Image defect of full-frame CCD  in TDI mode

LENG Xue; ZHANG Xue-fei; LI Wen-ming; SUN Cui-yu; CHEN Xi-hui

doi:10.3788/OPE.20142202.0467

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Image defect of full-frame CCD in TDI mode

Information Sciences | 更新时间：2020-08-13

- Image defect of full-frame CCD in TDI mode
- Optics and Precision Engineering Vol. 22, Issue 2, Pages: 467-473(2014)
- 作者机构：
  
  1. 长春理工大学,吉林长春,130022
  2. 中国科学院长春光学精密机械与物理研究所中国科学院航空光学成像与测量重点实验室,吉林长春,130033
  3. 华东交通大学土木建筑学院,江西南昌,330013
  4. 国家测绘局海岛礁测量重点实验室,山东青岛,266590
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20142202.0467
  CLC： V447.3
- Received：21 March 2013，
  
  Published：20 February 2014
- 稿件说明：
移动端阅览
冷雪,张雪菲,李文明等. 全帧CCD相机时间延迟积分模式下的图像缺损[J]. 光学精密工程, 2014,22(2): 467-473

LENG Xue,ZHANG Xue-fei,LI Wen-ming etc. Image defect of full-frame CCD in TDI mode[J]. Editorial Office of Optics and Precision Engineering, 2014,22(2): 467-473
冷雪,张雪菲,李文明等. 全帧CCD相机时间延迟积分模式下的图像缺损[J]. 光学精密工程, 2014,22(2): 467-473 DOI： 10.3788/OPE.20142202.0467.

LENG Xue,ZHANG Xue-fei,LI Wen-ming etc. Image defect of full-frame CCD in TDI mode[J]. Editorial Office of Optics and Precision Engineering, 2014,22(2): 467-473 DOI： 10.3788/OPE.20142202.0467.

摘要

长焦距面阵CCD相机以TDI模式进行动态横向多幅扫描成像时

行转移频率高或者曝光时间长会使图像输出有明显缺损

从而影响图像的判读。为解决这一问题

分析了全帧CCD相机TDI模式的工作原理

分析认为快门曝光过程中CCD存在的无效TDI转移是导致输出图像出现缺损的主要原因。通过实验验证了分析结果

并提出保证CCD曝光过程中TDI转移与机械快门曝光精确同步的方法来消除无效TDI转移。据此设计了光电同步定位法进行曝光控制

并研制了相应的快门光电同步装置。成像实验结果显示

该方法可将图像缺陷区域控制在15列像元内

解决了面阵CCD在TDI模式下输出图像的缺损问题

提高了图像判读精度。

Abstract

When a long focal area-array CCD camera takes photos in a TDI mode for dynamic lateral multi-frame imaging

it will output images with large size defect on the edge of image because of the high line transfer frequency or long exposure time and will influence image interpretation. To overcome the problems

the operating principle of area-array CCD in the TDI mode was analyzed

and the analysis indicates that the large size defect in the image comes from the invalid TDI transfer stages of the CCD during shutter exposure process. The obtained results were verified by a experiment and a method that the TDI transfer was finished simultaneously with shutter exposure was proposed to remove the invalid TDI transfer. On the basis of the analysis

a photo-electricity positioning synchronized was proposed and a photo-electricity synchronizer was developed to settle the headache. The results show that the image defect area is less than 15 column-pixels

which successfully solves the image defect from the area-array CCD camera in the TDI mode and improves its image interpretation accuracy.

关键词

Keywords

references

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