibration platform was built. A high-speed CMOS image capturing system was used to collect image sequences with different vibration frequencies under different exposure conditions and a phase correlation method based on the energy area center was taken to match imagers in sub-pixels and calculate the relative deflection of each image. Finally
The sub-pixel displacements between the different frames estimated by image registration algorithm were compared with the motion data measured by the displacement sensor and the algorithm precision better than 0.1 pixels was obtained. Furthermore
the sharpnesses of long-exposure images and short-exposure images were compared
and several sharpest short-exposure frames were chosen for sub-pixel image fusion. The experiments indicate that the fusion imager shows better sharpness for a short-exposure frame and the motion blur in the fusion image has been weakened. It has proved that the method of multiple integration and sub-pixel image fusion is powerful of vibration suppression for staring imaging systems in the geostationary orbit.
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