Correction of seams for multiple output CCD
Correction of seams for multiple output CCD
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DOI：
10.3788/ope.20132102.0454
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
吴厚德 Wu Hou-de;许文海 Xu Wenhai
中科院分区：
文献类型：
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作者：
吴厚德 Wu Hou-de;许文海 Xu Wenhai
提出了一种基于时间延迟积分（TDI）概念的多路输出CCD图像拼接校正方法，在均匀光源照射下，利用TDI读出操作获取图像，建立了图像线平均灰度与曝光时间的关系模型，并在此基础上，利用该模型对多路输出CCD图像进行了拼接校正。通过对CCD输出响应的拟合和对输出非均匀性的校正，在模拟前端（AFE）的模拟域中实现了接缝校正，由于该校正方法只需要一幅图像，实验结果表明，该方法的输出不均匀度为2.482%，校正精度不受均匀光源照度调节精度的影响比两点法小，比多点法（16点）小1.052%，说明该方法校正效果好，实验工作量小，可广泛应用于多路输出CCD的接缝校正。
A new correction method based on the concept of Time Delay Integration(TDI) was proposed to eliminate the picture seams from a multiple output CCD.The TDI readout operation was used to capture the image under the illumination of a uniform light source,then a model to obtain the relationship between the line average gray level and the exposure time of the image was established.On the basis of the model,CCD output responses were fitted and the output non-uniformity was corrected.By the correction operations mentioned above,the seam correction was implemented in the analog domain of an Analog Front End(AFE).As only one image was needed for the correction method,the correction accuracy could not be affected by the illumination adjustment accuracy of uniform light source.Experiment results show that output non-uniformity by proposed method is 2.482% less than that of two-point method and 1.052% less than that of multi-point method(16 points),which means that the method has better correction effect,less experimental workload and can be widely used in the seam correction of multiple output CCDs.