Non-uniformity calibration and correction of reflector-based mosaic CCD camera

LI Xiao-jie; REN Jian-wei; LI Xiang-sheng; SUN Jing-xun; WAN Zhi; LIU Hong-xing

doi:10.3788/YJYXS20142906.1057

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Non-uniformity calibration and correction of reflector-based mosaic CCD camera

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- Non-uniformity calibration and correction of reflector-based mosaic CCD camera
- Chinese Journal of Liquid Crystals and Displays Vol. 29, Issue 6, Pages: 1057-1064(2014)
- 作者机构：
  
  1. 中国科学院长春光学精密机械与物理研究所, 吉林长春 130033
  2. 中国科学院大学, 北京 100049
- 作者简介：
- 基金信息：
- DOI：10.3788/YJYXS20142906.1057
  CLC： V248.1
- Received：06 March 2014，
  
  Revised：17 March 2014，
  
  Published：05 December 2014
- 稿件说明：
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李晓杰, 任建伟, 李宪圣, 孙景旭, 万志, 刘洪兴. 反射式拼接CCD相机非均匀性定标与校正[J]. 液晶与显示, 2014,29(6): 1057-1064

LI Xiao-jie, REN Jian-wei, LI Xiang-sheng, SUN Jing-xun, WAN Zhi, LIU Hong-xing. Non-uniformity calibration and correction of reflector-based mosaic CCD camera[J]. , 2014,29(6): 1057-1064
李晓杰, 任建伟, 李宪圣, 孙景旭, 万志, 刘洪兴. 反射式拼接CCD相机非均匀性定标与校正[J]. 液晶与显示, 2014,29(6): 1057-1064 DOI： 10.3788/YJYXS20142906.1057.

LI Xiao-jie, REN Jian-wei, LI Xiang-sheng, SUN Jing-xun, WAN Zhi, LIU Hong-xing. Non-uniformity calibration and correction of reflector-based mosaic CCD camera[J]. , 2014,29(6): 1057-1064 DOI： 10.3788/YJYXS20142906.1057.

摘要

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。

Abstract

According to the radiometric calibration experiments in laboratory

the reflector-based mosaic 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-uniformity. 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 relationship between each pixel's receiving irradiance and camera's incident radiance was built. Lastly

a correction 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 16%

and after correction

the values decreased to 1% or less. Besides

the correction factors were used to correct the images of outdoor experiments and it works very well.

关键词

Keywords

references

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School of Electronic and Information Engineering, Changchun University of Science and Technology, Changchun 130033, China,E-mail: Liuyy306@163.

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